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Ok, thanks. I think I might go with that. My understanding is the foil on those sheets acts as a vapour barrier if they're taped up and facing inside, and the 25mm stuff will be an acceptable cost, there's quite a few skips around here at the minute as well, so might be able to find usable offcuts or second hand stuff.
Just to continue with the overkill, I like the idea of humidity control. I use a thermostat meant for terrariums (to keep lizards and snakes in a given temperature range) to turn my radiator on / off. I think it might have humidity control on it as well so might investigate that too.
christianSpaceman
stevo_com
I've only got 25mm Celotex insulating my shed and combined with a couple of thermostatically controlled tubular greenhouse heaters, it's kept my chisels dry for the past 10+ years
Adequate ventilation is provided by my half-arsed external cladding installation...