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

Float Floor Build-Up Detail

Float floor assembly for all 3 rooms + buffer. Sylomer SR28 pads, twin 18 mm T&G plywood layers, perimeter isolation gap, and room-finish transition are shown as build-critical details.

System
Sylomer SR28 pads
Total Build-Up
150 mm [AC]
Pad Size
150 × 150 mm
Grid
400 mm centers

Drawing 1 — Vertical Cross-Section

150 mm overall build-up [AC]

From structural slab to finish floor. Keep the 10 mm perimeter isolation gap continuous around the entire float floor line.

Structural concrete slab · 200 mm Sylomer SR28 pad Air gap between pads Bottom 18 mm T&G plywood Top 18 mm T&G plywood Floor finish: vinyl 3 mm or carpet 8 mm 150 mm total [AC] Total build-up = 150 mm 10 mm perimeter gap 10 mm perimeter gap

Drawing 2 — Sylomer Pad Plan View

VO Live example · 24 pads

Example layout using the VO Live equivalent-rectangle footprint of 319 × 133 cm (equiv.). Dashed red border marks the 10 mm perimeter gap. Trapezoid room — pad grid per SYLOMER-LAYOUT.

319 cm equiv. width 133 cm equiv. depth Trapezoid room — equivalent rectangle shown; pad grid per SYLOMER-LAYOUT. Pad count: 24 Pad area: 0.54 m² Grid: 400 mm centers Pad size: 150 × 150 mm Perimeter gap: 10 mm [AC] Coverage note Coverage = 24 pads x 0.0225 m² each = 0.54 m² Sylomer contact area

Drawing 3 — Perimeter Gap Detail

Critical flanking break [AC]

Enlarged detail showing the isolation gap between float floor edge and wall base. This joint must remain flexible and must not be bridged by skirting, screed, or debris.

[AC] Float floor must not touch wall base 10 mm gap Backing rod Ø13 mm Sealant bead 8 mm depth Label: [AC] CRITICAL — Must not bridge
Failure = flanking path. If screed, skirting, tile adhesive, or debris bridges this joint, the isolation performance of the float floor collapses. Keep the 10 mm gap open until backing rod and Tremco sealant are installed.