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gaps between the joists stuffed with some horrible fibre-glass/candyfloss stuff
This appears to be the insulation that is doing the job of keeping the heat in your house from getting in to the cold roof space, but it's probably crap. I'd suggest investigating if it works at all, and if not, replacing it with something that does.
If you aren't using the roof space for anything temperature sensitive then I'd leave insulating between the roof joists, because you might fuck them.
Howard
Useful thread!
I had a follow on question from the news thread chat that was too OT to post in there:
I live in a 1960's terrace house which gets very cold in winter. I already have works underway to sort the rear wall & the floors (unrelated to heat), but as heat rises I guess the loft/roof would be most useful to improve.
Current materials in place above the upstairs rooms are; thin plaster ceiling > wooden joists > gaps between the joists stuffed with some horrible fibre-glass/candyfloss stuff > wooden floorboards on floor of loft > empty loft space > wooden joists holding up roof tiles, tiles are lined with what feels like sheeting that has gone hard though has load of holes in it so you can see outside through the small gaps under the tiles. Loft is freezing in winter & roasting in summer.
What would be the best DIY work to do to insulate the top of the house do we think please?
I was thinking of buying insulating foam boards to put between the roof joists then maybe stapling on some form of lining over the top to stop the draft but is that just going to make everything in the loft go mouldy?