Siding R-Value Calculator
Calculate the R-value (thermal resistance) of your siding with our comprehensive calculator. Determine insulation performance for different siding materials, thicknesses, and construction types.
Step 1: Siding Specifications
Understanding R-Value
R-value measures thermal resistance – higher values mean better insulation. R-values are additive, so the total R-value is the sum of all material layers in your wall assembly.
Step 2: Wall Assembly
About Air Spaces
Air spaces behind siding provide drainage and ventilation. A ¾” air space typically adds R-0.9 to thermal resistance. Proper ventilation helps prevent moisture issues and improves energy efficiency.
R-Value Calculation Results
Total Wall Assembly R-Value
Energy Efficiency Rating
Based on your R-value of R-24.7, your wall assembly provides good energy efficiency for most climate zones. Consider adding more insulation for colder climates.
Siding Material R-Value Comparison
| Siding Material | Thickness | R-Value per inch | Total R-Value | Typical Use |
|---|
R-Value Layer Breakdown
R-Value Formula
Total R-Value = Rsiding + Rsheathing + Rinsulation + Rair space + Rinterior finish
To calculate total R-value: Add the R-values of each component layer in your wall assembly. R-values are measured in ft²·°F·h/BTU (imperial) or m²·K/W (metric).
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