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[Subject Prev][Subject Next][Thread Prev][Thread Next] A few years ago I had some experience with a TJ-type floor system in a small office building that became a very major bone of contention.  There was excessive vibration throughout the floor, to the point where an acoustic engineer was hired to try to help figure out a solution.  Unfortunately I forget what the solution was, but it was a very difficult problem.  I urge you to be EXTREMELY careful about this.  Try to get the owner's/user's expectations clarified, the use, the occupants' sensitivity, etc.  In other words get the client on board, so that they participate in the discussion over what is good enough, since it's always a tradeoff of cost v. performance.  And DON'T CUT ANY CORNERS!  Trus-Joist doesn't devote a whole page in their catalogue to "Floor Performance" for nothing!

Good luck.  I think you'll need it.

Ralph Hueston Kratz, S.E.
Richmond CA USA

In a message dated 4/4/05 7:53:53 PM, dnae(--nospam--at) writes:

I would like to know if I have 28 ft to 30 ft span
I use 18 inch or 20 inch TJI at 16 inch on center
I any one has experience has a problem with

1- vibration
2- noise

and how to limit that
even if I limit the deflection to less than 1/2 inch

thanks in advance

Dave A,.P.E.