Felt underlayment on tile roofs with a pitch of 4:12 or greater should have a minimum headlap of how many inches?

For tile roofs with a pitch of 4:12 or greater, a minimum headlap of 2 inches is required for felt underlayment. This specific measurement is critical because it helps ensure that water can properly drain off the roof and that the underlayment effectively redirects any water that gets under the tiles back to the outside. The 2-inch headlap provides a sufficient overlap to minimize the risk of water penetrating the seams of the underlayment, which is crucial for maintaining the integrity of the roofing system. Adequate headlap is particularly important on steeper roofs, as they are more susceptible to water flow and potential leaks. This standard is in accordance with building codes and best practices for roofing to ensure durability and water resistance.