TARARA GUIDE

Signs Your Bathroom Needs Re-Waterproofing

Why waterproofing fails in the first place

Waterproofing doesn’t usually fail because of one dramatic event — it wears out, or was never done properly to begin with. In older homes, the wet area may have no proper membrane at all, just tiles and grout doing a job they were never meant to do. In newer ones, the common culprits are movement (houses settle, and a rigid membrane can crack), silicone and sealant simply ageing, or a rushed original install where the waterproofing was cut short to save a day on site.

1. Water stains below the bathroom

The clearest sign is a mark that has nothing to do with the bathroom itself — a brown or yellow stain on the ceiling of the room below, or on a nearby wall. That’s water that has passed straight through a failed wet area and travelled. If your bathroom is upstairs and the ceiling underneath is staining, treat it as urgent.

Marko’s tip: “A leaking shower rarely fixes itself — the water’s already getting in somewhere. The sooner you catch it, the smaller the repair. Leave it a year and you’re often replacing framing, not just re-tiling.”

2. Cracked, loose or hollow-sounding tiles

Tap gently across the wall and floor tiles. A solid tile gives a sharp sound; a loose one sounds hollow. Cracked grout, tiles that move, or a hollow note usually mean water has got underneath and broken the bond. On a shower floor especially, that’s a direct path to the waterproofing below.

3. Mould that keeps coming back

Everyone gets a little shower mould. The warning sign is mould that returns within days no matter how often you clean it, or that spreads along the base of the wall and into the grout lines. Persistent mould means there’s constant moisture where there shouldn’t be — often because water is sitting behind the tiles instead of draining away.

4. Dark, damp grout and peeling silicone

Grout that stays dark and damp long after the shower’s been used, or silicone seals that are lifting, cracking or going black, are telling you the seal has broken. Silicone around the shower tray and where the wall meets the floor is the first line of defence — once it fails, water gets straight into the joint.

5. A musty smell or a soft floor

Trust your nose and your feet. A musty, damp smell that won’t clear, or a bathroom floor that feels soft, spongy or slightly springy underfoot, points to water damage in the substrate below. By this stage the problem is usually well established — but it’s still far cheaper to fix now than after the floor gives way.

What to do if you’ve spotted one (or more)

In practice it usually starts with a photo or two, then a look on site to check whether the membrane is the problem. From there you get a clear, itemised quote — whether that’s a reseal and regrout or a full strip-out and re-waterproof — so there are no surprises. A small reseal is a quick job; a full re-waterproof is more involved, but it’s done once and done properly.

At Tarara Tiling we repair leaking showers and re-waterproof bathrooms across Auckland — and because Marko is an approved PS3 Producer Statement author, a re-waterproofed wet area can be documented to the New Zealand Building Code. See our tile repairs and waterproofing pages, or just send us a photo.

Frequently asked questions

Can you fix a leaking shower without re-tiling the whole thing?

Sometimes. If the tiles and membrane are sound and only the silicone or grout has failed, a reseal and regrout can do it. If the waterproofing membrane underneath has gone, the only lasting fix is to strip back and re-waterproof. We’ll tell you honestly which one it is.

How do I know if it’s the waterproofing or just the grout?

Grout is porous by design — it’s the membrane behind it that keeps water out, not the grout. If new grout keeps failing, or you have stains appearing elsewhere, the membrane is the more likely culprit. A quick look on site usually tells us.

How long should bathroom waterproofing last?

Done properly with a quality membrane, waterproofing should last the life of the bathroom. The parts that wear sooner are the silicone seals, worth checking and replacing every few years as cheap insurance. If a bathroom is only a few years old and already showing these signs, it usually points to a problem with the original install.

How much does re-waterproofing a bathroom cost?

It depends on the size of the area and how much needs to come out. Rather than guess, we give a clear, itemised quote once we’ve seen it — you can send photos to start.