atlas underlayment bodyAtlas Roofing Corp.’s SUMMIT® Synthetic Underlayment for steep-slope roof applications is designed for a long anticipated open time before the roof covering is installed. The synthetic underlayment is manufactured from an inorganic, lightweight, and extremely strong woven polypropylene fabric, and has UV and water resistive coatings. It is unaffected by exposure to water and sunlight for at least 6 months, protecting the structure throughout the roofing project. It has good walking traction, and is able to hold fasteners very well. The product’s UL Classification demonstrates conformance to critical fire testing requirements. For more information, visit