Roof underlayment is the last line of defense that protects a home from serious damage if a roof covering is blown off or damaged in a storm. Summit® 180 synthetic underlayment by Atlas Roofing offers many advanced benefits not available with conventional felt. It is an approved underlayment for both new and re-roofing applications and can be used with most types of code-approved steep-slope roof coverings, including metal. 
On certain roof projects, underlayment may face a long exposure time from the dry-in to the completed roof covering. Atlas developed Summit® 180 with performance characteristics that ensure its reliability during extended uncovered exposure to damaging ultraviolet rays. This lightweight, extremely strong, polypropylene fabric contains UV and water-resistant coatings that allow for up to 180 days of open exposure before being covered. 
Summit® 180 can withstand extreme temperatures from -40 F to 240 degrees F. Unlike conventional saturated felt, Summit® 180 is not prone to wrinkling or buckling. This allows it to lie more flat, which helps a roof protect against invasion from water. 
“Summit® 180 has many great benefits. It is light weight and extremely durable,” said Paul Casseri, product manager for Atlas Roofing’s residential division. “It weighs six times less than #30 saturated felt, yet has greater tear strength that allows it to remain exposed for a long time if necessary.” 
Roofing crews benefit from a textured, wrinkle-free top surface and a slip-resistant coating applied to both the face and base surfaces of this underlayment. This dial coating slip resistance provides improved grip to allow safer walkability during installation. 
Summit® 180 synthetic underlayment exceeds ASTM D226 Type I and Type II, the standard specification for asphalt saturated felt. It has earned ASTM D6757, the inorganic shingle underlayment standard. It is also UL 790 compliant for fire resistance. 
Summit® 180 roof underlayment is packaged for convenience in 10 square rolls weighing approximately 30 pounds each. For more information, visit