Open-Cell Foam Insulation
Open-cell spray foam insulation is a spray-applied, half pound density, non-structural, thermal insulation material used in wall cavities, floor assemblies, ceiling assemblies and in attic applications. Open-cell foam insulation is a performance upgrade over conventional insulation that leads to energy efficiency, improved occupant comfort, a cleaner indoor environment and greater noise reduction for building/home owners.

Building envelopes with increased insulation levels are becoming standard practice. Consumers are increasingly involved in the selection of green building products due to rising energy costs and the recent availability of tax credits and energy rebates. Open-cell spray foam technology is a cost-effective solution to improve the energy efficiency of a building. The material expands 120 times its initial volume and fills cavities of any shape providing a continuous, protective air barrier that helps to minimize air leakage and air intrusion.

Open-Cell vs. Closed-Cell Spray Insulation Comparison
Properties1 Open Cell SPF Closed Cell SPF
(ASTM D-1622)
0.4 - 0.6 pcf 1.8 - 2.2 pcf
Blowing Agent Water/CO2 only Water/CO2 and 245fa
Aged R-Value
(ASTM C-518)
3.9/inch 6.3/inch
Open Cells
(ASTM D-2856)
>90% -
Closed Cells
(ASTM D-6226)
≥5 lb/in2 ≥15 lb/in2
Air Permeance2
(ASTM E-2178, E-283)
< 0.2 L/s-m2
Air Barrier
at 4½" Thickness
< 0.2 L/s-m2
Air Barrier
at 2" Thickness
Surface Burn Characteristic3
(ASTM E-84)
Class 1 Class 1
Water Vapor Permeance2
(ASTM E-96)
  <1 perm at 2 inches
Vapor Retarder
Water Absorption
(ASTM D-2841)
  < 2%
Resistant to Flood
1For actual performance data on a specific SPF product consult the manufacturer's technical data sheet.
2As designated by the International Code Council in Acceptance Criteria AC377
3Flammability ratings do not represent actual performance in a fire situation. Class 2 is required in most residential applications. Class 1 is required in commercial buildings and some residential applications.
4Classified as "Acceptable Flood Resistant Material" by FEMA, Tech Bulletin 29-3. Fiberglass batt and blanket insulation are classified "Unacceptable".