Cem-Rock Extreme X4 logo in green and gray text on a white background.
Close-up of a rectangular piece of gypsum board on a reflective surface with a black background.

  • Cemrock Extreme is a smooth-faced, multi-purpose magnesium oxide (MgO) board engineered for exceptional durability and performance. This non-combustible board is ideal for applications requiring moisture resistance, thermal resistance, and fire protection. Unlike fiber cement boards, Cemrock Extreme offers superior dimensional stability and will not rot, making it a dependable choice for challenging environments.

  • Non combustible ASTM E136

    High screw/pull out resistance, no blocking required

    Up to 2 hour fire ratings

    Smooth face: Capable of achieving level 4 finish

    4 layers of high-grade fiber glass mesh for high bending strength and durability

    High impact and racking strength

    Zero chloride content

    Lighter than fiber cement and calcium silicate boards

    Easy to cut, screw and install on steel and timer frames

    Environmentally friendly

  • 4’ x 8’

    4’ x 9’

    4’ x 10’

  • 1/4”, 3/8”, 1/2”, 5/8”

  • Square

    Tapered

    Beveled

  • Grey

    White (special order)

Helpful Resources

  • Plain white textured paper surface

    Data Sheet | Cemrock Extreme

    This data sheet provides detailed specifications, performance and characteristics.

    VIEW
  • White textured paper background

    Installation Guide | Cemrock Extreme

    This document provides installation guidelines for Cemrock Extreme.

    VIEW

  • Safety Data Sheet

    The Safety Data Sheet (SDS) list all of the materials used within the Cemrock products.

    VIEW