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Curious too.
In particular whether you need some sort of vapour barrier. Or if you should have. Especially in a shed type environment. Or is a shed leaky enough for it not to matter. Or should you install an air vent?
hugo7-
I went without a vapour barrier in my shed as it's not heated. Heating it would mean it counts as a liveable room and therefore need planning permission where I am.
My construction is: outside - tongue and groove - 20mm air gap - 60mm mineral wool - 15mm OSB - inside.
The structure should be vented for sure, whether or not your shed is leaky enough on it's own is hard to determine. I have a double glazed window and door, so I left an airgap at the top of my walls which I hope is enough. If it's not, I'll core out a hole for a proper vent.
chiroshi
is this stuff really as good as 45mm foam insulation
https://www.toolstation.com/thermawrap-self-adhesive-shed-insulation/p69456
and can you lay it under plasterboard or does it rely on the reflective qualities to work?
It's only for a shed so doesnt need to be incredible, but should I just bite the bullet and get 25mm Ikotherm boards to go under plasterboard?