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

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I find that the consideration of re-roofing weights is most important in wood framed structures.  As I noted in my last post, in So Cal, we design some fairly light weight wood framed roofs so a re-roof is a higher percentage than say in a concrete roof.  A three-tab re-roof for a residential structure (235 lb. per sq.) allow maybe 3 psf.  Commercial, maybe 5 psf.  A lot of buildings are being re-roofed in metal and this has to include the light gage support system for the roof panels.
Bob Garner, S.E.
-----Original Message-----
From: GSKWY(--nospam--at) [mailto:GSKWY(--nospam--at)]
Sent: Tuesday, January 04, 2005 1:11 PM
To: seaint(--nospam--at)
Subject: Re: Are Roof Top Units considered Dead or Live Loads?

In a message dated 1/4/2005 3:54:42 PM Eastern Standard Time, THunt(--nospam--at) writes:
Including one re-roofing weight is required for DSA projects in California (CBC 1607A.4.1).
What is typically used as a re-roofing weight? Is there a minimum allowable re-roofing weight?
I will also note that at least in post-tensioned concrete design, a small increase in the uniform load seldom changes the design.  That same total weight as a concentrated load can have a significant impact, however.
Gail Kelley 
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