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1. So you will have 3 large 4'-2" wide by 11' long glass panels laying flat on your roof beams? The edge of each glass panel with be supported by a couple of inches of the beam, correct?
2. What city and state are you located in for possible snow load consideration?
3. Do you have any idea of the weight of each individual glass panel?
I’d like to point out that a Professional Engineer’s standard of care typically includes a site visit to assess field conditions and get an overall understanding of the structure. This can obviously not be accomplished through the internet. The information provided here is meant for planning purposes only (general sizing and budgeting) and is based on the information provided by you. All loading cases considered are for vertical loads only, no lateral analysis has been completed. The information should be verified by a professional engineer who can visit the site to ensure that potentially important information has not been overlooked or omitted.
Here are my assumptions for your beam sizing:
Tributary width = 4.5’
Beam Span = 11’
Live Load = 10 psf
Dead Load = 12 psf
You can use 4”x10” Cedar (#2 grade) beam
There will be less than ¼” of deflection at midspan under full load
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