Tanking wall beside bath

[Mossop]

I was just wondering which of the many options you would use when putting up new board on the wall which runs the length of a bath with an overhead shower above the bath?

That is, a wall currently with nothing attached to the stud.

Options appear to be putting up ordinary plasterboard, or plywood, or Hardibacker or AquaPanel or some other cement-based board.

Tanking: do you use the paint-on tanking products or do you use an overlap matting system?

I'd be interested in hearing which method you would use, and if you have any particular reasons as to why you'd choose that substrate and tanking or matting finish?

Thanks.

 

[Qwerty]

I use all different types of tanking but will choose the type that best suits the circumstances....... size of area to be tanked, substrate, weight of tiles, type of tiles, occasional or regular shower use etc etc.

For your situation I would advise you use standard square edge plasterboard and a liquid tanking product as it is the quickest, easiest and cheapest method. It will be adequate for your situation (depending on tile choice of course!)

 

[Albert]

As above🙂

 

[Rookery]

As above

 

[Mossop]

I do have some tapered edge sound reducing plasterboard. I suppose it's better to have square edge plasterboard, rather than cut off the tapered edge?

I have spoken with a bathroom installer on the 'phone and he did say he usually uses plywood on the wall, then tanks this.

If I was getting this installer, do you think it's better just to let him go with what he is used to using rather than insist on using plasterboard? In other words, is there any negative in using tanked plywood over tanked plasterboard?

 

[Flintstone]

Plywood has no place in a wet area, tanked or not. There is no benifit to it but lots of negatives!

 

[Qwerty]

Use plasterboard (or forever hold your peace!)

 

[Bond]

I do have some tapered edge sound reducing plasterboard. I suppose it's better to have square edge plasterboard, rather than cut off the tapered edge?

I have spoken with a bathroom installer on the 'phone and he did say he usually uses plywood on the wall, then tanks this.

If I was getting this installer, do you think it's better just to let him go with what he is used to using rather than insist on using plasterboard? In other words, is there any negative in using tanked plywood over tanked plasterboard?

No need to cut off the tapered edge, butt together and tape and fill flush with board.

 

[Mossop]

Plywood has no place in a wet area, tanked or not. There is no benifit to it but lots of negatives!

What about on the area of wall where a hand shower is mounted?

A bathroom installer I was speaking with said he often tanks plasterboard, though on the area where there is a wall-mounted hand shower he said plywood is good as after many months/years of placing/removing a hand shower on the wall this may have a negative impact on the underlying plasterboard. This should not be an issue with plywood.

What do you think?

 

[Flintstone]

Wood is often ok if it’s behind a waterproof surface

 

[Mossop]

Plywood has no place in a wet area, tanked or not.

Does the statement above contradict the statement below? Or by "wood" (below) perhaps you mean wood other than ply? If you could clarify, it would be appreciated. Thanks.

Wood is often ok if it’s behind a waterproof surface

 

[Qwerty]

Does the statement above contradict the statement below? Or by "wood" (below) perhaps you mean wood other than ply? If you could clarify, it would be appreciated. Thanks.

Yes, not worded well but I know what he means. Wood is far more susceptible to thermal movement, swelling etc. It is best avoided in a wet area as there are far superior products out there. Waterproof, structural tanking boards are available which will be more suitable.

 

[Flintstone]

Sorry, what I meant was if he wants to install some wood to the stud work before over boarding so there is a secure fixing in there for things to screw to that’s ok.

 

[Mossop]

Waterproof, structural tanking boards are available which will be more suitable.

Do you mean, for example, hardiboard?

 

[Qwerty]

Do you mean, for example, hardiboard?

Aquapanel, Hardibacker & no more ply are water resistant but not waterproof.
A structural waterproof tanking board such as wedi, schluter, marmox, orbry, jackoboard are the better choice.

Is the shower backing onto a stud wall or airing cupboard?

 

[Mossop]

Below is a plan of the bathroom, showing the locations of the bath, and one overhead shower and one wall-mounted dis-mountable hand-shower.

As I've indicated on the figure, there is a brick wall at one end, the side wall is a stud wall which will be plasterboarded and tanked.

What about the short wall on which a hand shower is mounted (this open alcove runs floor to ceiling)? Do you suggest?

a) Tanked plywood sheet
b) Tanked Hardiboard sheet
c) Tanked plasterboard sheet, with a timber frame directly behind the hand shower
d) Other

 

[Mossop]

Is the shower backing onto a stud wall or airing cupboard?

I just saw your post after I posted the above. It's backing onto a stud wall (on the landing - top of the stairs).

A structural waterproof tanking board such as wedi, schluter, marmox, orbry, jackoboard are the better choice.

By "structural", do you mean these boards have some inherent strength to them (unlike plasterboard) so objects such as hand showers can be attached to them

 

[Qwerty]

Yes, but to fix items to the wall you will still be better off with some structural support. You are fortunate that it's a stud wall. You can always use CLS timber inside the stud wall to provide the support you require. You will be absolutely fine using tanked plasterboard with timber supports inside the stud wall.

In short, C 😀

 

[Mossop]

What's CLS? Edit: It appears to be Canadian Lumber Standard.

I found out that it is possoble to purchase Schluter Kerdi-Board locally. In case that was used, I suppose the 9mm thickness is the one to go for to adhere tiles then a hand shower to? Do you think this would still require some structural support (i.e. timber frame)?

 

[Qwerty]

I would still opt for timber support.

Yes, CLS does stand for Canadian Lumber Standard (carcassing timber) .... everyday is a school day on here! 🙂

 

[Bond]

You could fix ply to studs overboard with plasterboard, then tank. Good for fixings and adds rigidity to the wall.

 

[Mossop]

You could fix ply to studs overboard with plasterboard, then tank. Good for fixings and adds rigidity to the wall.

That's interesting. I do have some sound resistant plasterboard.
Do you guys think securing plywood directly to the studs, then securing this plasterboard on top, then tanking the plasterboard would most likely eliminate any risk of thermal movement or swelling of the plywood?

That is, only on the angled wall shown on my above diagram which has a red arrow pointing to it.

If there's a full ply wall here, it does leave open the option of securing other things to it e.g. a shelf/shelves or a basket for toiletries etc.

 

[Bond]

If you screw ply and plasterboard to the studs and follow instructions on the tanking kit, there should be no foreseeable issues at all.

 

[Qwerty]

Would the build up of the layers cause an issue with door frame, architrave etc?

 

[Mossop]

Would the build up of the layers cause an issue with door frame, architrave etc?

There is no architrave, and this would only apply to the angled wall indicated on my above diagram with a red arrow. There is no door on that wall so there would not be any issues with regards to a door frame either.

 

[Mod]

I was just wondering which of the many options you would use when putting up new board on the wall which runs the length of a bath with an overhead shower above the bath?

That is, a wall currently with nothing attached to the stud.

Options appear to be putting up ordinary plasterboard, or plywood, or Hardibacker or AquaPanel or some other cement-based board.

Tanking: do you use the paint-on tanking products or do you use an overlap matting system?

I'd be interested in hearing which method you would use, and if you have any particular reasons as to why you'd choose that substrate and tanking or matting finish?

Thanks.

I allways use aquapanel or similar if theres a shower and its a stud wall