i have intalled a wet ufh system to a new extension. battened out joists,layed down kingspan layed down ufh system ,covered with a 8 to 1 dry biscuit mix and the put 18mm wpb ply down. what do i do next?
what prep work do i need to do? and most importantly what adhesive and grout do i use?
i do not want any cracks in the grout etc. i wnat to give the floor the best chance. i'm using ceramic tiles.

many thanks

is there anybody out there?

If you want to really be sure then consider laying a decoupling membrane on your ply first then tile on the top. This will isolate the tiled surface from lateral thermal movement giving you a much better chance of success. Check out Durabase from Wetdecs or Schluter Ditra for info.

Sorry there, didn't see this post ....


I would use an uncoupling membrane on top of the ply.....this will prevent any lateral stress from cracking the tiles...

thnkyou both, will probably use the Schluter Ditra matting would i still need to use flexible adhesive and grout and could you reccommend any, also best places to buy both products. thanks again, i was starting to panic.

Mapei keraquick adhesive.......mapei ultra colour plus grout both available from tile giant/tile it all....

Mapei Keraquick with latex plus for timber floors would be my choice. You may get away with not using the latex plus additive but it is better with it.

i am tiling onto ply,do i need to prepare it first i.e. seal it or put some kind of bonding on it or both.
cheers phil

Originally Posted by philips

i am tiling onto ply,do i need to prepare it first i.e. seal it or put some kind of bonding on it or both.
cheers phil

The ply should really be sealed on the underside and edges before fixing to the joists, this helps keep it more moisture stable. The tiling face doesn't need to be primed.

Hi
What do you use to seal the board, I've got some pva

oops just seen posts on pva i'll get some acrylic primer