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Excellent walkability Easy to chalk Trusted DuPont Tyvek quality and durability For slopes 212 and higher under asphalt shingle metal and cedar 90 day UV exposure DuPont Tyvek Protec 120 Roof Underlayment is an engineered synthetic roofing underlayment with industry-leading walkability. It is ideal for slopes 2:12 or higher and can be used under a variety of roofing materials including asphalt shingles cedar or metal roof cladding. The four-layer construction offers high performance with a slip resistant coating gripping it to the roof woven polypropylene giving it strength a water barrier layer and grooves on the top layer expelling water and dirt to provide a safer work environment. It is wrinkle-free easy to chalk protects the roof during installation as a moisture barrier and withstands UV exposure for up to 3 months. It is trusted protection that can give both professional builders and homeowners greater peace of mind. Warning: This product can expose you to chemicals which is are known to the State of California to cause cancer and birth defects or other reproductive harm.