SSOT v3.7 · Contractor Detail Drawing · Acoustic Design Basis

Wall Assembly Cross-Sections

Horizontal slices through wall types W1–W7. Layer colors are locked across all details for fast contractor coordination, and total thicknesses are dimensioned in purple.

Wall Types
7 assemblies
Thickest
W1 / W2 · 39 cm
Green Glue
W3, W4, W5, W7 [AC]
Partitions
W3–W7
Concrete Gypsum Green Glue Rockwool Air gap MLV Stud zone

W1 — North Concrete Wall

STC 65 · ~39 cm total

Existing 300 mm concrete upgraded with RSIC-1 clips, hat channel cavity, 50 mm Rockwool, and two gypsum layers to control reflected energy into the rooms.

39 cm total thickness 300 mm concrete RSIC-1 clips + 25 mm cavity 50 mm Rockwool 2 x 12.5 mm gypsum Finish face

W2 — NW Diagonal Concrete Wall

STC 65 · ~39 cm total

Same acoustic upgrade logic as W1, adapted to the diagonal perimeter wall. Coordinate clip spacing with the diagonal geometry and maintain continuous finish thickness along the entire face.

39 cm total thickness 300 mm diagonal concrete RSIC-V clips + 25 mm cavity 50 mm Rockwool 2 x 12.5 mm gypsum Diagonal face built plumb from interior line

W3 — East Server Wall [AC]

STC 62 · ~26.5 cm total

Decoupled server wall with existing air gap, 70 mm studs + Rockwool, and double 16 mm gypsum skins with Green Glue on both sides. Green Glue application is mandatory [AC].

26.5 cm total thickness 100 mm existing air gap 2 x 16 mm gyp + GG 70 mm studs + Rockwool 2 x 16 mm gyp + GG

W4 — South Rebuilt Wall [AC]

STC 50 · ~15 cm total

Rebuilt lightweight wall with gypsum / Green Glue on both faces, 100 mm stud cavity, and RW100 insulation.

15 cm total thickness 2 x 12.5 mm gyp GG 100 mm studs + RW100 GG 2 x 12.5 mm gyp

W5 — Buffer Spine [AC]

STC 55 · ~15 cm total

Buffer spine wall mirrors W4 but remains a dedicated service spine. Keep framing true because it establishes the offset between the east and west room sets.

15 cm total thickness 2 x 12.5 mm gyp GG 100 mm studs + Rockwool GG 2 x 12.5 mm gyp

W6 — VO / Control Partition

STC 53 · ~12 cm total

Lightweight staggered-stud partition carrying the observation window opening. Maintain the stagger so the opposite gypsum faces are not hard-coupled through the studs.

12 cm total thickness 2 x 12.5 mm gyp 70 mm staggered studs + RWA45 2 x 12.5 mm gyp

W7 — Studio / Editing Partition [AC]

STC 48 UPGRADED · ~12 cm total

Upgraded partition showing the added Green Glue damping layer on the studio-side double gypsum build-up. Coordinate this detail directly with D4 frame packing.

12 cm total thickness 2 x 12.5 mm gyp + GG 70 mm studs + RWA45 12.5 mm gypsum