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Old 11-02-2010, 11:32 AM   #1
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How to reinforce bouncy floors?


2x8 joists, 16 OC. Should I put 2x8 blocks between each joist in a staggered pattern? Right now there is 1x4 criss crossed, but that isn't helping much with deflection.

Any help is greatly appreciated.

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Old 11-02-2010, 12:02 PM   #2
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How to reinforce bouncy floors?


I ran a drop girder under my floor and it is stable enough for tile, no bounce at all.

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Old 11-02-2010, 04:30 PM   #3
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How to reinforce bouncy floors?


Cross bracing is designed to reduce lateral deflection. It does not reduce vertical deflection (the bouncy part of your floor). In order to reduce vertical deflection, you need to do one or more of the following:

1. Reduce the span of the joist by installing an intermediate support beam.
2. Increase the moment of inertia of the joist by sistering another joist (doubles the MI), replacing the joist with a deeper element (replace 2x8 with a 2x10 for example), or bolting a plate on the bottom or the sides (increases the moment of inertia).
3. Replace the joist with a structural element with a greater modulus of elasticity (replace a wooden beam with a steel beam).
4. Reduce the load on the joist (difficult to do in residential construction).

In residential construction, by far the most common is sistering each joist. Blocking helps a little, because you distribute load across multiple joists, but the transfer is not very efficient, so the reduction in deflection is usually small.
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Old 11-02-2010, 07:18 PM   #4
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How to reinforce bouncy floors?


Quote:
Originally Posted by luvdairish View Post
2x8 joists, 16 OC. Should I put 2x8 blocks between each joist in a staggered pattern? Right now there is 1x4 criss crossed, but that isn't helping much with deflection.

Any help is greatly appreciated.
Is this the same situation you said was 24" on center you were tiling on?
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Old 11-03-2010, 04:01 PM   #5
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How to reinforce bouncy floors?


http://books.google.com/books?id=1uY...lywood&f=false

http://www.finehomebuilding.com/PDF/Free/021184090.pdf

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