^^^ start by changing out the roof for ply with a waterproof covering. Add 25mm Celotex or similar insulation to roof and that may well be enough. Worth adding some side vents to allow air to circulate too.
do they still do those back packs with the spray expanding foam ? maybe you could simply spray the whole roof with a thin layer of that?
Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM
i'd unscrew the tin sheets, fit plywood or sterling board (osb) with a damp proof membrane (plastic sheet) on that followed by refitting the tin sheets. if you want to put insulation either under or over the boards that wouldn't hurt too.
need a job done on your project? i may be able to help.
More food for thought there. I haven't commited just yet but I really like the idea of that there foam stuff. Regarding the air circulating; there's plenty of that to be honest. If you imagine Jed Clampett building a lean to but then had to let Jethro take over, with his eyes shut, wearing a blindfold it's a bit like that. To be fair, that's the look I was trying to achive; (just as well really 'coz that's about my skill level) a Ranch type affair which does suit the rest of the place. However, I didn't factor in a Tropical Rain Forest inside the building. Haha. Thanks for the input; all great idea's to be honest.
I have a carport / incomplete garage which is open one end . Roofing is concrete sheet and no condensation in the year it's been up.
the reason for the condesation is the roof is reaching the dew point of the surrounding air,i used to commercially spray polyurethane expanding foam in all sorts of buildings on all types of roof.it was the best and ultimatley long term cheapest way.if you just put up insulation board you will have to seal it from the outer roof otherwise the moist air will find its way through and still condense into waterthat will cause other problems(rotten roof beams/mould/etc.
At the moment, it seems to be winning in the 'what to do next' stakes although nothings been set in stone at the moment.
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