Advice for DIY install of bathroom and waterproofing walls - can I tile a dot and dabbed wall?

Not made much progress on this other than having the ceiling plastered and now painted. Been busy doing jobs on the rest of the house. Just put the spankers in today.

Got a tiler sorted to come too and he noted that it wasn't entirely level but would be able to sort it. He seemed very competent and recommend but pretty expensive to tile it all at 2.7k. Going to do some fancy bits like mitre the tiles in the niche too.


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Got my shower tray finally bedded in (put it on mortar but tbh it was thin

Also got lights in (2 in shower are small ones and there is 2 bigger ones above bath/sink, seems enough)

Put my shower drain in and for some reason I recall reading /seeing online to put silicone on it as you tighten the ring..... Then read after it says don't use acetoxy silicone.... Doh. I used Dow corning 785


Also got to put in the decoupling membrane (6mm marmox boards n the floor of the bathroon - after priming floor twice then prob use the 8mm trowel I have). Would you put them underneath the bath? @200sols ?

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Cool. I laid mine straight onto the floor boards first time, and it ended up cracking.

I didn't factor in that the underside of the tray wasn't flush to the ground, and one half of the tray was incredibly thin (about 3mm!). I've replaced it now and added various sized blobs (according to the depth) so the underside of the tray is supported consistently.

I used a mix of ready mix cement + extra sand + PVA. Looked very similar colour to yours.
 
Cool. I laid mine straight onto the floor boards first time, and it ended up cracking.

I didn't factor in that the underside of the tray wasn't flush to the ground, and one half of the tray was incredibly thin (about 3mm!). I've replaced it now and added various sized blobs (according to the depth) so the underside of the tray is supported consistently.

I used a mix of ready mix cement + extra sand + PVA. Looked very similar colour to yours.

Oh dear! Was it a cheap plastic tray?

This is a stone tray and to be fair not uniform underneath so can see ive weighed some areas down with tiles to ensure contact on the edge and also applied silicone.

The manufacturers (mira) suggests either silicon or mortar for this and to be fair they can be supported from stand up legs in four corners so it should(!) be fairly capable of supporting its own weight.

Doesnt seem to wobble now that I've put it in at least!
 
Nope, it was a £250 stone tray. Looks identical to yours. Also available with optional legs (riser kit).

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I snapped a few pics as I was breaking it up for disposal. One end is about an inch thick. The other side very much not - I'm not sure how that's expected to support any weight over a 800mm gap.

It was the thin end that cracked on me. Only dropped a few mm until it was at the floorboard level and the plastic never split. But I couldn't leave it like that.
 
Going to put the decoupling membrane (6mm marmox boards) on the floor this weekend. Going to primer twice then put it in.

Will be putting it in with 8mm fully combed tile adhesive then 25mm screws - I want to avoid longer screws as there are so many services under my bathroom! From reading marmox advise it seems to suggest screws aren't even necessary?

Should I put this decoupling membrane under the bath also? Suppose its extra "waterproofing"?


Thoughts @Simon @200sols
?


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Only thing I can't work out is if I need to screw the boards down after fixing them with cement based adhesive

The marmox technicalguide suggests its not necessary and even suggests its counterintuitive for some applications (floorboards/plywood). Seems to stay silent on chipboard.

Any thoughts @Simon @200sols ?


Primer on
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Boards cut to size
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