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Wall W6 (VO/Control) — 150mm decoupled + observation window

Deepened to 150mm decoupled studs so OW-1 sits flush; window + door D3 in this wall · click any drawing to zoom · acoustics5

What you need

1
150mm decoupled / staggered steel studs · W-07F
Qty: 1 lot
Deepened so the 170mm window fits flush — keep leaves decoupled
2
Mineral wool 150mm (W6 cavity) · W-05B
Qty: area TBC
Fill the deeper cavity
3
Gypsum 12.5mm ×2 each face · W-07
Qty: per area
Two layers per face
4
Observation window OW-1 + door D3 · OW-01 / D-03
Qty: 1 / 1
See Build 07 (window) — fits flush in the 150mm wall

Build sequence

VO LIVECONTROL1

1 Frame 150mm — DECOUPLED

Erect 150mm staggered / resilient-channel studs and fill with 150mm wool. A single 150mm stud screwed to both faces would bridge them — keep the leaves decoupled.

VO LIVECONTROL2

2 Gypsum face A (VO)

Two layers of 12.5mm gypsum on the VO side.

VO LIVECONTROL3

3 Gypsum face B (Control)

Two layers of 12.5mm gypsum on the Control side.

VO LIVECONTROL4

4 Frame the OW-1 opening

Build the window box in the deepened wall so the ~170mm window frame sits flush (no proud box-out). Splayed, absorptive-lined reveal.

VO LIVECONTROL5

5 Install window + door

Fit the 2-pane OW-1 window (Build 07) and door D3 (STC 45) with magnetic seal (Build 06).

Golden rule: The deeper wall only helps if it stays DECOUPLED (staggered / resilient channel). Verify STC ≥ 53 after build.