Timber beam sag

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  #1  
Old 09-18-15, 02:13 PM
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Timber beam sag

I'm doing some planning for a patio cover structure which will be constructed of doug fir timbers (posts, beams and rafters). I have some options for the patio sizing as well as the sizes of the members. I know how to use the WWPA beam calculator and StuCalc to get maximum spans, and I usually use 50% max fb and Total Load max defl of -0.25 inch as my limits, so I'm being very conservative to start with. However, there's been one question that's been dogging me, and that is how to select spans and sizes to guard against beam sag?

Got any suggestions?
 
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Old 09-20-15, 01:24 PM
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Well nobody responded but I kept on looking and I think I have an answer. I think setting the deflection limits to L/480 or L/600 should insure minimal beam sag.
 
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