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Hi - When I built my observatory I put in a raised wooden slat floor with 5mm gaps between boards (just enough to drop small screws through) - the floor is a minimum of 300mm off the ground.
With the roof rolled over it acts like an old fashioned meat safe and the warmer roof draws colder air up from underneath the building - on a hot day it will be 5 to 10 degrees cooler in the telescope room than outside.
This is a byproduct of the main reason - the observatory is situated on top of an exposed ridge and the floor is designed to equalize air pressure inside the building in high winds and reduce the risk of losing the roof.
Cheers
Geof Wingham
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