Sound Transmission Class: partition
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 | thickness in (in) | weight psf (lb/ft2) |
|---|---|---|---|---|---|---|---|---|
| partition | partition_demountable_stc32 | 32 | Demountable office partition STC 32 | Demountable gypsum panel partition; 3 in thick; mineral wool infill; acoustic seals; bottom track | 0 | Low-mass flanking at 125-250 Hz; STC 32-35 typical commercial grade; ceiling plenum flanking dominant | 3 | 5 |
| partition | partition_demountable_stc42 | 42 | Demountable office partition STC 42 | High-performance demountable partition; 4.5 in; double-wall glass wool; perimeter seals; deck-to-deck | 0 | Deck-to-deck eliminates plenum flanking; STC 40-45 range for high-performance office | 4.5 | 8 |
| partition | partition_glass_1in | 40 | Full-height glass partition 1 in glazing | Framed glass partition; 1 in laminated glass (PVB); floor-to-slab; sealed perimeter | 0 | Flanking via slab connection; coincidence at 500 Hz in glass; sealing critical for performance | 1 | 12 |
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