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Roof Restoration: Silicone over Asphaltic
Silicone roof coating protects against leaks
Featured silicone coating solutions for asphaltic roofs
Learn about warranty and guarantee coverage Warranty Info
5 steps to restoring asphaltic roofs with GAF Silicone Roof Coatings
1. Qualify the roof
- Ensure the asphaltic roof is clean, dry, and tight
- Perform moisture scan/identify all wet areas
- Conduct adhesion test to ensure proper adhesion of coating
2. Prep the substrate
- Replace any wet membrane and insulation with like material
- Power wash the roof using GAF Cleaning Concentrate
3. Prime the roof
- Apply a bleed-blocking primer to encapsulate and negate any asphaltic bleed-through
- Apply GAF Multi-Purpose Primer at a rate of 0.66 – 1.0 gallons per square for smooth surfaces; 1.0 – 1.3 gallons per square for granulated surfaces
4. Detail seams, flashings, and penetrations
- Treat all seams using GAF Silicone Mastic
- Tight seams: apply GAF Silicone Mastic at a rate of 160 linear feet per gallon
- Loose seams: must be three-coursed with GAF Silicone Mastic and 6” GAF Premium Fabric
- Three-course loose seams at a rate of 75 linear feet per gallon - Treat all curbs, penetrations, and drains with GAF Silicone Mastic and 12” GAF Premium Fabric
- Three-course at a rate of 160 linear feet per gallon
5. Coat the roof
- Apply GAF Unisil Silicone and GAF Unisil High Solid Silicone per the specifications for a 10/15/20-year limited warranty or guarantee1
- GAF silicone can be brushed, rolled, or spray-applied - GAF Unisil Silicone will require a minimum of two coats
- GAF Unisil High Solid Silicone can be applied in one or multiple coats
- For one-coat systems ensure the roof is 2:12 slope or less
- Apply at a maximum of 2 gallons per square - Consistently check wet mil thickness for uniform coverage
Roof coating options for every type of roof restoration
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