End laps refer to the overlapping of two roofing panels at the end of a roof run where the panels meet the edge of the roof or intersect with another panel. This is done to ensure that the panels are securely fastened together and to prevent water from penetrating through the seam.
End laps are a common technique used in metal roofing and are necessary because roofing panels typically come in standard lengths that are shorter than the length of the roof. To cover the entire roof, multiple panels must be installed, and end laps are used to join the panels together at the ends.
The specific details of end laps can vary depending on the type of roofing material and the design of the roof. In general, the panels are overlapped by a certain distance, with one panel placed over the other, and are fastened together using screws or other fasteners. The edges of the panels may be folded or crimped to create a stronger, more weather-tight seal.
Proper installation of end laps is important for ensuring the long-term durability and weather resistance of the roof. End laps should be installed in accordance with the manufacturer’s recommendations and local building codes to ensure that they meet required standards for strength and water resistance. Improperly installed end laps can lead to leaks, damage to the roofing material, and other problems over time.