Can GAF Shingles Be Installed Over Existing Shingles? Yes, GAF shingles can be installed over existing strip shingles, T-lock shingles, wood shingles, laminated shingles, and other asphalt premium shingles. This can be a cost-effective solution for homeowners looking to upgrade their roofs without a complete tear-off. What Is Required to Roof Over Existing Shingles? For…
What Are Metal Flashings? Metal flashings are critical components of an asphalt shingle roofing system. These include drip edge, rake edge, ridge vent, valley, step, base, and counterflashings. They are installed at roof terminations, junctions, and penetrations to divert water down the roof plane(s) into gutters, downspouts, and away from the structure, helping to prevent…
What Is the Concern? For asphalt shingle roofs, proper step flashing is crucial to prevent water infiltration and ensure the longevity of the roofing system. GAF’s standard step flashing instructions require step flashing to extend a minimum of 5 inches (127 mm) up the wall and a minimum of 5 inches (127 mm) out onto…
What Are Visual Inconsistencies? Visual issues with a shingle roof system are usually noticeable only during certain lighting conditions. Most visual inconsistencies do not affect the roof’s performance but may raise some aesthetic concerns. Two common issues are shading and telegraphing. What Is “Shading”? Shading occurs when a roof is viewed from different angles and/or…
Can I Reclaim Water (Collect Water for Use) Run-off from My Roof? Yes, you can reclaim water run-off from your roof, but it should only be used for lawn, shrubbery, and flower irrigation. Water run-off from asphalt shingles is not FDA approved for potable water reclamation or agricultural use. What This Means Because reclaimed water…
