Designed with grooves to lock into the next sheet, Styrofoam™ Brand Tongue and Groove Foam Insulation is easy to install and lightweight while providing moisture resistance and thermal efficiency.
Styrofoam™ Brand Tongue and Groove Extruded Polystyrene Foam Insulation (XPS)* features tongue and groove edges on all four sides of 2’ x 8’ boards 1” thick or less and on the long edges of all other boards. The lightweight, moisture-resistant and thermally efficient Type IV extruded polystyrene foam insulation is suited for a wide range of residential and commercial construction applications.
* Styrofoam™ Brand Tongue and Groove Insulation is a former product of The Dow Chemical Company
|Lockable edges speed installation||
|Thermal Resistance1 per inch @ 75°F mean temp. @ 40°F mean temp. @ 25°F mean temp.1||ASTM C518||ft2 •h•°F/Btu, R-value, min.||5.0|
|Compressive Strength2||ASTM D1621||psi, min.||25|
|Water Absorption||ASTM C272||% by volume, max.||0.3|
|Water Vapor Permeance3||ASTM E96||perm, max||1.5|
|Maximum Use Temperature||-||°F||165|
|Coefficient of Linear Thermal Expansion||ASTM D696||in/in•°F||3.5 x 10-5|
|Flexural Strength||ASTM C203||psi, min.||50|
1 R means resistance to heat flow. The higher the R-value, the greater the insulating power.
2 Vertical compressive strength is measured at 10 percent deformation or at yield, whichever occurs first. Since Styrofoam™ Extruded Polystyrene Foam Insulations are visco-elastic materials, adequate design safety factors should be used to prevent long-term creep and fatigue deformation.
3 Based on 1” thickness.
|Thickness1 (in.)||Board Size (ft.)|
|0.75||2 x 8, 4 x 8|
|1||2 x 8, 4 x 8|
|1.5||2 x 8, 4 x 8|
|2||2 x 8, 4 x 8|