How much of the wall should I tank

[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.

 

[Flintstone]

I disagree Paul.

 

[LM]

With what points Andy?

 

[Flintstone]

I disagree that's the best way to tank a shower enclosure is to fit the tray and tank down to it. Surely the best way is to fully tank the wall to the floor, then fit the tray, Silicon it well with a profile tool, then tile.

 

[LM]

When tiling to a tray I prefer it fitted with Classi seal, Silicon that to the wall, overlap it with tanking tape then also the verticals and paste the lot.

 

[monkjack]

Thanks for the replies guys. Appreciate you all taking the time out to help idiots like me 🙂

 

[Flintstone]

Imo the perfect way would be fully tank the wall to floor, obviously tape the corner, fit the tray and Silicon, then apply butyl tape over lapping on to tray which will stick like you know what to the tray

 

[Tile Shop]

I disagree Paul.

Imo the perfect way would be fully tank the wall to floor, obviously tape the corner, fit the tray and Silicon, then apply butyl tape over lapping on to tray which will stick like you know what to the tray

Ok, see your point. So you are still taping down to the shower but painting the membrane beneath as well. Suppose it seems silly not to for the amount of membrane it will use, if for any reason the the tape/Silicon fails. Point taken onboard 🙂

 

[charliesw4]

I like trays fitted using classi seal too (unless the plumber stretches the corner). Then Silicon that to the wall and tanking tape over all internals, joins and the classi seal/tray. Then paste everywhere in the shower to the ceiling.

 

[macten]

I usually only tank to chest height unless I'm feeling generous

 

[Tilerdurden]

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.

I concur

 

[Tilerdurden]

I usually err on the side of caution and tank to around 1600 high and normally take it to a good 300 past wet area. Apply to floor around tray also. Belt and braces every time.