Roof Restoration: Silicone over Asphaltic
Silicone roof coating protects against leaks
Stand up to ponding water with GAF Silicone Roof Coatings
Choose GAF Silicone Protective Coatings for protection against leaks due to ponding water, wide temperature application window, and tenacious adhesion when restoring existing metal, asphaltic, aged single-ply, SPF, and previously coated roofs.
Featured silicone coating solutions for asphaltic roofs
GAF Unisil High Solids Silicone Roof Coating
A high-solids, moisture-cure silicone coating that provides protection against weather elements, UV rays, and leaks due to ponding water for a variety of substrates. View data sheet
See product
GAF Silicone Mastic
A thick, high-build silicone sealant featuring low odor, an easy application, a fast moisture cure, and enhanced adhesion to a variety of substrates. View data sheet
See product
GAF Unisil Silicone Roof Coating
Provides protection against weather elements and strong adhesion to a wide range of substrates and resists ponding water. View data sheet
See product
Learn about warranty and guarantee coverage
Warranty info5 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 or 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
Download the complete installation steps
DownloadRoof coating options for every type of roof restoration
Additional Resources
Use these links to connect with the products and people you need to get the job done.
Building a better GAF Commercial around you
Contractors
We’re building new plants for greater capacity, and better systems for faster response and higher visibility.
Learn more
Architects
We’re building better, faster, more accurate access to the information you need.
Learn more
Property Owners
Whether you manage one property or 1,000, we’re building the products and programs you need to reroof, restore, or maintain your investment.
Learn more
