23 Oct 2019
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Hi all,
My house dates back to about 1885.
Mid terraced, redbrick, lime pointing and plastered inside with lime plaster.
When carrying out some renovations I noticed a lot of blown plaster on the internal face of an external upstairs wall. I think that at some stage previous owners had used a modern plaster over the old lime plaster, perhaps to tidy up or even out the surface. This combined with a bit of ingress (through a now fixed gutter, and a gap in exterior pointing) allowed moisture build up and prevented the wall from breathing. In the end I had to hack out all the blown plaster from the internal face and found that, for the most part, large chunks came away around the wall. Due to this I hacked it all off right back to brick. I intend to install a vent in wall, clean the brickwork, and as I can’t afford to have it lime rendered, I want to batten it, and put up plasterboard Which I would like to insulate. Can anyone advise me on the best type of natural and breathable insulation to use ?
I’ve seen a lot of people putting on synthetic insulation that surely can’t be breathable on walls exactly like mine , and also a lot of people not even creating a cavity , like the battening would do. They’re dotting and dabbing directly onto solid wall with non breathable materials, or insulating inside the gap with same. I’ve been given a lot of conflicting advice on this and I’m wondering if anyone can steer me right.
The wall is built with two rows of brick, either an English or a header bond and lime pointed.
Thanks for reading
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Simplest answer is insulated plasterboard I would think, mind you that will not breath in fact I doubt standard plasterboard will either.

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