R Value Spray Foam Thickness Chart

R 0 77 30 phenolic foam insulation r values.

R value spray foam thickness chart.

8 3 4 4 8 2 20. R value is a measure of insulation s ability to resist heat traveling through it. 4 5 21. 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.

A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14. Corrosion problems when in contact with steel roofing moisture. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart. Expanded polystyrene foam board.

A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer. The r value depends on the type of insulation its thickness and its density. Polyiso insulation thickness r value chart. Insulation level are specified by r value.

For 6 inches r 15 or r 19 etc. It has a lower r value per inch than closed cell foam and is vapor permeable. When calculating the r value of a multilayered installation add the r values of the individual layers. The higher the r value the better the thermal performance of the insulation.

Phenolic foam spray 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 your attic to reach r 30 if you live in zones 2 or 3. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Closed cell polystyrene spray foam 1 inch thick 6 5.

Open cell polyurethane spray foam 3 5 inches thick 12 6. Very good air bypass leak sealing properties. 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. 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.

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. The r value of some insulations also depends on temperature aging and moisture accumulation. Use the following chart to estimate an ideal r value for your insulation project. As always should you have any questions or require any assistance in planning your spray foam insulation job please contact us we are always happy to help.

Closed cell spray foam r values. 4 8 7 21. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.