SPF + coating
Foam is the roof and the coating is its weathering surface. New foam or old, the job is a topcoat that stays elastic and blocks UV.
- 3004Closed-cell 3-lb roofing foam
- R-6.2Per inch, ASTM C 518
What happens to SPF
Spray foam does not fail. Its coating does. UV chews through a worn topcoat and starts to erode the foam surface — first to orange peel, then to a coarse popcorn texture that soaks up coating and holds water.
Recoat while the surface is still smooth to orange peel and the job is a wash and a new topcoat. Wait until popcorn and you are scarfing and re-foaming first. New foam is coated on the day it is sprayed, no primer.
A coating job when
- Existing coating worn but foam surface intact
- Texture smooth to orange peel
- Foam dry and adhered on core samples
- New foam coated on the day it is sprayed
Not a coating job when
- Popcorn or treebark texture across the field — scarf and re-foam first
- Saturated foam on core cuts
- Bird pecking or mechanical damage into the foam
Not sure? Send photos and a core cut. A rep will call it.
The build-up, in order.
The standard SPF topcoat: high solids, one product, and it does not mind the ponding that shows up on foam roofs.For well-drained foam roofs where reflectivity and cost lead. Two coats, applied at right angles.
Clean & prep
Wash and let the foam dry. Cut and fill damaged areas with fresh foam. Scarf and re-foam any field past verge of popcorn.
New foam pass
Optional · offOne-inch lift of 3004 over a prepared roof, for re-foam jobs or added R-value. Coat it on the day it is sprayed.
3004 Roofing Foam1-in lift · 3,400 bd ft per set · rule of thumbDetails
Mastic at penetrations, drains and terminations. Foam self-flashes the curbs, so seams are not the issue here.
Si790 Silicone Mastic1 gal / 60 lin ftTopcoat
Two passes at right angles. Rougher texture takes more per square — the estimator allows for it.
Si750 Silicone Roof Coating15.4 dry mils per gal / 100 ft²Walkways
Around units and along service paths, set into wet topcoat and clipped at the corners.
GripTite Walkway Pad Walkway ProtectionSized to layout
Clean & prep
Wash and let the foam dry. Cut and fill damaged areas with fresh foam. Scarf and re-foam any field past verge of popcorn.
New foam pass
Optional · offOne-inch lift of 3004 over a prepared roof. Coat it on the day it is sprayed.
3004 Roofing Foam1-in lift · 3,400 bd ft per set · rule of thumbDetails
Fibered mastic at penetrations, drains and terminations.
Ac595 Acrylic Mastic1 gal / 40 lin ftTopcoat
Second full coat at right angles to the first.
Ac550 Acrylic Roof Coating8.5 dry mils per gal / 100 ft²Walkways
Around units and along service paths, set into wet topcoat and clipped at the corners.
GripTite Walkway Pad Walkway ProtectionSized to layout
- 04 · TopcoatSi750
- 03 · DetailsSi790
- Substrate · Spray polyurethane foam
Thickness not to scale. Optional steps appear here when switched on in the estimator below.
Rough quantities for this roof.
Enter the roof and get gallons and containers for the route above. It is a planning number, not a bill of materials — your rep confirms coverage before anything ships.
Estimate
25,000 ft² · 30 dry mils · silicone- 03Si790 Silicone MasticDetails · 10 penetrations3 gal2 × 2-gal pails
- 04Si750 Silicone Roof CoatingTopcoat · 30 dry mils536 gal9 × 55-gal drums + 9 × 5-gal pails
- 05GripTite Walkway Pad Walkway ProtectionWalkways · Rolls and clipsSized to the layout — your rep quotes it
Liquid product, all steps539 gal
- Smooth surface: no texture allowance
- 10% overage on every liquid product
- Quantities rounded up to whole gallons, then to full containers
- Si790 at 1 gal / 60 lin ft of seam, 0.25 gal per penetration — rule of thumb
- Si750: 15.4 dry mils per gal / 100 ft² — TDS; 30 mils this coat
Rough estimate for planning. Actual coverage depends on surface porosity, texture, application method and verified mil thickness. Confirm with the TDS and your rep before ordering.
Estimate
25,000 ft² · 32 dry mils · acrylic- 03Ac595 Acrylic MasticDetails · 10 penetrations4 gal1 × 5-gal pail
- 04Ac510 Acrylic Roof CoatingBase coat · 16 dry mils500 gal9 × 55-gal drums + 1 × 5-gal pail
- 05Ac550 Acrylic Roof CoatingTopcoat · 16 dry mils518 gal9 × 55-gal drums + 5 × 5-gal pails
- 06GripTite Walkway Pad Walkway ProtectionWalkways · Rolls and clipsSized to the layout — your rep quotes it
Liquid product, all steps1,022 gal
- Smooth surface: no texture allowance
- 10% overage on every liquid product
- Quantities rounded up to whole gallons, then to full containers
- Ac595 at 1 gal / 40 lin ft of seam, 0.3 gal per penetration — rule of thumb
- Ac510: 8.8 dry mils per gal / 100 ft² — SESCO build-up rate (the TDS states 9); 16 mils this coat
- Ac550: 8.5 dry mils per gal / 100 ft² — from 53% volume solids (the TDS states no dry-mil yield); 16 mils this coat
Rough estimate for planning. Actual coverage depends on surface porosity, texture, application method and verified mil thickness. Confirm with the TDS and your rep before ordering.
Case studies.
Case studies are on the way.
The data sheets for this route.
Published TDS and SDS for the silicone route. Ask your rep for any sheet not listed; the spec letter comes from your rep.Published TDS and SDS for the acrylic route. Ask your rep for any sheet not listed; the spec letter comes from your rep.
Order through your rep.
Reps confirm coverage and write the spec letter. Send the estimate, or call 1-812-776-6727.