want to tile kitchen / dining room / WC - different substrates - help

[Corez]

Want to tile a new kitchen / dining room / WC with ceramic floor tiles.

Kitchen has an area where the wall was which is concrete (1metre x 2metre) Builders have screwed plywood board down over the rest of the wooden floorboards and also the WC has concrete around it. Builders say they dont think we can have it tiled as it will crack where the 2 surfaces meet.

Any ideas ? We could chip away some of the concrete and screw ply ontop ??

 

[AliGage]

Hi and welcome Corez.

Can you post a couple of pictures of the rooms/areas to be tiled. It will give us all a better idea of what you're up against.

 

[Dan]

You would need some form of expansion gap where the wood meets concrete. Though as you say you could screw ply over the lot, or chip the concrete away and screw ply to keep it flush with the existing wood.

If it's a nice and even square though (I guess it isnt?) you would get away with using an expansion strip where the two meet, and then tile either side of it using different adhesives.

 

[swanman]

Hi and welcome to the forum:welcome:

 

[Ste-Armer]

Hi,
i think you could use a 6mm backer board and go over the whole lot and make the board overlap the joint between the two rooms. This should stop the floor cracking and @ 6mm won't raise the floor too much.

 

[Gazzer]

Hi,
i think you could use a 6mm backer board and go over the whole lot and make the board overlap the joint between the two rooms. This should stop the floor cracking and @ 6mm won't raise the floor too much.

You will still need an expansion joint IMO.