Float Floor to Wall Junction
[AC] 25 mm perimeter gap at ALL walls — must NOT be bridged. Any rigid contact defeats the entire isolation system.
| Element | Specification | Critical Note |
|---|---|---|
| Perimeter gap | 25mm at walls · 10mm at columns (COL_W, COL_E) | Continuous — no breaks, no bridges |
| Gap at COL_W | 10mm on all 4 faces of column | Column center: (369.1, 140.6) |
| Gap at COL_E | 10mm on all 4 faces of column | Column center: (762.1, 138.1) |
| Gap fill | Tremco acoustic sealant ONLY | Not foam, not caulk, not silicone |
| Float floor surface | Must NOT touch wall base plate | Base plate sits on structural slab |
| Wall base plate | Sits on structural slab, NOT on float floor | Wall and floor are independent systems |
| Float floor buildup | 15cm: Sylomer SR28 + 2×18mm T&G plywood | Staggered joints, 400mm offset |
Wall to Ceiling Junction
| Element | Specification |
|---|---|
| Gypsum termination | Terminates at ceiling grid level — no rigid contact with structure above |
| Resilient channel at top | Hat channel hung on RSIC clips, NOT rigidly fixed to structure |
| Plenum barrier gypsum | Runs from ceiling tile level (275cm AFF) to structural slab (340cm slab-to-slab) |
| Air gap partition-to-slab | Fill with Rockwool + Tremco sealant [AC] |
| Ceiling grid height | 275cm AFF — ALL rooms, no exceptions |
| Plenum depth | 50cm (275cm ceiling to 325cm structural clear) |
[AC] CRITICAL: Plenum barriers MUST be installed at EVERY partition wall before ceiling close-up. They cannot be retrofitted. Without them, sound flanks over the top of every wall.
Wall-to-Wall Corners
Where partition frames meet concrete walls:
| Rule | Detail |
|---|---|
| No direct contact | Partition frame must NOT touch concrete wall |
| Gap | 10mm between partition frame and concrete |
| Fill | Rockwool + Tremco sealant |
| Fasteners | No screws into concrete through partition frame |
Column Isolation CRITICAL
Any rigid column contact transmits vibration to every floor of the building.
COL_W — West Column
Size
60 × 50 cm
Center
(369.1, 140.6)
Clearance
10mm minimum ALL sides
Method
Boxed out — framing does NOT touch column on any face
Gap fill
Rockwool batt + Tremco sealant
COL_E — East Column
Size
60 × 55 cm
Center
(762.1, 138.1)
Clearance
10mm minimum ALL sides
Method
Boxed out — partially embedded in east wall
Gap fill
Rockwool batt + Tremco sealant
[AC] Sara Kalash confirmed: "boxed out, no screws bolted to column." This is non-negotiable.
Buffer Spine Junctions
| Junction | Detail |
|---|---|
| Buffer spine (W5) | Frames independently — does NOT share studs with any other wall |
| VO/Control partition (W6) | Butts to buffer spine face — does NOT share studs |
| Studio/Editing partition (W7) | Butts to buffer spine face — does NOT share studs |
| T-junction approach | Staggered stud arrangement at all T-junctions |
| Buffer spine thickness | 15cm (West face X: 213.6cm, East face X: 228.6cm) |
| Buffer spine STC | 55 (Wall Type 5) |
HVAC routing: Buffer spine is the ONLY permitted duct routing path between east and west zones.