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U-factors of walls with cold-formed steel studs shall be permitted to be determined in accordance with Equation 4-1.
(Equation 4-1)
where:

Rs
 = The cumulative R-value of the wall components along the path of heat transfer, excluding the cavity insulation and steel studs.
ER  = The effective R-value of the cavity insulation with steel studs as specified in Table C402.1.4.2.

TABLE C402.1.4.2
EFFECTIVE R-VALUES FOR STEEL STUD WALL ASSEMBLIES
NOMINAL STUD DEPTH

(inches)
SPACING OF FRAMING

(inches)
CAVITY R-VALUE

(insulation)
CORRECTION FACTOR

(Fc)
EFFECTIVE R-VALUE (ER)

(Cavity R-Value × Fc)
31/2 16 13 0.46 5.98
15 0.43 6.45
31/2 24 13 0.55 7.15
15 0.52 7.80
6 16 19 0.37 7.03
21 0.35 7.35
6 24 19 0.45 8.55
21 0.43
9.03
8 16 25 0.31 7.75
24 25 0.38 9.50
For SI: 1 inch = 25.4 mm.

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