CFS WALL R-VALUE CALCULATOR
The CFS Wall R-Value Calculator finds the effective R-value and U-factor of cold-formed steel stud walls by the AISI S250-21 method.
ScotCalc — CFS Wall R-Value Calculator
Scottsdale Construction Systems
ScotCalc
Engineering Tools
CFS Wall R-Value Calculator v1.0
Effective R-value and U-factor of cold-formed steel stud walls by the AISI S250-21 thermal transmittance method.
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U-factor —Btu/h·ft²·°F
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Wall section, scaled by R-value
InsideOutside
What moves the number
Each row changes one input from your current wall and shows the change in effective R-value.
| Layer | Nominal R | Effective R |
|---|
AISI S250 calculation detail
Effective cavity R is the total effective R-value minus every uninterrupted layer, so it shows how much of the batt's rating survives the steel studs. Results follow AISI S250-21 w/S1-22 for standard C-shapes at 6, 12, 16 or 24 in. o.c. and 33–68 mil steel.
ScotCalc · CFS Wall R-Value Calculator · v1.0
© Scottsdale Construction Systems
Calculated per AISI S250-21 w/S1-22. This tool is for estimating only; confirm compliance with your energy code official.
