Shower Tiling problem

[Grahamc1]

That's where I came. Basically he says the loft extensions is mainly wood, which is bound to expand and contract, but if we'd used heavier tiles they wouldn't have cracked. Which sounds like rubbish to me. Apart from wishing I'd come on here earlier, what's the best way to find someone local who knows what he is doing to take a look?

 

[AliGage]

There's a "looking for a tiler" section on this forum. You could try there?

 

[SJPurdy]

When plywood is used as a substrate for wall tiling then as far as I can remember (my online library access seems to have disappeared so I can't check) British standards recommends that it should be limited to small areas that can be made from one sheet, and that if there are joints in the sheets then they should not be tiled over (unless a movement joint is put in). Where plywood is used it should also have been coated on the reverse (un-tiled) side and all edges with a suitable primer/sealer - which in my experience never happens.

 

[Stef]

This install has failed because they have used Ply in a shower area,
End of.

Listen to Dave, it's down to expansion of the substrate,

Ply is not suitable in a wet environment, ie shower, it expands & contracts & that's why the line has appeared along the joint in the substrate.

The builder would have been better off using plasterboard, even without tanking it would have lasted longer.

Builders think that if they use Ply then it strengthens the wall.

This failure is down to the builder.