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Gorilla Guard® 30 is a high-performance engineered roof underlayment constructed to protect the roof from water.
Designed for virtually any type of roof covering, this innovative, technologically advanced product far outperforms conventional organic felt roofing underlayment. Gorilla Guard® 30 lays flatter and has significantly increased tear strength compared to traditional roofing underlayment.
Take advantage of the lighter, stronger and smoother underlayment that lives up to its name – Gorilla Guard® 30. The toughness you need to guard the place your clients call home.
Technical & Installation Details
Where To Buy
Get It Installed
For maximum protection and warranty coverage, install an Atlas Signature Select® Roofing System with components designed and backed by an Atlas Warranty.
1Atlas WeatherMaster® Ice & WaterUnderlayment
2Atlas Premium Underlayment
3Atlas Pro-Cut® Starter Shingles
4Atlas Roof Shingles
5Atlas TruRidge® & HighPoint®Exhaust Ventilation
6Atlas Pro-Cut® & StormMasterHip & Ridge Shingles
Length: 141.5' Width : 36" Square Per Roll Coverage: 4 Coverage With 2" Lap: 400 Square Feet
Meets ASTM D-6757 Meets ASTM D226, Type I(#15) Meets the performance criteria of ASTM D-4889, Type I and Type III (#15 and #30 Standard)
UL Classified as a Prepared Roofing Accessory Florida Building Code Approved - FL 17322
Learn and observe safe roofing practices according to OSHA and local building code requirements. Always use caution when walking on sloped roof decks and Gorilla Guard® 30 underlayment. Do not walk on unsecured Gorilla Guard® 30 or any other loose material lying on sloped roof decks. Dust, dew, water and debris create unsafe conditions on the roof. The presence of any foreign matter may drastically change the coefficient of friction (traction) on Gorilla Guard® 30 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.
Gorilla Guard® shall be applied to a properly prepared dry deck that is smooth, clean and free from any depressions, projections, or protruding nails. Roof decks shall be structurally sound and meet or exceed minimum requirements of the deck manufacturer and local codes.
Always lay the Gorilla Guard® parallel to the eaves, lapping each course at least 2" over the underlying course. Apply the drip edge underneath the Gorilla Guard® along the eaves and over the Gorilla Guard® along the rakes. Gorilla Guard® should never be applied perpendicular to the eaves. Secure the Gorilla Guard® with fasteners every 12" across the lower and upper edge to hold it in place. If more than one piece is required to continue a course, lap the ends at least 4". End laps in succeeding courses should be located at least 6' from end laps in the preceding course. Lap the Gorilla Guard® a minimum of 6" from both sides over all hips, ridges and valleys. Where a roof meets a vertical surface, carry the underlayment at least 4" up the surface.
On decks having a slope greater than 4" per foot, one layer of Gorilla Guard® should be applied. Some local codes may require specific underlayments. On slopes 2" to 4" per foot apply a double layer of Gorilla Guard® over the entire deck surface. Starting with a 19" wide strip at eaves, overhanging the eaves 1/4" to 3/8", cover with full 36" strips providing a 17" exposure. Continue with 36" strips lapping each course 19" over the preceding course. End laps for low slopes shall be 12" and staggered 6' apart.
The use of Gorilla Guard® along with the proper decking materials and shingles will help in meeting Class A and or Class C Fire ratings. A shingle by itself is not fire-rated, although it is part of the roofing assembly.
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