Closed Cell Spray Foam Insulation R Value

Closed cell spray foam insulation is vapor and air impermeable and is applied with a minimum of 2 on average with use on on interior and exterior building applications.

Closed cell spray foam insulation r value.

Contractors often use it to insulate under slabs ceilings walls and roofs. The r value of closed cell foam is r 6 5 7 per inch. The r value for closed cell is typically around 6 7 at 1 thick and varies by manufacturer. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.

They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. 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. 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. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. That means if you used foam it green closed cell which is r 7 per inch it s r value for a 3 5 deep wall cavity would be r 24 5. Closed cell foam r6 r8.

Innovations such as icynene proseal le allows for an initial pass of five inches 5 to achieve r 35. This is very important in situations where your code requires an r 21 for the wall but you only have a 2 4 stud because closed cell spray foam is the only way you would achieve the required r value to meet code. But some closed cell foams like tiger foam s e84 closed cell formula have even higher ratings that go up to almost 7 per inch. 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.

Just like for open cell foam r values are additive. Closed cell spray foams are between 2 and 4 lbs. Closed cell spray foam insulation cost is 1 25 2 00 per board foot for the material diy. Spray foam insulation price starts at about 0 60 or 60 cents per board foot for diy open cell spf with a top cost of about 80 cents.

All these have r values ranging from r 3 2 to r 3 8 per inch. A foams r value is its resistance to heat flow or in other words how well they insulate. Fiberglass batt insulation is priced by the roll or by the square foot. Closed cell insulation products such as icynene proseal allow builders and architects the ability to achieve r 21 in a three inch pass.