How much of the wall should I tank - TilersForums.com

[monkjack]

Hi all, I'm going to be fitting a new shower. I've read plenty of advice on kerdi vs liquid membrane etc etc, but one question I don't see being asked is how much of the wall should you do - lets say my bathroom is 3m by 3m and I'm putting in a 900mm Quadrant. How much of the two walls that touch would you waterproof - just the bit behind the shower and a "bit more" ? If so, can't the water go "around" the matting/membrane then?

 

[Qwerty]

Usually 300mm past shower area is just fine for most brands

 

[LM]

You should tank inside the wet zone(anywhere that may get wet) from floor to ceiling if using a tray, a wet room is a different matter.

 

[LM]

You pipped me to it Geoff

 

[monkjack]

Yeah it's a stone tray, not a wet room.

 

[monkjack]

So what happens to any moisture that's caught. Does it just trickle down to the (now waterproof) floor and sit there until it evaporates?

 

[Qwerty]

You tank down onto the tray

 

[monkjack]

Now I'm confused. I was under the impression I waterproof - walls and floor - then fit tray on it, tile down to the tray.

 

[macten]

So what happens to any moisture that's caught. Does it just trickle down to the (now waterproof) floor and sit there until it evaporates?

Moisture will just evaporate - If there's water trickling down behind your tiles then you've got problems!

 

[Tile Shop]

Now I'm confused. I was under the impression I waterproof - walls and floor - then fit tray on it, tile down to the tray.

No. It should be tray in first then then the tape in the kit laps down on top, then the membrane goes over the tape, bridging the gap between the wall and the tray, preventing anything getting in between.