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Re: Acoustical Ceiling Support

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If the architect is really worried about it, ask him if we wants to pay a
premium for joists to space them closer together.  I've never heard of joist
spacing being governed by acoustic tile support wires.  how much does
acoustic tile way anyway - say 0.25 psf!!

Why not hang the acoustic supports from the deck or connect to some of the
bridging and bracing systems inside the joist spaces.

Remember to always hang items off the top chord of the joist.  The bottom
chord joint connection design is only good for transferring horizontal
components of the web member forces, there is usually nothing left for the
vertical, as the net vertical force at the joint is zero.

Regards,

Hans E. Boge, P. Eng.
-----Original Message-----
From: Khosrownia, Ghassem SPK <GKhosrownia(--nospam--at)spk.usace.army.mil>
To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
Cc: Kutch, Wayne E NWS <Wayne.E.Kutch(--nospam--at)NWS02.usace.army.mil>; Erland, Steven
R NWS <Steven.R.Erland(--nospam--at)NWS02.usace.army.mil>
Date: Friday, September 22, 2000 3:14 PM
Subject: Acoustical Ceiling Support


>Anyone has experience with suspended ceiling support problems when roof
>joists are not spaced at 4 feet or less on centers? I am facing an annoying
>situation where an architect is claiming that 1500mm is too far for
standard
>acoustical ceiling grid system support. I have looked at our specifications
>and it does require the wires to be plumb. However, even if the joists are
>spaced at less than 4 feet there is no guarantee that the wires will be
>plumb, is there? Thanks for your input.
>
>Ghassem.
>
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