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Hi Roger and all contributors to this thread. I am also planning to build a roll off observatory using coolroom type sandwich panels.
The previous owners of our property had a coolroom built to house their tropical fish and I just use it now for storage of my alco and astro stuff. I am impressed with how it handles the brutal temperatures in central Vic (from 45+ in summer to minuses in winter). Admittedly it is not an overly humid climate but have never noticed any condensation in the coolroom even at times when the underside of our steel verandah roof is dripping with winter condensation.
I suppose the discussion would not be complete without input from people with observatories made of other materials eg brick, concrete block, wood, or even commercial fibreglass domes about common problems, so would welcome input from the wider group of observatory owners.
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