X-Treme Board™ is made of proprietary and patent pending technology.

X-Treme Board™ is made of proprietary and patent pending technology.
Ingredients include Magnesium Oxide, Magnesium Chloride as the primary components, with additional natural mineral components such as perlite, and woven and non-woven strengthening fibers.

Why Choose X-Treme Board™ for your next tile project?

X-Treme Board™ installs with conventional fasteners and can be scored and snapped with a regular utility knife. Portland cement based backer boards and fiber cement boards require special tools. Conventional screws typically will not countersink into these boards. The installer must buy special screws, or must pre drill the board to achieve countersunk fastener heads. X-Treme Board weighs 50% per square foot less than other cement boards, making it easier to handle. Remodelers who have to work in tight spaces especially appreciate X-Treme Board’s ease of installation. X-Treme Board is non-nutrient for mold and mildew, without added chemicals.

X-Treme Board™ contains NO silica.

X-Treme Board™ contains no harmful silica. Backer boards that contain silica are a health hazard to the installer. Please read our competitor’s warning labels before handling.

X-Treme Board™ will not warp, swell, delaminate or disintegrate when exposed to moisture, unlike gypsum based backer boards. Some gypsum based backer boards are manufactured with a built in vapor barrier to prevent the problem, but if the vapor barrier is compromised, the gypsum will still be affected by the moisture.

When tested under ASTM C-627, X-Treme Board™ received the highest rating of “extra heavy”, meaning it can be installed as a tile backer under the most demanding conditions like food plants, industrial kitchens, and other high impact areas.

X-Treme Board™ is the ideal backer board for tubs, showers, floors, outdoor kitchens, fireplace surrounds receiving stone or brick veneer, and much, much more.

Additional Applications

In addition to using X-Treme Board™ as a tile backer for walls and floors, it can also be used for exterior applications such as soffit cladding, as an exterior sheathing behind stucco applications when structural strength is not required for the exterior sheathing, as an interior or exterior skin for SIP panels, in homes where breathable walls are desired, for fireplace surrounds, as wall board for those who are chemically sensitive, and as a mold resistant and flame rated paneling in mobile and manufactured homes.


Technical Guide X-Treme Board 2011 (pdf)
Southern Cross 083-06 Robinson Test Report (pdf)
Southern Cross Tech Warranty (pdf)
Source By Net Declaration on X-Treme Board Recycled Content (pdf)
LEED Credits Summary (pdf)
X-Treme Board Material Safety Data Sheet (pdf)
X-Treme Board 3 part spec 1107 (pdf)
X-Treme Board 12 mm E84 Flame Test (pdf)
ASTM Sound Transmision Loss Test Report (pdf)
ASTM Fungus Test (pdf)
245299 -1182 3 Approved (pdf)