Insulation
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Insulation is some material that is used to reduce the rate of heat transfer.
An R-Value is a calculated value used to measure and compare the insulative values of different materials. R = Temperature Difference × Area × Time ÷ Heat Loss The temperature difference is measured in degrees Fahrenheit, area in square foot, time in hours, and heat loss in BTUs.
| Material, for each inch | R-Value |
|---|---|
| High density EPS foam | 4[1] |
| Soil | 0.25–1[2] |
| Sand | 0.08–0.11[2] |
| Concrete | 0.07–0.52[3] |