What is the heat coefficient of 5 inches for standard roofing insulation?

I need a bit more detail to give a precise answer because "heat coefficient" can mean different things (R-value, U-value, thermal conductivity). Here are typical interpretations and likely values for common roofing insulation types at 5 inches thickness:

1. R-value (thermal resistance)

• Fiberglass batt or loose-fill: roughly R-2.2 to R-3.0 per inch → 5 in ≈ R-11 to R-15.
• Cellulose loose-fill: ~R-3.2 to R-3.8 per inch → 5 in ≈ R-16 to R-19.
• Mineral wool: ~R-3.0 to R-3.3 per inch → 5 in ≈ R-15 to R-16.5.
• Polyisocyanurate (rigid board): ~R-6.0 to R-6.5 per inch → 5 in ≈ R-30 to R-32.5.
• Expanded polystyrene (EPS): ~R-3.6 to R-4.0 per inch → 5 in ≈ R-18 to R-20.
• Extruded polystyrene (XPS): ~R-5.0 per inch → 5 in ≈ R-25.

2. U-value (thermal transmittance) U = 1 / R_total. Example: if R = 20, U = 0.05 Btu/(h·ft²·°F).

3. Thermal conductivity (k, W/m·K) If you need k rather than R, convert: R (ft²·°F·h/Btu) = thickness (ft) / k (Btu/(ft·h·°F)). Typical k values:

• Fiberglass ~0.04–0.05 W/m·K
• Polyiso ~0.02–0.03 W/m·K (Conversions depend on units — tell me which units you want.)

If you tell me the insulation material and the unit you need (R-value, U-value, or thermal conductivity, and units: imperial or SI), I’ll compute the exact number for 5 inches.