FOAMULAR® CW15 Extruded Polystyrene Insulation

ASTM C578 Type X, 15 psi, 1.3 pcf density

Foamular CW15

Designed for masonry cavity wall applications, unlike some rigid foam insulation, FOAMULAR® extruded polystyrene insulation is virtually impervious to moisture. This moisture-resistant property – along with its high R-value, light weight, competitive price and wide range of sizes – makes it ideal for use in a cavity wall system. FOAMULAR® XPS extruded polystyrene insulation CW15 offers:

  • Highly stable R-value for predictable insulating performance.
  • Pre-cut 16" wide boards yield fast, labor-saving installation.
  • “Split-Pak” packaging keeps boards clean and dry on jobsite.
  • Outstanding moisture resistance.
  • Meets ASTM C578 Specifications.

Owens Corning’s FOAMULAR® extruded polystyrene insulation is an ENERGY STAR® qualified product.

Thickness Width / Length Edge Type
 1", 1½", 2", 2½", 3"
 16" x 96"    Square  
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Other sizes/edge configurations may be available with minimum order.

We recommend FOAMULAR® CW15 Extruded Polystyrene Insulation for the following applications:


Product Overview