STYROFOAM extruded polystyrene insulation is rated at an R-value of 5.0 per inch at 75°F.
What is the R-value of rigid foam?
Rigid foam R-values range from R-1 for 1/4-inch thick sheathing panels to R-15 for 3-inch thick panels. R-value is not entirely a function of the thickness of the material, as the facing material and type of foam used will affect the R-value of the material.
What is the R-value of 3 inch foam board?
R-Value Chart for EnerfoilTM Rigid Foam Faced Insulation
| Thickness (Inches) | R-value (in I-P/Imperial) | RSI (R-value in Metric) |
|---|---|---|
| 2.0 | 12.4 | 2.16 |
| 2.5 | 15.5 | 2.7 |
| 3.0 | 18.6 | 3.24 |
| 3.5 | 21.7 | 3.78 |
What is the R-value of 3/4 foam board?
STYROFOAM/BLUE BOARD 3/4″ 4’X8′ DOW R-VALUE: 4.0 (SQUARE EDGE)/ P2S FACING | TWPerry.
What is the R value of 1 inch foam board?
R-3.85 Insulating Sheathing.
What is the R-value of 1 inch foam?
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. All these have R-values ranging from R-3.2 to R-3.8 per inch. The R-value of closed-cell foam is R-6.5-7 per inch.
What is blue foam called?
Styrofoam is a trademarked brand of closed-cell extruded polystyrene foam (XPS), commonly called “Blue Board”, manufactured as foam continuous building insulation board used in walls, roofs, and foundations as thermal insulation and water barrier.
What is the are value of 2 inch foam board?
Open-cell spray foam absorbs and holds water. It has a lower R-value per inch than closed-cell foam and is vapor-permeable. The R-value is R-3.5 to R-3.6 per inch, so filling a 2×4 cavity yields about an R-13. Subsequently, question is, How thick should foam board insulation be?
What is the are value of Styrofoam insulation?
Expanded Polystyrene. Also called Styrofoam insulation, this is the least expensive material. It provides R-values that range from 3.6 to 4.2 per inch. – Polyisocyanurate: Known as polyiso for short, polyisocyanurate foam has the highest R-value per inch (R-6.5 to R-6.8) of any rigid insulation. …
Which is the cheapest foam board insulation to use?
It provides an R-value of 4 per inch of thickness and is the cheapest type of foam board insulation. EPS is used under roofing, over foundation walls and beneath siding.
What happens to the are value of polyiso insulation?
As a foil-faced polyisocyanurate foam insulation, Enerfoil TM ’s R-Value actually more than doubles when it is twice as thick, as you can see from the chart above. Other materials may only have a fifty percent increase in R-Value when their thickness is doubled.
