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And are there any easy DIY solutions for boarding over the brickwork or should I just make do with plugging the gaps?
It's a sliding scale of effort, cost and benefit.
Right at the bottom Imo is grabbing a load of that foil insulation stuff for sheds. It'd block the holes, just needs scissors and something to stick it down. It will also fit in your boot/under your arm vs massive sheets of something.
The next step up would be foam the holes, batons for an air gap, then glue insulated boards of some kind to the batons and foil tape to finish.
Tbh it might be worth adding batons even if you just do the foil as right now it's clear and empty so you'll never have a chance like this. Even with a hand saw and combi drill it shouldn't take too long to put a few vertical batons up.
Imo the main effort of that job will be getting everything you need up there through your house and whatever access into the loft. So minimising that is the best way to reduce the effort.
https://amzn.eu/d/6JHCkuc
(the link is just to explain what I mean there's probably better value stuff)
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hugo7
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?