TRI-BUILT® #30 ASTM D 226 is a widely accepted underlayment product that is manufactured from superior quality organic felt that is saturated with asphalt. Line markings are placed on the top surface at 2", 8-1/2", 11-5/16", and 17" from each side of the sheet.

TRI-BUILT® organic felts are excellent underlayments for steep-slope roofing such as 3-tab shingles, wood shakes, and tiles. In addition, these felts can be installed under all types of building materials, flooring, and siding including stucco, aluminum, vinyl, and wood. TRI-BUILT® organic felts are excellent secondary protection barriers against wind, moisture, and other environmental elements.

TRI-BUILT® provides quality residential and commercial building materials that deliver professional results. By focusing on the professional contractor, TRI-BUILT® has become a recognized and trusted leader in the construction industry. From roofing and siding materials, windows, coatings, and more, TRI-BUILT® is a name you can trust at a competitive price.