We use a 2 lb. closed cell polyurethane foam which contains zero ozone depleting blowing agents, catalysts, polyols or fire retarding materials. The closed cell nature of this product is ideal to use in situations where there is a concern for condensation since it acts as a waterproof and vapor proof barrier. This product has an R-value of 6.9 per inch. This insulation also adds structural rigidity to metal panels on the building.
The open cell has the same specifications except that it is .5 lb and has an R-value of 4 per inch. It does not provide structural rigidity as it is flexible and it does not provide a waterproof or vapor barrier.