THERMglass Type IV:

THERMglass Type IV

A High Performance Fiberglass Type IV Ply Sheet

THERMglass Type IV is a ply sheet that is used within a built-up roofing system for application over preformed rigid insulation or base sheets.  It may be used with Premium III or Premium IV Hot-Melt Adhesive, or where an extra level of performance is required, POWERply Modified Hot Melt Adhesive.


The heavy duty THERMglass Type IV consists of a non-rotting glass ply sheet that exceeds ASTM D 2178, Type IV.

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