| Expanded Polystyrene density |
1.5lbs/cu.ft. |
| Average thickness of EPS |
2.5" / panel (5" total) |
| Steady State R-value |
R-20 foam value |
| Effective R-value (concrete, form, air infiltration, and thermal mass) |
R-24 to R-50 |
| Actual R-value |
4.4/inch |
| Thermal Mass (form & concrete) |
6" core: 72lbs/sq.ft.
8" core: 96lbs/sq.ft. |
| K-Factor |
.24/inch |
| Water absorption |
Less than 3% (ASTM C272) |
| Water vapor |
0.56 perms per 2.5" |
| Sound
class |
STC Sound Class rating of 54
with 1/2-inch sheet rock both sides
STC Sound Class rating of 51
with 1/2-inch sheet rock one side |
| Fire wall |
Fire wall rating
5,000 to 12,000 lbs per
lineal foot for 3 hours. |
| Concrete compressive strength |
3000 psi |
| Concrete pouring temperature |
Down to 0°F (-18°C) |
BuildBlock ICFs...Performs as high as R-50 Value. 
