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Unread 08-12-2009, 01:40 PM   #8
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 95,318
You'd customarily "sister" the joists to create a 4x6 using two 2x6s, Alan. If you could find a way to actually attach the members such that you end up with a 2x12, that would be far, far more rigid, but I don't have any eye dee how a fella'd do that.

I also have no eye-dee what Joey had in mind for his 2x12 joist hangers, either. Maybe he'll tell us.

For adding the mid-span support, his suggestion of doubled 2x6s would be OK so long as you have a way to support the new beam every five or six feet. It's usually easier to use deeper beams and fewer supports, but I can't see what's under your floor from here.

My opinion; worth price charged.

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