![Roofers on top of commercial roof](/-/media/images/mastheads/masthead/masthead-image/gaf/roofing-materials/silicone_over_metal_masthead.png?width=4114)
Roof Restoration: Silicone over Metal
Protect against metal roof leaks
![Roofers on top of commercial roof](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/card_silicone-metal-intro-1/dsc_1043-1.png?as=0&width=764&hash=1EF674B384A440D188EB422A07231B75)
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
Learn about warranty and guarantee coverage
Warranty info5 steps to restoring metal roofs with GAF Silicone Roof Coatings
![Contractor with brush on metal roof](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/feature_metal-install-1/gaf_com_atlantaga_coatings_6719-2048x2048-1/gaf_com_atlantaga_coatings_6963.png?as=0&width=764&hash=FE11D93E209C10349E3B76F396441AF2)
1. Qualify the metal roof
- Ensure the roof is clean, dry, and tight
- Conduct adhesion test to ensure proper coating adhesion
![Contractors preparing roof for coatings](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/feature_metal-install-2/gaf_com_atlantaga_coatings_6963-2048x2048-1.png?as=0&width=764&hash=07164FA3B00FF6A15FB5FC85D652F863)
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
![Roofing contractor treating seams](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/feature_metal-install-3/gaf_com_atlantaga_coatings_7303-2048x2048-1/cropped-gaf_com_atlantaga_coatings_7303-2048x2048-1.png?as=0&width=764&hash=9236C3081D33293C285C8F7817AAC17C)
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
![Contracting treating penetrations before coating](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/feature_metal-install-4/gaf_com_atlantaga_coatings_7445-2048x2048-1.png?as=0&width=764&hash=210AB7F84EFAC1E38F8116C81530E388)
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
![Roofing contractor spraying coating on flat roof](/-/media/images/content/cta-row-with-image/row-image/gaf/roofing-materials/feature_metal-install-5/gaf_com_atlantaga_coatings_8574-1.png?as=0&width=764&hash=D5846C3804BA24AE077A6A052F5907BB)
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
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