I took out the cladding and failed render from under my stairs a few weeks back, today I got given a load of C24 timber, so want to build it back insulated. Single skin brick to exterior, I'm guessing my best bet is to keep it 'breathable' with 100mm of rockwool or similar rather than PIR foam? I'll be having a go at constructing storage in front of that so well ensure it has some cross ventilation at that point but at the same time don't want to lose too much depth I suppose.
Edit: actually just about to put a load of non-period correct cement render on the outside so worrying about breathability is probably a non-issue.
I took out the cladding and failed render from under my stairs a few weeks back, today I got given a load of C24 timber, so want to build it back insulated. Single skin brick to exterior, I'm guessing my best bet is to keep it 'breathable' with 100mm of rockwool or similar rather than PIR foam? I'll be having a go at constructing storage in front of that so well ensure it has some cross ventilation at that point but at the same time don't want to lose too much depth I suppose.
Edit: actually just about to put a load of non-period correct cement render on the outside so worrying about breathability is probably a non-issue.
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