// multi-utility computation suite · offline · instant · precise
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build.insulation-r Calculator
Calculates total wall or roof R-value from stacked insulation layers and facing materials, and compares to code minimum for the climate zone. An uninsulated 2×4 stud wall has an R-value of about 4 — adding R-15 batt insulation brings it to approximately R-19.
Inputs
Th
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
K
Reference formula or conversion factor shown for context.
Layers
Count of items or occurrences.
Area
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
R-value per layer
The computed numeric or monetary value.
total R-value
The combined total across all inputs and components.
U-value
The computed numeric or monetary value.
daily heat loss (kWh, ΔT=20K)
The decrease or degradation from the baseline.
R-value (imperial)
The computed numeric or monetary value.
good wall target
Reference formula or conversion factor shown for context.