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

Acoustic Penetration Sealing Details

Every mechanical and electrical penetration through an acoustic boundary must be sleeved, packed, and sealed as shown here. All critical sealing points carry amber [AC] markers.

Detail Count
4 sealing types
Fire Coordination
EI 60 at duct sleeves
Sealant
Tremco Fyre-Sil
Acoustic Risk
Both faces must seal [AC]

Detail A — Single EMT Conduit

25 / 32 mm EMT

Single conduit penetration with 10 mm annular gap and fire-rated acoustic sealant applied from both wall faces.

Elevation

[AC] both faces 10 mm annular gap with Tremco Fyre-Sil, 50 mm deep each side

Cross-Section

[AC] [AC] Sealant depth each face = 50 mm

Detail B — Cable Bundle

50 mm sleeve · 40% max fill

Cable bundle through a 50 mm sleeve with Hilti CP 617 acoustic putty and self-amalgamating tape wrap. Maximum fill ratio is limited to 40%.

Elevation

[AC] Hilti CP 617 Bundle wrap + putty pack. Max fill ratio 40%.

Cross-Section

Self-amalgamating tape wrap around bundle before putty pack

Detail C — HVAC Duct Penetration

EI 60 required [AC]

Round HVAC duct through fire-rated sleeve with mineral wool packing, Tremco Fyre-Sil each face, and Hilti CP 644 fire collars. Coordinate this detail with the HVAC engineer before fabrication.

Elevation

[AC] EI 60 Mineral wool annular packing + fire collar both sides

Cross-Section

[AC] [AC] Tremco Fyre-Sil each face + Hilti CP 644 fire collar both sides

Detail D — Copper Pipe Penetration

28 mm copper

Copper pipe penetration with foam isolation sleeve and acoustic sealant both faces. The isolation sleeve prevents structure-borne flanking through the wall assembly.

Elevation

[AC] both faces Foam isolation sleeve prevents vibration flanking

Cross-Section

Acoustic sealant at both faces. Sleeve remains resilient.