3mm plyon floor?

[kickkick]

Howdy folks

I have another quiestion this time about 3 mm ply.

I know 3 mm ply shouldn't really be used in the tiling trade as its too thin, but was wondering if it can be used as a liner to protect a chipboard floor.

For example I have a small 2m square bathroom floor to tile in a 4 year old new build house.
The current floor is carpet which is the same in everyroom.
I wanted to keep the new height level to a minimum, so was planning on takeing up the carpet, screw down the current chipboard floor to make sure it's well fixed with more screw's and line with 3 mm ply making sure that is also fixed down properly and then use ditra matting on top and then tiles.

I want to keep the hight level to a minimum and also wanted to preserve the current subfloor and felt 3 mm ply used as a liner could be a solution?

Many Thanks
Karl.

[Dave]

3mm ply is not moisture/thermaly stable IMO..........

[div]

Nooooo.......9mmm min sbr underside an sides...if ur gettin ply from b&pee make sure its not contamimaited i.e oil an other s"£$t on it had few like that on last job....best off

[mikethetile]

your going to have to fit a threshold any way

6mm backer would only increase by 3mm and would be stable

[kickkick]

your going to have to fit a threshold any way

6mm backer would only increase by 3mm and would be stable

I did have a feeling 6mm backer board would be better.

Do you think I should still use the Ditra on top of the 6mm board.?

[tile55]

I did have a feeling 6mm backer board would be better.

Do you think I should still use the Ditra on top of the 6mm board.?

Yes. Also don't forget to use flexi addy and grout.

[kickkick]

Yes. Also don't forget to use flexi addy and grout.

Thanks. Yea I always use flexible adhesives and grouts when it comes to tiling on floors. I've seen the after results of fools who have not and not gonna let my work end up like that.

[robbbin]

I use Topps 6mm hardbacker its come down in price only £7 A SHEET NOW

[Alpha Omega]

Sorry if its a dumb question,

Why can't you just use Ditra mat & flexi addy direct on the floorboards, if they have been secured ?

[Dave]

you can as long as its solid...

[pete f]

easier to screw 6mm backer board down alpha and you wont get movement issues

[Dan]

Check to see if that chipboard is the green-coloured stuff, which they use in new builds on the floors, as it's treated and isn't as dodgy as normal chipboard. I think most tile adhesive manufacturers sort of class it as normal tongue and groove as it's only as porous as that. Doubly-double check that though.