Our STS Underlayment is a self-adhering roof underlayment composed of a high-grade polyester fabric laminated to high-temperature, self-sealing, asphalt adhesive. A silicone-coated paper backing protects the adhesive and is removed during installation. STS features a 3-inch adhesive selvedge to ensure a secure, monolithic seal.

The surface fabric offers excellent traction for good footing and for stacking tiles during construction.

Additionally, the fabric helps air to circulate under the roofing and bonds well to all foam adhesives. STS meets all codes for installation in high-wind velocity hurricane zones.