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RE: Retrofit Involving Steel Joists

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In my experience the joist manufacturer always designs and details the
joists if they are specified as SP joists.  The Engineer must provide a
loading diagram for each type of SP joist in order for the manufacturer to
properly size the components of course.  I don't see why the fabricator
would design the joists when this is the joist manufacturer's specialty!  On
the other hand, sometimes people don't always do things in the most logical

William Pulyer PE
Charlotte, NC

> -----Original Message-----
> From:	Polhemus, Bill [SMTP:wlpolhemus(--nospam--at)]
> Sent:	Tuesday, February 22, 2000 3:43 PM
> To:	'seaint(--nospam--at)'; 'structx(--nospam--at)'
> Subject:	Retrofit Involving Steel Joists
> I've got a little job where we must add some medium-heavy (IMO) equipment
> to
> the roof of an existing building. I know who supplied the roof joists; I
> have the original engineer's drawings where he called out the joists
> (incl.
> the SP joists for equipment loads at the time the building was designed).
> I called the joist manufacturer, and he pointed me back to the steel
> fabricator, saying "he only gave us a fabrication list, he detailed the
> steel".  But a call to the steel guy yields only a finger pointing back
> the
> other way!  He claims "we wouldn't have done anything different from what
> the engineer prescribed".
> Only problem is, this doesn't answer the question of who designed/detailed
> the "SP" joists which are diagrammed on the engineer's drawings.
> I want to know who I should expect to have this design data.
> Can someone give me some opinions and guidance on this?