THERMglass Felt:

THERMglass Felt

High Quality Fiberglass Felt

THERMglass Roofing Felt is designed for application over preformed rigid insulation and other suitable substrates in conjunction with asphalt, THERMastic 80, or THERMastic 100 where an extra level of performance is required.


THERMglass Roofing Felt is a non-rotting glass ply sheet exceeding ASTM D 2178, Type VI.

Roofing & Weatherproofing Peace of Mind

We deliver peace of mind to building owners and facility managers by managing roofing and building life cycles for customers in all industries, including education, healthcare, government, manufacturing and more.

  • Tremco Roofing offers the industry's most comprehensive roofing and weatherproofing solutions for restoration, repair, maintenance, replacement and new construction.
  • WTI (Weatherproofing Technologies, Inc., a subsidiary of Tremco Incorporated), provides roofing services, construction management and general contracting.
  • Our Canam Building Envelope Specialists affiliate provides building envelope solutions to eliminate air leaks, improve energy efficiency and reduce costs.


US: 1.800.852.6013

Canada: 1.800.668.9879