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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...
BareNecessities-
Adequate ventilation is provided by my half-arsed external cladding installation
I've just been going down the rabbit hole on this and I think you either have to heat to above the dew point or have ventilation. Some people on pistonheads have bathroom fans with humid stats, which sounds like a neat solution.
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Adequate ventilation
The two side walls have a screened/meshed off two or three inch gap at the top and I keep the two sky lights on the "just open a crack" latch setting. I assume there's enough of a cross breeze to help as I've had no issues with rust on tools. There is what looks like water damage on the doors but that is from splashback in rain as the deck outside it comes pretty much right up to the threshold. It's done nothing more than discolour the wood at this point though. I tend to treat the front face of the shed when I'm doing the annual deck oil though which helps with beading a lot of that rain splash off.
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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.
hugo7
stevo_com
christianSpaceman
I build guitars as a side hustle, and it's main use will be as my workshop for that.
Ideally I'd like to get to a position where I could leave my wood / work in progress in there without their moisture content changing too much, but I don't think I'll ever get there with the cheap /small shed that I'm starting with.
However, I do definitely want to stop my planes and chisels from getting dew forming on them, which means that the temperature can't be allowed to drop too low. That means that I'll definitely have a heater on a thermostat, and given that I feel therefore I should insulate it as much as possible to keep the running costs low.
It'll also help with not annoying the neighbours with keeping the noise down at the weekend.
I'm almost certainly overthinking it, just that since I'm setting up a new shed now and I won't be doing this again in the next ten years I want to do it in the correct way.
edit: Hardboard sheets are a good call for the walls / ceiling. I'll likely use that, with some ply for the main wall that I'll hang tools off