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Unread 01-03-2020, 01:17 PM   #13
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Join Date: Jul 2005
Location: Fairfax, Va
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Unless your joists are insufficient for meeting L360 you don't need to "sister" them to add strength,. So you'll basically only be adding cleats to the sides to give you something to support the ply and give you something to screw into. 2X3's will be fine, even if you have to notch them, so long as the notch isn't too deep and is of a short length.

Correct about a wall that falls between, and parallel to, the joists. Gotta add some framing to hold it up.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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