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Old 09-05-2009, 05:43 PM   #1
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Will it sag?


Hello,

I have a 4x6 spanning about an 18' distance. This will eventually support the edge of a lightweight polycarb panel.

I would like to raise the height of this beam by attaching a 4x4 on top of it. Question is, will the added weight cause a potential for sag? Or if I secure it with 6" lag bolts every four feet or so across the top will it actually add more rigidity?

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Old 09-05-2009, 09:16 PM   #2
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Will it sag?


This sounds like an engineering question. I know a 4x6 Hem-Fir will carry 906#, if spanning 13', but your span is off my charts. Sorry.
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Old 09-07-2009, 10:13 AM   #3
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Will it sag?


will it sag? Yes!
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