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My observatory is a 3x3m Metal shed, so had to do something or would have fried in there.
On the western wall I changed the facade to look like a western red cedar shed with silver foil in between the timber and metal wall.
On the north facing wall I have heavy duty shade cloth that can be rolled up like a blind when not needed. I also lined the inside of the shed with batts inbetween the north & west walls.
For the tin roof I bought a can (app $60) of Silver Ormonoid bitumen paint from Bunnings - this stuff is great, some of the guys use it at Leyburn and it gets very hot out there. I put 2 coats of the stuff on the sliding roof and I also used some 1 inch thick freezer (white foam) on the underside of the roof - I tried gluing this but it kept coming off so ended up screwing from below into the metal roof with large washers stopping the foam from pulling through. I also sealed the top of the screws that slightly poked through the top of the roof.
I also put a small ceiling vent into the sliding roof - they can be bought from caravan spare parts places. I have a locally purchased solar powered vent but haven't got around to installing that yet.
Has made a huge difference to the temperature inside.
PeterM.
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