STYROFOAM Tongue & Groove
Radiant Floors Application Information Sheet (98KB PDF)
Installation Instructions for STYROFOAM™ Tongue & Groove
STYROFOAM Tongue & Groove Sales Sheet (94KB PDF)
STYROFOAM Tongue and Groove extruded polystyrene insulation is a foam insulation board with tongue and groove edges on long edges of boards.
| Nominal Board Thickness** |
R-Value† |
Board Size |
Edge Treatment |
Min Compressive Strength†† |
| .75" |
3.8 |
2' x 8'/4' x 8'/4' x 9' |
Tongue and Groove |
25 psi |
| 1.0" |
5.0 |
2' x 8'/4' x 8'/4' x 9' |
Tongue and Groove |
25 psi |
| 1.5" |
7.5 |
2' x 8'/4' x 8'/4' x 9' |
Tongue and Groove |
25 psi |
| 2.0" |
10.0 |
2' x 8'/4' x 8'/4' x 9' |
Tongue and Groove |
25 psi |
Building Code Compliance
Complies with ASTM C 578 Type IV. Meets IBC/IRC requirements for foam plastic insulation. See ICBO-ES ER 2257, BOCA-ES RR 21-02, NES NER 699, Und. Lab. Inc." Classified, see Classification Certificate D369.
**Not all product sizes are available in all regions.
†R means resistance to heat flow. The higher the R-value, the greater the insulating power. R-values are expressed in ft2•h•°F/Btu.
††Vertical compressive strength is measured at 10% deformation or at yield, whichever occurs first.
