The True Purpose Of Underlayment Provides an extra layer of protection between your roofing shingles and roof deck Prevents wind-driven rain... (or water from other sources) from infiltrating under your shingles and causing damage to your roof structure or the inside of your home Provides an extra layer of protection... Between your shingles and your roof deck Lays flatter... And will not buckle when installed Helps reduce blow-off... By allowing your shingles to lay flatter and more uniformly Contact Us Today For More Information Metal Valley Traditional #15 Felt Underlayment Synthetic Underlayment Ice Guard
