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Re: Sagging Ceiling Joists

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The lag screws will not be able to lift the sagging joists if the threads
are still in the upper member when they engage the lower member.  You would
need to oversize the holes in the upper member in order to use the screws to
lift the lower member; but then the shear capacity needed make the two
members act as a composite would be lost.

Nels Roselund
Structural Engineer
South San Gabriel, CA

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