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As much as you can cram in.
Don't actually cram it, needs to be nice and puffy, but yeah, 300mm much better. It's cheap so might as well go all in while you're doing the work anyway
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depends on how much head height you have and how much you can afford to lose. We used the 175 ones because the existing joists gave us about 200mm of space and 375 total was enough. There is a point where extra insulation gives diminishing returns and you should be aware about not blocking off the eaves.
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As stated already, the short ones are for restricted head room. Currently regs is 270mm loft insulation I think so 300mm gives you space for that + decent air gap.
The boards might not like being walked on unless you have joists above the legs too. I just used the loft zone stuff which includes lightweight metal joists for not a massive price (their boards are a rip-off though)
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dbr
Sumo
Polygon
@small
Loft legs. Any reason why I should use the 175mm instead of the 300mm legs?
Loft is boarded, but straight onto joists, then previous owners had a company in who just threw insulation on top of boards. The plan is to lift boards and reinstall insulation (buying more), with legs and then board, creating usable storage.
Surely more insulation = better.
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