Closed Cell Spray Foam Insulation R Value Chart

When first installed the r value of closed cell spray polyurethane foam is actually about 10 for a one inch thickness.

Closed cell spray foam insulation r value chart. 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. The r value of fiberglass insulation is approximately 2 2 per inch so much thicker fiberglass insulation is required to achieve the same r value of 38. In regards to closed cell sprayed in foam insulation r value can range between r 4 9 to r 7 1 per inch. As a benchmark one inch of solid wood has an r value of 1.

For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Closed cell insulation products such fiberglass batt insulation standard fiberglass insulation batts or blankets provide an r value of 2 2 to 3 8 per inch of thickness. The specifications for a closed cell foam from basf comfort foam 158 advise installers comfort foam 158 is designed for an application rate of inch minimum to 2 inches maximum. As part of the research for that project we compared a variety of basement insulation options including closed cell spray foam rigid foam board insulation cellulose and the staple of most homes fiberglass 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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. Several years ago we wrote a whole series on installing spray foam insulation in our basement. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another.

Insulation options are generally compared by r value which is a measure. Over time around six months typically it will drop to 6 5 then stabilize and retain its still way higher than all other insulations value of 6 5 for decades. The common denominator among varieties of insulation is the r value. Closed cell spray foam insulation cost is 1 25 2 00 per board foot for the material diy.

Closed cell spray foam insulation 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. Most manufacturers produce an r 13 batt that fits into a 2 by 4. Of 2 0 pcf insulstar has an r value of 5 77 per inch so the maximum thickness of 2 inches yields an r value of about 11 5. All these have r values ranging from r 3 2 to r 3 8 per inch.

For example roll insulation suitable for 2 4 wall and ceiling cavities is about 0 35 to 0 40 per square foot. Closed cell spray foam r values 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.