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Hi chaps, I am laying the floor for my bathroom. I have used 18,, ply on top of joists and noggines at 300mm centeres. I know I was supposed to use 25mm ply but was hard to get. anyway floor seems rigid.

I will be tiling the floor soonish but was wondering if its worth using a tanking kit or matting. This is for a rental property and every place I have every seen the tenants always leave a load of water on the floor

When you guys rip out bathroms do you often find that water has got down below the tiles?

Not unless the tiling was done poorly in the first place john but if you have any doubts about it go ahead & tank it

thanks Paul,

Make sure you use a premium flexible adhesive John with only going with the 18mm ply, you may still get some movement yet

Agree with MT
Tanking not really necessry. I tend to do it only in shower or wet room situations.
Re the adhesive, again I agree. A premium one part flex will prob suffice although in the past , if there is a little doubt, I have used the extra flexible 'Ultimate flex' from Granfix. Bit expensive though -- £45/50 ?? to do about 4 sq mt --- mind you , bal ordinary flex prob costs that anyway !!

cool, I have always noticed in any rented house I have been in tenants leave pools of water on the floor which I was wondering if it makes it way down through the tile grout.

Is tile grout total impervious to water?

I wouldn't say 100% totally impervious John, most of the manufacturers say water resistant, which is a splash here & there that can be wiped up within a reasonable amount of time, they don't say waterproof! Unless you use an epoxy grout which will guarantee 100% waterproof

Cheers Paul,

I have used aquapanel so am going to tank than anyway as water seeps through that pretty quick. Will do the shower area only

Actually just on this topic, I actually D'n'D the aquapanel and secured it with with 10mm Fisher plugs and screws. (I know you are supposed to frame fix aquapanel but just didn't have the room for a frame)

In any case, I noticed that when using direct bond method with LOTS of adhesive, the aquapanel was well suck to the wall. Mechanical fixing afterwards seems a touch unnecessary but went and did it anyway.

Best you did John, never unnecessary & the right way to do it