Summit® Synthetic Underlayment

Summit® synthetic underlayment is constructed with lightweight, extremely strong, woven polypropylene fabric, containing UV and water resistive coatings. This synthetic roof underlayment is packaged for convenience in 10 square rolls, weighing approximately 30 lbs. each. It is UL 790 compliant for fire resistance and 180-day UV exposure. A unique manufacturing process allows us to coat both the face and back surfaces of Atlas Roofing’s synthetic underlayment, creating dual-coated slip-resistant protection.

An inorganic, high-strength, woven fabric based roof system component appropriate for use in virtually all steep slope roof covering systems. Summit® synthetic roof underlayment is fully compatible with asphalt shingles, metal roof coverings, clay tile, slate, concrete tiles, wood shingles and shakes, or any other code approved, steep slope roof covering. The UL Classification demonstrates conformance to critical fire testing requirements. For specific details on how Atlas Roofing’s synthetic underlayment can best protect your home, contact a sales rep today.

synthetic underlayment


  • 6x Lighter Than #30 Felt
  • Maximum Tear Strength For Peace Of Mind
  • Dual-Coated Slip-Resistant Resin Provides Traction On The Deck And Unique Surface Walkability
  • Monolithic UV Coating Allows For 180-Day UV Exposure
  • Water Resistant - Will Not Wrinkle Or Buckle
  • Extreme Temperature Performance -40°F to 240°F

SUMMIT® Installation Instructions

SUMMIT® shall be applied to properly ventilated, building code approved roof decks. Before getting started, be sure the roof deck is clean, solid, properly fastened, and free of voids and/or damages.

Begin by unrolling the underlayment from left to right, noting that the printed side should be facing up for installation.

Plastic cap fasteners, with a 1" minimum length and 1" minimum cap diameter, must be used to secure SUMMIT® properly. To secure, follow along the indicated fastener placement lines at the top and bottom to space fasteners at 12" o.c. horizontally. Then, follow along the indicated center lines to space fasteners at 24" o.c.

When more than one piece is required to continue a course, overlapping is necessary. The overlaps at the top and bottom should be a minimum of 4". The fasteners should be placed 2" in from the edge of the top and bottom laps. The end overlaps should be 12" minimum and fastened vertically at 12" o.c., staying 2" in from the end of the top layer.

The plastic cap fasteners should be driven tightly into the surface of the SUMMIT®, being careful not to cut into the sheet. If any damage to SUMMIT® occurs, it must be repaired before continuing on to the next step. Atlas WRB peel and stick flashing tape (or equivalent) can be used to repair seams, joints, and tears. Asphalt adhesives may be used at this point to supplementally seal joints, flashings, and laps.

For best results, SUMMIT® should be extended at least 12" past all hips and valleys. If SUMMIT® is being installed on decks with less than 4:12 slopes, it should be applied in a double coverage method. Here, the overlap of each installed course should be 24", rather than the normal 4". It is acceptable to drive the fasteners through both layers to secure.

Always follow the ARMA (Asphalt Roof Manufacturing Assn.) recommendations for installing shingle underlayments and flashings for best roofing practices.


Always learn and observe safe roofing practices according to OSHA and local building code requirements. Always use caution when walking on sloped roof decks and SUMMIT® underlayments. Do not walk on unsecured SUMMIT® or any other loose roofing material lying on sloped roof decks. Dust, dew, water, or debris creates unsafe conditions on the roof. The presence of any foreign matter may drastically change the coefficient of friction (traction) on SUMMIT® or any other material on a sloped roof deck. Failure to always use proper safety equipment and footwear can result in serious injury or even death.