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

Acoustic Junction Details

Every isolation system fails first at the junctions, not at the center of the wall. These five details show how the float floor, partitions, ceiling barriers, and columns stay separated while remaining fully sealed [AC].

Junction Count
5 critical details
Plenum Barrier
600 mm each side
Ceiling Gap
10 mm Tremco seal
Column Gap
10 mm min [AC]

Detail 1 — Wall to Float Floor

Wall bears on structural slab only [AC]

The acoustic wall line must sit directly on the structural slab. The float floor builds up beside it with the 25 mm perimeter isolation gap fully maintained.

Acoustic walls bear on structural slab only [AC] Float floor build-up Structural slab Wall line 25 mm gap kept free and sealed

Detail 2 — Partition Head to Ceiling

Plenum barrier prevents flanking [AC]

W6 and W7 partitions continue through the tile plane. A 15 mm gypsum plenum barrier sits flat on top of the tiles for 600 mm each side of the partition and is sealed to the partition with Tremco.

600 mm each side Plenum barrier prevents flanking [AC] Plenum zone Tile plane Partition continues above ceiling to seal line

Detail 3 — Concrete Wall to Ceiling

10 mm sealed edge

At W1, W2, W3, and W4, the resiliently mounted gypsum face stops short of the ceiling tile. The 10 mm top edge is sealed with Tremco rather than hard-filled.

10 mm Gypsum face on resilient assembly 10 mm gap to ceiling tile with Tremco sealant Concrete wall build-up ends without touching ceiling tile edge.

Detail 4 — Buffer Spine Corner Junction

Staggered stud corner [AC]

W5 buffer spine and W6 partition meet at 90 degrees with staggered framing. No stud should directly couple one wall face to the other at the corner.

W5 W6 No direct stud connection at corner Independent faces remain decoupled

Detail 5 — Column Clearance

Editing Suite · COL_W

The floor build-up must float around the column with a 10 mm minimum clearance all around. Acoustic sealant closes the top of the joint, but rigid grout is never allowed.

COL_W at x = 339–399 cm 10 mm min — column must float from floor [AC] Acoustic sealant at top edge only No rigid grout or mortar in annular line