Closed Cell Spray Insulation R Value

Closed cell spray foam insulation.

Closed cell spray insulation r value.

Closed cell spray foam exterior applications. A foams r value is its resistance to heat flow or in other words how well they insulate. Closed cell insulation products such as icynene proseal allow builders and architects the ability to achieve r 21 in a three inch pass. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch.

This is more common with closed cell foam but it happens with open cell foam too. Since closed cell foam has a higher r value per inch installers generally spray 2 in walls and 3 in rooflines to meet the energy code requirements of r 13 and r 19 respectively. 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. Innovations such as icynene proseal le allows for an initial pass of five inches 5 to achieve r 35.

Closed cell spray foam insulation cost is 1 25 2 00 per board foot for the material diy. They sport an r value of 6 0 8 0 per inch of insulation about double their open cell foam counterparts. Ideal for continuous insulation solutions. For example roll insulation suitable for 2 4 wall and ceiling cavities is about 0 35 to 0 40 per square foot.

With foamed in place insulation it is relatively easy though not inexpensive to fill wall and ceiling cavities completely. Closed cell spray foam provides a higher r value per inch 6 5 than less expensive insulation types like cellulose and fiberglass 3 5 to 3 7. Higher r value per inch easier to accommodate high r value requirements in narrow spaces. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

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. 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. Contractors often use it to insulate under slabs ceilings walls and roofs. Most spray polyurethane foam is called two component foam.

Lower vapor permeance can be a class ii vdr. For 6 inches r 15 or r 19 etc. Two inches of closed cell foam will provide r12 r14 of insulation. 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.

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. Can be applied at very low temperatures as low as 5of adds wall racking strength as well as impact resistance. Closed cell spray foams are between 2 and 4 lbs. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.

Fiberglass batt insulation is priced by the roll or by the square foot. All these have r values ranging from r 3 2 to r 3 8 per inch.