This video shows how GAF was the leading innovator in the evolution of the laminated shingle. By... | GAF- Mastering The Roof (chapter 05) The drip edge is critical to provide a finished look and to... | GAF- Mastering The Roof (chapter 13) Flashing is used to seal and protects joints in a building... | This video demonstrates the proper installation technique for Woodland® Shingles. | Industry breakthrough! All GAF laminated shingles now carry a Lifetime Ltd. Warranty. |