Dry Rot following renovation

[Benanna]

So we had an independent survey, problems are condensation due to the celotex stud wall void, penetrating damp due to hairline cracks sand/cement external render, and possibly a drainage issue exacerbating a wet ground floor. All the problems on the elevation that gets the weather. Internally have been recommended to remove all the stud celotex and also the original internal plaster which also appears to be a cement type render and get back to the stone wall, which I can see does have lime mortar. If money were no object then I would be stripping off the render externally and internally and going back to lime. However, the finances will currently only stretch so far, so my question is, once we have stripped down internally, treated and removed the visible rot, resolved fresh water ingress and replaced damaged timbers where necessary and then left to dry out...if I did just lime internally would that help until such time in the future we can afford to re render outside? At the moment we might just have to repair the cracked sand and cement render externally until we can afford to replace....would this approach at least be a step in the right direction amd allow the wall to at least breathe is one direction? Many thanks, oh and this is the rot in the upstairs, see attached pic ..

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Do you know at what point the house was renovated?
Could there have been a leak from that radiator which had not completely dried out?

 

[Spoondemon72]

Vents aren't going to help here, it's bad specification and workmanship. The external render is annoying but also didn't cause the issue.

The Celotex is doing it's job, it just shouldn't be butted to a non-porous surface. A lime finish is also fine but what is going to resolve the issue is removing the internal cement plaster. You could reinstate the Celotex at that point (other, arguably better, insulation options are available).


M

Some further photos of the extent of the fungus. Renovated supposedly in 2018, it has had 5 or so years of unchecked growing in all the stud voids....delightful...but we are getting all the internal cement render off, finding some old lime render. It's hard to see where it initially started but 2 key areas near ground level and the back door might be candidates...

 

[Lacan07]

Some further photos of the extent of the fungus. Renovated supposedly in 2018, it has had 5 or so years of unchecked growing in all the stud voids....delightful...but we are getting all the internal cement render off, finding some old lime render. It's hard to see where it initially started but 2 key areas near ground level and the back door might be candidates...

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Your doing a grand job there