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RE: Question on wood Roof Trusses

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Had to go in the attics of 10 or 20 completed homes once.  Sent the bill to
the contractor.  Shit happens.  Just do your best to keep it from happening.
We try to get in the other guys' heads to understand were they may be coming
from.  That help us write our specs.  The contractor fixed the roofs and
paid us for our efforts by the way.  He had failed to send us the truss
drawings for review.


-----Original Message-----
From: Samir Ghosn [mailto:sghosn(--nospam--at)]
Sent: Tuesday, January 16, 2001 1:16 PM
To: seaint(--nospam--at)
Subject: Re: Question on wood Roof Trusses

Let's add to the Mix
The Designer took a deffered submittal.
The Building was approved for construction.
The Building is built and the plans were never submitted to the Building
dep. for review.
The building inspector has question the approval since it is not a part.
The general calls the Mayor and throughs a fit for incompetent staff.The
general gets the truss plans not signed on an 81/2 x 11 sheets with faded
print from fax copyies.
The building dept. has now to approve the truss plans eigh months after the
permit is issued without the complete package and now figure the load path
without original clacs.
The truss design ingnored to include the shear drag collector trusses.
Oh, there has to be a strap collector or something, but the truss co. not
responsible.It is the engineer of record problem.Hardware is the
responsibility of the EOR, not the truss co.
How many times have you guys out there specified Hardware for Girder
trusses? just curious.
Frankly, I have to say, all of the above is true senario and I hardly get
those plans for review once the permit is issued.  How do building
Departments control this, Ideas????
Samir Y. Ghosn, P.E.

The hrow a twist into this:
>If I am "responsible" for the bracing, and the contractor/truss supplier
>never submits the shop drawings, then who is really responsible?
>I have to beg and plead for shop drawings on commercial stuff, let
>alone residential.
>Dan Goodrich, P.E.
>----- Original Message -----
>From: "Neil Moore" <nmoore(--nospam--at)>
>To: <seaint(--nospam--at)>; <seaint(--nospam--at)>
>Sent: Tuesday, January 16, 2001 12:37 PM
>Subject: RE: Question on wood Roof Trusses
>> Tarek:
>> If I remember correctly, one of the TPI publications has an example of
>> ALL of the webs can buckle at once.  If the web bracing isn't anchored to
>> something, then this can happen.  Most of the time, the real loads never
>> approach the design loads and any buckling problem has moved into the
>> factor of safety area.
>> If people are designing trusses in snow areas, say 160 pcf, then our
>> discussions and the possible reprecussions become important.  My original
>> involvement in the web bracing responsiblity problem came about 6 years
>> in a court case.  That's were I found out that the responsibility is
>> hidden in the TPI specification, which the UBC refers you too.  How many
>> people owned the TPI spec?  Further, it is also difficult to interpret
>> results of the computer output.  That presentation can be, and may
>> have been, improved upon.  I've read where some engineers are going to
>> tough about this and make the truss company provide the web bracing
>> anchorage to the building or to the roof or somewhere.  Good luck!.
>> It still is important to review the truss company's layouts; you might be
>> surprised at what you will find.
>> Neil Moore, S.E.
>> >Peter:
>> >
>> >I personally have it in my specs that bracing the truss members is the
>> >responsibility of the truss designer for reasons too numerous to
>> >recount.this thread was started a while back so check the archives and
>> >particular excellent postings by Roger Turk .
>> >
>> >I think the bigger problem is getting the framer to actually brace
>> >the members that need bracing. and unless somebody shows him where these
>> >members are on the framing plan
>> >they aint gona walk the building with the little 81/2 x 11's from the
>> >truss engineer and do it( all they see is a little astrisk next to said
>> >members)
>> >incidently every framer that we worked with told me that they have never
>> >installed such braces and never knew they were even required .Generally
>> >engineers have some sort of a typical detail on their plans that refers
>> >back to the truss designer's calcs. good luck getting the framer to
>> >comprehend it.
>> >it is my opinion that unless the compression bracing is shown on the
>> >truss layout sheet with the appropriate details refernced to it nobody
>> >will follow
>> >my 2 cents
>> >Tarek Mokhatr
>> >strucural engineer