The Roof Store Ice and Water Shield Self Healing Waterproofing Membrane 80 mils is a SBS/APP Modified bitumen self adhered waterproof membrane that is self healing by sealing itself around a perforation. to 32 degrees Fahrenheit to 194 degrees Fahrenheit. This product is Non-Granulated and it is not designed to grip well while standing on it, so use proper harnessing equipment. Install this roof component at every roof perforation (vents and pipe boots), at every edge of the roof, and anytime the roof area meets a wall or an edge to waterproof your roofing project. The Roof Store Ice and Water Shield Self Healing Waterproofing Membrane is the most crucial component that will help prevent future roof leaks from roof penetrations (pipe boots and vents). 2.0mm thickness (80 mils) Each rolls = 88 pounds. Measures: 3.28 ft wide x 49.21 ft in length