PDFWAC 51-11C-402142
Table C402.1.4.2—Effective R-values for steel stud wall assemblies.
Table C402.1.4.2
Effective R-values For Steel Stud Wall Assemblies
NOMINAL STUD DEPTH (inches) | SPACING OF FRAMING (inches) | CAVITYR-VALUE (insulation) | CORRECTION FACTOR (Fc) | EFFECTIVE R-VALUE (ER) (Cavity R-Value × Fc) | |
3 1/2 | 16 | 13 | 0.46 | 5.98 | |
15 | 0.43 | 6.45 | |||
3 1/2 | 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 | ||
[Statutory Authority: RCW 19.27A.020, 19.27A.025, 19.27A.160 and chapters 19.27A and 19.27 RCW. WSR 22-14-091, 23-12-101, and 23-20-021, § 51-11C-402142, filed 7/1/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.025, 19.27A.160, and 19.27.074. WSR 16-03-072, § 51-11C-402142, filed 1/19/16, effective 7/1/16.]