Closed cell results in rigid, hard foam with a density of 1.8 to 2.3 pounds per cubic feet. Open cell results in soft, flexible foam with a density of about 0.5 to 0.8 pounds per cubic feet.
The closed cell products we use yield R7 per inch.
The open cell products we use yield R4.5 per inch
We started our spray foam insulation business in 1969 – one of the first contractors in Upstate NY to apply this type of insulation.
See the following link for an article from Building Science Digest that addresses the reasons why venting is not necessary with spray foam insulation.https://www.buildingscience.com/documents/digests/bsd-149-unvented-roof-assemblies-for-all-climates
Closed cell spray foams insulation by nature are resistant to water absorption, and are approved by FEMA as a flood-resistant material. Always discuss with your contractor which type of spray foam is planned for your specific project.
Yes, closed cell is considered a moisture barrier due to the thermal set plastic content.
Yes, moist air cannot get to the cold surface after closed cell spray foam insulation is applied, thus successfully stopping condensation.
We recommend closed cell spray foam insulation for metal pole barn surfaces.