What material to tile on - Bathroom floor

Hurley6969

I am just wondering what is the best material to use on the bathroom floor upstairs to tile onto. The floor boards are in good nick but on ripping out the old tiles there was a sheet of ply down that must have been only 5ml max. There was cracking on the tiles and grout.
I was looking at tile backer board/cement board or else thicker ply to put the new tiles onto. Has anyone experience of using either or an alternative?
Cheers

MackMack

For a bathroom, 5mm ply is useless. Might as well not be there. I'll be doing my bathroom soon and am planning on using either 3/4" (maybe 1") marine ply or more likely 12mm no more ply as the base.
I used 9mm no more ply in my ensuite 2-3 years ago and haven't had any problems with it. No cracking of the grout at all (yet).

peter bermingham

Screw down whats was under the ply that you took up and screw it well then put down 12mm ply going the opposite direction to the floor boards and screw that down well then tile

agusta

Nearly all the ply coming into ireland is coming from china,some shops call it wbp,buts it not.if tiling onto timber it must be the proper wbp plywood or marine plywood,not simply cheap plywood.Best job by a million miles is cement board

agusta

Hurley6969 wrote: »

I am just wondering what is the best material to use on the bathroom floor upstairs to tile onto. The floor boards are in good nick but on ripping out the old tiles there was a sheet of ply down that must have been only 5ml max. There was cracking on the tiles and grout.
I was looking at tile backer board/cement board or else thicker ply to put the new tiles onto. Has anyone experience of using either or an alternative?
Cheers

Normally when you see the grout cracking and coming out,the tile wasnt fully bonded or not bonded to the floor underneath

Armchair Andy

agusta wrote: »

Nearly all the ply coming into ireland is coming from china,some shops call it wbp,buts it not.if tiling onto timber it must be the proper wbp plywood or marine plywood,not simply cheap plywood.Best job by a million miles is cement board

Never heard of it, just looking at it elsewhere, saucy pricewise. How is it fixed?

agusta

You can screw it down at 6 inch centers,its not pricey in the long run

greasepalm

i was told to use jackoboard if putting tiles down

agusta

There ok too,they have a synthetic modified coating which is reinforced with a glass fibre mesh,lighter,easier to work with but more expensive

Hurley6969

Cheers for all the replies. Looks like tile backer board is the way to go.
Seen Right Price Tiles have No More Ply 6 mil for €10 or 12 mil for €13.50. Haven't got to the local builders providers yet. What would be the going price?
Any major difference between the 6 and 12 mil worth nothing? It says the 6 mil is a substitute for 18mil ply so is there are need to go to 12 mil on the tile backer board?
In terms of use, the entire floor and shower unit walls would be tile backer board, would the rest be ok with normal plasterboard as its not a wet room.

agusta

Yes the rest of bathroom in plasterboard,also you can use the plasterboard in the shower area and use a tanking kit

e.r

A