[Greenbuilding] Glass overhead doors for passive solar application?

[Dan Johnson]

Working on a passively-heated garden classroom on the chilly
California coast and looking for a manufacturer of glass sectional
overhead doors (like garage doors but mostly glass) with good
insulation (about R-17) and airtightness (I've seen as low as 0.1
CFM/linear foot). These doors will be on the south for solar gain,
and in warmer weather we'll open them up to the garden and work
indoors-outdoors.  Anyone know of a good product? I'm having trouble
finding something on the web.
Regards,
--Dan Johnson


 
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