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Old 10-18-2013, 11:55 AM   #16
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Blocking Between Floor Joists - Important?


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Originally Posted by ddawg16 View Post
Hopefully Daniel H will chime in...
What would we do without Daniel and the Garys to keep us amateurs in check?!

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Old 10-18-2013, 04:26 PM   #17
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Blocking Between Floor Joists - Important?


Dear advocate of the Devil,

Alignment: This is not a code requirement but rather a side benefit, I apologize if I made it sound otherwise.

Rolling-Bracing: Bottom chord bracing (strapping) is another method to brace the joists and is permitted by the R502.7.1 of the IRC. In my personal opinion (and not required in the IRC) bottom cord bracing should have structural terminations (triangulation, panelizing, X bracing, bridging, etc.) at each end of the run to be as effective as continuous blocking. There come those pesky squeaks again. In commercial steel construction such terminations are standard.

Squeak Sources: I don't contest that blocking was the source of the writer's squeaks and it appears that he has found a better floor assembly that is quiet. That said, it has been my experience floor squeaks have nearly always been attributable to poor deck attachment to the joists and/or marginal joist sizing. In any case, thicker floor decking and adhesive is a good upgrade which, in addition to improved load distribution, also adds mass bettering the sound deadening qualities.

Dismissive: I disagreed with the first paraphrase of the article "bridging does little more than cause squeaks" and the second quote that "......seasonal changes in humidity cause the joists to shrink and swell enough to render any type of bridging worthless". Wood framing does in fact shrink and swell but that doesn't make the bridging worthless. I think I would have been more agreeable had he described bridging as unacceptably annoying.

Other Alternatives: a) Use galvanized steel bridging which does not vary dimensionally with humidity levels. b) Switch from wood framing to steel.

Rick

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