Leaking showers are the single most common hidden water problem we're called to across Shellharbour, Warilla, Albion Park, Kiama and Wollongong. The water almost never shows up where the fault is — it tracks along the bed and screed, then appears in a hallway cupboard, on the other side of a bedroom wall, or as a stain on the ceiling below an upstairs ensuite.
The five things that actually leak in a shower
- The shower mixer or tap body inside the wall — a perished O-ring or a cracked body weeps constantly whether the shower is running or not.
- The shower waste (floor drain) — where the waste flange meets the puddle flange, a common failure point in showers built before modern sheet membranes.
- The waterproofing membrane — if the membrane was skipped, poorly lapped at the junctions, or damaged during tiling, water in the bed has nowhere to go but out.
- Grout and silicone joints — the easiest to blame and often the least serious; they let water through but only fail badly when the membrane behind them has already gone.
- The wall junction where the shower screen meets the tiles — usually a silicone maintenance issue rather than a structural one.
Signs the leak is inside the wall, not on the surface
If the damp patch is worst when nobody has used the shower, suspect the mixer body or a supply pipe in the wall — that's a pressurised leak that doesn't need the shower running. If the damp only appears after a long shower and dries out over a day or two, the water is getting past the floor level: waste, membrane or screed.
The tests we run before touching a tile
We flood-test the shower base with the waste plugged and monitor the surrounding areas, run a separate test on the waste itself, then isolate the mixer and watch for pressure loss. Where the leak is behind a wall or under a slab we use moisture meters and thermal imaging so we open one targeted access hole instead of exploratory demolition. For upstairs bathrooms leaking into a ceiling below, that diagnosis is the difference between a small repair and a full ceiling replacement.
Repair options, from least to most invasive
- Re-seal and re-grout — appropriate only when testing shows the membrane is intact and the joints are the sole fault.
- Replace the waste and re-seal the floor junction — done through the existing floor tile in many cases.
- Rebed and re-waterproof the shower floor with new floor tiles, keeping the wall tiles — the most common middle-ground repair.
- Full strip-out, new membrane and retile — the right call when the membrane has failed across the shower or the wall framing is already affected.
Why older Illawarra bathrooms fail in a pattern
A lot of housing stock through Warilla, Barrack Heights, Oak Flats and older Wollongong suburbs was built before sheet and liquid membranes became standard, relying on a sand-cement bed and a lead tray. Those trays last decades and then fail at the corners. If your bathroom is original to a 1960s–1980s home and you're seeing damp skirting, expect a membrane conversation rather than a tube of silicone.
What ignoring it costs you (in damage, not dollars)
Water tracking into wall framing rots bottom plates, lifts floating floors in the next room, delaminates particleboard flooring in upper storeys, and grows mould inside wall cavities you can't clean. It also compounds: by the time a leaking shower has damaged framing, the repair scope is structural, not plumbing. Early diagnosis keeps it small.
How we handle it
You get a written scope after testing that states exactly which component failed, what we're repairing, and what we are not touching. If tiles need to come up we tell you before we start, and we photograph the membrane and the waste junction as we go so you have documented evidence for strata, insurance or a future sale.
Frequently asked questions
- How do I know if my shower is leaking or it's just condensation?
- Condensation dries out within hours and appears on cool surfaces evenly. A leak leaves a persistent damp patch that reappears after shower use, often at floor level on the outside of the shower wall, and may swell skirting or lift paint.
- Can a leaking shower be fixed without removing the tiles?
- Sometimes. If testing shows the waterproofing membrane is intact and the fault is the waste, the mixer or the joints, we can often repair through existing tiles. If the membrane has failed, the floor needs to be rebedded and re-waterproofed.
- Is re-grouting enough to stop a leaking shower?
- Only when the membrane behind the tiles is still sound. Re-grouting a shower with a failed membrane hides the symptom for a few months while water keeps tracking into the wall framing.
- Why is water showing up in the room next to my bathroom?
- Water that gets past the shower floor travels through the mortar bed and screed to the lowest point it can escape from, which is commonly the wall junction into an adjoining room or hallway, not the shower itself.
- Does a leaking shower need a licensed plumber in NSW?
- Yes for anything involving the waste, supply pipework, the mixer or the waterproofing of a wet area — it's regulated work under AS/NZS 3500 and NSW waterproofing requirements.
- Do you repair leaking showers across the Illawarra?
- Yes — Shellharbour, Shell Cove, Flinders, Warilla, Barrack Heights, Albion Park, Oak Flats, Dapto, Kiama and the wider Wollongong area.