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Unread 11-18-2020, 08:50 AM   #33
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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No, not cross-bracing for benefit of the joists, Nick, but cross blocking for benefit of the wall support. Just putting short pieces of 2x material between the joists at the top to support that wall. Could be as small as 2x4 material, but 2x6 or larger are generally just easier to fasten. I'm a big proponent of adhesive in all parts of a subfloor structure and would add construction adhesive when I installed these new support blocks to ensure I was not introducing any irritating squeaks.

I would also "un-weight" the wall above when installing the blocking. Don't need fancy pole jacks to do that, you can do it quite effectively using 2x4s levered up from the floor below.

My opinion; worth price charged.
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