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Home > DIY How To Projects and Tutorial Guides > Reparing the Leak From a Shower Tray – How to Repair a Leaking Shower Tray and Also Leaks in Shower Tray Waste Pipes

Reparing the Leak From a Shower Tray – How to Repair a Leaking Shower Tray and Also Leaks in Shower Tray Waste Pipes

How to get under a shower tray to repair a leak. In this project we show you how to identify leaks from a shower tray, whether they are from the tray itself e.g. worn sealant or whether it's from the pipework supplying the water feed to the shower, if indeed the pipes are embedded in the wall. Additionally if it is found that neither sealant failure or pipe failure in the walls are the cause then in most cases it will be down to the shower tray waste and we will show you how to access this a shower tray waste through the ceiling in the room below.

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Repairing a leaking shower shower tray or waste trap leak is one of the most horrible of DIY jobs as the destruction often required is heartbreaking.

When installing a shower tray it is, wherever possible, a huge advantage to place the tray on a firm base made of timber which allows access to the trap and pipework underneath. If this is the case with your shower it is relatively easy, and not hugely destructive to remove the front or sides of the base to get at a waste trap leak.

Shower tray mounted up on timber base

Shower tray mounted up on timber base

How To Install A Shower Tray To Avoid Any Waste Leaks

We always suggest that a shower tray is installed before any walls are tiled as this allows for a much more water tight joint.

Position the shower tray in it’s desired location and make sure it is level by using a spirit level. If it is out of level use some packing such as timber slivers or plastic packing pieces to get it level. This is very important!

The bottom of the tray is sloped to make sure the water runs out of the waste so you do not need to tilt it in any way.

Assemble and insert the waste to the shower tray and then connect it to the pipework that you have run from the waste escape. The tray should also sit on a bed of sealant on a timber frame.

Whether the tray is sitting on legs or on a base, the waste should be placed in a position where it can be accessed when necessary.

The front (in the case of mounting on timbers) can then be covered by simply fitting skirting board across the supporting timbers and then even tiled over if you wish.

If you are tiling over them make sure you devise some way of easily removing the skirting face so that you can then access the waste pipes.

Finding The Leak That Needs Repairing

If the tray has been fitted straight onto a floor and it develops a leak you must first decide where the actual leak is coming from.

If its from the pipework behind the tiles there is a good chance this will be noticeable by brown stains appearing in the grouted joints of the tiles.

If there is no evidence of pipes leaking then it is either the seal between shower tray and walls or the waste pipe connection under the tray. If you think it is the seal, then see our project on leaking shower or bath.

Repairing A Shower Tray Leaking Waste Trap

If you think its the waste from the shower tray then there are two choices.

  • You can remove the shower surround and take out the tray by taking off the first two courses of tiles. Obvioulsy quite a lot of work and expense involved in this method plus that fact that the shower and possibly the bathroom will be unusable for the duration of the repair
  • You can go downstairs and remove the section of the ceiling below the shower tray. While this may seem the most drastic of jobs, it is very often the easiest way to deal with a leaking waste. This can even apply to some baths which have been put in with no access to the waste pipes
shower waste trap and pipework exposed through ceiling below

shower waste trap and pipework exposed through ceiling below

See our project on repairing ceilings and you will see that the repair is not so difficult while, at the same time, making work on the actual tray and waste pipes very easy.

All project content written and produced by Mike Edwards, founder of DIY Doctor and industry expert in building technology.

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Related Projects That May Help You:
  • A Guide to Fitting Waterproof Shower Panels and Choosing Decorative Panel Board in Bathrooms and Shower Enclosures
  • How to Fit a Sink, Basin, Shower or Bath Waste Pipe – Understanding Waste Pipe Systems
  • Fitting a Shower Tray – How to Fit a Low Level or Low Profile Shower Tray in a Bathroom
  • Leaking Shower or Bath – How to Repair Leaking Shower Trays and Baths and Prevent Damage to Floors and Ceilings
  • Different Shapes and Types of Shower Tray, Common Construction Materials and Types of Shower Waste
  • How to Fit a Raised Shower Tray in a Bathroom
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