If you notice water appearing around or underneath your shower tray, the cause is usually a failed seal, loose drain connection, or tray movement rather than a burst pipe.
Water under a shower tray should be investigated quickly to prevent long-term damage.
The Most Common Reasons This Happens
1. Failed Silicone Seal
Over time, silicone around the tray edges can crack or separate from the wall.
When water escapes behind the seal, it may travel underneath the tray.
This is one of the most common causes.
If water is leaking into the ceiling below, see:
→ Why Is My Shower Leaking Through the Ceiling?
2. Loose Drain Connection
The waste pipe beneath the tray can loosen slightly.
Leaks often occur when water is actively draining.
If water pools during showering, see:
→ Why Is My Shower Not Draining?
3. Shower Tray Movement
If the tray is not fully supported underneath, stepping on it can cause slight flexing.
Even small movement can break seals over time.
4. Cracked Tray
Hairline cracks in acrylic trays can allow water to seep through slowly.
5. Grout or Tile Waterproofing Failure
Water can travel behind wall tiles if grout is cracked or waterproofing has failed.
Is This Serious?
It may be minor if:
- The leak only appears during use
- The silicone looks visibly worn
- The area dries between showers
It may require urgent attention if:
- Flooring feels soft
- Water spreads beyond the tray area
- Ceiling damage appears below
Ignoring under-tray leaks can damage subflooring and joists.
What You Can Do
If water is coming from under your shower tray, you can:
- Inspect silicone joints
- Check for tray movement
- Monitor whether leaks occur only while draining
- Avoid using the shower until the source is clear
If the leak source is hidden or persistent, professional inspection may be required.
For related issues, see:
→ Shower Problems Explained
→ Plumbing Problems Explained