Spray Foam Insulation R Value 2x4

Use r 19 or r 21 kraft faced fiberglass insulation for two by six 2x6 walls.

Spray foam insulation r value 2x4.

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. R values are additive so you can multiple the number of inches of insulation thickness times the r value to arrive at a total insulation value. How to achieve r 21 in a 2x4 wall. However fiberglass generally does not provide.

Ultimate spray foam insulation has a few different foam products of different densities. This r value is similar to that of r13 fiberglass batting. Insulation is rated in two ways r value and u value. 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. The r value of the high density spray foam wall decreases from an installed r value. Using two dimensional heat flow analysis with thermal bridging effects and average framing factors it is clear that the thermal bridging through the framing bottom plate and top plate reduces the effectiveness of the spray foam insulation. What is the r value insulation value of spf insulation.

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. For 6 inches r 15 or r 19 etc. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch. Our open cell foam product has an r value of 3 5 per inch and in most applications a house constructed with 2x4 studs will have 3 5 inches of open cell foam thus resulting in a total r value of 12.

Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch. Choose foam it green spray foam insulation kits and don t settle for less than you deserve. The r value of spray foam insulation is approximately 6 per inch so those using spray foam as their insulator will need about 6 3 inches of thickness to reach r 38. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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 in your attic to reach r 30 if you live in zones 2 or 3. Closed cell spray foam r values. Best insulation for 2x4 and 2x6 wall studs. If you d like to start saving money and time today buy foam it green spray foam insulation now or call us at 800 516 0949.