How Is Sound Isolation Engineered Between FEC Attractions?

The engineer starts by assigning NC targets: party rooms and offices in the NC 30 to 35 range, corridors higher, attraction zones per their function. Each demising assembly — wall, floor-ceiling, or roof-ceiling — is then designed to the STC (and where impact matters, IIC) rating that delivers the target given the source levels. The trampoline court wall is the classic hard case: high source levels plus impact transmission, demanding both mass and decoupling. Construction details make or break the rating. The engineer details full-height walls sealed to the structure above (sound flanking over the top of a partition is the most common isolation failure), acoustic sealant at every perimeter, putty pads or sealed boxes at electrical penetrations, and solid-core doors with full seals wherever a door interrupts a rated wall. The drawings call out the acoustic assemblies explicitly, and the engineer inspects them before they're covered — isolation can't be verified after the drywall is up.

Impact noise — jumping on trampolines, dropped equipment, running feet — transmits through the structure, not the air, so wall mass alone doesn't stop it. The engineer isolates the sources: floating floor systems or resilient underlayments under the high-impact zones, isolated equipment curbs on the roof, and structural breaks where the budget allows. The goal is to keep the impact energy from ever entering the building frame. The HVAC design is verified as an acoustic system. Duct silencers go at the boundaries between zones of different criteria, transfer ducts between rooms get sound traps, and the air velocities are kept low in the quiet zones. The engineer also checks the equipment selections: a rooftop unit over the party rooms gets the acoustic curb and the discharge silencers, and the background sound check at commissioning happens with the HVAC at full operation — that's the condition the criteria were written for.

Use this checklist before the partitions are closed: • NC targets assigned per space: party rooms and offices low, attraction zones per function • Demising assemblies designed to the STC/IIC ratings the criteria demand, especially at the trampoline court • Walls built full height to structure with acoustic sealant, sealed penetrations, and solid-core sealed doors • Impact sources isolated: floating floors or resilient underlayments under high-impact zones • Duct silencers at zone boundaries; transfer ducts with sound traps; low air velocities in quiet zones • Roof equipment on acoustic curbs with discharge silencers where it sits over quiet spaces • Acoustic assemblies inspected before drywall covers them — isolation can't be verified afterward • Background NC verified at commissioning with the HVAC running at full operation