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Old 11-30-2010, 12:01 PM   #16
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Originally Posted by mshoffman View Post
Hi George,

My exterior siding is vinyl.

I'm unfamiliar with blocking. Would this be a piece of wood between the I-joists at either end? The rim-board is attached with nails, and was supplied as part of the I-joist "kit".

The on-center spacing is supposed to be 16", which is how I installed it. Though I wish I would have bought a couple more joists and done 12" OC.

The floor is 3/4" tongue-grove plywood that is nailed and glued down to the joists.

Interesting. Would a panel closure involve attaching plywood vertically top to bottom down the length of each side of the joist?


Yes 12" O.C would be better or a double support every 4'. I agree with jiji1943 and Engineer10 placing a beam would take care of the problem the only thing i would do differently is that i would use an LVL to have one full continuous length and panel closure at the supported section. See attached link figure5 on panel closure;

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Old 11-30-2010, 06:29 PM   #17
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Thanks everyone for the suggestions. An update:

I (carefully) put a couple of 3" screws up through the bottom of the plywood floor into the interior wall I mentioned earlier. The noise is now completely gone. I can only assume mrgins was correct, the wall studs had shrunk and were rubbing against the floor when I stepped on the floor.

So, now I, once again, have a quiet floor. My question, should I still install the beam? Given the span and joists, should I be ok as is or do I need additional structural support?
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Old 11-30-2010, 10:18 PM   #18
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Mrgns was dead on. And so is Engineer10. A beam under the floor would prevent future problems caused by floor deflection. Nail the I-joists down with 2 10d's each. One on each side.
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