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Old 03-23-2011, 11:48 PM   #31
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Floor bounce and vibration


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Old 03-23-2011, 11:49 PM   #32
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Floor bounce and vibration


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Old 03-24-2011, 12:22 AM   #33
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Floor bounce and vibration


meature
Good! - much better picture.
I see the space between the joists, and the duct work.
As far as blocking goes -from what this last picture shows -
try to get the blocking in, dead against the top and bottom chords of the
joists - and sitting, tight on the top of the bearing wall in the basement.
Looks like 2 X 10's would be called for.
Don't be concerned about contacting the "webs" of the joists -
they're the part of the joists that have to do with "vertical" load transfer -
(the "webs" look like plywood).
If you want to go the "extra mile", measure down from the bottom of the
sub floor to the top of the double top-plate on the bearing wall, in the basement, and rip down 2 X 12's to fit fairly tightly.
If the blocking is going to come into contact with the surface of the
sub floor - apply some type of construction adhesive/glue between the
bottom of the sub floor and the blocking. (No squeaks)
In your last picture, I see 3 spaces between joists that you should be
able to do this in.
Do this, to all the spaces between the joists that you can.
One good thing I notice, your joists appear to run, unbroken over the
bearing wall! Excellent!

I'll be back later!

RF
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Old 03-24-2011, 12:30 AM   #34
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Floor bounce and vibration


Sorry!
I didn't see the very last pics that you posted.
What I posted in my last post - still applies -
block all the spaces between the joists that you can.
I'll be back!
RF
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Old 03-24-2011, 05:09 PM   #35
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Floor bounce and vibration


Thanks Rossfingal

Yes joists are continuous.
In that last picture do you think putting in a 2x4 each side of that duct above the bearing wall will help with support?

I guess the most vulnerable part from a structural standpoint are the end points for that beam between first and second floor. If I can be sure there is blocking under that point load I should be OK????

I have ordered some 2x4s to double up studs and some to use as I think the term is smash blocks to provide some support.

Also, orderd some i-joists to cut up and use as blocking--two rows at 1/3 point of span. This is just to help with bounce/vibration problem--not structural.
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Old 03-24-2011, 08:42 PM   #36
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Floor bounce and vibration


I'm talking to some of my "compatriots", concerning your "pics" -
more to follow.

"Quote"
"If I can be sure there is blocking under that point load I should be OK????"
Yes, check that!!
Also, make sure you have adequate support, within the basement, bearing
wall, at the ends - under the LVL beam in the first floor above -
(Doubled and/or multiple 2 X 4's - don't "skimp" on the wood!)
(Don't mean to be "redundant" - just like to see things made right!)
It looks like you're on the right track!

Regards!
RF
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Old 03-24-2011, 10:28 PM   #37
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Floor bounce and vibration


Rossfingal, thanks, that's a great way to do business, do it once and do it right. Wish everyone operated that way. I'll definitely double up the studs--pretty inexpensive.
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Old 03-28-2011, 05:36 AM   #38
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Floor bounce and vibration


meature

Need any further "feedback"?

Good luck!
rossfingal

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