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Walls W3 / W4 / W5 / W7 — Green Glue damped

Steel studs + wool + 2× gypsum each face with Green Glue BETWEEN the boards (W7 = studio side only) · click any drawing to zoom · acoustics5

What you need

1
70mm steel studs · W-07C
Qty: 1 lot
Frame the partition
2
Mineral wool 70mm · W-05
Qty: 110 m²
Fill the stud cavity
3
Gypsum 12.5mm · W-07
Qty: 138 m²
2 layers each face
4
Green Glue compound (5-gal) + sealant tubes · W-02 / W-03
Qty: 5 / 60
~2 tubes per sheet, BETWEEN the two boards

Build sequence

ROOM AROOM B1

1 Frame + insulate

Erect the 70mm steel studs and friction-fit 70mm wool in the cavity.

ROOM AROOM B2

2 Face A — first board

Screw the first 12.5mm gypsum to the studs on face A.

ROOM AROOM B3

3 Face A — Green Glue + second board

Spread Green Glue (~2 tubes/sheet) on the second board's face — NOT on the studs/edges — and screw it on so it shears between the two boards.

ROOM AROOM B4

4 Face B — first board

Repeat on face B: first 12.5mm gypsum to the studs.

ROOM AROOM B5

5 Face B — Green Glue + second board

Green Glue + second board on face B. (W7: Green Glue on the studio side only.) Seal all perimeters with acoustic sealant.

Golden rule: Green Glue is constrained-layer damping — it only works BETWEEN two boards. Never put it on the studs or within ~12mm of board edges.