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How to Tell If Your Shower or Bathtub Is Leaking

How to Detect Shower or Bathtub Leaks

A relaxing shower or bath is meant to wash your worries away, not bring on new ones. But what if, behind those tiles or beneath the tub, a slow, hidden leak is causing damage you can’t see? Leaks from showers and bathtubs often go undetected. They don’t gush like burst pipes or leave puddles in the hallway. Instead, they quietly seep into the floor or walls, gradually warping timber, damaging tiles, and even leading to mold growth or costly structural repairs. At SWR Plumbing, we’ve helped countless homeowners catch these leaks before they became bigger problems. Here’s how you can do the same. 

Why Shower and Bath Leaks Are Tricky

Unlike other plumbing leaks, the ones behind or beneath your shower or tub often start small and remain out of sight. The water may be escaping behind tiles, under vinyl, or into wall cavities. That means you won’t always notice dripping water or puddles-but the damage is still happening, bit by bit. This makes early detection crucial. If you can spot the signs and act quickly, you can avoid extensive repairs and keep your bathroom safe and dry.  

What to Watch For: Common Signs of a Leak

1. Tiles That Won’t Stay Put 

Loose, cracked, or bulging tiles around your shower or bath are a telltale sign that water is getting where it shouldn’t. The adhesive holding the tiles in place breaks down when exposed to constant moisture, causing them to shift or fall off.  2. A Musty Smell That Lingers

Mould and mildew thrive in damp, dark spaces. If you keep smelling something musty no matter how clean your bathroom is, moisture could be building up behind the walls or under the floor.  3. Water Stains or Bubbling Paint

If your bathroom is upstairs, check the ceiling below. Water leaking through floors can cause yellow or brown stains, peeling paint, or bubbles in the ceiling plaster. That’s often a late-stage sign of an ongoing leak.  4. Soft, Sagging, or Uneven Floors

When the flooring near your bath or shower feels spongy or uneven, it could mean water has seeped under the tiles or vinyl and is damaging the subfloor. If left alone, this can lead to serious structural issues.  5. Silicone and Grout Problems

Check the edges of your bathtub and the corners of your shower. If the silicone sealant is cracking, peeling, or missing altogether, water can escape through those gaps. Damaged or missing grout between tiles can have the same effect.  6. Unexplained Water Around the Tub

Seeing small puddles or damp patches near the base of your shower or bath after each use? Even a minor drip or splash-back can point to a larger issue with the waterproofing or pipework.  7. Your Water Bill Is Creeping Up

If your water usage has gone up but your habits haven’t changed, there might be a slow leak behind the wall, sending water down the drain- along with your money. 

What Causes These Leaks?

There are several possible culprits behind shower or bathtub leaks, including: 

  • Cracked or missing tile grout 

  • Worn-out silicone seals around the edges 

  • Poor waterproofing behind the walls or under the shower base 

  • Corroded or loose pipe connections 

  • A damaged shower tray or bathtub base 

  • Faulty taps or plumbing fixtures 

Many of these issues can go unnoticed during installation or renovations, especially if waterproofing work wasn’t done to Australian standards.

What You Can Do Right Now

There are a few simple checks you can do yourself: 

  • Wipe the area dry, then return an hour later to check for moisture 

  • Place a dry towel near the base of the tub or shower- if it’s damp later, you may have a leak 

  • Look for recurring mould in the same areas 

  • Keep an eye on your monthly water bills 

These signs won’t confirm the source of the leak, but they do suggest it’s time to get a plumber in for a closer look.

Why You Shouldn’t Delay

Small leaks can quickly turn into major problems. Beyond visible water damage, you’re also looking at the risk of: 

  • Long-term timber rot 

  • Weakened wall structures 

  • Costly flooring replacements 

  • Health hazards from mould and mildew 

  • Loss of property value if left untreated 

Get Peace of Mind with SWR Plumbing

If you suspect a leak in your shower or bathtub, don’t wait until it shows up on your ceiling or warps your flooring. At SWR Plumbing, we use professional leak detection tools- including thermal imaging and moisture meters- to pinpoint the source without unnecessary damage to your bathroom. Whether it’s a failed seal, a leaking pipe, or a waterproofing issue, we’ll fix it properly and help prevent it from happening again.

📞Call SWR Plumbing now at 1800 255 372

🌐Visit SWR Plumbing to book your inspection

Your bathroom should be a place to relax, not a hidden water hazard. Trust SWR Plumbing to keep it safe, dry, and leak-free.