What is the R-value of open-cell (semi-rigid) spray foam insulation and is that an aged value?
The R-Value is rated at 3.81 ft2.h°F. In a nominal 4-inch wall, the R-Value is about R-13; in a 6-inch wall, about R-21. Unlike foams filled with CFC or HCFC, the R-Value of open-cell spray foam insulation does not decline as it ages. R-Values of insulating materials are measured in laboratories and are designated a nominal R-Value per inch. In the wall or ceiling of a building most factory-made insulation materials suffer a reduction in performance due to air leakage and infiltration. The insulating value of many building components may be as low as 50% of the nominal R-Value of the insulation they contain. By contrast, the insulation of a wall containing spray foam insulations produced by DEMILEC (USA) Insulation will perform closely to that of the laboratory tested R-Value of the material, and it seals the wall cavity from air infiltration as well. The spray foam insulations produced by DEMILEC (USA) are particularly suited for steel or wood frame construction. Open-cell spray foam
