Please could someone let me know if I would need to tank my bathroom floor. The sub floor is pine tongue and groove. If I lay 18mm plywood on top of the sub floor and then tile with flexible adhesive. Would I need to tank the floor?

I may also install electric underfloor heating. Any advice would be greatly appreciated?

yes mate tank tank tank

Cheers Gooner59 is there any particular product that you could recommend? the floor area is about 4m squared.

i know topps tiles do that homelux wall and floor matting, not knowing were you are ,plus theres loads on the web just look

hi Boardrider

if you're intending on using the bathroom as a wetroom or know that it will be subjected to a lot of water, then tanking the floor as well as the walls will be a very good idea.

speak to Wetdecs, one of the forums sponsors, as they know a thing or two about wetrooms and tanking

oh and

GRR

Hi GirlRacerRed thanks for the welcome! the room is my downstairs shower room with a normal shower tray. The floor will hopefully not get too wet but you never know.... Thanks for the advice I will speak to wetdecs.

Originally Posted by Boardrider

Hi GirlRacerRed thanks for the welcome! the room is my downstairs shower room with a normal shower tray. The floor will hopefully not get too wet but you never know.... Thanks for the advice I will speak to wetdecs.

No need to tank, waste of time and money if you have a properly installed and sealed shower enclosure. More so with it being downstairs. Screw the ply down at 150mm centres (avoiding water pipes) flexible adhesive and grout should do the rest.

The most regular failure I come across is in the foot of the wall plate. You MUST silicone inside this before you fit the enclosure or water can run inside the wall plate and will leak out at the back of the joint with the tiles. Most enclosures will not tell you to do this. Mistake.

Just to add , with it bieng a shower room , personally i would use a cement backerboard instead of ply...a lot of air moisture and thermal expansion causes ply to expand and contract...the backerboard gives a more stable substrate IMHO...Just another option..

instead of a tanking kit overboard with No More ply water resistant tile backer board 6mm thick then tile with flexi if you want it waterproof just paint with SBR job done...

Originally Posted by smurf21

instead of a tanking kit overboard with No More ply water resistant tile backer board 6mm thick then tile with flexi if you want it waterproof just paint with SBR job done...

hows the sbr going to tank wall/floor intersection ,you need a membrane dude

you dont need to tank the wall he said he had a shower tray and enclosure

if you want to tank using NMPthen you board and seal the walls also..

boardrider, never said shower enclosure dude thats who im talking to

Hi Thanks for all the advice, just to clarify that I do have a shower enclosure to install in the downstairs toilet shower room. I will probably tank the shower enclosure with wetdecs dura-wp product and use sealux trim between the shower tray and the wall tanking.

Is no more ply the way to go? could this be used as a base for the 1200 x 900mm shower tray?

Your going over board with this, if you really need to tank then use Dura-wp on the walls, the floor needs over boarding as your tiling it.

2 options 10mm ply or a cement board on floor............tanking the floor not worth it your base is the collection point................... Cement board is best on the floor in this case but dont be swayed by pretty pictures, they have them in your local DIY / Tile store.....................


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