Strata buildings live and die on impact noise. Hard floors in the apartment above are the single most common source of complaints to owners' corporations, and the NCC's deemed-to-satisfy provisions make compliance non-negotiable. Cork-rubber composite is one of the few hard-surface options that clears the acoustic threshold without a separate underlay, which is why it keeps appearing in strata by-laws as an approved finish.
What the acoustic rules actually require
Under the National Construction Code, floors separating sole-occupancy units in Class 2 buildings must achieve an impact sound transmission rating of L′nT,w + Ci ≤ 62 (deemed-to-satisfy). Most owners' corporations layer additional by-laws on top, typically requiring an acoustic report from a qualified consultant before any hard-floor change is approved.
Comcork's structural impact reduction (around 19 dB depending on profile) means it generally clears these thresholds on a standard concrete slab without a separate acoustic underlay. That is the difference between a single-trade install and a layered build-up that eats floor height and budget.
Why cork-rubber suits apartment living
- Quiet underfoot for the unit below, the original reason cork was specified in apartments decades ago.
- Warm and forgiving for the resident on top, better than tile or engineered timber for kids, pets and bare feet.
- Slip-resistant in wet areas without the cold-tile feel, relevant for ageing-in-place and accessibility upgrades.
- Low-VOC and low-allergen, useful in smaller, less-ventilated apartment footprints.
- Sealed sheet with cold-welded chemical seams in wet areas, limits water ingress to the unit below.
Owners' corporation approval in practice
Most strata schemes will ask for the product technical data sheet, an impact-isolation test report or acoustic consultant statement, the proposed installation method (including any underlay), and the installer's insurances. Product documentation and the installation method statement come from the supplier or installer; the acoustic report is project-specific and usually obtained separately, against the actual slab and ceiling build-up of the building.
Common-property vs within-unit works
Common-property works (lobbies, corridors, amenity floors) typically go through the building manager or strata committee. Within-unit works are contracted directly with the lot owner once owners' corporation approval is in place. Staged installs around occupied buildings, including after-hours and weekend works, are standard scope on strata projects.