For building owners, facilities and portfolio managers, and commercial roofing contractors

Restoration is a maintenance programme, not a cheaper roof

Low-slope · commercial and industrial

A liquid-applied coating over a sound, adhered membrane with dry insulation under it can genuinely buy years. Over wet insulation it buys a sealed-in problem and a warranty argument.

30-second answer

Should we restore this roof with a coating instead of replacing it?

Restoration is legitimate on a roof whose membrane is intact and adhered and whose insulation is dry. A coating adds film above the membrane and nothing below it — no drainage, no structure, no dry insulation. So the moisture survey comes before the proposal, and the recoat cycle belongs in the budget. Priced as a one-time purchase, restoration is deferred replacement.

Safety first

Everything on this page happens on a work surface, not a viewing platform

The moisture survey, the core cuts, the adhesion test patch, the pressure wash and the coating itself all put people on a low-slope roof. That is occupational work. Under OSHA’s general industry walking-working surfaces rule, an employee on a surface with an unprotected side or edge four feet or more above a lower level must be protected from falling (29 CFR 1910.28(b)(1)(i)), and low-slope roof work carries its own duties keyed to distance from the edge — under six feet, six to fifteen feet, and fifteen feet or more (1910.28(b)(13)). Construction work is governed separately.

A washed roof is slippery, a cured silicone film is slippery when wet, and the wash-down runs cleaning solution across a roof that usually has energised mechanical equipment, condensate lines and gas piping on it. None of that is a reason to avoid restoration. It is a reason the survey and the work belong to people whose job it is.

Send a contractor with a written fall-protection plan, not a facilities staffer with a phone camera. Confirm that rooftop electrical and gas-fired equipment is isolated before anyone starts a wash-down, and keep the safety data sheets for the cleaners and solvents on site.

Learning paths and saved lessons

At a glance

The short versionSection link

Six facts that decide most restoration conversations before the chemistry is discussed.

What a roof coating is: A fluid-applied film, not a roofModel IBC defines a roof coating as a fluid-applied, adhered coating used for roof maintenance or roof repair, or as a component of a roof covering system or roof assembly. Read as model text; your adopted edition governs.
The governing precondition: A moisture survey, verified by coresInfrared (ASTM C1153), nuclear (ANSI/SPRI/IIBEC NT-1) and electrical impedance (ASTM D7954) each infer moisture from something else. All three are confirmed by cutting and oven-drying cores.
What restoration does not add: Slope, drainage, structure, insulation, attachmentThe film lands above the membrane. Nothing below the membrane changes, including the reasons most low-slope roofs actually fail.
Code standing: Its own section, plus a layer-count exceptionModel IBC gives roof coatings a dedicated section with a materials table, and a new protective coating over an existing coating or covering is not counted as another roof-covering layer. Adopted edition, local amendments and the AHJ govern.
The obligation you are buying: A recoat cycle, for as long as you hold the buildingA proposal that prices one application and stops has priced half the decision. The maintenance requirement in the warranty is the other half.
Where it is plainly wrong: Wet insulation, failed adhesion, standing waterModel IBC does not permit a roof recover where the existing roof or roof covering is water-soaked or has deteriorated to the point that it is not an adequate base for additional roofing.

Tradeoffs

This page’s position — restoration is real, and it is oversold — and where that position is wrongSection link

The argument here is that restoration should be gated on evidence about the existing roof rather than on the price difference. That is usually right. The cases where it is not are real ones.

Best when

The membrane is continuous and adhered, the seams pass a probe, and a moisture survey verified by cores shows the insulation is dry.
The building has years of ownership left but not this year’s capital, and the roof is genuinely sound enough to reach the funded year rather than merely expected to be.
Disruption is the dominant cost: no tear-off, no open roof over a running operation, no crane in the yard, no disposal tonnage, no interior protection.
The roof already drains. Restoration preserves whatever slope it finds and contributes none of its own.
Somebody owns the recoat cycle — a named budget line, an inspection cadence, and a maintenance record good enough to answer a warranty administrator.
The roof is a spray polyurethane foam or metal panel roof, where recoating is the designed maintenance regime rather than a substitute for replacement.

Think twice if

No survey has been done, or one was done and never verified with cores. An infrared image without a core cut is a temperature map, not a moisture finding.
The proposal treats the coating as the repair. Coating over an open seam, a split base flashing or a failed termination bar re-covers a defect rather than correcting it.
The roof ponds. Water that stood before the coating stands on the coating, and every ponding-related exclusion in the warranty is waiting there.
The insulation is well below what an energy code would require on a replacement. Restoration forgoes an upgrade that a tear-off would have forced, and it forgoes it for the whole extended life.
The building will be sold or refinanced inside the recoat horizon. The next owner inherits both the cycle and the chemistry lock-in.
The pitch leads with tax treatment rather than roof condition. How an expenditure is treated is a question for your accountant about your facts, not a property of the product.
Two coating proposals differ materially in price and nobody can say why. The usual answer is dry film thickness, and the usual place it is hidden is the coverage rate.

What changes the answer

The core-cut results: how much of the field was flagged, how much was verified wet, and where the wet areas sit relative to drains and curbs.
Adhesion. A test patch on a prepared, representative area is cheap, and it settles an argument that is otherwise unsettleable from a data sheet.
The chemistry already on the roof, and the chemistry going on it. A silicone manufacturer’s own instructions state what may be applied over its cured film, and the answer is silicone.
The remaining ownership horizon set against the recoat interval in the manufacturer’s written maintenance requirement.
What the authority having jurisdiction calls the work. Maintenance, repair, recover and replacement are four different words in an adopted code, and they carry different obligations.
Whether the roof assembly’s fire classification listing includes the coating, or merely tolerated it.

The mechanism

A coating is a film. The roof is everything under it.Section link

Almost every argument about restoration is really an argument about one horizontal line: the top of the existing membrane. Work above it is what a coating does. Work below it is what a coating cannot do.

Section through a low-slope roof after restoration, with the layers separated so each can be named. The heavy dashed line is the limit of the work. The hatched zone is wet insulation, which the film seals in rather than dries out.Original diagram, Understanding Roofing.

New coating film. Measured in mils of dry film thickness, applied in coats, and consumed by weather from the day it cures. See mil.
Existing membrane. The substrate. Adhesion to this surface, after cleaning, is the whole technical question.
Cover board. Unchanged, including any board that has already gone soft under a long-standing leak.
Insulation. Unchanged in thickness, in composition, and in R-value. A restoration is not an energy upgrade.
Vapor retarder. Unchanged, and now with a lower-permeance film added above it — which matters if the assembly was already trying to dry upward.
Steel deck. Unchanged, and still carrying whatever load the roof puts on it.
Ponded water. A coating follows the slope it finds. Water that stood before stands after, on a newer surface.
Wet insulation. The hatched zone. It does not dry under a new film; it is sealed under one.

What restoration genuinely buys

On the right roof, this is not a consolation prize. A continuous liquid film has no laps of its own, so the seams a membrane roof is assembled from are no longer the outermost line of defence. It goes on monolithically across the field and up onto curbs, drains and base flashings — the details that have to be made one at a time in a sheet system. And it is sacrificial: the film takes the ultraviolet exposure and thermal cycling that would otherwise fall on the membrane, and a reflective one runs cooler while it does. It is installed with rollers and spray equipment rather than a tear-off crew, so a tenant keeps working, a warehouse keeps shipping, and the disposal line on the budget disappears.

And on a spray polyurethane foam roof or a metal panel roof, a recoat is not restoration in the marketing sense at all — it is the designed maintenance of a system that was always going to need its protective surface renewed. NRCA groups exactly those substrates together in its applicator guidance: single-ply membranes, built-up roofing, polymer-modified bitumen, spray polyurethane foam and metal panel roof systems.

Why the moisture survey is the entire decision

Wet insulation is not a defect a coating can outlast. It conducts heat where it should resist it, it holds the water against the deck, it corrodes steel from the top surface where nobody looks, and it weighs something. Nothing in a coating dries it. On most low-slope assemblies the membrane above the insulation was already close to impermeable, so there was never much upward drying to lose; where the old surface still let something through — splits, open laps, a weathered bituminous surfacing — a new film closes that too, and the water stays where it is.

This is also where the code stops being neutral. Model IBC does not permit a roof recover where the existing roof or roof covering is water-soaked or has deteriorated to the point that it is not an adequate base for additional roofing. Writing in NRCA’s Professional Roofing, Matt Dupuis put the trade position more bluntly still: current industry guidelines, building codes and common good roofing practice require that a moisture-laden roof not be recovered.

Three ways to find water, none of which finds water

A moisture survey is an inference, and each method infers from a different proxy.

Infrared. ASTM C1153 covers night-time thermal imaging of roofs with insulation above the deck in contact with the waterproofing. Wet insulation has more thermal mass, so it releases heat more slowly after sunset and reads warmer. The imager sees temperature, not moisture — which is why the practice explicitly addresses verification of infrared data using invasive test methods. Anything else warm on that roof at night reads warm too.
Nuclear. ANSI/SPRI/IIBEC NT-1 covers detection and location of latent moisture by nuclear radioisotopic thermalization: fast neutrons are slowed by collision with hydrogen nuclei, and water is where the hydrogen is. It is also where any other hydrogen is, which is why the readings are relative and are quantified against cores.
Electrical impedance, sometimes sold as capacitance. ASTM D7954 covers non-destructive impedance scanning of roofing and waterproofing systems to locate moisture and evaluate comparative moisture content, and the practice addresses verification of impedance data by invasive procedures using core samples. Comparative is the operative word.

All three end in the same place: core cuts, dried in a laboratory oven and weighed. IIBEC’s technical advisory on reusing roof insulation names the same three non-destructive methods and states that all of them require confirming findings by extraction of roof core samples. Skipping that step does not only risk coating a wet roof; it also condemns dry roofs. Michael Williams, writing in Professional Roofing, describes meters used without the applicable standards producing false positives and the unnecessary removal of sound roofing that follows.

The number that should end the “it is not that wet” argument

There is an old industry threshold called the R80 rule, attributed to the researcher Wayne Tobiasson: insulation was considered wet and in need of replacement once it had lost twenty per cent of its thermal resistance. Dupuis makes the arithmetic visible. Polyisocyanurate would have to reach a moisture content of roughly 262 per cent by weight to hit its R80 point. Its facers, the cover board above it, the adhesive bond and the steel deck below it all fail long before that. So a contractor who tells you the survey found moisture but not enough to matter is applying a threshold that stopped describing modern roof assemblies some time ago.

Preparation is not preparation for the job. It is the job.

Adhesion is the property everything else depends on, and it is a property of the interface, not of the can. One silicone manufacturer’s published application instructions — product specific, and quoted here as an example of what a real instruction requires rather than as a rule for any other product — open with the line that it is extremely important to get the roof clean and dry, require repair of open seams, tears and cuts before washing so water is not driven under the membrane, prescribe power scrubbing and rinsing until the suds are gone, treat algae and mildew separately, and then insist the surface is examined to confirm residual water has actually dried before any coating goes on. On primer, the same document says an adhesion test should be performed on a properly prepared and representative area of the substrate to be coated.

That test patch is the cheapest risk transfer available on this whole decision. It costs a morning. It answers a question that no data sheet, no warranty and no reference list can answer about your specific weathered, chalked, previously-coated, contaminated roof.

The recoat obligation

A coating is applied at a stated coverage rate, usually in two coats, and the resulting dry film thickness is what you actually bought. The same manufacturer’s instructions call for two gallons per 100 square feet across two coats and warn that coverage drops on heavily textured or weathered substrates — so a proposal quoting fewer gallons over a rough roof is quoting a thinner roof. That film then weathers. Renewing it is not an optional upgrade at some future date; it is the condition on which the extended service life, and usually the warranty, depends.

Chemistry decides how free you are when that date arrives. The silicone instructions quoted above end with a flat prohibition: do not recoat that product with acrylic, urethane or Hypalon coatings. Read that as an owner rather than as an applicator and it says something larger. The first coating choice narrows every subsequent one, for as long as the film stays on the roof.

The decision

The six gates a restoration has to passSection link

Restoration is not a judgement call about a roof’s general condition. It is six specific questions, each with an evidence standard and each with a defined failure route. A proposal that cannot answer all six is not yet a proposal.

The restoration gate: six conditions, the evidence that settles each, and what a failed gate actually means. Compiled by Understanding Roofing from the sources listed at the foot of this page.
Gate	What settles it	Evidence to require	If it fails
1. Is the insulation dry?	A moisture survey by infrared, nuclear or electrical impedance, confirmed by core cuts dried and weighed in a laboratory.	The survey report with method and standard named, a plan drawing with core locations marked, and gravimetric results per core.	Cut out and replace the wet areas before coating. If they are diffuse rather than bounded, restoration is the wrong instrument and the roof needs tear-off.
2. Is the membrane still a membrane?	A physical survey: seam probing, flashing and termination condition, punctures, splits, and the condition of the cover board under any long-standing leak.	A condition report that separates defects to be repaired from field surface to be coated, with quantities against each.	Repair first and price it separately. A coating over an open seam or a split base flashing re-covers a defect and buys nothing.
3. Does the roof drain?	Where water stands after rain, how long it stands, and whether drains and overflows are clear, correctly located and set at the low point.	Ponding mapped on the same plan drawing as the moisture survey, plus drain and scupper condition.	Correct the drainage first, as a design exercise. A coating adds no slope, and ponding exclusions in the warranty are waiting where the water is.
4. Will the coating stick?	Adhesion to this substrate after this preparation — not adhesion in a manufacturer’s laboratory to a clean coupon.	A test patch on a prepared, representative area, with the result written down, and the primer decision that follows from it.	Change the preparation, change the primer, or change the product. Adhesion is the property everything downstream depends on.
5. What does the jurisdiction call this work?	The adopted code edition, its local amendments, and whether the AHJ classifies the work as maintenance, repair or a roof recover.	A written answer from the AHJ, and confirmation of whether a permit and inspection apply.	Re-scope to what the jurisdiction actually permits. The model code’s layer-count exception for coatings is not a nationwide rule.
6. Who owns the recoat cycle?	The manufacturer’s written maintenance requirement, the recoat interval, and whether your ownership horizon reaches it.	The recoat in the capital plan with a date and a number, plus the inspection cadence the warranty conditions require.	Price replacement instead. An unfunded recoat turns a restoration into a shorter, more expensive roof.

Read this table one item at a time

1. Is the insulation dry?

What settles it: A moisture survey by infrared, nuclear or electrical impedance, confirmed by core cuts dried and weighed in a laboratory.
Evidence to require: The survey report with method and standard named, a plan drawing with core locations marked, and gravimetric results per core.
If it fails: Cut out and replace the wet areas before coating. If they are diffuse rather than bounded, restoration is the wrong instrument and the roof needs tear-off.

2. Is the membrane still a membrane?

What settles it: A physical survey: seam probing, flashing and termination condition, punctures, splits, and the condition of the cover board under any long-standing leak.
Evidence to require: A condition report that separates defects to be repaired from field surface to be coated, with quantities against each.
If it fails: Repair first and price it separately. A coating over an open seam or a split base flashing re-covers a defect and buys nothing.

3. Does the roof drain?

What settles it: Where water stands after rain, how long it stands, and whether drains and overflows are clear, correctly located and set at the low point.
Evidence to require: Ponding mapped on the same plan drawing as the moisture survey, plus drain and scupper condition.
If it fails: Correct the drainage first, as a design exercise. A coating adds no slope, and ponding exclusions in the warranty are waiting where the water is.

4. Will the coating stick?

What settles it: Adhesion to this substrate after this preparation — not adhesion in a manufacturer’s laboratory to a clean coupon.
Evidence to require: A test patch on a prepared, representative area, with the result written down, and the primer decision that follows from it.
If it fails: Change the preparation, change the primer, or change the product. Adhesion is the property everything downstream depends on.

5. What does the jurisdiction call this work?

What settles it: The adopted code edition, its local amendments, and whether the AHJ classifies the work as maintenance, repair or a roof recover.
Evidence to require: A written answer from the AHJ, and confirmation of whether a permit and inspection apply.
If it fails: Re-scope to what the jurisdiction actually permits. The model code’s layer-count exception for coatings is not a nationwide rule.

6. Who owns the recoat cycle?

What settles it: The manufacturer’s written maintenance requirement, the recoat interval, and whether your ownership horizon reaches it.
Evidence to require: The recoat in the capital plan with a date and a number, plus the inspection cadence the warranty conditions require.
If it fails: Price replacement instead. An unfunded recoat turns a restoration into a shorter, more expensive roof.

This is a screening framework, not a specification. It orders the questions and names the evidence; it does not replace a condition assessment by a qualified consultant, the manufacturer’s written requirements for the specific product, or the authority having jurisdiction.

Stop — immediate hazard

A deflecting deck under a wet roof is a structural emergency, not a roofing decision

Water is load. Model IBC computes rain load as roughly five pounds per square foot for each inch of depth and sends ponding instability to ASCE 7, because a deck that deflects collects more water, which deflects it further. Saturated insulation adds its own weight on top of that, and it does so quietly and over years.

The signs that this has stopped being a maintenance conversation: visible sagging between structural members, a deck reported soft underfoot by whoever was last up there for work, ponded areas that have grown or moved since the last inspection, ceiling tiles staining repeatedly over the same structural bay, or new cracking in interior finishes below the roof.

Clear the space below, restrict access to that area of the roof, and get a licensed structural engineer on it before anyone schedules a coating, a survey or a repair. Contact the building’s emergency services if a collapse looks imminent.

Reading a data sheet

What the ASTM standard on the data sheet actually certifiesSection link

“Meets ASTM D6083” is the most quoted line in coating literature and one of the least understood. The model code names one material standard per coating type. Each of those standards is a specification for a material, and each of them stops well short of the claim it gets used to support.

Roof coating types and their material standards as named in model IBC Table 1509.2, with what each standard is a specification for and the gap it leaves. Model code text read in a commercial reproduction and cross-checked against the ICC public-access edition; standard scopes read on ASTM’s own product pages or quoted from the standard titles as the code cites them.
Coating type, as the model code names it	Material standard cited	What the standard is a specification for	The gap it leaves
Acrylic coating	ASTM D6083/D6083M — Liquid-Applied Acrylic Coating Used in Roofing (2024 edition)	Water-dispersed acrylic latex elastomeric roof coatings: liquid properties, and dry-film elongation, tensile strength, permeance, water swelling, adhesion, fungi resistance, tear resistance and low-temperature flexibility after weathering.	The standard says plainly that it does not provide guidance for application. It is a laboratory conformance test on a material, not a statement that the material suits your substrate, your slope, or standing water.
Silicone coating	ASTM D6694 — Liquid-applied Silicone Coating Used in Spray Polyurethane Foam Roofing Systems	A liquid-applied silicone coating, specified in a standard whose own title scopes it to spray polyurethane foam roofing systems.	The model code table cites it for silicone roof coatings generally, while the standard was written around a different substrate. Over single-ply, modified bitumen or metal, the compliance claim is doing work the standard’s title does not.
Moisture-cured polyurethane coating	ASTM D6947/D6947M — Liquid Applied Moisture Cured Polyurethane Coating Used in Spray Polyurethane Foam Roofing System	A single-component solvent-borne moisture-curing urethane elastomeric coating for application to spray polyurethane foam surfaces by brushing, rolling or spraying.	Same scope question as silicone, in the standard’s own title. Urethanes are commonly proposed as a base or traffic coat on other substrates; that use is outside what this specification was written for.
Asphaltic emulsion coating	ASTM D1227 — Emulsified Asphalt Used as a Protective Coating for Roofing	An emulsified asphalt protective coating, the traditional surfacing renewal for built-up and bituminous roofs.	A dark coating is not a reflective one, and reflectivity is most of what restoration is sold on. Asphaltic chemistries are a maintenance surfacing, not a cool-roof strategy.
Asphalt coating and asphalt roof coating	ASTM D2823 (Asphalt Roof Coatings, Asbestos Containing) and ASTM D4479 (Asphalt Roof Coatings — Asbestos-free)	Two asphalt roof coating specifications distinguished by whether the product contains asbestos.	The pairing is a reminder rather than a product choice: older roofing products may contain asbestos, and disturbance during preparation of an aged roof is a survey question before it is a coating question.
Aluminum-pigmented asphalt coating	ASTM D2824 — Aluminum-pigmented Asphalt Roof Coatings, Non-fibrated and Fibrated without Asbestos	Asphalt coatings pigmented with aluminium flake, historically used to add reflectivity to a bituminous surface.	Reflectivity from aluminium pigment is not equivalent to a rated white coating, and it is not rated at all unless the specific product appears in a rating directory with an aged value.
All of them, on fire	Fire classification under the model code’s Section 1505, determined by ASTM E108 or UL 790	The classification of a tested roof assembly — deck, insulation, cover board, membrane and coating together.	None of the material standards above is a fire classification. NRCA’s position is that a coating must be included in the assembly’s fire classification listing, and that listing guidelines typically require the testing agency’s label on the package.

Read this table one item at a time

Acrylic coating

Material standard cited: ASTM D6083/D6083M — Liquid-Applied Acrylic Coating Used in Roofing (2024 edition)
What the standard is a specification for: Water-dispersed acrylic latex elastomeric roof coatings: liquid properties, and dry-film elongation, tensile strength, permeance, water swelling, adhesion, fungi resistance, tear resistance and low-temperature flexibility after weathering.
The gap it leaves: The standard says plainly that it does not provide guidance for application. It is a laboratory conformance test on a material, not a statement that the material suits your substrate, your slope, or standing water.

Silicone coating

Material standard cited: ASTM D6694 — Liquid-applied Silicone Coating Used in Spray Polyurethane Foam Roofing Systems
What the standard is a specification for: A liquid-applied silicone coating, specified in a standard whose own title scopes it to spray polyurethane foam roofing systems.
The gap it leaves: The model code table cites it for silicone roof coatings generally, while the standard was written around a different substrate. Over single-ply, modified bitumen or metal, the compliance claim is doing work the standard’s title does not.

Moisture-cured polyurethane coating

Material standard cited: ASTM D6947/D6947M — Liquid Applied Moisture Cured Polyurethane Coating Used in Spray Polyurethane Foam Roofing System
What the standard is a specification for: A single-component solvent-borne moisture-curing urethane elastomeric coating for application to spray polyurethane foam surfaces by brushing, rolling or spraying.
The gap it leaves: Same scope question as silicone, in the standard’s own title. Urethanes are commonly proposed as a base or traffic coat on other substrates; that use is outside what this specification was written for.

Asphaltic emulsion coating

Material standard cited: ASTM D1227 — Emulsified Asphalt Used as a Protective Coating for Roofing
What the standard is a specification for: An emulsified asphalt protective coating, the traditional surfacing renewal for built-up and bituminous roofs.
The gap it leaves: A dark coating is not a reflective one, and reflectivity is most of what restoration is sold on. Asphaltic chemistries are a maintenance surfacing, not a cool-roof strategy.

Asphalt coating and asphalt roof coating

Material standard cited: ASTM D2823 (Asphalt Roof Coatings, Asbestos Containing) and ASTM D4479 (Asphalt Roof Coatings — Asbestos-free)
What the standard is a specification for: Two asphalt roof coating specifications distinguished by whether the product contains asbestos.
The gap it leaves: The pairing is a reminder rather than a product choice: older roofing products may contain asbestos, and disturbance during preparation of an aged roof is a survey question before it is a coating question.

Aluminum-pigmented asphalt coating

Material standard cited: ASTM D2824 — Aluminum-pigmented Asphalt Roof Coatings, Non-fibrated and Fibrated without Asbestos
What the standard is a specification for: Asphalt coatings pigmented with aluminium flake, historically used to add reflectivity to a bituminous surface.
The gap it leaves: Reflectivity from aluminium pigment is not equivalent to a rated white coating, and it is not rated at all unless the specific product appears in a rating directory with an aged value.

All of them, on fire

Material standard cited: Fire classification under the model code’s Section 1505, determined by ASTM E108 or UL 790
What the standard is a specification for: The classification of a tested roof assembly — deck, insulation, cover board, membrane and coating together.
The gap it leaves: None of the material standards above is a fire classification. NRCA’s position is that a coating must be included in the assembly’s fire classification listing, and that listing guidelines typically require the testing agency’s label on the package.

Model code text, not law. There is no nationwide building code, and your adopted edition, local amendments and authority having jurisdiction govern what applies to your building. NRCA has also noted a structural gap in the codes: for the 2018 edition it observed that specific roof coating requirements were not provided for coating use on polymer-modified bitumen, single-ply or metal panel roof systems, and that the alternative materials acceptance provisions were the route in that case.

Cost and lifecycle

The arithmetic, and why this page publishes no price per square footSection link

No transparent national dataset publishes installed restoration prices against installed replacement prices for commercial low-slope roofs, so this page does not invent one. What can be published is the comparison that actually decides it, which is a division rather than a subtraction.

Break-even: the share of the replacement price a restoration can cost before it stops paying on cost per year alone. Each cell is the added service years divided by the replacement service life, as a percentage. Both service figures are the reader’s own planning assumptions — this page publishes neither.
Added service the restoration is planned to buy	If replacement is planned to last 20 years	If replacement is planned to last 25 years	If replacement is planned to last 30 years
5 years	25%	20%	17%
8 years	40%	32%	27%
10 years	50%	40%	33%
12 years	60%	48%	40%
15 years	75%	60%	50%

Read this table one item at a time

5 years

If replacement is planned to last 20 years: 25%
If replacement is planned to last 25 years: 20%
If replacement is planned to last 30 years: 17%

8 years

If replacement is planned to last 20 years: 40%
If replacement is planned to last 25 years: 32%
If replacement is planned to last 30 years: 27%

10 years

If replacement is planned to last 20 years: 50%
If replacement is planned to last 25 years: 40%
If replacement is planned to last 30 years: 33%

12 years

If replacement is planned to last 20 years: 60%
If replacement is planned to last 25 years: 48%
If replacement is planned to last 30 years: 40%

15 years

If replacement is planned to last 20 years: 75%
If replacement is planned to last 25 years: 60%
If replacement is planned to last 30 years: 50%

Percentages rounded to the nearest whole number. The restoration side of the comparison must include every scheduled recoat that falls inside the added-service period, plus the inspections and drain maintenance the warranty conditions require. If those are missing from the proposal, the ratio is being computed against the wrong number.

Units: A ratio, not a currency: total restoration spend — first application plus every scheduled recoat inside the added-service period — expressed as a percentage of the installed replacement price for the same roof. Both prices come from the reader’s own proposals.
Scope included: Two whole proposals compared: restoration including its recoat cycle, against replacement including tear-off, disposal, insulation, cover board, attachment, drainage correction and edge metal.
Not included: Discounting and inflation, tax treatment, disruption and business-interruption cost, the value of the insulation and drainage upgrade a tear-off would force, residual value at the end of the horizon, and the risk that the restoration ends early because the survey missed something.
Geography: None. This page publishes no market price for any roof in any market, and no regional multiplier.
Data as of: The table is arithmetic rather than data, so it does not age. The sources beneath this page were re-read on 26 August 2026.
Confidence: High as arithmetic — every cell is a division a reader can repeat in a spreadsheet. Zero as a price, because no price is asserted anywhere on this page.
Method: How this figure is built

How to use it

Suppose your capital plan carries a replacement at a 25-year service life, and the restoration proposal in front of you claims ten more years. Ten divided by twenty-five is forty per cent. So the restoration — first application plus every recoat inside those ten years — has to land under forty per cent of the replacement quote before it is cheaper per year of roof. Above that line you are paying more per year for less roof, and buying deferral rather than value.

Run it the other way when a proposal quotes a price but not a life. Divide the restoration total by the replacement total, then multiply by your replacement service life. That is the number of added years the restoration has to deliver to break even, and it is a far more answerable question to put to a contractor than “how long will this last?”

Three ways this arithmetic lies to you

It ignores the time value of money, which favours restoration. Deferring a large capital outlay has real worth at any positive discount rate, and this table gives restoration no credit for it. A proper comparison discounts both cash-flow streams over the same horizon with the same rate.
It treats every year as the same year, which favours restoration again. A replacement resets the insulation to whatever the adopted energy code requires, resets drainage, resets attachment to a current wind design, and starts a new warranty clock on a new assembly. A restoration resets the surface. Those are not the same product bought at different prices.
It assumes the added years are real, which favours whoever wrote the proposal. The added-service figure is a planning assumption, not a warranty term and not an observation. The moisture survey and the adhesion test are what make it credible; nothing else on the proposal does.

No number on this page is a price. The only prices that matter are the two in front of you, and the only honest way to compare them is to put every scheduled recoat, inspection and drain-maintenance visit inside the restoration number before dividing.

Considerations

What changes this on a real buildingSection link

Moisture and ventilation: The single gating condition. Survey by one of the three recognised non-destructive methods, verify by cores, and require the wet areas to be mapped rather than summarised as a percentage. Where the map is small and bounded, cut it out, replace the insulation, patch the membrane and coat the rest. Where it is diffuse, restoration is the wrong instrument.
A survey is an inference confirmed by a core, not a reading. A report with no core locations, no gravimetric results and no plan drawing is not a moisture survey; it is a walk-around with a meter.
Structural weight: A coating adds negligible weight and no capacity whatsoever. What it can do is preserve a load the building is already carrying. Saturated insulation holds water, and ponding puts more on top: model IBC expresses rain load as R = 5.2(d_s + d_h + d_p) in pounds per square foot with the depths in inches, so roughly five pounds per square foot for every inch of standing water, and it refers the design itself to Chapter 8 of ASCE 7. A deflecting deck collects more water, which deflects it further.
Nothing here is a structural determination. Ponding depth, deck capacity and ponding instability are questions for a licensed structural engineer looking at this building and its drawings.
Slope and drainage: Restoration is slope-neutral by construction. It cannot add a cricket, a sump, a scupper or an overflow, and it cannot raise a roof drain that sits proud of the field. If the drainage complaint on your condition report survives the coating, it survives the whole extended life you just bought.
Correcting drainage is a design exercise — tapered insulation layout, drain sizing, overflow provision — done by a qualified design professional against the adopted code, not chosen from a coating catalogue.
Fire: Fire classification belongs to a tested assembly, not to a product. On a low-slope roof the deck, insulation, cover board, membrane and now the coating are all part of what was tested. NRCA’s technical services staff put it directly: for a roof coating to comply with the code’s fire classification section, it also needs to be included in the roof assembly’s fire classification listing, and approved testing agencies’ listing guidelines typically require the product to carry the testing agency’s label.
A Class A claim for a coating in isolation is not a claim about your roof. Ask for the listing that includes the coating over your specific deck, insulation and membrane, and check the label on the pail.
Wind: A coating attaches nothing. Whatever holds the membrane down — fasteners and plates, adhesive, ballast — is what still holds it down afterwards, in the same pattern, at the same density. Uplift performance is a property of an assembly on a specific building at a specific site, and FM Approvals and UL listings apply to particular tested assemblies at particular attachment densities, with different requirements in field, perimeter and corner zones.
No coating carries a wind rating of its own, and no coating upgrades the uplift performance of the assembly under it. If the existing attachment is the problem, restoration is not the remedy.
Code and jurisdiction: Model IBC now treats roof coatings as their own category: a Chapter 2 definition, a dedicated section requiring compliance with the fire classification provisions, and a materials table naming the ASTM specification for each coating type. Reroofing provisions add the point owners care about — a new protective coating over an existing coating or covering is not counted as an additional roof-covering layer against the two-layer limit — and the exception owners are rarely shown, that a recover is not permitted over a water-soaked or inadequately sound existing roof.
All of that is model text, read in reproductions of the 2024 edition. There is no nationwide building code. Your jurisdiction’s adopted edition, its local amendments, and the authority having jurisdiction decide what applies to your building, and whether this work is even classified as reroofing.
Climate: A white coating is a cool roof decision, and it is measured rather than asserted. The Cool Roof Rating Council rates solar reflectance and thermal emittance initially and again after three years of outdoor weathering at test farms in Arizona, Ohio and Florida, chosen to represent hot and dry, cold and temperate, and hot and humid conditions. The three-year aged values replace the initial rapid ratings in the directory. The aged column is the honest one, because a coating holds dirt.
CRRC states that a product’s presence in its directory does not mean the product is cool as defined by any particular code, standard or programme. And cool-roof benefit is climate-dependent: reflectivity that pays in a cooling-dominated climate can carry a heating penalty in a cold one.
Maintenance: Restoration converts a capital item into a maintained one, and that is the point rather than a side effect. Drains have to stay clear, because the coating cannot outrun standing water. Walkway protection has to be in place on service routes, because technicians walk to the units regardless. Inspections have to be documented, because the warranty will ask. And the recoat has to appear in the operating budget on a date, not as an intention.
NRCA published applicator guidelines in March 2026 covering substrate evaluation, repairs and preparation before coating, and coating selection and application. Ask whether the crew works to them.

Warranty and repair

What a restoration warranty covers, and how it differs from a new-system warrantySection link

This is the section where restoration is most often mis-sold, because two documents with the same length in years can be different instruments entirely.

Restoration warranty against new-system warranty: A new-system warranty is written over an assembly the manufacturer specified and an installer it approved, on materials it supplied, over a substrate that was newly built. A restoration warranty is written over somebody else’s roof. The manufacturer warrants its film; the condition, adhesion and remaining life of the substrate under that film are usually somebody else’s risk, and often nobody’s. Read who carries that risk before you read the term length.
Who the obligor actually is: Three different documents get called “the warranty”: a manufacturer’s material warranty covering the coating itself, a contractor’s workmanship warranty covering the application, and a manufacturer-issued system warranty covering both. They fail in different directions. A material-only document leaves you buying the labour to fix a material defect.
Whether it is prorated, and against what: A prorated warranty reduces what is recoverable as the film ages, which is a very different promise from an NDL warranty on a new system, where the manufacturer covers repair cost without a cap tied to the original material price. Ask which one is on offer, in writing, and ask what the recoverable amount looks like in year eight.
The conditions that keep it alive: Restoration warranties commonly carry maintenance obligations: scheduled inspections, drain clearing, prompt repair of damage, documented records, and the recoat itself. These are not boilerplate. They are the clauses a warranty administrator reads first when a claim arrives, and an owner who cannot produce the records is arguing from a weak position regardless of the merits.
The exclusions that matter on this particular decision: Look specifically for ponding water, pre-existing moisture in the assembly, failure of the substrate as distinct from failure of the coating, and damage from rooftop traffic. Those four exclusions map precisely onto the four ways a restoration goes wrong, which is not a coincidence.
Transferability: If the building may be sold inside the term, whether the instrument transfers — and on what notice, fee and inspection conditions — is part of the asset value. See transferable warranty.

Repairability

Coatings are among the most repairable surfaces on a commercial roof, in the narrow sense that a damaged area is cleaned, primed if required, and re-coated in kind with no welding, no torch and no specialist plant. Any competent crew can do it, which matters for a portfolio spread across markets.

The constraint is compatibility rather than difficulty. The chemistry already on the roof decides what may go over it: one silicone product’s own published instructions prohibit recoating it with acrylic, urethane or Hypalon. And when the roof eventually is replaced, the coating is part of what has to come off or be worked over, which belongs in the tear-off assumptions of the replacement estimate rather than as a surprise in year fourteen.

A warranty is a contract between a reader and whoever wrote it. What it covers, what voids it, whether it transfers, and how it is enforced are set by that document and by the law where the reader lives. Read the actual warranty for the product and the installer in front of you — not a summary of one, including this one.

Ask before you sign

Questions to ask before a restoration proposal becomes a contractSection link

Most of these have short, checkable answers. The ones that produce a long answer are the ones worth following.

Which moisture survey method did you use, on what date, and can I see the core-cut locations and the gravimetric results?
A good answer names the method and its standard, shows a plan with marked cores, and reports oven-dried moisture content by weight. A weak answer offers thermal images with no cores, or a percentage of the roof with no map. Infrared, nuclear and impedance findings all require confirmation by core extraction.
What are you doing about the areas the survey flagged, and is that work in this price?
The legitimate answer is cut it out, replace the insulation and cover board, patch the membrane, then coat. The answer to walk away from is any version of “the coating will take care of it.”
Will you run an adhesion test patch on a prepared, representative area before we sign, and what happens if it fails?
Manufacturers’ own instructions call for adhesion verification on a prepared representative area. A contractor who will not spend a morning proving the film sticks to your specific weathered, possibly previously-coated substrate is transferring that risk to you.
What is the dry film thickness at completion, and at what coverage rate per square, in how many coats?
This is where two coating proposals actually differ. Coverage rates are published per square and drop on textured or weathered substrates; a thinner film is a shorter life, and it is invisible once cured.
When is the first recoat due, what will it cost in today’s money, and is it a condition of the warranty?
Restoration is a programme. If the recoat interval is not in the proposal and not in your capital plan, the extended service life being quoted is not the one you will get.
Which ASTM material standard does this product comply with, and is the coating included in the fire classification listing for my assembly?
NRCA has publicly noted that a number of coating products on the market do not carry the product standards and approved testing agency markings needed to substantiate code compliance. The listing has to cover the coating over your deck, insulation and membrane, not the coating alone.
Has the authority having jurisdiction been asked whether this is maintenance, repair or a recover, and does a permit apply?
Maintenance, repair, recover and replacement are separate terms in an adopted code with separate obligations. The answer varies by jurisdiction and edition, and a contractor who has never asked is telling you something.
What can be applied over this coating in fifteen years, and what does removing it cost if we replace instead?
Chemistry lock-in is real and it is written into manufacturers’ own instructions. This question turns a fifteen-year decision into a visible one rather than an inherited one.

Require these in writing before you compare two proposals

The moisture survey report: method, standard, date, plan drawing with core locations, gravimetric results, and the surveyor’s qualification.
A quantified schedule of substrate repair — square footage of insulation and cover board removal and replacement, membrane patching, flashing and termination repair — priced separately from the coating.
Surface preparation scope: debris removal, repair before washing, cleaner and method, biological treatment, rinse, and how dryness will be confirmed before coating.
Primer requirement, stated by substrate, and the adhesion test result the primer decision was based on.
Product name, manufacturer, ASTM material standard, and the fire classification listing that includes this coating over this assembly.
Coverage rate per roofing square, number of coats, and the specified dry film thickness at completion.
The recoat interval and the maintenance obligations the warranty depends on, quoted from the warranty document rather than summarised.
The warranty itself — full text, not a certificate — naming the obligor, the term, whether it is prorated, the exclusions, and the transfer conditions.
Detail treatment at drains, scuppers, curbs, pipe supports and terminations, which is where a monolithic film either earns its price or does not.

What goes wrong

Misconceptions and failure modesSection link

Restoration is the most oversold category in commercial roofing, and the overselling follows a small number of repeatable scripts.

Common misconceptions

Common belief
A restoration coating is basically a new roof for half the price.
What is actually true
Model IBC defines a roof coating as a fluid-applied, adhered coating used for roof maintenance or roof repair, or as a component of a roof covering system or roof assembly. Maintenance, repair or a component: those are the three things the model code says a coating is. A new roof replaces the assembly. A coating renews its surface.
Common belief
The infrared scan came back clean, so the roof is dry.
What is actually true
An infrared imager measures temperature. ASTM C1153 covers night-time thermal imaging precisely because wet insulation cools more slowly, and the same practice addresses verification of the infrared data using invasive test methods. A scan with no confirming cores is a screening tool that has not been confirmed, and it produces both false positives and false negatives.
Common belief
Wet insulation will dry out once the roof stops leaking.
What is actually true
Nothing in a coating dries insulation. Sealing the surface leaves the water where it is, against the deck, and closes whatever upward drying the old surface still allowed through its splits and open laps. This is why model IBC does not permit a recover where the existing roof is water-soaked, and why NRCA’s magazine states that current industry guidelines, building codes and common good roofing practice require that a moisture-laden roof not be recovered.
Common belief
The coating gets us a Class A roof.
What is actually true
Fire classification is a property of a tested assembly. NRCA has stated that a roof coating also needs to be included in the roof assembly’s fire classification listing for it to comply with the code’s fire classification section, and that listing guidelines typically require the listed product to bear the testing agency’s label. A coating carries no fire classification by itself.
Common belief
It is an ENERGY STAR product, so the savings are federally certified.
What is actually true
The ENERGY STAR specification for roof products was sunset on 1 June 2022. No roofing product has been certifiable to it since. Reflectance and emittance claims today are checked in the Cool Roof Rating Council’s rated products directory — and CRRC itself says that appearing in that directory does not mean a product is cool as defined by any code, standard or programme.
Common belief
Silicone is the best coating, so it is the safe default.
What is actually true
Silicone is genuinely strong where water stands, which is why it is so widely specified. It is also the choice that most constrains your next one: one manufacturer’s published instructions prohibit recoating its cured silicone with acrylic, urethane or Hypalon. That is a fifteen-year commitment made in year one, and it should be made deliberately rather than by default.
Common belief
Restoration is an operating expense, so it avoids a capital request.
What is actually true
Whether a particular roof expenditure is deducted or capitalised is a fact-specific determination under federal tax rules, decided by your accountant on your facts. It is not a property of the product, and a contractor’s sales sheet is not a tax opinion. This page takes no position on the treatment of any expenditure.

How it actually fails

Adhesion failure: The film never bonded, usually because the substrate was chalked, dirty, contaminated with silicone or oil residue, or not actually dry when the first coat went on. Manufacturer instructions require the roof to be clean and dry and call for an adhesion test on a prepared representative area; skipping both is the common antecedent.What you can see: Sheets or ribbons of film lifting at edges, curbs and drains first; the coating peeling back cleanly with the substrate pattern still visible underneath.
Short film: Applied below the specified dry film thickness, either by cutting coats or by using a published coverage rate on a rough or weathered substrate that consumes more material than a smooth one. It is invisible at handover and shows up years early.What you can see: Premature chalking and erosion, the substrate colour or reinforcing scrim showing through on the weather side, and wear concentrated on the sunniest slope.
Sealed-in moisture: Wet insulation left in place under a new low-permeance film. Thermal performance is already degraded, the water stays against the deck, and steel deck corrosion proceeds out of sight.What you can see: Blisters that reappear in the same locations after being cut and patched; a later infrared survey showing the flagged zones unchanged or larger; rust staining at deck flutes seen from below.
Ponding degradation: Water standing on a surface the coating did not re-slope. Water loading is also a structural input: model IBC computes rain load as roughly five pounds per square foot per inch of depth and refers ponding instability to ASCE 7.What you can see: Discoloured, softened or blistered film confined to the low areas; dirt tide-marks that map the pond outline; the same footprint visible in the pre-coating condition report.
Reflectance loss: Dirt accumulation on a white film. CRRC rates roof products initially and again after three years of outdoor weathering, and the three-year aged values replace the initial ratings in the directory precisely because the initial number does not survive the field.What you can see: A visibly grey roof within a season or two; measured energy savings falling short of the pitch; a proposal that quoted the initial reflectance and never mentioned the aged value.
The recoat that never happened: The film reached the end of its service life on schedule, but the recoat was never budgeted, the inspections were never documented, and the maintenance conditions in the warranty went unmet.What you can see: A warranty claim declined on maintenance grounds; a roof that is now both uncoated and older; a replacement that arrives anyway, after the restoration spend.

Sources and further readingSection link

Understanding Roofing / Published August 26, 2026

Scope and limitations

It cannot tell you whether your roof is a restoration candidate.
That answer comes from a moisture survey verified by cores, an adhesion test on your substrate, and a condition assessment by a qualified consultant or contractor who has been on the roof.
It publishes no price.
No transparent national dataset separates installed restoration cost from installed replacement cost for commercial low-slope roofs, so the cost section publishes a break-even ratio you compute from your own two proposals instead of a figure this page cannot source.
It publishes no service-life figure for any coating chemistry.
Manufacturer terms are warranty terms rather than observed service, and the added-service years in the break-even table are the reader’s own planning assumption, not a claim made here.
It does not rank acrylic, silicone and urethane against each other on ponding, dirt pickup or recoatability.
Those are product-specific properties governed by a specific formulation, and no source at an acceptable tier supports a category-level ranking.
What can be said is recorded: the ASTM material standard each type is cited under, what that standard is a specification for, and one manufacturer’s own written recoat prohibition, quoted as product-specific.
It cannot tell you what your jurisdiction requires, or even whether your jurisdiction classifies a coating application as reroofing at all.
Every code provision here is model text.
Your adopted edition, its local amendments and your authority having jurisdiction govern.
It is not a structural, drainage or wind-design determination.
Rain load, ponding instability, deck capacity, drainage design and uplift are all matters for a licensed design professional and the AHJ.
It takes no position on the tax treatment of any roof expenditure.
That is a fact-specific determination for your accountant.
It describes how these documents are structured and what to read; it does not state what any warranty covers, whether it is enforceable, or what rights you have.

2024 International Building Code, Chapter 15: Roof Assemblies and Rooftop Structures
International Code Council — codes.iccsafe.org, the publisher’s own public-access edition. MODEL CODE TEXT. / 2024 edition
The authoritative location of the model text this page relies on: Section 1505 fire classification, Section 1509 roof coatings with Table 1509.2 material standards, and Section 1512.3 roof recover with its exceptions.
A model code published by a private standards organization. It is not law anywhere until a jurisdiction enacts it, and jurisdictions amend. The chapter is delivered through a script-driven reader, so the section text quoted on this page was read in the reproduction listed below and cross-checked against this edition’s section numbering.
Code text reproduced for reading and cross-checking: Chapter 2 definition of ROOF COATING, Sections 1509.1 and 1509.2 with Table 1509.2, Section 1512.3 roof recover and its exceptions, and Section 1611.1 design rain loads
UpCodes — a commercial code aggregator, not an official jurisdiction source. Pages consulted reproduce the Texas Windstorm Insurance Association Building Code 2024 and 2018, the Texas IHB Building Code 2021 and 2015, and the General Services Administration IBC 2024. / 2024 edition as reproduced
Reading the section text verbatim where the publisher’s own reader could not be extracted: the definition of roof coating; the Table 1509.2 mapping of acrylic to ASTM D6083, asphaltic emulsion to D1227, asphalt coating to D2823, asphalt roof coating to D4479, aluminum-pigmented asphalt to D2824, silicone to D6694 and moisture-cured polyurethane to D6947; the roof-recover permission for a new protective coating over an existing coating or covering; the exception prohibiting recover where the existing roof is water-soaked or has deteriorated to the point that it is not an adequate base; and the rain-load equation R = 5.2(ds + dh + dp) with its variable definitions, read at up.codes/s/design-rain-loads.
An aggregator, used here for text access and triangulation and never as the sole support for a code claim. A Texas Windstorm Insurance Association code is an insurance-program standard rather than a jurisdiction’s adopted law, and a GSA reproduction is a federal agency’s facilities standard. Neither is an adoption record for any state or city, and neither tells you what is in force where your building stands.
Coating concerns — building code compliance for roof coatings is limited
Mark S. Graham, vice president of technical services, National Roofing Contractors Association, in Professional Roofing, March 2019 / March 2019
The definition of roof coating carried into the code; the exact titles of ASTM D6083, D1227, D2823, D2824, D4479, D6694 and D6947 as the code cites them; the reroofing exception that a new coating over an existing coating or covering is not counted as a roof covering layer; the requirement that a roof coating be included in a roof assembly’s fire classification listing for it to comply with Section 1505, and that listing guidelines typically require the testing agency’s label on the package; NRCA’s stated position that field-applied coatings are a viable option for surfacing and for maintenance and repair when code compliance can be readily substantiated; and NRCA’s finding that a notable number of coating products on the market do not carry the product standards and testing agency markings needed to substantiate code compliance.
Written against the 2018 International Building Code. The 2021 edition restructured coating provisions into a dedicated section, so this article’s section numbers are superseded even where its substance is not. Trade guidance, not adopted law.
Roof coatings and code compliance
Mark S. Graham, National Roofing Contractors Association, in Professional Roofing, September 2022 / September 2022
That the 2018 codes added the clarifying statement about coatings not counting as an additional roof layer; that the 2021 edition added the Chapter 2 definition of roof coating, created Section 1509 specifically for roof coatings with Section 1509.2 naming seven product standards, and added Section 1512.2.1 for roof recover; and that roof coatings must comply with the fire classification requirements of Section 1505 as determined by ASTM E108 or UL 790.
Trade commentary on a model code, not law, and written against the 2021 edition rather than the 2024 edition cited above.
How wet is wet?
Matt Dupuis, Ph.D., P.E., in Professional Roofing (National Roofing Contractors Association), October 2023 / October 2023
The R80 rule and its attribution to Wayne Tobiasson — insulation considered wet and in need of replacement once it had lost 20 per cent of its thermal resistance; that polyisocyanurate would need to reach a moisture content of about 262 per cent by weight to reach its R80 point; that gravimetric analysis, drying a roof sample in a laboratory convection oven, is the most accurate measurement; and that current industry guidelines, building codes and common good roofing practice require a moisture-laden roof not be recovered.
One qualified engineer’s argument in a trade magazine. The 262 per cent figure describes polyisocyanurate under the R80 criterion; it is cited here to show that the R80 threshold no longer describes when a modern assembly is compromised, not as a moisture limit to design to.
Surveying roof moisture
Michael T. Williams, in Professional Roofing (National Roofing Contractors Association), December 2025 / December 2025
That infrared imagers see temperature differences rather than moisture; that nuclear gauge field readings are relative and must be quantified through core cuts analysed gravimetrically; that impedance scanner readings are qualitative and must be correlated with gravimetric analysis of extracted cores; and that meters used without the applicable standards produce false positives and unnecessary removal of roofing materials.
Trade guidance describing good practice, not a standard itself and not a code requirement.
ASTM C1153-23, Standard Practice for Location of Wet Insulation in Roofing Systems Using Infrared Imaging
ASTM International / 2023 edition, current; it supersedes C1153-10(2015)
The scope of the infrared method: it applies to techniques employing infrared imaging at night to determine the location of wet insulation in roofing systems that have insulation above the deck in contact with the waterproofing, and the practice addresses verification of infrared data using invasive test methods.
The full standard is paywalled; the scope statement was read on the publisher’s own product page. A standard practice is not a code requirement, and it does not tell you what to do about what it finds.
ASTM D7954/D7954M-22a, Standard Practice for Moisture Surveying of Roofing and Waterproofing Systems Using Nondestructive Electrical Impedance Scanners
ASTM International / 2022 edition
That electrical impedance scanning locates moisture and evaluates comparative moisture content within insulated low-slope roofing and waterproofing systems, and that the practice addresses verification of impedance data involving invasive test procedures using core samples.
Paywalled beyond the scope statement read on the publisher’s product page. Comparative moisture content is not a moisture percentage, and the method applies to electrically non-conductive membranes over above-deck insulation.
ASTM D6083/D6083M-24, Standard Specification for Liquid-Applied Acrylic Coating Used in Roofing
ASTM International / 2024 edition
That the acrylic standard cited by the model code covers water-dispersed acrylic latex elastomeric protective roof coatings; that it specifies liquid properties and dry-film properties including elongation, tensile strength, permeance, water swelling, adhesion, fungi resistance, tear resistance and low-temperature flexibility after weathering; and that the specification itself does not provide guidance for application.
A material specification. It is not a fire classification, not a wind rating, not a statement of suitability for any substrate, and not an application method.
IIBEC Technical Advisory No. 016-2018: Reuse of Roof Insulation
International Institute of Building Enclosure Consultants / 28 September 2018
That elevated moisture levels can negatively affect the adhesion of adhesives, asphalts and vapor retarders or membranes; that the three recognised non-destructive methods are infrared imaging under ASTM C1153, nuclear radioisotopic thermalization under ANSI/SPRI/IIBEC NT-1, Detection and Location of Latent Moisture in Building Roofing Systems — the source of the NT-1 designation used on this page — and electrical impedance scanning under ASTM D7954/D7954M; that all non-destructive test methods require confirming findings by extraction of roof core samples; and that roof performance suffers where proper testing and analysis of the existing roof assembly are not performed.
A technical advisory written about reusing insulation during reroofing rather than about coatings. It is professional guidance, not a standard and not adopted law.
Roof Rating Program
Cool Roof Rating Council
That CRRC rates solar reflectance and thermal emittance; that samples are weathered for three years at approved test farms in Arizona representing hot and dry, Ohio representing cold and temperate, and Florida representing hot and humid conditions; that on completion of three-year weathering the aged values replace the rapid ratings on the directory and product label; and CRRC’s own statement that a product’s placement on the directory does not mean the product is cool as defined by any particular code, standard or program.
A rating programme for radiative properties. It does not rate energy savings, durability, adhesion or service life, and it does not endorse products.
Roof Products Specification Version 3.0
ENERGY STAR — U.S. Environmental Protection Agency / Sunset effective 1 June 2022
That the ENERGY STAR specification for roof products was sunset on 1 June 2022, so no roofing product has been certifiable to ENERGY STAR since that date.
A programme record. It does not say anything about the performance of any coating, and the absence of the label is not evidence against a product.
ENERGY STAR Roofing Program Sunsets
Cool Roof Rating Council / 1 June 2022
Corroboration of the 1 June 2022 sunset date and that no roofing products in the market are certified to ENERGY STAR, together with CRRC’s rated products directory as the place reflectance and emittance values are now looked up.
A rating council’s announcement about a federal programme, used to corroborate the EPA page rather than to replace it.
GacoElastomeric Silicone Roof Coating — Application Instructions
Gaco (Firestone Building Products / Holcim). MANUFACTURER INSTRUCTIONS — PRODUCT-SPECIFIC, not a rule for any other product. / Document posted 2017
One worked example of what a real coating instruction requires: that it is extremely important to get the roof clean and dry; that open seams, tears and cuts are repaired before washing so water is not blown under the membrane; power scrubbing and rinsing until the suds are gone; separate biological treatment; examining the roof to confirm residual water has dried before coating; that to verify proper adhesion an adhesion test should be performed on a properly prepared and representative area of the substrate to be coated; a coverage rate of two gallons per 100 square feet in two coats, with coverage decreasing on heavily textured or weathered substrates; temperature and weather limits; the instruction not to recoat the product with acrylic, urethane or Hypalon coatings; and the manufacturer’s own caution that an old, neglected or failing roof does not have the resilience to withstand the rigors of weather and that the product may not be suitable for such a roof.
Product-specific. It governs this product on a roof where it is specified and nothing else. Other silicones, acrylics and urethanes carry their own instructions, which differ, and the manufacturer’s written instruction for the product actually proposed is the only one that applies to your roof.
NRCA releases guidelines for roof coating applicators
National Roofing Contractors Association / 17 March 2026
That NRCA publishes applicator guidance covering roof substrate evaluation, repairs and preparation steps before coating, and coating material selection and application, addressing single-ply membranes, built-up roofing, polymer-modified bitumen membranes, spray polyurethane foam and metal panel roof systems.
A publication announcement. The guidelines themselves are a paid NRCA publication and were not read for this page; nothing here is attributed to their contents beyond the scope NRCA describes.
29 CFR 1910.28 — Duty to have fall protection and falling object protection
U.S. Occupational Safety and Health Administration
That each employee on a walking-working surface with an unprotected side or edge four feet or more above a lower level must be protected from falling (1910.28(b)(1)(i)), and that low-slope roof work carries distance-keyed duties at less than six feet, six to fifteen feet, and fifteen feet or more from the edge (1910.28(b)(13)).
The general industry walking-working surfaces standard. Construction work is governed by 29 CFR part 1926 subpart M, which sets different triggers, and state plans may impose additional requirements. Nothing here is a compliance determination for any employer.
Low-Slope (“Flat”) Roofs
U.S. Department of Energy, Building America Solution Center (Pacific Northwest National Laboratory)
The general order of a low-slope assembly — structural deck, rigid above-deck insulation, cover board, membrane attached mechanically or fully adhered — and that air leaking from within the building into the roof assembly can make the membrane flutter and ultimately fail. The guide illustrates a wood-sheathed deck; the steel deck in this page’s diagram is drawn as the common commercial case and is not taken from this source.
Written primarily for residential and light-commercial low-slope construction as best-practice guidance, not as adopted law and not as a design method for a specific building.
Glossary
Roof Coatings Manufacturers Association
The industry definitions used on this page for acrylic roof coating (an elastomeric acrylic latex binder with pigments and additives), silicone roof coating (a dispersion containing silicone polymers with pigments and additives) and moisture-cured polyurethane roof coating, and RCMA’s use of the same roof coating definition the model code carries.
The trade association of coating manufacturers. Its definitions are useful and its interest is not neutral; nothing on this page rests on RCMA alone for a performance claim.

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