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Old 11-01-2017, 11:39 PM   #18
cx
da Home-builder -- Moderator-at-Large
 
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 85,153
Wayne, I don't believe the joist manufacturer would accept any attachment to the top chord at all in your proposed application. I've never asked one of them, though, but I know they can be really sensitive to anything that might damage a chord.

I think the attachment of a block, similar to a squash block, to the sides of the web and attaching your cross-blocking to that would win manufacturer's approval. I have gotten approval for that on one occasion. For that we used construction adhesive and a vertical block on each side of the web with the blocks screwed together through the web section. We were then able to attach to the vertical blocks.
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