Flexing wet room floor - Tile Advice

homeowner77 · Mar 14, 2023

The mosiac tiles near to the drainage area are flexing quite a bit. We can see the drain moving up and down too. The grouting is cracked in places.

What's going on?
Is there not enough support underneath the shower tray?

Any help much appreciated.

Dave · Mar 14, 2023

What type of wet tray is it and what size of mosaics ?

homeowner77 · Mar 14, 2023

It is a foam tray (sorry no more details than that) and the individual mosaics are 2.5cm sq.
I've just been reading that they should be 5cm sq....is this correct? Could this be making the area around the drain too flexible and causing the cracks?

Slippery · Mar 14, 2023

How long has it been down?

homeowner77 · Mar 14, 2023

It's been down around 6 months

Slippery · Mar 14, 2023

Possibly the drain holes in the waste filled with adhesive, the water flows to the drain under the tiles but can't escape through the waste.

Dave · Mar 15, 2023

The issue with small mosaics on a foam tray is point loading, the tray is at it thinest towards the drain. So larger mosaics prevent crushing of the tray. But the drain itself should not be moving. The issue could be installation error as the drain needs support underneath to prevent collapsing.

Flexing wet room floor - Tile Advice

homeowner77

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Dave

TF

homeowner77

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Slippery

TF

homeowner77

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Slippery

TF

Dave

TF

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