Advantages Open or Closed Cell

Advantages of Closed-cell foam over Open- Cell

Closed Cell

Closed-cell foam is non-porous, and not moisture-penetrable, thereby effectively forming a vapor barrier. (N.b., vapor barriers are usually required by the Building Codes, regardless of the type of insulation used. Check with the local authorities to find out the requirements for your area.)

Closed-cell foams are superior insulators. While open-cell foams typically have R-values of 3 to 4 per inch (RSI-0.53 to RSI-0.70 per inch), closed-cell foams can attain R-values of 5 to 8 per inch (RSI-0.88 to RSI-1.41 per inch). This is important if space is limited, because it allows a thinner layer of insulation to be used. For example, a 1-inch layer of closed-cell foam provides about the same insulation factor as 2 inches of open-cell foam.

Open Cell

Closed-cell foam is very strong, and structurally reinforces the insulated surface. By contrast, open-cell foam is soft when cured, with little structural strength.

Insulation is not enough. Add VALUE and energy efficiency with a closed-cell polyurethane foam solution.

Reference: http://en.wikipedia.org/wiki/Building_insulation_materials