STYROFOAM™ brand rigid foam sheets are available in common thicknesses of 1”, 2”, and 3”, with varying densities, insulation values (R-values), and compressive strengths depending on the application. These products are widely used in residential and light construction for foundation insulation, under-slab insulation, exterior wall systems, and specialty uses such as EIFS, packaging, and crafts.
STYROFOAM™ Sheet Comparison
| Thickness | R-Value | Compression Strength | Typical Applications | Key Benefits |
|---|---|---|---|---|
1" |
R-5 |
25 PSI @ 10% deformation |
Exterior foundation walls, EIFS systems, below-grade insulation, packaging, arts & crafts |
Basic insulation, moisture resistance, suitable for backfill conditions |
2" |
R-10 |
25 PSI |
Under concrete slabs, especially hydronic radiant heat, foundations |
High-efficiency under-slab insulation, supports slab loads, improves radiant heat performance |
3" |
R-15 |
Not specified; varies by density |
Exterior and interior foundation insulation, cold climate applications |
Highest insulation value, improved freeze/thaw protection, added thermal and moisture protection |
