Cavitymate™ XPS Insulation is a Styrofoam™ Brand XPS solution designed just for cavity walls, conveniently sized to fit between wall ties. All Cavitymate™ products resist moisture in all forms and help prevent moisture (condensation) from forming in cavity walls. Achieve even higher insulating power in cavity walls with Cavitymate™ Ultra, featuring 5.6 R-value per inch and designed to fit snug between brick wall ties. Cavitymate™ Ultra is used in the Ultra Wall System, a systematic way to integrate the air barrier and moisture barrier into one integrated wall system.

Cavitymate™ Insulation

Technical Data Sheet


  • For commercial cavity wall applications
  • ULTRA: Special 16″ (400 mm) width to easily fit between brick ties in cavity wall applications


  • Easy to fit snugly into cavity walls
  • High moisture resistance
  • Durable
  • Excellent thermal performance
  • Minimum compressive strength of 15 psi
  • ULTRA: 5.6 R-value per inch
  • Features integrated air and water barrier when used in the Ultra Air
  • Barrier Wall System
  • Contains an average of 20% pre-consumer recycled content certified by UL Environment Inc.