Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Are Roof Top Units considered Dead or Live Loads?

[Subject Prev][Subject Next][Thread Prev][Thread Next]
After an old roof collapsed here due to a forklift
accident, the roof was weighed and found to weigh
30 lbs/sq ft after many re-roofings.
Gary

On 4 Jan 2005 at 7:37, Garner, Robert wrote:

> 
> Good point.
> 
> How many of us include re-roofing allowances in our roof design loads?
> 
> Bob Garner, S.E.
> 
> -----Original Message-----
> From: James Cohen [mailto:jccpc(--nospam--at)msn.com]
> Sent: Tuesday, January 04, 2005 7:17 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Are Roof Top Units considered Dead or Live Loads?
> 
> 
> I have always considered it a dead load. The value should be easily
> determined and it is fixed. Roof structural support systems are often
> designed for a specific layout of roof top units and any relocation or
> change in load needs to be reanalyzed. The same holds true for the
> actual roofing system. I have seen too many instances of single ply
> systems being replaced with heavier torch down assemblies or addition
> of ballast without reanalysis and consequent problems arising.
> 
> James Cohen, PE
> James Cohen Consulting, PC
> http://expertpages.com/jccpc
> 
> ----- Original Message ----- 
> From: "Daniel Boltz" <dboltz(--nospam--at)1st.net>
> To: <seaint(--nospam--at)seaint.org>
> Sent: Tuesday, January 04, 2005 09:58 AM
> Subject: Are Roof Top Units considered Dead or Live Loads?
> 
> 
> > I've had different answers from various Senior Engineers.  Some say
> > that
> since the RTU weight does not vary in magnitude and location, it is a
> DEAD LOAD.  Others say that if the RTU is changed or moved in the
> future, it's weight and location would be considered a LIVE LOAD. > >
> Any help is appreciated. > --Dan > > > > >
> ________________________________________________________________ >
> Sent via the WebMail system at 1st.net > > > > > > ******* ******
> ******* ******** ******* ******* ******* *** > *   Read list FAQ at:
> http://www.seaint.org/list_FAQ.asp > * > *   This email was sent to
> you via Structural Engineers > *   Association of Southern California
> (SEAOSC) server. To > *   subscribe (no fee) or UnSubscribe, please go
> to: > * > *   http://www.seaint.org/sealist1.asp > * > *   Questions
> to seaint-ad(--nospam--at)seaint.org. Remember, any email you > *   send to the
> list is public domain and may be re-posted > *   without your
> permission. Make sure you visit our web > *   site at:
> http://www.seaint.org > ******* ****** ****** ****** ******* ******
> ****** ********
> 
> 
> ******* ****** ******* ******** ******* ******* ******* ***
> *   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
> * 
> *   This email was sent to you via Structural Engineers 
> *   Association of Southern California (SEAOSC) server. To 
> *   subscribe (no fee) or UnSubscribe, please go to:
> *
> *   http://www.seaint.org/sealist1.asp
> *
> *   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
> *   send to the list is public domain and may be re-posted 
> *   without your permission. Make sure you visit our web 
> *   site at: http://www.seaint.org 
> ******* ****** ****** ****** ******* ****** ****** ******** 
> 
> The information contained in the e-Mail, including any accompanying
> documents or attachments, is from Moffatt & Nichol and is intended
> only for the use of the individual or entity named above, and is
> privileged and confidential.  If you are not the intended recipient,
> be aware that any disclosure, dissemination, distribution, copying or
> use of the contents of this message is strictly prohibited.  If you
> received this message in error, please notify us.
> 
> ******* ****** ******* ******** ******* ******* ******* ***
> *   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
> * 
> *   This email was sent to you via Structural Engineers 
> *   Association of Southern California (SEAOSC) server. To 
> *   subscribe (no fee) or UnSubscribe, please go to:
> *
> *   http://www.seaint.org/sealist1.asp
> *
> *   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
> *   send to the list is public domain and may be re-posted 
> *   without your permission. Make sure you visit our web 
> *   site at: http://www.seaint.org 
> ******* ****** ****** ****** ******* ****** ****** ******** 



******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ********