[RE-wrenches] truss loading

[Bill Brooks]

Thanks Jeff,

 

The multiple shingle layer argument is what is used in the Inspector
Guidelines. Thanks for a good overview of the issues.

 

Bill.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jeff Oldham
Sent: Tuesday, October 28, 2008 4:47 PM
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] truss loading

 

If trying the link that Bill supplied does not fully swing the LJO over to
reason try my tactic that has yet to fail me - I explain that virtually all
structures built in the last 30 years or so have engineered roofs to handle
both Live and Dead Loads, typically the Live Load is in excess of 12 p/s.f.
and is in addition to the Dead Load. The Live Load is for temperary loads
such as workers and materials. My pitch is simple; once I have placed my 3-4
p/s.f. of glass over the roof it has eliminated that area for any live
loads, because we do not walk, stand or place heavy materials on our arrays.
In essense I have eliminated the potential for Live Loads of >12 p/s.f. with
<4p/s.f. of array. This blatant logic has yet to be balked at except in
cases of some commercial projects and older buildings. Also in many
jurisdictions one is allowed to put a second layer of shingles over the 1st
w/o removal of the original and w/o Engineering, if this is your case and
the second layer has not been installed then this argument can also work as
our arrays are a fraction of the weight of most any roofing system.

Good luck!

 

-jeff o


>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
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