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eng.thermal-resistance-wall Calculator
Calculates thermal resistance (R-value) of a composite wall from layer conductivities and thicknesses, and overall U-value. Total wall R-value is the sum of individual layer resistances — adding insulation (R-13 batt = 2.3 m²K/W) dramatically reduces heat loss through the envelope.
Inputs
Thickness Mm
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Conductivity
Reference formula or conversion factor shown for context.
Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Delta T
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
R-value (m²K/W)
The computed numeric or monetary value.
total R (incl. surface resistance)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
U-value (W/m²K)
The computed numeric or monetary value.
heat loss (W)
The decrease or degradation from the baseline.
R-value (US ft²°F·hr/BTU)
The computed numeric or monetary value.
PassivHaus wall U
Reference formula or conversion factor shown for context.