Bathroom waterproof membrane question

[MassiveJim]

Just thinking of a future project and would like to call on other peoples knowledge

Our en suite has a freestanding bath that will need replacing and the tiles under it will also need replacing, however I am planning on keeping the tiles on the wall.
The mrs has a habit of spilling loads of water on the floor though, sometimes she remembers to put a towel down but not always

My question is, is there any point putting a waterproof membrane on the floor without creating a "lip" that would normally go up the wall before fitting tiles ?

Is there any other option to help with the situation ?
There is a stain on the ceiling below right around the bath area.

 

[Mason-]

So guessing it's going under the bath panel and on to unprotected/untiled floor under the bath?
Yeah you'd have to make some water proof lip the other side of the bath panel.

But really... just have a floor towel/bath mat? Even with some lip under the bath panel, the water likely won't dry out well under there and you'll end up with mould.

Sorry just realised it's a freestanding bath. Yeah tricky, you'd really need to tank the floor and where the floor meets the walls, but to do that you'll need to take the tiles off. How much water is your wife spilling on the floor for it to go under a freestanding bath and reach the walls . Bath mat/towel is required here.

 

[MassiveJim]

its a fully tiled floor and a flat bottomed freestanding bath, as far as I can tell the bath is siliconed to the floor but there is some movement
I think the bath has been in around 20 years,

as far as the water, its just overspill from moving around in the bath, and sometimes quite a lot of water spills out then just sits on the tiled floor until she gets out and mops it up.


EDIT found a picture of the bathroom on rightmove from before we moved in

 

[DJMK4]

Is membrane same as waterproof underlay?


Im currently looking for waterproof underfloor (underlay) approx 2mm - this will go underneath the LVT (luxary click flooring planks)

 

[200sols]

Do it properly and remove that step.

 

[Mason-]

its a fully tiled floor and a flat bottomed freestanding bath, as far as I can tell the bath is siliconed to the floor but there is some movement
I think the bath has been in around 20 years,

as far as the water, its just overspill from moving around in the bath, and sometimes quite a lot of water spills out then just sits on the tiled floor until she gets out and mops it up.


EDIT found a picture of the bathroom on rightmove from before we moved in

Where the waste pipe comes through the floor, it could be that water is dropping through around that. It'd be obvious if you lifted the bath out. Not much you can do unless you lift the bath out, create some sort of barrier around the waste pipe and seal it with epoxy/silicone.

Similarly could be where the mixer taps come up through the floor.

 

[MassiveJim]

I'm not concerned about the stain on the ceiling, it hasn't got any bigger in the last 4 weeks, I just want to try and prevent the future floor from getting water damaged (currently that step is chipboard with tiles directly on top of it.

Do it properly and remove that step.

We'll keep the step, mainly because we actually like it, but also means I won't need to retile the entire bathroom in doing so.


I've already retiles the floor in the lower part of the room but I broke quite a few wall tiles removing the old floor, so I'm going to have to be super careful on the step because I've used up most of the spare wall tiles

 

[Thekwango]

as far as the water, its just overspill from moving around in the bath, and sometimes quite a lot of water spills out then just sits on the tiled floor until she gets out and mops it up.

tell your missus to stop over filling the bath and then sloshing about in it like a child - overspill problem resolved.

 

[MassiveJim]

it's not like its a major life changing problem, but I'm thinking ahead, when I relay the part of the floor with the bath on it, it would make sense to add some additional level of water protection as a precaution

 

[200sols]

it's not like its a major life changing problem, but I'm thinking ahead, when I relay the part of the floor with the bath on it, it would make sense to add some additional level of water protection as a precaution

Overboard the existing floor with tile.backers like marmox, these are fully waterproof. Use a product like marmox multi bond or just silicone when laying them on the joints and finish with the waterproof tape. You now have a fully waterproof floor.

If existing subfloor is wet or is water damaged then replace with some ply before overboarding with the marmox.

 

[Mason-]

Overboard the existing floor with tile.backers like marmox, these are fully waterproof. Use a product like marmox multi bond or just silicone when laying them on the joints and finish with the waterproof tape. You now have a fully waterproof floor.

If existing subfloor is wet or is water damaged then replace with some ply before overboarding with the marmox.

Doesn't matter if they're made of the most water impervious material on earth if water is getting through where the supply and waste pipes come through the floor. Make sure they're sealed, and then as well when the bath is put down, put a fat perimeter of silicone under the tub too.

 

[MassiveJim]

Doesn't matter if they're made of the most water impervious material on earth if water is getting through where the supply and waste pipes come through the floor. Make sure they're sealed, and then as well when the bath is put down, put a fat perimeter of silicone under the tub too.

Overboard the existing floor with tile.backers like marmox, these are fully waterproof. Use a product like marmox multi bond or just silicone when laying them on the joints and finish with the waterproof tape. You now have a fully waterproof floor.

If existing subfloor is wet or is water damaged then replace with some ply before overboarding with the marmox.

When the time comes, the toilet and bath will be replaced along with the floor mounted taps.
the existing floor (step) doesn't feel particularly secure so I fully expect to have to remove not only the floor but the timbers it is rested on as well and possibly the floorboards that they are rested on.
Most work carried out for the original owners of this house is a bit crap so I'm having to correct it as I work in each room.

 

[b0rn2sk8]

The water is almost certainly going though the penetrations in the floor where the waste and water pipes come though.

No amount of tanking will work unless you close these holes off. You can get specific membranes designed for these holes as part of normal tanking kits.

As for your partner, tell her to put less water in the bath and they’ll be no issues with spillages. If this is happening a lot, you could well have a very mouldy/rotten sub floor and potentially joists.