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In some parts of the US, snow load has a lot to do with it. We had quite a lot of structural failures around here a couple of years ago, although I think they were nearly all large commercial buildings with flatish roofs. If you don't move the snow off them before it exceeds the design lmits, they can, and do, collapse.
Why not glass dormers?
Building/constructing a green house, fully equipped with plants, mammals, birds and bees.
Quote from: maffsolo on 20/10/2010 12:02:27Building/constructing a green house, fully equipped with plants, mammals, birds and bees.Yes, I'd like to also include some atmosphere, weather, some gravitation and day/night cycle I just wonder in this day and age whether we are still better off covering our roofs with multiple ceramic squares, or can we be cleverer (for approx. the same cost)?
Glass roof construction is perfectly feasable, but more expensive and as pointed out can be difficult design in a sensible way to avoid wide swings in temperature. Historically, small pane size and insulation issues have been big factors agaisnt glass roofs as well as difficulties in waterproofing between panes/ frame...
You must be looking for something like thishttp://www.greenhomebuilding.com/growyourfood.htm
Looks like a bijou residence to me.