Understanding strata responsibility for balcony waterproofing in NSW. Common property, lot owner obligations, levy contributions, and the AS 4654 compliance framework explained.
Balcony waterproofing responsibility in NSW strata schemes is one of the most contested maintenance issues owners corporations and lot owners face. The starting point for any strata waterproofing dispute is the Strata Schemes Management Act 2015 (NSW), which sets out who is responsible for maintenance and repair of common property.
Under the Act, the owners corporation is responsible for maintaining and repairing common property. Common property in a strata scheme is defined by the strata plan and typically includes the structure of the building, the external walls, the roof, common areas, and, critically, the waterproofing membrane beneath balcony tiles where that membrane forms part of the structure or the building envelope.
A balcony waterproofing membrane is not furniture or finishes. It is a structural component of the building. Where a balcony is common property or where the waterproofing membrane is part of the common property structure, the owners corporation is generally responsible for its maintenance and repair. This is the prevailing view of the NSW Civil and Administrative Tribunal (NCAT) in waterproofing disputes.
Lot owner responsibility for balcony waterproofing arises in specific circumstances. Where a lot owner has previously altered the balcony waterproofing through a renovation and the failure is traceable to that alteration, the lot owner may bear liability for rectification. This is frequently the case where a previous owner retiled the balcony without engaging a licensed waterproofing contractor and without obtaining strata approval, and the retiling damaged or failed to restore the waterproofing membrane.
Where a lot owner has an exclusive-use by-law over the balcony and that by-law places maintenance obligations on the lot owner, the by-law terms govern. Many older NSW strata by-laws contain exclusive-use provisions that assign maintenance of the balcony surface and associated waterproofing to the lot owner as a condition of exclusive use. The wording of the specific by-law must be reviewed to determine the extent of this obligation.
Where a lot owner has failed to report a known waterproofing issue and the damage has worsened as a result, the lot owner may share liability for the additional damage. Prompt reporting of water ingress from a balcony is a practical obligation even where the underlying repair is the owners corporation’s responsibility.
To understand who pays, it helps to understand what a balcony waterproofing system comprises. A compliant balcony waterproofing system under AS 4654.2:2012 includes a structural substrate, typically concrete, a liquid-applied or sheet waterproofing membrane installed over the substrate, a drainage layer or drainage mat in some systems, adhesive and tile installation, and perimeter, threshold, and movement joints sealed with appropriate polyurethane or silicone sealants.
When a balcony leaks, the failure is usually in the membrane, the perimeter and threshold joints, or the movement joints at structural breaks. Tile cracking alone does not cause a waterproofing failure but can be a symptom. Membrane failure is almost always invisible beneath the tiles until water appears in the ceiling or wall below the balcony.
Econyc carries out balcony waterproofing repairs for both owners corporations and lot owners across NSW. Our licensed technicians conduct a forensic investigation to identify the exact failure mechanism before any repair is proposed, and we provide documentation suitable for strata dispute resolution and NCAT proceedings if required.
Strata balcony waterproofing repairs require careful management of access, noise, resident communication, and documentation. Econyc’s process for strata jobs reflects these requirements.
Balcony waterproofing is an external application exposed to weather, UV, thermal cycling, and foot traffic. The products must perform under these conditions without degrading, lifting, or cracking. Econyc uses only products with proven external performance in the NSW climate.
For balcony membrane systems, primary products include Tremco TREMproof 201 (a two-component polyurethane deck coating membrane with high elongation and UV resistance), Tremco ExoAir 110 (an air and water barrier membrane for junction waterproofing), and Sika SikaDeck-EZ (a reinforced, brush-applied waterproofing membrane for external decks and balconies). For perimeter and movement joints, we use Tremco Dymonic (a polyurethane sealant with high elongation and adhesion to common balcony substrate materials). All products carry full Australian technical data sheets and are specified by structural and waterproofing consultants on major residential projects.
Econyc provides a 10-year workmanship warranty on all balcony and external wet area waterproofing we install. This warranty is issued in writing with the AS 4654.2 compliance certificate and is backed by our public liability insurance. It covers defects arising from our application of the waterproofing system under normal conditions of use and exposure.
This warranty is particularly important in strata contexts because it provides documentation for the owners corporation’s maintenance records and gives future lot owners or strata managers evidence of when the waterproofing was installed and what protection remains in place. The warranty is transferable on the sale of individual lots and on the transition to new strata management.
The owners corporation says the waterproofing is my responsibility. What do I do?
The starting point is always the strata plan and the relevant by-laws. Where an exclusive-use by-law places maintenance obligations on you as the lot owner, those obligations apply to the surface and finishes but may not extend to the structural membrane beneath. We recommend seeking advice from a strata lawyer and requesting an independent inspection report (which Econyc can provide) before disputing a maintenance allocation.
Can the owners corporation force me to fix my balcony waterproofing?
Under the Strata Schemes Management Act 2015, the owners corporation can issue a notice to comply requiring a lot owner to rectify a breach of by-laws, including failure to maintain an area they are responsible for. If you fail to comply, the owners corporation can undertake the work and recover the cost from you.
How long does a balcony waterproofing repair take?
A standard residential balcony repair (approximately 15 to 25 sqm) involving tile removal, membrane replacement, flood testing, and tile reinstatement typically takes 4 to 7 working days. This includes cure time for the membrane and the 24-hour flood test. Access to the balcony is not possible during this period.
Do I need strata approval to have my balcony waterproofed?
If the balcony or its waterproofing membrane is common property, any work requires owners corporation approval (as a special privilege resolution or executive committee approval depending on cost). If the balcony is lot property and the work is maintenance (not alteration), formal approval may not be required, but notifying the strata manager is standard practice. Econyc can advise on the approval requirements for your specific strata scheme.
Contact Econyc today for a free site inspection and fixed-price quote. Licensed, insured, and fully compliant with Australian waterproofing standards.