What is the minimum overlap required when installing roll roofing?

The minimum overlap required when installing roll roofing is 2 inches. This overlap is crucial for ensuring that the roofing material properly seals against the elements, which helps prevent water from infiltrating beneath the roofing layers. A 2-inch overlap provides enough surface area to form a secure bond between successive rolls, mitigating the risk of slippage and enhancing the overall durability of the roofing system.

Using less than 2 inches could lead to insufficient coverage, making the roof vulnerable to leaks. Overlapping more than the minimum requirement might not necessarily provide significant additional benefits and can also lead to the accumulation of excessive material, which could complicate installation and increase costs. Therefore, 2 inches strikes a balance between effective waterproofing and practicality in installation.