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STC Wall Comparison

STC ratings for all wall assemblies, doors, and the observation window. Field ratings are typically 3–7 dB lower than laboratory values.

STC Comparison — All Elements

STC 0STC 20STC 48STC 50STC 60STC 70W1 — North concreteSTC 65W2 — NW diagonal concreteSTC 65W3 — East server wallSTC 62W4 — South rebuiltSTC 50W5 — Buffer spineSTC 55W6 — VO/Control partitionSTC 53W7 — Studio/Editing partitionSTC 48D1 — Exterior entrySTC 50D2 — Buffer westSTC 45D3 — VO/ControlSTC 45D4 — Studio/EditingSTC 48OW-1 window — ObservationSTC 50
W1W2W3W5W4W6W7 upgradedD1D2 / D3D4 upgradedOW-1

Wall Schedule

WallNameLab STCField STC Est.Thickness
W1North concrete6558–62variable
W2NW diagonal concrete6558–62variable
W3East server wall6255–5916cm (16cm new build + 100mm pre-existing air gap to server room = 26cm total buildup)
W4South rebuilt5044–4815cm
W5Buffer spine5549–5315cm
W6VO/Control partition5347–5112cm
W7Studio/Editing partition4843–4611cm

Door & Window Schedule

ElementLocationLab STCField STC Est.
D1Exterior entry5044–48
D2Buffer west4540–43
D3VO/Control4540–43
D4Studio/Editing4843–46
OW-1 windowObservation5044–48

Technical Notes

Mass-Air-Mass (MAM)

Two gypsum layers with air gap — the gap resonance frequency must be above 200Hz for audible range effectiveness. Below this frequency, the double-leaf system can actually perform worse than a single leaf of equal total mass.

Green Glue

Constrained layer damping compound — adds 5–8 STC points vs single-layer gypsum. Applied wet between two rigid layers, it converts vibration energy to heat. Used on Wall 7 (both faces) and D4 frame.

RSIC Clips

Resilient sound isolation clips decouple gypsum from structure, eliminating direct vibration path. RSIC-1 for concrete walls (W1, W2, W3), RSIC-V for diagonal surfaces (W2 NW diagonal).