Closed Cell Foam R Value Chart

While it s true that actual whole wall r values will usually be higher than the values shown in the table due to the r values of the sheathing drywall.

Closed cell foam r value chart.

Why spray foam insulation is so effective in meeting code requirements is that it has a higher r value per inch of product used than batts. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. 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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.

That said the table is useful. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Two inches of closed cell foam will provide r12 r14 of insulation. They contain low conductivity gases in the cells usually one of the hcfc or cfc gases the higher r values r 7 0 to 8 0 are the result of thermal resistance of the gases in the cells.

Closed cell spray foam r values. For 6 inches r 15 or r 19 etc. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. As a benchmark one inch of solid wood has an r value of 1.

Closed cell spray foam insulation. It demonstrates the calculation method and does a good job of estimating the incremental r value attributable to an upgrade from open cell to closed cell foam. Closed cell spray foams are between 2 and 4 lbs. The r value for closed cell is typically around 6 7 at 1 thick and varies by manufacturer.

Polyurethane and polyisocyanurate are both closed cell foams. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior.

If you want to install spray foam in a stud wall and price is no object then it would seem to make sense to specify closed cell spray foam right. Open cell spray foam has an r value of about r 3 7 per inch while closed cell spray foam has an r value that may be as high as r 6 5 per inch. Both closed cell spray foam and open cell spray foam insulation can be used effectively in commercial building designs to allow the building to achieve energy efficiency and consistent performance. Just like for open cell foam r values are additive.

Note that some commercial and industrial buildings may require higher r values.