10-10-2008, 02:58 AM
The deflection would be determined only with the design specifications. There is no single answer. Span, joist height and gage and design load all factor in.
I don't know much about your SIP roof but would suggest that a steel joist can or will out perform a wood joist most every time.
I don't know much about your SIP roof but would suggest that a steel joist can or will out perform a wood joist most every time.
Assume the best and ask questions.
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