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Posted by on January 6, 2009, 2:39 pm
> > 24" is fairly common with I beams and engineered floor joists. =A0Are y=
ou sure
> > the sub is 3/4? =A0The simplest thing to do would be to run another lay=
er of
> > 15/32 osb on top of the existing sub floor. =A0Run it 90 deg to the exi=
sting.
> > Glue and screw.
> There would be more joists under each sheet if the sheets were run in
> the same direction as the existing subfloor. =A0If they're run in the
> same direction there's also more leeway in offsetting the sheets so
> the joints won't line up.
> To the OP: =A0If the main objection is for the first floor, you could
> stiffen up the floor more by adding additional blocking between the
> joists or by adding pywood/OSB to the exposed undersides of the first
> floor joists.
> R
Osb tends to flex more in one direction. Going 90 deg gives you more
rigidity in both directions. Blocking is not going to lower the flex
as much as a more rigid floor surface would. The more rigid surface
will transfer the load farther out. And this also involves the least
tear down.
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> basement. There is a lot of noise from the walls and subfloor (creaks
> and pops) when walking on it. I carefully screwed down the subfloor to
> the LP wooden I-beams, but this makes no difference since the 3/4 OSB
> that makes up the subfloor is sitting across I-beams that are 24" OC
> apart. I can visibly see the OSB flexing when stepping in gap b/w the
> I-beams. The OSB is 4x8' sheet tounge and groove on the 8' side. The
> span of the unsupported beam is about 19' with the longest beam being
> 29'.
> 24" seems a bit much to prevent minor floor noise. I am wondering what
> can be done to make the floor as quiet as possible. My solution up
> until now is to take up the OSB and install "struts" between the I-
> beams, but I am not sure how the strut should be constructed and how
> far apart they should be. Thanks for your suggestions!
> Chris