Styrofoam™ Brand Cavitymate™

Commercial | Residential | Multifamily | Wall

Insulation made to keep moisture out

Cavitymate™ XPS Insulation is a Styrofoam™ Brand XPS solution that’s conveniently sized to fit between wall ties.


Styrofoam™ Brand Cavitymate™

An extruded polystyrene foam insulation board with square edges on all four sides. Special 16” width makes it easy to fit between brick ties in cavity wall applications.


Features & benefits

Lightweight and durable
  • Easy to handle, cut and install
  • Helps save time and money on site
  • Closed-cell structure
  • High moisture resistance
  • Keeps cavity temperature above dew point to prevent condensation
  • Long-term thermal performance
  • Convenient size
  • Easy to fit between brick ties
  • Meet all wet cavity needs

    Physical Properties

      Method Unit Value
    Thermal Resistance per inch (25 mm) @ 75°F (24°C) mean temp.<sup>1</sup> C518 ft2•h•°F/Btu. R-value, min. 5
    Compressive Strength<sup>2</sup> D1621 psi (kPa), min. 15 (103)
    Flexural Strength<sup></sup> C203 psi (kPa), min. 40 (276)
    Water Absorption<sup></sup> C272, D2842 % by volume, max. 0.3
    Water Vapor Permeance<sup>3</sup> E96 perm (ng/Pa•s•m2 ), max. 1.5 (90)
    Coefficient of Linear Thermal Expansion<sup></sup> D696 in/in•°F (mm/m•°C) 3.5 x 10-5 (6.3 x 10-2)
    Maximum Use Temperature<sup></sup> - °F (°C) 165 (73.8)

    1Values are consistent with the criteria of ASTM C578 and the requirements of the FTC R-value rule (16 CFR Part 460). R means resistance to heat flow. The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-value.

    2Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first. Since Styrofoam™ Brand Extruded Polystyrene Foam Insulations are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep and fatigue deformation. For static loads, 3:1 is suggested. For dynamic loads, 10:1 is suggested.

    3Based on 1” (25 mm) thickness.


    Available Sizes

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