We have an 1890's victorian bungalow and are about to replace a failed back-boiler with a combi, this'll leave a fireplace to be closed up and an empty space where the immersion tank currently juts out - since most of the wall will need replacing I'm thinking of stripping the wall and properly insulating it.
Looks like part of the wall has been worked on already, so it's only part lathe and plaster, the rest actually sounds like plaster skimmed over wood when you knock it! We'll see. Still, it'll be messy, but we're tired of being cold.
From going up in the loft and looking down the walls it looks like they're constructed like so:
thick stone wall
2-3cm air cavity
1 inch square wood studs attached to floor and ceiling joists
lathe and plaster across the studs
Having read around these forums and elsewhere I'm thinking we can use something like Celotex 25mm TB3025 between these studs, and 27mm Gyproc Thermaline plus insulated plasterboard over the top (since the latter will be about the same thinkness as lathe and plaster there'll be no great change in the dimensions of the room).
Which leads to some questions:
1. Does this sound reasonable?
2. The existing studs are very randomly spaced (10inch, 13inch for the two I measured) which will mean a lot of cutting of celotex, plus studs not lining up with edge of plasterboard. Would it be wiser to replace the studwork? And what with?
3. Speaking of studs - these 1inch studs seem wayyyy to small for the 305cm high walls, are they actually likely to be fixed to the wall somewhere (and thus a cold bridge!)? Or does the lathe help to make the wall rigid enough?
Thanks in advance. :D