Lightweight apartment walls and ceilings carry impact sound along paths that flooring brochures rarely illustrate. Where a schedule mandates an acoustic treatment system, outcomes usually depend on substrate continuity, perimeter sealing and ceiling interfaces—not only the timber species on top.
Design implications
Underlay selection must pair with approved substrates and adhesive regimes. Changes to slab flatness or sleeper layouts can void assumptions baked into test certificates unless reviewed before procurement locks.
Site realism
Impact isolation improves when resilient paths, ceiling decoupling and door seals align. Cosmetic overlays cannot manufacture silence if the validated stack underneath was never built.