Shower from hell

[gixer]

Hi all newbie here so take it easy on me :smilewinkgrin:

Ok so just ripped out an existing shower , it had recentlystarted leaking through to downstairs . Originally done by a " proper " tiler , so thought to myself , with the right advice , i think i could do a better job myself .
This is were you guys come in
I will try and stage my questions as work progresses rather than bombard everyone with 101 questions right at the start .
So to start the floor needs re-tiled , slight bit of water damage on existing chipboard floor .
Am i better to lift and replace whole floor with WBP ply and treat the ply with Bal bond SBR ?

I have attached a couple of pics which i hope will help

Many thanks Gixer

 

[White Room]

I would and add some extra nogging just for some extra stability...

The plasterboard should replaced as well, looking at the damage the water caused..as it's in the shower could use hardie backer boards.

 

[Ian]

Replace the floor with 18mm ply and, as above, add some extra noggins to the joists while you've got the floor up. Over board the ply with 6mm cement board (stuck and screwed) and also as above use hardie boards to replace the damaged plasterboard, use a 12mm one on the walls though. Welcome along to the forum.

 

[gixer]

Many thanks for the informative replies guys , whilst waiting for my first post to activate i went ahead and started to lift a small portion of the floor to aid the drying out process As you can see the old shower made quite a mess .

So to recap next step lift entire floor (as chipboard should probably never been used in a shower room in the first place) replace with 18mm wbp ply , treat underside and edges with Bal bond sbr , then some 6mm hardieback board stuck on top of the ply with tile adhesive and screwed .....
Now i have exposed the joists do i still need extra noggins ???

Thanks again Gixer

 

[White Room]

I would, it will stop any twisting in the joists...you have a very dark area at the end of a joist, have you checked it out..

 

[gixer]

I,m no expert Whitebeam , but it appears to be sound ie not rotten , but i agree the black on it is unsightly

 

[gixer]

Ok guys , so i have my new ply screwed down and primed underside and edges .
Do i need to apply SBR primer to topside of ply before putting my cement board down ?
Problem no 2 is the cement board , when i asked local builder merchants they hadnt heard of it or didnt stock it .I did manage to find one that got some in for me but i,m concerned it may not be the right stuff , it is white in colour and looks more an asbestos replacement board . One side is shiny and one side has a bit of texture , it is called resistant multi pro , and the merchant said it is water proof .
Your thoughts very much appreciated .

Regards Gixer

 

[Gazzer]

No to priming the board face.
Not sure on the boards you have , never heard of Multi Pro. A quick google gave me a site to look at, do you have the Moist-Sure Multi Pro boards ?

 

[gixer]

Thanks Sir Ramic ,
I just googled it myself , appears to be a local firm manufacturing these so i will give them a call in the morning , but i fear i have not the right boards as their site lists board sizes of the Moistsure as 1200x1200 or 1200x800mm and mine are 2400x1200. Thankfully i have not started to put them down yet .

Regards Gixer

 

[stoner]

Hi there,

google 'no more ply'. It's around £8 per .72m2 board. I rarely use the stuff as i prefer to stick with backer boards.

 

[White Room]

Then you have the price of the glue as well..

 

[gixer]

Quick update on my wee project ... phoned cement board manufacturer who said the board i have is the same as their Moist-sure board only they cut it into smaller sizes for convenience .
So proceeded with putting my boards down.. View attachment 31363 View attachment 31364 So tomorrows project is to fit 12mm cement board to the one stud wall .
On the other solid wall should i be stripping off the existing render even though i propose to tank both these walls ?

Other question is when fitting the shower tray ( which i presume needs done prior to tiling the floor ) is there a better way to raise the shower tray other than wooden studs ?


Thanks in advance Gixer
So View attachment 31365

 

[White Room]

Is the other wall sand/cement or a gypsum undercoat and finish..the term render can be used loosely for different finishes.

 

[gixer]

Hi whitebeam , its sand/cement with finish . The bottom 300mm of finish doesnt look in the best of shape .

 

[gixer]

Hi whitebeam , its sand/cement with finish . The bottom 300mm of finish doesnt look in the best of shape .<BR>