Roof Restoration: Silicone over Metal
Protect against metal roof leaks
Stand up to ponding water with GAF Silicone Roof Coatings
Choose GAF Silicone Protective Coatings for protection against leaks due to ponding water. Silicone coatings have a wide application window and tenacious adhesion when restoring existing metal, asphaltic, aged single-ply, SPF, and previously coated roofs.
Featured silicone roof coating solutions for metal 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 Multi-Purpose Primer PART A & B
A two-component, 9-to-1 ratio, water-based epoxy primer for optimizing adhesion of coatings over new and existing substrates. View data sheet
See product
Learn about warranty and guarantee coverage
Warranty info5 steps to restoring metal roofs with GAF Silicone Roof Coatings
1. Qualify the metal roof
- Ensure the roof is clean, dry, and tight
- Conduct adhesion test to ensure proper coating adhesion
2. Prep the substrate
- Make any necessary repairs to the sheet metal and secure or replace all loose or missing fasteners
- Power wash the roof using GAF Cleaning Concentrate
- Install sheet metal crickets behind rooftop units, if needed
3. Treat seams and fasteners
- Treat ridges and rake edges with a roof brush and GAF Premium Fabric embedded into GAF Silicone Mastic
- Three-course at a rate of 75 linear foot per gallon
- Seal vertical seams with GAF Silicone Mastic. Typical standing seam profiles do not require seam treatment1
- Check with GAF Technical Services or the GAF Liquid-Applied Roofing Manual - Seam Treatment Guide
- Encapsulate all fasteners with GAF Silicone Mastic
4. Detail penetrations
- Treat all curbs, penetrations, and drains with GAF Silicone Mastic and 12” GAF Premium Fabric
- Three-course at a rate of 75 linear foot 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
