TRI-BUILT 250HT Self-Adhered Underlayment 36 in. x 66 ft Roll

TRI-BUILT 250HT is a self-adhered roofing underlayment supplied as a single 36 in. x 66 ft roll covering 198 sq ft (one square per roll). It is UL Classified and meets ASTM D1970 with ASTM E108/UL 790 Class A fire resistance. Install beneath shingle, tile or metal roofing as a premium leak barrier.

Key Features:

• Self-adhered membrane: The 250HT membrane self-adheres to the deck and laps for a continuous waterproofing layer.
• 198 sq ft roll: Each 36 in. x 66 ft roll provides 198 sq ft of coverage, roughly one square per roll.
• Class A fire: Meets ASTM E108/UL 790 Class A fire resistance requirements.
• ASTM D1970: Meets ASTM D1970, the standard for self-adhering polymer-modified bituminous sheet underlayments.
• Code listed: ICC-ES ESR #1556 and Florida Building Code Approved Product #6785, listed under the International Building Code.
• Green building listed: Complies with 2016 California Green Building Standards Title 24 and ICC 700 National Green Building Standard listings.

Specifications Table:

Coverage & How Much You Need:

One 36 in. x 66 ft roll covers 198 sq ft, equal to one square of roof area. Plan roll count from actual deck area, allowing for laps per the manufacturer’s instructions.

Fit and Compatibility:

Designed for use under shingle, tile and other steep-slope roof coverings where a self-adhered leak barrier is specified. Pair with TRI-BUILT flashing, sealants and ventilation components; drip edge, starter and field membrane are sold separately.

Frequently Asked Questions (FAQ):

Q: How much does one roll cover?
A: One 36 in. x 66 ft roll covers 198 sq ft, about one roofing square.

Q: What fire rating does it have?
A: It meets ASTM E108/UL 790 Class A fire resistance.

Q: Is it code approved?
A: Yes, it is UL Classified, ICC-ES ESR #1556, IBC listed and Florida Building Code Approved Product #6785.

Q: What standards does the membrane meet?
A: It meets ASTM D1970 for self-adhering polymer-modified bituminous sheet materials.

Q: How heavy is a roll?
A: Each roll weighs approximately 66 lb.

Q: What is included?
A: The sell unit is one self-adhered underlayment roll; primers, flashings and roof coverings are sold separately.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Self-adhered 250HT is the right call at eaves, valleys, ridges and penetrations where ice dams and wind-driven rain are a concern. Deck must be clean, dry and primed where required before application, and laps should follow the manufacturer’s instructions. At one square per roll, order roll count from actual deck measurements rather than plan area. Verify local code requirements for self-adhered underlayment at eaves in snow and ice regions.

Install per the manufacturer’s instructions and local building code; work on roofs only with proper fall protection.

Order the TRI-BUILT 250HT 36 in. x 66 ft self-adhered underlayment roll for your next leak-barrier installation.