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Can make a big difference to how heat is absorbed by the roof and walls by :
- painting them white (make sure it reflects well in IR range too)
- buying galvanised metal sheets and installing them as is. (not terribly good)
- shading the east , north and west walls (put the shed close to north fence, or grow some greenery along the walls .... plenty of fast growing natives that'll do the trick.
- insulated roofing sheets (like are used for patios) with integrated foam insulation are a great choice too , most your heat will come in via the metal roofing sheets , is reradiated to the interior of the shed (my double garage is a hot box in summer when closed up because the roof , though galvanised) is not insulated.
Eric's double skin roof idea is also worth trying (especially if you have an existing shed which would be expensive to modify).
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