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RE: [Seaint-SEAOSC] Nfpa

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Yes - we are reading the ASCE the same way, but for ballasted arrays - 
which is fairly common, we have anecdotal examples of projects in 
California and Hawaii where the ballasted arrays were treated as 
"temporary" loads and therefore justified as a part of the available roof 
live load. We are not accustomed to this approach and trying to find 
evidence in the NFPA that does not allow tis practice.

Matthew Stuart
Pennoni Associates Inc.
Office 215-222-3000 x7895
Mobile 908-309-8657 | mstuart(--nospam--at)

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Harold Sprague Sent: Friday, February 01, 2013 12:23 PM
To: seaint-seaosc(--nospam--at)
Subject: Re: [Seaint-SEAOSC] Nfpa

I do not have a current copy of the NFPA Life Safety Code, but I recall 
that it references the ASCE 7.

Per ASCE 7
Dead loads consist of the weight of all materials of construction 
incorporated into the building including, but not limited to, walls, 
floors, roofs, ceilings, stairways, built-in partitions, finishes, 
cladding, and other similarly incorporated architectural and structural 
items, and fixed service equipment including the weight of cranes.

ROOF LIVE LOAD: A load on a roof produced
(1) during maintenance by workers, equipment, and materials and (2) during 
the life of the structure by movable objects, such as planters or other 
similar small decorative appurtenances that are not occupancy related.

If it is "fixed" it is a dead load and should not be counted as live load.
As an extreme example, if the solar panels weighed 20 psf, and your roof LL 
 is 20 psf, you have zero capacity for the maintenance workers.

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