Foam Roof Insulation R Value

Very good air bypass leak sealing properties.

Foam roof insulation r value.

4 8 7 21. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. The r value of closed cell foam is r 6 5 7 per inch. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency.

R panel is manufactured with a closed cell polyisocyanurate foam core bonded to fiberglass reinforced facers and designed for use over metal nailable and non nailable roof decks with a variety of membrane systems. This product typically has an r value of 3 6 to 4 0 per inch of thickness. Corrosion problems when in contact with steel roofing moisture. Products provide superior insulating properties.

8 3 4 4 8 2 20. 4 5 21. Foamular extruded polystyrene xps rigid foam insulation offers foamular extruded polystyrene xps rigid foam insulation offers a comprehensive line of products choose the strength you need from 15 to 60 psi and exceptional moisture resistance. All these have r values ranging from r 3 2 to r 3 8 per inch.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Closed cell spray foam insulation. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Phenolic foam spray insulation.