Summit® 60 Synthetic Underlayment

Summit® 60 is a lightweight, synthetic roof underlayment designed as an alternative to #15 asphalt saturated felt. This shingle underlayment features a woven polymeric scrim for increased strength and reduced slippage between underlayment and the roof sheathing. A textured top surface fabric improves walkability during installation. Also, the synthetic roof underlayment is highly resistant to tear, whether it is by walking on it or UV breakdown.

Summit® 60 synthetic underlayment can be mechanically fastened to several different substrates, making it an excellent underlayment for new and re-roofing applications. Also important, Summit® 60 synthetic roof underlayment is offered in 10 square rolls providing more coverage per roll than traditional felt. And for added ease, Summit® 60 synthetic underlayment is manufactured with pre-printed lay lines for easy installation.

Synthetic roof underlayment is built to provide a secondary weather barrier to help fortify your roof from wind-driven rain or simple exposure to the elements. Which is why Summit® 60 synthetic underlayment is designed to enhance the life of the roof and qualifies as an Atlas Signature® System Component. Equally as important, this moisture resistant synthetic underlayment is a water barrier built to give you peace of mind as it stands strong when you need it the most. For more information, reach out to an Atlas sales rep to learn how Summit® 60 synthetic roof underlayment can help fortify your home.

Synthetic Roof Underlayment Benefits:

synthetic underlayment

  • Meets ASTM D6757, Inorganic Shingle Underlayment Standard
  • 60-Day Exposure To UV
  • Unique Top Surface Fabric Allows for Enhanced Walkability
  • Slip Resistant Polymer Coating Applied To Bottom Surface Designed To Reduce Slippage
  • Lays Flat
  • Water Resistant
  • Performance Characteristics Exceed ASTM D4869 & D226

Summit® 60 Installation Instructions

Summit® 60 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® 60 properly. To secure, follow along the indicated fastener placement lines at the top and bottom to space fasteners at 9" o.c. horizontally. Then, follow along the indicated center lines to space fasteners at 12" 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 in the surface of the Summit® 60, being careful not to cut into the sheet. If any damage to Summit® 60 occurs, it must be repaired before continuing on to the next step. Peel and stick flashing tape (or equivalent) can be used to repair seams, joints, and tears. Cold applied adhesives may be used at this point to supplement seal joints, flashings, and overlaps.

For best results, Summit® 60 should be extended at least 12" past all hips and valleys. Summit® 60 is recommended for use on 4:12 to 7:12 roof slope. If Summit® 60 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.