What is the difference between low density, open cell SPF and medium density closed cell SPF?

  • 1/2 lb Spray Polyurethane Foam (SPF)
    Low density, open cell SPF refers to a generic spray polyurethane SPF that weighs between 0.4 to 0.6 lbs per cubic ft when fully cured. It is spray applied to a substrate as a liquid and expands about 100-150 times its original volume to form a semi-rigid/flexible, non-structural SPF insulation. The SPF has an R-value around 3.5 per inch and typically uses water as the blowing agent.
  • Medium Density, Closed Cell Spray Polyurethane Foam (SPF)
    Medium density, closed cell SPF used in interior applications typically refers to generic spray polyurethane foam that weighs between 1.5 to 2 lbs per cubic ft when fully cured. It is also spray applied as a liquid to a substrate and expands about 35 to 50 times its original volume to form a rigid, structural SPF insulation with a compressive strength between 15 to 25 PSI. The SPF has an R-value of around 6.0 per inch (aged R-value) and uses high R-value blowing agents.
  • Similarities: Both products are excellent air barriers in buildings, provide great insulation, can assist in the control of condensation within buildings and have great environmental benefits.
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