Easy to handle and apply Seals around roofing nails, resisting leakage caused by water backup behind ice dams, or from wind-driven rain Resists cracking, drying out, and rotting ensuring reliable, enduring protection Protects under all standard sloped roof coverings such as slate, tile, cedar shakes, metal, and conventional asphalt shingles Has a slip resistant embossed surface to maximize traction and safety for installers Re-roofable as it can be applied over the old underlayment (except for the Grace granular underlayment) in retrofit applications Isolates metal roof components from new corrosive wood preservatives Each roll is 50 Feet long 9 Inch Roll Weight: 9.5 pounds 18 Inch Roll Weight: 19 pounds 9 Inch Roll Coverage: 37.5 square feet 18 Inch Roll Coverage: 75 square feet 9 Inch and 18 Inch Roll Thickness: 40 mils Grace, 9" x 50', Roof Detail Membrane, A Premier Membrane Based On The Grace Ice & Water Shield Technology, Used As A Flashing To Provide Resistance Against Water Infiltration At Trouble Prone Roof Detail Areas, This New Membrane Has The Unique/Patented Ripcord Feature For Easy Installation At Transition Areas & Allows For Future Tie-Ins, Composed Of 2 Waterproofing Materials: Rubberized Asphalt Adhesive Backed By Layer Of High Density, Cross Laminated Polyethylene, Seals Around Nails, Will Not Crack, Dry Out, Or Rot, Protects Under All Standard Sloped Roof Coverings, Slate, Tile, Cedar Shake, Metal, Asphalt Shingles, Slip Resistant, Shrink Wrapped Rolls.