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Originally Posted by frank
The biggest problem (aside from the issues associated with additional glass the limited photons will need to travel through) would be the issue of how very dirty the roof/glass surface would get exposed to the element and this would without doubt adversely affect your viewing experience.
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I doubt that it would be as much problem as turbulence generated from heat stored in the roofspace and escaping from the house at night. I think you'll find that the amount of air movement generated over your house roof would be a significant factor, at least until (and if) the house attains equalibrium with the oustide air.