Mid States 36 In. x 36 Ft. White Asphalic Coated Fiberglass Mat-2 Sides Asphalt Roofing Membrane

Fiberglass mat, coated on both sides with asphaltic coating, surfaced with mineral granules on 1 side. Provides an extra layer of protection between your shingles and your roof deck. Asphalt saturation for effective waterproofing. Accurate lay lines for simple, consistent shingle application. Slip-resistant, even in warm climates. Economical roofing underlayment.