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2. Styrofoam - Wikipedia

   en.wikipedia.org/wiki/Styrofoam

   The claimed R-value of Styrofoam insulation is approximately 5 °F⋅ft 2 ⋅h/BTU for 1 inch thick sheet. [7] Styrofoam can be used under roads and other structures to prevent soil disturbances due to freezing and thawing. [8] [9] DuPont also produces Styrofoam blocks and other shapes for use by florists and in craft products. [10]

3. Building insulation material - Wikipedia

   en.wikipedia.org/wiki/Building_insulation_material

   Closed-cell foams are superior insulators. While open-cell foams typically have R-values of 3 to 4 per inch (RSI-0.53 to RSI-0.70 per inch), closed-cell foams can attain R-values of 5 to 8 per inch (RSI-0.88 to RSI-1.41 per inch). This is important if space is limited, because it allows a thinner layer of insulation to be used.

4. List of insulation materials - Wikipedia

   en.wikipedia.org/wiki/List_of_insulation_materials

   1 1.1–1.2: 45–48 [3] Foil-faced polyisocyanurate rigid panel (pentane-expanded) initial 2.54: 1 1.20: 6.8: 55 [3] Foil-faced polyisocyanurate rigid panel (pentane-expanded) aged 5–10 years 2.54: 1 0.97: 5.5: 38 Polyisocyanurate spray foam 2.54: 1 0.76–1.46: 4.3–8.3: 30–57 Closed-cell polyurethane spray foam 2.54: 1 0.97–1.14: 5.5 ...

5. R-value (insulation) - Wikipedia

   en.wikipedia.org/wiki/R-value_(insulation)

   Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value (in K⋅m 2 /W) is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

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7. Structural insulated panel - Wikipedia

   en.wikipedia.org/wiki/Structural_insulated_panel

   EPS is the most common of the foams used and has an R-value (thermal resistance) of about 4 °F·ft 2 ·h/Btu (equivalent to about 0.7 K·m 2 /W) per 25 mm thickness, which would give the 3.5 inches (89 mm) of foam in a 4.5-inch-thick (110 mm) panel an R value of 13.8 (caution: extrapolating R-values over thickness may be imprecise due to non ...