Foam Roof Insulation R Value

This product typically has an r value of 3 6 to 4 0 per inch of thickness.

Foam roof insulation r value.

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

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. R 0 77 30 phenolic foam insulation r values. Corrosion problems when in contact with steel roofing moisture. Products provide superior insulating properties.

4 8 7 21. Closed cell spray foam insulation. Expanded polystyrene foam eps is the cheapest and least used foam board product on the market. 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.

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. 4 5 21. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. All these have r values ranging from r 3 2 to r 3 8 per inch.