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Extruded Polystyrene – XPS

With its extruded polystyrene (XPS) construction, this board does not absorb water, is not a food source for mold, and is not subject to moisture-related damage and deterioration. An R-Value of 5.0 per inch of thickness makes it an excellent thermal insulator that increases the energy efficiency of your structures.  The board also provides an extra barrier against moisture infiltration. XPS is available with square edge  and an interlocking shiplap edge that helps reduce energy-robbing air leaks at seams and gaps.

XPS Insulation Board is ideal for a variety of applications, including below slab, below grade, inside basement walls, exterior insulation over wood sheathing, and residing.


Like many construction materials, XPS insulation is combustible and may constitute a fire hazard if improperly installed. These products should not be left exposed in the interiors of buildings where people reside, work or assemble. An approved thermal barrier, such as  gypsum board or its equivalent, should be mechanically attached over the foam in interior applications. Recommendations of fire and building codes should always be followed.

The uniquely resistant and durable qualities, inherent to extruded polystyrene foam, make XPS one of the most dependable long-term insulation materials available.

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