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Bryan, forget using colourbond, you will just be creating a dew collector. I live on the water, with a colourond garden shed, I know what happens.
When I built my observatory I used two big principles:
It had to be off the ground on stumps so that air could circulate underneath, and it would be built of standard stud wall construction with marine ply exterior panels. The roll off roof, is also stud framed with ply sides and top is corrugated poly roofing, with insulation on the underside. This observatory has been in use for five and a half years with no damp problems at all.
The pier footing was poured before construction, and it rises through the observatory floor, without touching the flooring.
Stumps are bedded in concrete, then a standard heavy timber deck frame was built and topped with ply tongue and groove flooring. The walls were built flat on the deck then raised into position, and corner braced. All standard house construction process.
It has survived sustained winds of 100kmph during east coast low storms, and it does not leak. The internal side of the walls require no insulation, they do not sweat like metal would.
I did have a small solar powered exhaust fan for the first few years but after it failed I just left the ridge vent, it is fine.
So I am saying, don't just rush to colourbond, it is not the best way to do it in our environment.
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