ROXUL MONOBOARD® Plus is a high-density, bitumen-coated stone wool commercial insulation board for low slope roof applications. It is used as a coverboard to provide a suitable substrate for membranes as well as additional thermal resistance. It is suitable for torch, hot mopped or self-adhered membranes. Additionally, this non-combustible insulation is highly durable, and environmentally sustainable.

It is available as 1.04” thick board to provide a R4/in at a mean 75°F, which increases at colder temperatures and decreases slightly at warmer temperatures. This can help reduce the thickness of the thermal insulation used in the rest of the roof system.



Designed for use as a commercial and industrial low-slope roof insulation cover board. It is suitable for both new building and re-roofing applications with torched, hot mopped or self-adhered membranes. MONOBOARD® Plus is also suitable for use in tapered systems and fabrication.
See Technical Data and individual product specification sheets for details.


  • Non-combustible
  • Will not warp or cup
  • Dimensionally stable
  • High impact resistance
  • Low moisture sorption
  • Non-corrosive
  • Stable R-value
  • Fire resistant
  • Excellent acoustical properties
  • Made from natural & recycled materials
  • ROXUL can contribute to earning LEED® points

Click here to estimate the effects of using ROXUL insulation on your next commercial roofing project by using our interactive Energy Cost Calculator. See how decreasing R-value affects the energy performance of your building.