Westman Steel: Platinum Underlayment

WESTMAN STEEL’S PLATINUM synthetic roof underlayment is the new generation of roof protection, and is among the safest, strongest, and best-performing on the market. With its GRIPSPOTTM Technology, these panels offer the ultimate anti-slip protection. Woven of heavyweight polymer fabric, it offers superior strength and durability, a wrinkle-free surface and a strong resistance to UV-breakdown.

GRIPSPOTTM TECHNOLOGY is your ultimate protection on the roof, working in any weather condition. With its raised fibrous spots for traction and smooth channels for shedding water, this material provides outstanding slip resistance. PLATINUM is light-weight, easy to carry and pliable under extreme temperatures and stays put with its non-slip underside coating. All of these features combined with its print design result in easier, faster and more accurate installations. PLATINUM can be used in most types of installations, whether they are commercial or residential. It can be used with metal, wood, and asphalt shingles, and slate or concrete tiles.


APPLICATIONS | Westman Steel’s PLATINUM underlayment lays very flat and installs quickly, easily and with less risk. It’s lighter, stronger and covers more area.

SAFER | GRIPSPOTTM TECHNOLOGY features a combination of raised round/square spots of specially designed fibers and lower separating channels to provide an uneven surface for optimum traction.

STRONGER | Surpasses Type 15lb or 30lb felt in strength testing, making it more resistant to tearing and stretching around fasteners in high traffic areas or during high winds.

LIGHTER | Lightweight rolls make it easier to handle during all stages of installation.

COVERAGE | Offers 5x more coverage per roll than type 30lb felt.

WARRANTY | 40 year limited warranty. Ask your Westman Steel representative for more details.

ROLL SIZE | 4′ x 250′

COVERAGE | 1000 square feet per roll (based on a 4” Horizontal overlap and 6” vertical overlap).

EARTH-FRIENDLY | Does not contain asphalt and is 100% Recyclable water-resistant polyolefin construction.

Breaking Strength MD ASTM D 5034 MD 130.1 lb (59.0 kg)
Breaking Strength CD ASTM D 5034 CD 107.3 lb (48.7 kg)
Tear Strength MD ASTM D4533 MD 60.4 lb (27.4 kg)
Tear Strength CD ASTM D4533 CD 52.6 lb (23.9 kg)
Water Shower Exposure ASTM D 4869 Pass
Permeability ASTM E96 <0.05 Perms
Nominal Thickness ASTM D1777 20 mils

MD = Machine Direction CD = Cross Machine Direction


ASTM D 226 Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing CSA A 123.3 Asphalt Saturated Organic Roofing Felt

CAN/CSA-A220.1 Installation of Concrete Roof Tiles

ASTM E 108 Class A: Standard Test Methods for Fire Tests

of Roof Coverings ICC-ES AC188 Acceptance Criteria for Roof Underlayment INTERTEK CCRR 1028 Code Compliance Research Report ASTM D4869 Standard Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope Roofing (Water Transmission)

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