Top 5 Signs of Poor Waterproofing in Sydney Homes

Waterproofing issues often start small but quickly become expensive. Spotting them early can save homeowners serious stress and repair costs.

1. Persistent Damp or Mould

If you notice damp patches or black mould around ceilings or bathroom corners, the waterproofing membrane may have failed. Moisture is escaping behind tiles or through cracks.

2. Cracked or Lifting Tiles

Movement in the slab or incorrect preparation causes tiles to lift — a tell-tale sign of poor waterproofing beneath.

3. Bubbling Paint or Swollen Timber

These show water is travelling beyond wet areas, often from showers or balconies above.

4. Efflorescence on Concrete or Balcony Floors

Those white chalky marks indicate water is seeping through concrete pores.

5. Leaks After Rain

Balconies and roofs that leak after heavy rain often have failed junctions or inadequate drainage detailing.

At Wattaproofing Excellence, we diagnose these issues using moisture meters and membrane thickness testing, then provide a permanent fix, not a patch.

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