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Old 09-13-2010, 11:19 PM   #1
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2nd floor joist


I am building an office addition in a warehouse with a loft above the office. I installed 2x6x12 joist. When I walked on them to test the strength, they were bouncy. What can I do to make it more sturdy?
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Old 09-14-2010, 12:03 AM   #2
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2nd floor joist


Was there any calculations done when you chose 2x6? Did you check with span tables?
IMO, you really should use at least 2x8.

Now that its up though, I'm not totally sure what you can do. Maybe sister in some addition joists. I'll let someone else chime in on that.

Last edited by acerunner; 09-14-2010 at 12:05 AM.
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Old 09-14-2010, 01:20 AM   #3
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2nd floor joist


i agree with the post above. I probably would have used 2x10's for that. Your only real options are

add more joists
put a beam in the middle to support the middle
live with it
rip it out and use 2x8 or 2x10's
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Old 09-14-2010, 02:00 AM   #4
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2nd floor joist


If tearing it all out is not your game, maybe you can add height to the existing joists by putting a 2x4 under them (vertically, of course) and glue and screw plywood to both members. Use the longest plywood you can get (9'?) and put the extra boards/plywood on the center of the 12' span. Either that, or put plywood and 2x4s full length on both sides, staggering joints on opposites sides.
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Old 09-14-2010, 02:01 AM   #5
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2nd floor joist


2X6 by 12' is too small a joist to use.

You will have to sister it up or rip the whole thing out and use 2X8 or 2X10 depending on your code and load caluatuations is.

Or the wooden I-joist will work ok if the code do allow it.

Merci.
Marc
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Old 09-14-2010, 03:09 AM   #6
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2nd floor joist


Quote:
Originally Posted by rocke View Post
I am building an office addition in a warehouse with a loft above the office. I installed 2x6x12 joist. When I walked on them to test the strength, they were bouncy. What can I do to make it more sturdy?
Ask the architect who drew the plans what to do. It's an office, you do have approved plans, right?
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