Roxul TopRock Plus:

Roxul TopRock Plus

Non-combustible insulation

Roxul TopRock Plus stone wool insulation boards can be used for a variety of commercial/industrial low slope, new construction and re-roofing applications, either as a base layer and/or as a coverboard over polyisocyanurate insulation.

These rigid boards are available in monodensity (1”) or dual density (2”-6”) for enhanced point load and puncture resistance. The top surface is impregnated with a bitumen layer that is compatible with a variety of cold- or hot- applied roof membrane applications. Non-impregnated boards are also available on request.

Water repellent yet vapor permeable, TopRock Plus is also noncombustible; a melting point of approximately 2150°F (1177°C) gives it excellent fire resistance properties.  

Tremco/Roxul Toprock Plus exceeds the requirements of ASTM C726.


Stone wool is a combination of slag and basalt.  The bitumen coating enables TopRock DDPlus to be used with torched and hot-applied membranes.

Click here to learn more about the benefits of Roxul insulation. 

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