help required

[charlie1]

I have a 2m x 4m bathroom. There is going to be a wetroom former at one end. I also want electric underfloor heating installed. The subfloor is a suspended timber floor boards. Whats the best way to go about this, I advised tanking the shower area, and reinforce floor, adding noggins and replacing floor boards with 25mm ply then over laying 6mm cemment board, then heat mat then slc then tile?? Not usually something i deal with and want to ensure the correct prep is done as i have serious doubts about the builder who is project managing, he says i wont need to envelope the tiles in the former as its an "novolinni". We all know tiles dont bend so need to see exactly what he is talking about?? anyone heard of this? I will be tiling with polished porc tile. Does my prep sound ok?

 

[Gazzer]

linear drain ?

 

[Gazzer]

[video=youtube;gfSJ76W-IDI]http://www.youtube.com/watch?v=gfSJ76W-IDI[/video]

 

[Mike]

the prep sounds ok but make sure the cement boards are laid with adhesive and screwed. be careful with the polished porcelain as they'll be very slippy when wet

 

[charlie1]

yah sir ramic linear.... that link no work mate :-(

 

[Mike]

yah sir ramic linear.... that link no work mate :-(

it's a youtube vid. works ok on mine

 

[Gazzer]

Works fine here too,
Not sure about the 4mm ply though :mad2:

 

[suave]

working here

 

[charlie1]

must be needing an upgrade!! so, i would think you would still need to envelope the tiles??

 

[Gazzer]

must be needing an upgrade!! so, i would think you would still need to envelope the tiles??

No envelope needed

 

[Mike]

i'm not familiar with that tray and it's hard to tell on the video

 

[Mike]

No envelope needed

what do you do about the little step directly above the v? you can see it when the ply's being laid at about 4mins 10 secs of the video

 

[Gazzer]

what do you do about the little step directly above the v? you can see it when the ply's being laid at about 4mins 10 secs of the video

Watch the 2nd part especially 3mins.45 seconds in.
[video=youtube;GbwO2-iV2qE]http://www.youtube.com/watch?v=GbwO2-iV2qE&feature=player_embedded[/video]

 

[Mike]

i see now neale, cheers

 

[Gall.B]

Id be wanting to put a decoupler on top of the SLC, just my prefrence.

 

[charlie1]

sorry but i dont understand how this works, is there no slope towards the drain? I would assume there is, and therfore would need to be enveloping?

 

[Gazzer]

Yes slope built into former.

 

[charlie1]

Yes slope built into former.

So then the tiles should be sloped aswel, wen the water lands on the tiles it should be sloped to the drain?,,...(me = confused)

 

[Gazzer]

Can you still not see the videos ? Its as simple as it gets.

 

[charlie1]

yeah, working now, i will watch again!

 

[Gazzer]

You need to see the 2nd video for the tiling part.

 

[Smudger]

AFter ply, as long as there is no movement and all joints are supported, I always tank with dura wp overlapping tray by 100mm and up base of wall. Then lay ufh on mebrane and tile. If the ply is solid then I don't think the 6mm board is necessary. I also seal all edges and underneath of ply prior to fixing in case of residual moisture later (many plumber now use speedfit running under the floor and the have a habit of failing). Not had any problems so far.

Oh, and don't forget to check the levels of floor, ideally everything running slightly to shower, definitely no fall to walls or corners.

 

[Rich]

As above, the floor prep sounds good. I would also have the underside and edges of the ply sealed sealed and tanking the floor would be a must. I also have to agree with Mike, these do not sound like a good choice of tile for the installation. Maybe raise that with the customer/builder?