BuildBlock Technical & Support Overview

BuildBlock Technical & Support is here to help with each step of your ICF project with extensive technical manuals, brochures, and customer support.


BuildBlock Technical Data

Expanded Polystyrene Density:

1.5 lbs/cu. ft.

Average thickness of EPS:

2.5″ / panel (5″ total)

Steady State R-value:

R-21 foam value

Effective R-value:
(concrete, form, air
infiltration, and thermal mass)

R-24 to R-50



Actual R-value:

4.4 Per inch of EPS

Thermal Mass:
(form & concrete)

6″ core: 72 lbs/sq. ft.

8″ core: 96 lbs/sq. ft.


.24 Per inch of EPS

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 sheetrock both sides

STC Sound Class rating of 51
with 1/2-inch sheet rock one side

Fire Wall:

Firewall rating 5,000 to 12,000 lbs per
lineal foot for 3 hours.

Concrete Compressive Strength:

3000 psi

Concrete Pouring Temperature Range:

Down to 0°F (-18°C)


Free BuildBlock Online ICF Training Courses Available Now!

Technical & Support June 12, 2013