R Value Spray Foam Thickness Chart

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.

R value spray foam thickness chart.

Understanding r value thursday december 13 2018 what does r value mean. 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. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. 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.

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 of some insulations also depends on temperature aging and moisture accumulation. A typical 2 4 stud filled with open cell spray foam will have an r value between 10 5 and 14. Insulation level are specified by r value.

R 0 77 30 phenolic foam insulation r values. Recommended home insulation r values. It has a lower r value per inch than closed cell foam and is vapor permeable. 4 5 21.

Polyiso insulation thickness r value chart. Closed cell spray foam r values. When calculating the r value of a multilayered installation add the r values of the individual layers. Corrosion problems when in contact with steel roofing moisture.

The higher the r value the better the thermal performance of the insulation. Closed cell polystyrene spray foam 1 inch thick 6 5. Expanded polystyrene foam board. 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.

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. 4 8 7 21. Use the following chart to estimate an ideal r value for your insulation project. For 6 inches r 15 or r 19 etc.

Phenolic foam spray insulation. 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. R value is a measure of insulation s ability to resist heat traveling through it. For example closed cell spray foam depending on brand can offer an r 6 or r 7 per inch.

Open cell polyurethane spray foam 3 5 inches thick 12 6. Very good air bypass leak sealing properties. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.