Advice needed on floor bounce


Old 09-28-07, 09:14 AM
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Join Date: Sep 2007
Posts: 1
Advice needed on floor bounce

Hi folks,
I have a split level house. The main floor is a great room with a kitchen. When I walk through certain areas of the great room, I get a pretty significant bounce. I finally poked my head into the crawlspace under the great room yesterday -- to find the joists were between 3-4 feet apart from one another, with concrete piers holding the floor up.

What's the best way for a flooring novice to decrease the bounce in this situation. I had read about sistering, but that doesn't seem like it would be sufficient with such a large gap between the joists. I'm not terribly excited about the idea of pouring a few new piers and adding joists, but if that's the best option I will do it. Would running a 2x10 or 2x12 between the joists using hangers help reduce the bounce?

Thanks in advance,
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Old 09-28-07, 06:54 PM
Join Date: Dec 1999
Location: South Dakota
Posts: 3,140
Your floor joists should be 24" apart at the maximum. I build mine 16" on center as a rule, and many are 12" on center. All of my floor joists are 2x12's.
Old 09-28-07, 07:02 PM
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Join Date: Oct 2004
Location: WI/MN
Posts: 18,648
I would definitely add more structure under there.

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