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Re: Open Web Stl Joist Bridging[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Open Web Stl Joist Bridging
- From: Charles Greenlaw <cgreenlaw(--nospam--at)speedlink.com>
- Date: Mon, 09 Nov 1998 21:22:18 -0800
A carpentry spec will never require driving the nails point first and expressly prohibit driving them head first. There are usually general contract provisions that require "good workmanship" or something of that nature, and in my state at least, licensed contractors are bound by their licensing laws to follow recognized trade standards in the way they build, to the extent the architect or engineer has not directed otherwise. Presumably you have these general expectations in your situation, too. You give several well-recognized bases for your position that hanging these features from truss bridging is not in accordance with good standards. What authoritative basis does the field person have to the contrary? Your CD's didn't need to prohibit everything that is recognized as bad prectice; that field person's response is lame. Charles O. Greenlaw, SE Sacramento CA At 10:54 PM 11/9/98 EST, you wrote: The roof framing >includes open web bar joists which are laterally braced with diagonal(single >angle) cross bridging. The problem is the mechanical subcontractor has >supported HVAC ductwork, via sheet metal straps, from the cross bridging. I >also noticed a few sprinkler drops also supported by the cross bridging. I >indicated that this was unacceptable since joist bridging is not intended as a >support for mechanical equipment. Naturally, the field response was "show me >where this prohibition is indicated within the CD's". > > Normally, a project's steel joist specification includes this requirement. >However, no new steel joist installation is required for this project and an >associated spec section was therefore not included within the CD's. Nor does >the project's general mechanical specification does not address this issue. >Our office's mechanical engineer stated that SMACNA does prohibit this type of >support. I also reviewed the SJI spec's and again found no definitive >direction. Can anyone refer to other guidance for this type of situation? > >Thanks, > >Charlie Canitz, PE >Bel Air, MD >
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