Do NOT fasten shingles directly to insulation or insulated deck unless authorized in writing by GAF. Roof decks and existing surfacing material must be dry prior to application of shingles. • UNDERLAYMENT (LEAK BARRIER): Install GAF leak barrier at the eaves in localities where leaks may be caused by water backing up behind ice or debris dams.. Browse GAF\u0027s Document Library offering residential and commercial roofing reference materials on shingles, system components, warranties, data sheets and more. Go to main content English (US)
GAF- Mastering The Roof (chapter 11)This video demonstrates the proper installation technique for Timberline® Shingles.Before we go further, I want to make a.. A basic demonstration for roofing contractors and homeowners on how to install GAF Timberline HD Shingles. Learn more at https://www.gaf.com/en-us/products/t.