Looking to build a 20 x 40 under ground storage building which will be built out of 10 inch cinder block filled and reinforced with concrete and #5 rebar metal deck roof with a 4 inch thick concrete roof reinforced with #4 rebar and covered with 1ft of earth. Need to know what size I-Beams I will need to carrier the load on a 20ft span. Project in SW Virginia.
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Greetings I am a structural engineer expert in residential commertial building let help you with this calculation for wind snow and gravitational loading