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Unread 12-11-2020, 02:32 PM   #14
Kman's Avatar
Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
Posts: 11,877
You'd need to sister 2/3 of the span to cut thee deflection, so you'll need a 10' 2x for that.

It should be glued and screwed to the joists to make it effective.

Or you could shorten the span a few feet as an alternative.

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