My house is 1930's with cavity walls and I'm renewing my first-floor bathroom. I’ve removed the old tiles (and most of the old plaster) from one exterior wall which is to be fully tiled and will include an area of a new shower. My options seem to be:
a) Have it re-plastered, (I can’t do that myself) but I’m told it will take ages to dry before it can be tiled.
b) Dot and dab, but I’ve never done this and this is quite a large wall for a first attempt.
c) Fix batons to wall and mount 12.5mm plaster board and Aquapanel where required.
I’ve pretty much decided that option c is the only one open to me, so I’m left with a few questions:
1. Should I start with a sheet of polythene?
2. Should I put insulation between the batons? (I’ve seen some interesting looking panels in Wickes that are 25mm thick fibre with foil each side).
3. Can I tile straight on top of the panels (plasterboard and Aquapanel) when done?
Downstairs definitely has two skins of very solid brick and a gap of about 30mm (that's an estimate from memory). Upstairs, where I'm doing the bathroom work, when I removed the WC at the weekend and looked at the hole left by the soil pipe, I got the impression there were two rows of brick, but no gap, although at the time I thought it was just a case of mortar blocking the gap. I suppose I should have measured it but too late now as I've filled the hole.
So now I'm wondering, would you expect a solid 9in wall upstairs?
I'd expect all the external walls to be solid 9". If you are going to be successful I think your only option will be to have the walls replastered. I would suggest a coat of lightweight browning plaster with a finish coat.
You could go down the boarding route but damp will form behind the boards causing you all sorts of problems.
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