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Hanging metal web floor joists

Posted: Thu May 28, 2020 9:17 pm
by Holychihuahua
With metal web timber floor joists where two 5 meter lengths of 100mm x 50mm are connected to by metal webs giving joists a 250mm depth. Why is the joist only hung on the top 100mm x 50mm length. The ends of the bottom lengths do not hang on anything why?