This product helps provide an extra layer of protection between your shingles and your roof deck (not included).Asphalt saturation to help improve waterproofing ability to help prevent wind-driven rain and water from other sources from infiltrating under your shingles and causing damage to your roof structure or the inside of your home.Covers 432 square feet.

This product helps provide an extra layer of protection between your shingles and your roof deck (not included).Asphalt saturation to help improve waterproofing ability to help prevent wind-driven rain and water from other sources from infiltrating under your shingles and causing damage to your roof structure or the inside of your home.Covers 216 square feet .

This prouduct is highly durable and sands easily.This is primarily used for interior applications.