Not steel but we also had limited roof space for solar. It’s a bit shaded at times but it’s now in its second year and with a few panels on the garage the past 2 months we have covered our usage completely. Think I posted this on another thread somewhere but here it is.
The old carport had 2x10 rafters with a poly carbonate panel roof. Kept the posts and beams and timber framed the new structure. Built and test fit before final assembly.
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OSHA violations as the installers went to work.
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View from garage attic window before solar install.
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Final product hard at work charging the car.
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Hardest part is sealing between the panels if you want it water tight. Lots of expansion and contraction that messes with the caulking. Had to get an engineer to sign off on the snow and wind loads for the city.