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Trying to picture the setup here, but my very unexperienced view would be not to insulate anything other than the "walls" or sides of the the converted room which is sounds like has been done. If you're just storing boxes you don't particularly need to keep it warm and if everywhere else is insulated enough the cold roof space should not transfer cold air into the warm roof space. If you can see daylight through things thats not ideal so plug that up with something.
I have a similar-ish ish situation where we have rooms in the loft and on getting advice from insulation companies they have said not to insulate the roof space unless being used. So I am better insulating the sides/above of the rooms that sit in the loft and adding insulation between joist below to keep the warm air downstairs.
Now, all that may be nonsense but that was my plan and would be my approach.
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andos
Loft insulation...
Recently had a loft conversion done. Eaves made available for storage, and there's building-regs-compliant insulation between the eaves wall and the loft room, but they left us the eaves to insulate. I've laid down standard insulation (and some boards for a storage space) and put a couple of sheets of perspex over a single-glazed window, but wondering about the best way to insulate the external wall?
For a start there are clear holes where you can see daylight, which I thought I could just plug with some foam? And are there any easy DIY solutions for boarding over the brickwork or should I just make do with plugging the gaps?