Signs of a Leaking Balcony in Melbourne

A leaking balcony rarely announces itself where the leak actually is: the Commission's guidance notes that signs can show on the same floor as the balcony or on the level below. Waterproofing, drainage, falls, set downs and detailing all have to work together, and a balcony is a high-risk building element because it depends on every one of them.

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What leaking balcony repairs in Melbourne actually involves

The Commission's own list of signs starts with efflorescence, the white mineral salts that leach from concrete or render with moisture and crystallise on drying. Movement in floor tiles, cracked grout or a tile that sounds hollow is another. Water marks on an exterior wall can point to a blocked balcony drain, inadequate falls or improper capping. Ponding, water that neither drains nor evaporates in a reasonable time, points to inadequate fall or drainage and increases the potential for water damage. On the underside of the balcony, rust stains on exposed steel reinforcing are signs of a serious problem.

Why it happens

The Commission names the usual waterproofing defects as thin or poorly applied membranes, missing terminations and fillets, poor substrate preparation and inadequate protection, and the usual drainage defects as undersized outlets and overflows, incorrect falls and ponding, and overflows not terminating to atmosphere.

White salt crystals hanging from the underside edge of a concrete balcony slab, with hairline cracks and a damp patch beside them — leaking balcony signs, Melbourne. Illustrative example.

What to do about it

If you are worried about the stability of a balcony, deck or balustrade, the Commission says to avoid the area, restrict access and contact a structural engineer or another suitably qualified building practitioner. Otherwise it recommends engaging a registered builder or a structural engineer for professional advice on the rectification. It recommends a visual check of balconies each year, and says keeping drains and overflows unblocked, clean and functioning at full capacity is one of the few things an owner can do without a trade.

A slow outlet is a plumber's job

The Commission says to engage a licensed plumber if the balcony outlet does not discharge completely, or is slow to discharge after rain, as this may indicate a blocked outlet or drainpipe. Plumbing work must be done by a plumber licensed or registered for that class of work. The main page covers registration and permits.

Look at the underside of the balcony and the level below as well as the floor, and have it assessed rather than judged from a photo.

Cracked grout lines and one grey floor tile lifting at its edge to show dark material beneath, on a balcony with a metal railing — leaking balcony signs, Melbourne. Illustrative example.

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