What is the minimum headlap required for felt underlayment on tile roofs with a pitch of 4:12 or greater?

The minimum headlap required for felt underlayment on tile roofs with a pitch of 4:12 or greater is indeed 2 inches. This specification is crucial to ensure that water is effectively directed away from the roof. Headlap refers to the amount of overlap between successive layers of underlayment, and having an adequate headlap prevents moisture intrusion under the tiles.

A minimum headlap of 2 inches provides sufficient coverage to ensure that wind-driven rain or moisture does not seep through the joints of the underlayment, which is essential for maintaining the integrity of the roofing system and preventing leaks. This is especially important for slopes of 4:12 or greater, where the likelihood of water accumulation and potential flooding behind the tiles can occur if the headlap is inadequate.

Understanding this requirement helps ensure that roof systems are installed correctly and that their performance is optimized in various weather conditions.