R-value measures how well insulation resists heat flow. The higher the number, the better it insulates. EPS foam board gives roughly R-4 per inch. See the R-value and thickness guide.
Insulation Resources & Guides
Straight answers about foam insulation
Picking foam insulation comes down to a few numbers: R-value, thickness, density and compressive strength. These guides explain each one in plain words, with charts from the manufacturers' data sheets.
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Quick Answers
What does R-value mean?
What does psi mean on foam board?
Psi is compressive strength: how much pressure the foam can take before it compresses by 10%. It matters most under slabs and on roofs. See the density and compressive strength guide.
Is EPS, XPS or polyiso right for my job?
Each has strengths. EPS costs less for the same R-value and keeps its R-value over time. Polyiso gives more R-value per inch above the roof deck. XPS has the highest strengths. See the EPS vs. XPS vs. polyiso guide.
Can you cut foam to a custom size or thickness?
Yes. Source Mountain Supply supplies custom sizes, thicknesses, densities and shapes. Tell us what you need.
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