When applying corrugated sheet metal roofing, how many corrugations should be included in the side laps?

When applying corrugated sheet metal roofing, including 1 1/2 corrugations in the side laps is important for ensuring proper water drainage and preventing leaks. This overlap allows for adequate coverage, ensuring that water runs off effectively without seeping through the seams. The 1 1/2 corrugation overlap also provides sufficient strength to resist wind uplift and enhances the overall structural integrity of the roofing installation.

Choosing fewer than 1 1/2 corrugations could compromise the leak-proof nature of the installation, as there might not be enough overlap to block water from entering at the joints. On the other hand, opting for more than 1 1/2 corrugations could be unnecessary, leading to wasted material and potentially complicating the installation process without gaining additional benefits. Therefore, the specified overlap is the optimal choice for achieving both durability and effective performance in corrugated metal roofing.