<p>This #15 Felt Roof Deck Protection features quality asphalt saturation for great waterproofing to add an extra layer of protection between your shingles and your roof deck.</p> <br /><br /><ul><li>#15 Felt type construction helps provide an extra layer of protection between your shingles and your roof deck (not included)</li><br /><li>Heavy-duty felt design lays flat and minimizes wrinkling</li><br /><li>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</li><br /><li>Slip-resistance for safety in warm climates</li><br /><li>Accurate lay lines for easy, consistent shingle application</li></ul>