Solid wall buildings part elebenty - alternatives to lath and ...

No, I am not proposing to get rid of any existing lath & lime plaster wall!

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So, back to the saga of my damp gable wall and chimney breast.... when the renovation team come to hack out the cement pointing and replace it with lime, I also asked if they would poke holes in the damp interior walls, remove any debris which might be causing damp bridging and then make it all nice again.

As mentioned previously, I had this wall skimmed in gypsum 12 months ago, (before I became a damp solid wall traditional building bore and realised the error of my ways). I've just spent the last few days scraping said gypsum skim coat off this wall in preparation.

What I have found is that most of the chimney breast is old L&P, but the edge of it, and the sides of the alcove abutting it are not. I assume it's some sort of gypsum plasterboard, but it's not the stuff with a paper surface.

It might help if I post a photo at this point:
by

So you can see on the LHS the problem alcove. The point above the left of the mantelpiece where the 'white' wall stops is the interface between L&P and the other stuff.
If you look at the back of the alcove there is a large stain round where the light fitting is. This has now been stripped of gypsum back to the original lime plaster. And yet creating the alcove itself, strangely is all modern board. This appears to go up as far as a wooden bead I found embedded in the wall about 6 inches below the cornice.
At this point I stopped stripping the skim coat as I figured I might as well get rid of the plasterboard, given then it doesn't breathe.

So my current plan, when the pointing and other exterior works is done and the guy starts work inside, is to suggest they rip out the plasterboard and replace it with something more sympathetic to an old building with solid walls, which is a bit more forgiving to damp.

My initial thought was replace with lath and plaster, but I suspect that will be ££££, so I wondered if there was anything else out there I should consider.
I've been reading some Historic Scotland case studies today where they used calcium silicate board as a hygroscopic, capillary, vapour permeable insulator, but it was basically plastered on the hard (directly onto the stone wall) as insulation with lime plaster affixed to a mesh on top of it.
Given that the problem wall gets a fair bit of prevailing wind and rain i'm not sure that the moisture would go from the inside to the out rather than the other way around!

If you've made it this far, thanks for reading 
My plan is to paint this wall with claypaint so it's nice and breathable, BTW.

So, any old building owners used alternatives to L&P? I tried Googling but it's mostly people getting rid of L&P, not the other way around

So, back to the saga of my damp gable wall and chimney breast.... when the renovation team come to hack out the cement pointing and replace it with lime, I also asked if they would poke holes in the damp interior walls, remove any debris which might be causing damp bridging and then make it all nice again.As mentioned previously, I had this wall skimmed in gypsum 12 months ago, (before I became a damp solid wall traditional building bore and realised the error of my ways). I've just spent the last few days scraping said gypsum skim coat off this wall in preparation.What I have found is that most of the chimney breast is old L&P, but the edge of it, and the sides of the alcove abutting it are not. I assume it's some sort of gypsum plasterboard, but it's not the stuff with a paper surface.It might help if I post a photo at this point: 2015-12-30_04-52-13 by The Pingus , on FlickrSo you can see on the LHS the problem alcove. The point above the left of the mantelpiece where the 'white' wall stops is the interface between L&P and the other stuff.If you look at the back of the alcove there is a large stain round where the light fitting is. This has now been stripped of gypsum back to the original lime plaster. And yet creating the alcove itself, strangely is all modern board. This appears to go up as far as a wooden bead I found embedded in the wall about 6 inches below the cornice.At this point I stopped stripping the skim coat as I figured I might as well get rid of the plasterboard, given then it doesn't breathe.So my current plan, when the pointing and other exterior works is done and the guy starts work inside, is to suggest they rip out the plasterboard and replace it with something more sympathetic to an old building with solid walls, which is a bit more forgiving to damp.My initial thought was replace with lath and plaster, but I suspect that will be ££££, so I wondered if there was anything else out there I should consider.I've been reading some Historic Scotland case studies today where they used calcium silicate board as a hygroscopic, capillary, vapour permeable insulator, but it was basically plastered on the hard (directly onto the stone wall) as insulation with lime plaster affixed to a mesh on top of it.Given that the problem wall gets a fair bit of prevailing wind and rain i'm not sure that the moisture would go from the inside to the out rather than the other way around!If you've made it this far, thanks for readingMy plan is to paint this wall with claypaint so it's nice and breathable, BTW.So, any old building owners used alternatives to L&P? I tried Googling but it's mostly people getting rid of L&P, not the other way around

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