PS
R-Value & RSI Calculator - Walls
Wall Assembly Thermal Resistance
R = imperial
RSI = metric
Import from Drawing Pin your drawing detail as a reference while you enter layers
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Drop or paste your wall assembly detail here
Click to browse • Ctrl+V to paste a screenshot or text
Wall Assembly Layers Add layers from exterior to interior
Include air films (exterior & interior surface resistance)
Apply effective R calculation (thermal bridging via studs) NBC 9.36.2.4
%
From Table A-9.36.2.4.(1)-A.
A checkbox will appear under each insulation layer — tick it to apply the parallel-path correction (cavity + framing) for that layer. Assembly type + spacing auto-fill the framing factor from BCBC Table A-9.36.2.4.(1)-A; pick "Custom" to override manually.
Total Thermal Resistance
R-Value (Imperial)
ft²·°F·h / BTU
RSI Value (Metric)
m²·K / W
BCBC §9.36.2.6 Compliance Check Compare your effective RSI against the climate-zone target
 
Add layers to evaluate compliance.
Layer Breakdown
Layer Thickness R-Value RSI