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Sound Transmission Class: wall
wall steel stud 2layer no insul to wall wood stud 2layer insul
Sound Transmission Class (STC), Impact Insulation Class (IIC), and Outdoor-Indoor Transmission Class (OITC) ratings for building assemblies — walls, floor-ceilings, doors, windows, partitions — per ASTM E90/E413/E492/E1425
| assembly type | assembly id | STC rating (dimensionless) | assembly description | construction detail | fire rating hr (hr) | frequency weaknesses | standard | thickness in (in) | weight psf (lb/ft2) |
|---|---|---|---|---|---|---|---|---|---|
| wall | wall steel stud 2layer no insul | 39 | Steel stud wall 2-layer gypsum no insulation | 3-5/8 in metal studs at 24 in OC; two 5/8 in gypsum each side; no insulation | 0 | Without insulation: poor 250-500 Hz; coincidence at 2000 Hz | ASTM E413; STC Ratings.com; WCC STC Ratings Bulletin 5-001 | 6.5 | 9 |
| wall | wall wood stud 1layer insul | 38 | Single wood stud wall 1-layer gypsum with insulation | 2x4 wood studs at 16 in OC; 1/2 in gypsum wallboard each side; 3.5 in glass fiber batt insulation | 0 | Coincidence dip 1500-2000 Hz; lower freq flanking reduced by insulation | ASTM E413; Egan 2007; Mehta Johnson Rocafort Architectural Acoustics 1999 Table 11-1 | 5 | 6 |
| wall | wall wood stud 1layer no insul | 33 | Single wood stud wall 1-layer gypsum no insulation | 2x4 wood studs at 16 in OC; 1/2 in gypsum wallboard each side; no insulation; bare stud cavity | 0 | Low freq (125-250 Hz) flanking through studs; mass law limited | ASTM E413; Egan Architectural Acoustics 2007 Table A-4; GA-600-2019 | 5 | 5.8 |
| wall | wall wood stud 2layer insul | 44 | Single wood stud wall 2-layer gypsum with insulation | 2x4 wood studs at 16 in OC; two 5/8 in Type X gypsum each side; 3.5 in glass fiber batt | 1 | Some 125-250 Hz flanking through stud; improved mass helps mid-high freq | ASTM E413; GA-600-2019 WP 3520; USG SA100 | 6 | 11.5 |
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