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RE: Lt Ga Metal Trusses

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I've done several schools using lightgage metal trusses (in the $20
million range), and you can spec them just like wood trusses.  Make sure
your manufacturer and specialty engineer have good experience doing
similar projects.  I have seen screwed and welded trusses.  Both can
work fine, if constructed properly.  Be wary of the guy that wants to
field fabricate.  This can cause many problems if the crew building the
trusses is not properly supervised.  We had one project where they field
fabricated with screws, and the screw counts were all over the place,
and if they could not find the right web, they "picked" another that
looked like it might work.  That job put a contractor, fabricator and
several other subs out of business.

If I had my choice, I would specify welded trusses that were shop
fabricated.

Several of the big wood truss manufacturer's and metal stud
manufacturer's have their own proprietary metal stud trusses now.  Check
out Dietrich, Mitek, Alpine, etc.'s web sites.

When attaching metal deck, definitely screw it.


Charles F. Espenlaub, III, P.E.
Martin-Espenlaub Engineering



-----Original Message-----
From: Michael Zaitz [mailto:mzaitz(--nospam--at)hgbd.com]
Sent: Monday, July 17, 2000 4:21 PM
To: seaint(--nospam--at)seaint.org
Subject: Lt Ga Metal Trusses


Hello,

Is there any information available for writing a specification for Lt Ga
Metal
Trusses?  We have our first school involving them and are planning on
using the
same philosophy as for wood trusses.  Provide a specification and have a
specialist in these things design them.  Any critical issues I need to
worry
about?

On a related issue.  I don't think welding anything thinner than 16
ga.is
practical so that is the min ga I am planning on using.  However, how
would metal
deck be attached to the trusses?  Using TEK screws or welded same as to
bar
joists?

Thanks,

Mike


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