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Roof Coating Restoration Takeoffs: Field Area, Gallons from Dry Mils, and Repair Lines
Disclosure: Sharp Pencil sells commercial roofing takeoffs, so we have a stake in this topic.
Last updated: 2026-10-28. Sources and sister pages checked on 2026-10-28.
A commercial roof coating restoration takeoff measures the coat field, then converts the warranty dry mils and the product's volume solids into gallons using that product's data sheet. Prep, primer, seam and flashing repairs, and wet insulation from the moisture survey are separate lines, not buried in one SF rate. When the set or survey is silent, put the gap on the Questions tab. Sharp Pencil returns a four-file package with every quantity tied to its source sheet and its basis.
What a coating restoration takeoff is (and is not)
A coating restoration takeoff prices a fluid-applied system over an existing commercial roof that the documents treat as a candidate for restoration. It is not a tear-off quantity set. It is not a new membrane takeoff alone. It is not an owner-facing installed cost article.
The table below is a working checklist for estimators. It is not a code manual and not a Sharp Pencil warranty rulebook. Anything the set leaves open belongs on the Questions tab, not in a guessed quantity. For document differences on re-roof sets, see commercial re-roof takeoff.
| Topic | Coating restoration (typical) | Tear-off or recover (typical) | If the set is silent |
|---|---|---|---|
| Starting point | Existing roof stays as the base. Coat field + prep + repairs | Tear-off to deck or recover overlay as the set shows | Questions: coating vs tear-off vs recover for [area]? |
| Field quantity | Coat SF (and primer SF when specified) | New membrane SF + demolition / recover prep SF | Measure what is shown. Do not assume coating to skip demo |
| Material math | Gallons from dry mils + volume solids (data sheet) | Rolls / squares of membrane from system method | Never invent a universal gal/square |
| Wet insulation | Cut-out / replace from moisture survey, or unit price | Same risk on re-roof. Often larger demo | See unit-prices sister page. Questions if survey missing |
| Details | Seam reinforcement, flashings, penetrations, walk pads when specified | Tear-off flashing remove/replace. New flashings | Follow coating details / specs |
A deeper tear-off vs recover quantity page is planned. Until it is live, do not invent that full method here. Sharp Pencil lists existing-conditions questions on the roofing RFI register. Prefer a Questions-tab line such as "confirm coating vs tear-off vs recover for [area]" over guessing the path.
Documents and exhibits to read before you measure
On a coating restoration, the moisture survey, cores, coating system specification, and prep notes often set the quantities before you scale the roof plan.
Coating habit before you measure field area:
- Find the roof plan, aerial, or stated field-measure basis for coat SF.
- Read moisture survey exhibits (IR, capacitance, nuclear) and core cut summaries when the bid set includes them.
- Read the coating system specification: product name, target dry mils, primer, reinforcement, and warranty tier when named.
- Read preparation and cleaning notes, plus adhesion test requirements when they are in the bid docs.
- Read details for seams, flashings, curbs, drains, and penetrations.
- Read spec sections for roof coating / restoration when present.
- Read any steep-slope sheets when standing seam or shingle is in the same package.
- If the set never names a product or mils, measure the SF you can and put product, mils, and solids on the Questions tab. Do not invent a chemistry.
For the habit of reading sheets beyond the roof plan on any commercial takeoff, see the sheets a roofing takeoff has to read. Here we only call out coating-specific exhibits.
Field area: what SF you are coating
Start with the coatable field SF from the drawings or a stated field measure, then subtract or key areas the documents exclude (new overlay zones, open tear-off patches already scoped elsewhere, equipment that will not be coated).
Separate lines when the set separates them: field coat SF, primer SF, detail-only reinforcement LF or SF, walk-pad SF when specified.
Do not invent a waste percent for SF. If the set gives a waste factor, cite it. If not, put waste on the Questions tab or leave it for the estimator's price. Do not pad the takeoff with a fake waste number.
When the same package also includes low-slope membrane work (TPO, EPDM, PVC, mod bit, BUR) or steep slope (standing seam and shingle), take those systems in full. Take the full steep-slope linear list when standing seam or shingle is in the package. See standing seam metal roof takeoff and asphalt shingle roof takeoff. If the coating field sits next to steep work that stays or is replaced, see mixed-system commercial roof takeoff. If the coating bid also has drainage or taper work, see tapered insulation takeoff.
When the roof is spray polyurethane foam (SPF) with a protective topcoat, see SPF roof takeoff for foam board feet and foam taper. Coating gallons from dry mils stay on this page.
Gallons from dry mils (data sheet only)
Gallons follow the product's published volume solids and the warranty dry mils for that system, not a blog rule of thumb and not a Sharp Pencil default yield.
Use the product data sheet rate for this bid first. If the sheet already states gallons per 100 SF (or per square) for the mil target on this warranty tier, use that published rate. Do not invent a parallel Sharp Pencil number.
Method when you must build from mils and solids (still data-sheet driven):
- Read target dry mils from the system specification or data sheet for the warranty tier on this bid.
- Read volume solids (percent solids by volume) from the same product's data sheet. Do not swap weight solids for volume solids.
- Prefer the sheet's published application rate (gal per 100 SF or per square) for that mil target. Only when the sheet gives solids and mils without a rate may you use the industry coating-math identity that painters and coating estimators use: 1,604 sq ft per gallon at 1 wet mil, with wet mils = dry mils / volume solids. That identity is attributed general coating math. It is not a Sharp Pencil default yield.
- Apply only the waste or loss factor the data sheet or bid documents state. If none, do not invent 10% or 15%. Put the gap on the Questions tab or leave loss for estimator pricing outside the takeoff number.
Attributed example (not a Sharp Pencil default): GacoFlex S20 Series product data sheet (public PDF on gaco.com, figures checked 2026-10-28 against the GacoFlex S20 Series PDS): theoretical coverage 1.5 gal / 100 ft² to yield about 22 dry mil. On smooth surfaces minimum 1.5 gal / 100 ft² for about 22 dry mil. On granulated or rough surfaces 2 gal / 100 ft² for 22 dry mil. Volume solids listed 95%. The sheet notes that application rate is job-specific and losses may require more material.
- Never publish a universal "silicone is always X gal/square" as Sharp Pencil fact.
- Never copy competitor installed $/SF ranges in as takeoff quantities.
- Label any worked gallons example "Example, made up for illustration" and list the assumed product, mils, solids, and SF.
Moisture survey and wet insulation lines
Wet insulation found on a moisture survey is cut out and replaced (and the membrane patched) before coating, or it is carried as a unit price when the survey quantity is incomplete. Coating over known wet insulation is a Questions-tab risk item, not a buried assumption.
Measure wet-area SF when the survey keys it. Carry replacement insulation and patch membrane as the documents show.
When the bid form asks for unit prices beyond an allowance, see roofing bid alternates and unit prices. Do not invent a unit price dollar.
If no moisture survey is in the set, put "moisture survey status / wet insulation quantity?" and "confirm wet area and whether coating remains allowed" on the Questions tab. See the roofing RFI register. Do not invent a wet-area percent. Do not apply a rule of thumb that turns a wet share into an automatic tear-off decision.
Prep, primer, seams, flashings, and other repair lines
A coating bid that only shows field gallons is incomplete. Prep, primer, seam reinforcement, flashing and penetration detailing, and walk pads when specified are separate takeoff lines.
Estimator checklist (what coating bid sets often include, not a Sharp Pencil required product list and not a universal required list):
- Cleaning / surface prep (SF or lump as docs show. Do not invent psi or chemistry)
- Primer SF and product when specified
- Seam reinforcement LF (or SF of three-course detail) when specified
- Flashing / curb / drain / penetration detail counts or LF
- Rust primer or fastener work on metal restorations when in scope
- Bleed-block or base coat over asphalt / mod bit when specified
- Walk pads / granules in service lanes when specified
- Granules or traffic coats only when the set calls for them
If the set says "detail as required" without quantity, put it on the Questions tab. Do not invent a percent of field SF.
Worked example: one made-up coating wing (not a real job)
Example, made up for illustration. This is not a real building, not a Sharp Pencil job, and not a price. Use it only to see how lines and Questions split on a coating set.
Assumptions (invented):
- One rectangular low-slope wing, 100 ft by 80 ft
- Coating plan A-501 shows coat field over the full wing (smooth existing membrane)
- System note names GacoFlex S20 for a 22 dry mil target on smooth substrate
- Gallons use the attributed Gaco S20 PDS cell checked 2026-10-28: 1.5 gal / 100 ft² for about 22 dry mil on smooth (not a Sharp Pencil default)
- Moisture survey exhibit MS-1 keys 420 SF of wet insulation cut-out / replace on that wing
- Detail note keys 280 LF of seam reinforcement
- Spec is silent on primer product and primer SF
- No steep-slope canopy on this wing
| Line | Quantity / status | Source sheet and basis |
|---|---|---|
| Coat field SF | 8,000 SF | A-501, 100 ft × 80 ft plan rectangle |
| Field coating gallons (smooth, ~22 dry mil) | 120 gal | 8,000 SF × 1.5 gal / 100 ft² from GacoFlex S20 PDS (checked 2026-10-28). Not an SP default |
| Wet insulation cut-out / replace | 420 SF | MS-1 moisture survey key |
| Seam reinforcement | 280 LF | Detail note on A-501 |
| Primer SF / product | On Questions tab | Spec silent. Do not invent primer chemistry or SF |
| Warranty tier / mils conflict | On Questions tab | If addendum changes mils or product, re-check gallons from that sheet |
No dollar totals. No waste percent invented (the cited PDS notes losses may require more material, so that stays a Questions / pricing judgment, not a fake takeoff pad). No ACM claim. No code section numbers. If this wing included a steep-slope entry canopy, field plus linear items would follow the standing seam or shingle sister pages.
Common misses on coating restoration takeoffs
- One blended $/SF with no gallons, mils, or solids basis
- Using weight solids instead of volume solids
- Inventing a waste factor the data sheet never states
- Skipping wet-insulation lines when a moisture survey is in the bid set
- Assuming coating when the set never rules out tear-off or recover
- Burying seam and flashing repairs inside field SF
- Ignoring primer or bleed-block when the system specification requires it
- Skipping steep-slope linear items when the same bid includes standing seam or shingle (see standing seam and shingle sisters)
FAQ
How do you take off a commercial roof coating restoration?
A coating restoration takeoff measures the coat field, converts the specified dry mils and volume solids into gallons using that product's data sheet, and separately carries prep, primer, seam and flashing repairs, and wet-insulation work from the moisture survey. When the set or survey is silent, put the gap on the Questions tab. Do not invent a universal gal/square or bury repairs in one blended SF rate.
How do you convert dry mils into gallons for a coating takeoff?
Use the product data sheet rate for this bid first. Read target dry mils and volume solids from that sheet. Prefer the sheet's published gal per 100 SF (or per square) for the mil target. Only when the sheet gives solids and mils without a rate may you use the industry coating-math identity (1,604 sq ft per gallon at 1 wet mil, and wet mils = dry mils / volume solids) as attributed general coating math, never as a Sharp Pencil default. Apply only the waste or loss factor the data sheet or bid docs state.
How does wet insulation from a moisture survey show up on the takeoff?
Measure wet-area SF when the survey keys it, and carry cut-out / replacement insulation and patch membrane as the documents show. When the bid form wants unit prices beyond an allowance, use the unit-prices method on roofing bid alternates and unit prices. If no survey is in the set, put moisture survey status and whether coating remains allowed on the Questions tab. See the roofing RFI register. Do not invent a wet-area percent.
What repair lines belong on a coating restoration takeoff besides field coating?
Prep and cleaning, primer when specified, seam reinforcement, flashing / curb / drain / penetration details, rust or fastener work on metal restorations when in scope, bleed-block or base coat when specified, and walk pads or traffic coats when the set calls for them. Treat that list as an estimator checklist of what coating bid sets often include, not a Sharp Pencil required product list. Silence becomes a Questions-tab line, not a guessed percent of field SF.
What does Sharp Pencil send back on a commercial coating or re-roof takeoff?
Four files: START HERE, marked-up drawings PDF, Takeoff.xlsx with a Questions tab, and the material order list. Every quantity carries its source sheet and its basis. Open coating items stay on the Questions tab. First takeoff free, one per contractor, on a job you're bidding or quoting. After that, $395 per new set of drawings, or monthly plans. Usually within one business day. Delivered within 48 hours*.
*Clock starts once any questions we send you are answered. Preview the roofing takeoff sample and what a takeoff costs.
Why send your takeoffs to Sharp Pencil
The expensive miss on a coating restoration bid is not only the field SF. It is gallons that cannot hit the warranty mils, wet insulation that never became a line, and seam or flashing repairs buried in one blended rate.
- Usually within one business day. Delivered within 48 hours*. A takeoff stuck in a week-long queue does you no good when the bid is due sooner.
- Every page gets read. Send the full set: architectural, structural, mechanical, plumbing, moisture survey exhibits, coating specs, and the spec book if you have it.
- Every quantity names its sheet. Every quantity carries its source sheet and its basis, so you can check it against the drawings.
- Questions instead of guesses. If the set leaves something open, it goes on the Questions tab in Takeoff.xlsx, not into the number as a guess.
- Checked before it goes out. Every paid takeoff is checked before delivery.
- Four files, one package. START HERE, marked-up drawings PDF, Takeoff.xlsx with a Questions tab, and the material order list.
- Your plans stay yours. A plan set you send us will never be used to compete with you, and plan sets are deleted whenever you ask. See what happens to your plans.
- First takeoff free, one per contractor, on a job you're bidding or quoting. After that, $395 per new set of drawings, or monthly plans. See what a takeoff costs and how it works.
Commercial roofing takeoffs for low-slope (TPO, EPDM, PVC, mod bit and BUR), standing seam and shingle roofs. Residential is not our focus today, but ask if you have a job in mind. See our commercial roofing takeoff services and where every number comes from.
Get your first takeoff free · See full pricing and plan terms · Or email [email protected]
*Clock starts once any questions we send you are answered.
The Sharp Pencil team
Get your first takeoff free · See full pricing and plan terms · Read how we handle your data · Or email [email protected]
Sources
- GacoFlex S20 Series PDS (attributed example only, not SP default): GacoFlex S20 Series PDS (figures checked 2026-10-28)
- Sharp Pencil commercial re-roof: /commercial-reroof-takeoff (checked 2026-10-28)
- Sharp Pencil bid alternates / unit prices: /roofing-bid-alternates-unit-prices (checked 2026-10-28)
- Sharp Pencil RFI register: /roofing-rfi-register (checked 2026-10-28)
- Sharp Pencil drawing sheets: /roofing-takeoff-drawing-sheets (checked 2026-10-28)
- Sharp Pencil tapered insulation: /tapered-insulation-takeoff (checked 2026-10-28)
- Sharp Pencil SPF roof: /spf-roof-takeoff (checked 2026-10-28)
- Sharp Pencil mixed-system: /mixed-system-commercial-roof-takeoff (checked 2026-10-28)
- Sharp Pencil cost: /commercial-roofing-takeoff-cost (checked 2026-10-28)
- Sharp Pencil sample: /roofing-takeoff-sample (checked 2026-10-28)
- Sharp Pencil standing seam: /standing-seam-metal-roof-takeoff (checked 2026-10-28)
- Sharp Pencil asphalt shingle: /asphalt-shingle-roof-takeoff (checked 2026-10-28)
- Sharp Pencil services, how it works, your-data, upload, pricing, accuracy, free offer, homepage four-file / free / $395 / turnaround / steep-slope scope (checked 2026-10-28)