Foam Roof Insulation R Value

The r value of closed cell foam is r 6 5 7 per inch.

Foam roof insulation r value.

Corrosion problems when in contact with steel roofing moisture. Very good air bypass leak sealing properties. Johns manville r panel rigid roof insulation board offers r values of up to r 23 6 providing high thermal efficiency. This product typically has an r value of 3 6 to 4 0 per inch of thickness.

8 3 4 4 8 2 20. R 0 77 30 phenolic foam insulation r values. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. 4 8 7 21.

All these have r values ranging from r 3 2 to r 3 8 per inch. Products provide superior insulating properties. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s.

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. 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. Phenolic foam spray insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.