Sound Transmission Class: door
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) |
|---|---|---|---|---|---|---|---|---|
| door | door_acoustic_stc38 | 38 | STC-38 acoustic door assembly | 1-3/4 in solid wood core; full perimeter seals; automatic drop seal; double-pane vision light; rated assembly | 0.5 | STC 38 with all seals engaged; mid-freq limited by door mass; leakage eliminated | 2 | 12 |
| door | door_acoustic_stc45 | 45 | STC-45 acoustic door assembly | Heavy solid core or composite; full perimeter compression seals; automatic drop seal; labyrinth threshold; 3 in total | 1 | STC 45 commercial acoustic door; flanking via frame; wall construction must match | 3 | 18 |
| door | door_acoustic_stc52 | 52 | STC-52 acoustic door assembly | Double-wall acoustic door with air gap; 4-4.5 in combined; full seals; lead-lined or concrete-board panels; recording studio / broadcast | 1.5 | STC 52 heavy acoustic door; used for recording studios and mechanical rooms; substantial hardware | 4.5 | 30 |
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