Hi,

I'm currently planning on installing a Wet room soon and I've been researching on the various tanking/waterproofing methods.

At the moment, this is the setup of the existing bathroom/toilet.

The whole room is L=2700 x W= 1200mm and the wet room area to be used will be L 900 x W 1200mm.

The left & right side of the bathroom are boarded and the back is a brick and all areas has been tiled....see attached pics.

New Wet Room Installation

I'm planning on removing all the tiles, board the whole shower/wet areas including the existing back brick wall with Marmox waterproof Tile backer board of thickness 12.5mm. The floor at the moment has got a 20mm place on the wooded floor.

Issues at the moment

Thinking of using the Impey Membrane products but from what they say, they dont recommend using the membrane on the wall if you will be tilling to some certain weight, think 20kg etc.

On top of the 20mm board on the floor, i'm planning on using the Marmox board maybe 6-10mm thick to cover the existing floor board, which will flush and be levelled with the shower tray/aqua dec tray.

I'm trying to get the best tanked/waterproof wet area so my questions now are:

1. Will using Marmox tile backer boards (12.5mm thick) to water proof the walls will be ok? (remember the left & right walls are boarded and the back is bricked)

2. What is the suitable thickness of Marmox tile backer board to use ontop of the existing floor board or this is not needed?

3. As mentioned, Impey doesnt recommend using their Tilesafe membrane roll on walls but is this possible to use as i will be using the tilesafe on the floor areas and will also like to use it on the wall as I saw a programme on BBC cowboy traps whereby the BBC team/tiler used the tilesafe on the walls and floor.

4. What is the suitable adhesive to use in holding the tile backer boards to the walls?

My intended installation method (Want it to be as tanked/waterproof)

1. Board the walls using Marmox waterproof tile backer boards (12.5mm) thickness
2. Board the existing floor (20mm) thick with a Marmox tile backer board with 6mm thick. OR should i use plywood on the existing floor board?

Then follow the Impey installation (as shown on Impey website video instruction/installation)

3. Apply Impey joining tapes/corner tapes along the edges of where the tile boards meet together.
4. Prime the whole area.
5. Use the Impey Tilesafe membrane on the walls and floors to cover the aqua dec/shower tray.
6. Use the silicone/jointing compound.
7. Lay the underfloor Devi mat.
8. Tile the whole wall/floor with Travertine tiles from Wickes.

So my main concern is can I use the marmox tile backer baords on the walls and as well use the tilesafe membrane on the wall/floor? If i can not use the tilesafe on the wall, what would you recommend i use or should I just use a primer to prime the surface and use alternative liquid base membrane then install tiles?

Many thanks for your time reading this and any inputs will be highly appreciated.

Thanks

I am using the Impey tile safe at the mo, in a wetroom. Good stuff but can be tricky to work with. Not recommended for walls weight issues etc. When you say silicone you do mean the mastic that comes in the kit? silicone is not compatable with tile safe membrane

Hi Phil,

Thanks for the quick reply.

Well I havent bought the Impey products yet but think it will be the mastic one you mentioned. So i guess it is clear now not to use the tilesafe on the walls? So what would you recommend I use? I'be have of the Mapegum or will the yellow tanking fleece from wickes do?

Wonder why the BBC tilers used the tilesafe membrane on the walls in one of their wet room installation they filmed!!

So do you think my installation method will be good enough (tile backer board on walls/floors with the thickness) apart from using the tilesafe on the walls?

what tanking products/membrane do you use for your walls?

I have used Mapei Gum in the past, good stuff. But some prefare a membrane, if done correctly both are OK

So do you think the method I will be using is a good one with the Marmox tile backer boards on the floor with the thickness 12.5mm on the wall and 6mm laid on the existing 20mm board?

Also will be using the mapei gum to tank the wall then use the tilesafe membrane on the floor cos i want to use the Impey recommended Dev under floor heating mat as well.

yup, just put the tilesafe 75 mm up the wall

thanks faithhealer!

Cool....i will research more on the mapei as well. Your comments has been very helpful but one other question, wot adhesive would be good or the ones you use to stick the tile backer boards on to the wall? and the grout to use for the Travertine tiles?

would screw the backer boards to batons.
Mapei jasmine' ultra colour plus looks good with trav. Use Jasmine matching silicon as well

I only use Homelux matting system suitable for wood / concrete easy to use .you can tank a large room in a couple of hrs and tile straight away no prob

Originally Posted by Skilachi

Hi,

I'm currently planning on installing a Wet room soon and I've been researching on the various tanking/waterproofing methods.

At the moment, this is the setup of the existing bathroom/toilet.

The whole room is L=2700 x W= 1200mm and the wet room area to be used will be L 900 x W 1200mm.

The left & right side of the bathroom are boarded and the back is a brick and all areas has been tiled....see attached pics.

New Wet Room Installation

I'm planning on removing all the tiles, board the whole shower/wet areas including the existing back brick wall with Marmox waterproof Tile backer board of thickness 12.5mm. The floor at the moment has got a 20mm place on the wooded floor.

Issues at the moment

Thinking of using the Impey Membrane products but from what they say, they dont recommend using the membrane on the wall if you will be tilling to some certain weight, think 20kg etc. Correct it sags over 20kg/m2 (total weight)

On top of the 20mm board on the floor, i'm planning on using the Marmox board maybe 6-10mm thick to cover the existing floor board, which will flush and be levelled with the shower tray/aqua dec tray.

I'm trying to get the best tanked/waterproof wet area so my questions now are:

1. Will using Marmox tile backer boards (12.5mm thick) to water proof the walls will be ok? (remember the left & right walls are boarded and the back is bricked)

You could use 12.5mm plaster board for this and tank with Dura-WP back wall being boarded over battens @450mm centres. This will cope with well over 20kg/m2

2. What is the suitable thickness of Marmox tile backer board to use ontop of the existing floor board or this is not needed?

Wouldnt bother with cement boards over ply with 10mm wbp, 1 board will do whole room no joints then use the samw WP as used for walls to tank and act as your seperation layer

3. As mentioned, Impey doesnt recommend using their Tilesafe membrane roll on walls but is this possible to use as i will be using the tilesafe on the floor areas and will also like to use it on the wall as I saw a programme on BBC cowboy traps whereby the BBC team/tiler used the tilesafe on the walls and floor.

Ye they probably had it given to them free :

Use 1 system walls no floor no lumps and bumps where tilesafe overlaps and joins no messing about with differing instructions and voiding warrantees.

Impey AD1 10m2 WP floor and wall kit £540.00 Delivered

Or the Tuff2 1300x820 former with dedicated drain and above tanking £510.00

4. What is the suitable adhesive to use in holding the tile backer boards to the walls?



Many thanks for your time reading this and any inputs will be highly appreciated.

Thanks

As Above