Answer :
Final answer:
GAF advises securing step flashing to the decking instead of the sidewalls to ensure efficient water drainage and to prevent water damage, while avoiding potential leakage points and preserving the structural integrity.
Explanation:
GAF (General Aniline & Film) recommends fastening step flashing to the decking rather than to the sidewalls to allow for proper water drainage and to prevent potential water damage. This technique ensures that any water that gets behind the siding or penetrates the roof covering is directed away from the wall and onto the roof surface, where it can be safely channeled away.
Moreover, by not fastening the flashing to the sidewalls, the risk of creating holes that can become leakage points is minimized. The use of step flashing is essential in protecting the junction between the roof deck and walls, which is prone to water intrusion if not properly shielded. This method is also important for the maintenance of structural integrity of both the roofing system and the building’s frame.
