Bathroom refit - plasterboard and tanking question

sgoode

I am refitting my bathroom. I have pulled off the old tiles and on the outside wall around the window the plaster has fallen off and is down to brick on the whole wall. It is the original 1930s plaster but the other 3 walls are ok bar a couple of patches.

A plasterer came in tonight and suggested fixing moisture resistant plasterboard up rather than fully replastering. I know that plasterboard doesn't need to be skimmed before tiling but some of this plasterboard will be in the shower area (shower over bath). I have read many conflicting forum posts about whether I can tile directly over the board in the shower area or whether it needs tanking first. Also after reading many forum posts I am still not entirely sure what the tanking process is - is it just something I paint on?

On a similar note I am going to pull up the floorboards and fit WBP plywood down for tiling on. Would this also need to be tanked or prepped in anyway or can I just tile on top of it?

I have done a complete bathroom refit before, but the plaster was sound.

I can keep this thread updated with my progress if anyone is interested. I am always interested to see other people's efforts.

Many thanks.

diable

If its an outside wall it could be prone to getting cold so the tiles will feel cold and you may get condensation. When I had my bathroom done I installed the plasterboard with the think polystyrene backing on it.

In the shower area I would install something like aqua panel or similar.

sgoode

Thanks. Would the plasterboard/tiles be any worse for cold/condensation that the original tiles on conventional plaster?

Can aquapanel be dot/dabbed to the wall or does it have to use a studded framework as is heavier than plasterboard?

diable

My tiles seem "warmer" as they are on the insulated backed plasterboard.

One thing I forgot to ask though how old is the house as mine is a 1900's Edwardian house so has no cavity wall so the cold will filter through.

My bathroom reno thread.......

https://forums.moneysavingexpert.com/discussion/3057402

sgoode

Cheers. I saw your thread before and read it with interest - impressive stuff!

House is 1930s so has cavity walls and cavity insulation.

keystone

sgoode wrote: »

I am refitting my bathroom. I have pulled off the old tiles and on the outside wall around the window the plaster has fallen off and is down to brick on the whole wall. It is the original 1930s plaster but the other 3 walls are ok bar a couple of patches.

A plasterer came in tonight and suggested fixing moisture resistant plasterboard up rather than fully replastering. I know that plasterboard doesn't need to be skimmed before tiling but some of this plasterboard will be in the shower area (shower over bath). I have read many conflicting forum posts about whether I can tile directly over the board in the shower area or whether it needs tanking first. Also after reading many forum posts I am still not entirely sure what the tanking process is - is it just something I paint on?

On a similar note I am going to pull up the floorboards and fit WBP plywood down for tiling on. Would this also need to be tanked or prepped in anyway or can I just tile on top of it?

I have done a complete bathroom refit before, but the plaster was sound.

I can keep this thread updated with my progress if anyone is interested. I am always interested to see other people's efforts.

Many thanks.

Whether its plasterboard or aquapanel you still have to do some waterproofing for the joins. Frankly its easiest just to tank the whole area around the shower up to about 1½m above where the feet are stood when showering. If you have an insulated cavity wall then just D&D plasterboard (grey or green doesn't really matter) and don't forget to prime. Use APD or Primer G - under no circumstances use PVA. Same goes for your WPB. Use 25mm if direct onto joists and make sure avery single bit of edge is supported - put in extra noggins if needed.

Cheers

keystone

Sorry - missed a question. The easiest tanking systems if you've not done one before are either the BAL WP1 one or the Dunlop equivalent.

Cheers

sgoode

Thanks again.

RE the tanking kits - half of the shower area will be the new plasterboard or aquapanel and the other wall will be the original plastered wall (this one hasn't fallen down). Do I just need to tank the new boarded section, or the whole area? And will the tape in the kit to seal the edges affix correctly to the original plaster wall?

keystone

sgoode wrote: »

Thanks again.

RE the tanking kits - half of the shower area will be the new plasterboard or aquapanel and the other wall will be the original plastered wall (this one hasn't fallen down). Do I just need to tank the new boarded section, or the whole area? And will the tape in the kit to seal the edges affix correctly to the original plaster wall?

Personally I don't see the need for using aquapanel being that much more expensive than plasterboard if you are tanking it. yes it will work on the original plaster but if half of it has come down I'd be pulling the rest too just in case it decides to part company with whatever its attached to at some stage in the future. Yes do the whole area. Yes the tape will seal because it becomes impregnated with the tanking compund. Don't forget to tape the edges of the bath/shower tray too. "How To" Videos are available on Utube but the kits instructions are pretty explicit.

Cheers

sgoode

Here's a few before and in progress shots if anyone is interested. It is quite fun stripping everything out. The bathroom is still in use by a household of 5, so I need to keep everything up and running for as long as possible.


Tiles and wallpaper removed:

Starting to hack off the dodgy plaster:

sgoode

An update:

Well and truly stripped out:


I went for the green plasterboard in the end and used a tanking kit in the shower area:


Ready for tiling:


Tiling under way: