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RE: Weights for design

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Per ASCE 7:
Fiberous Glass Insulation is 1.1 psf per inch of thickness.
For sprinklers, I break down what is being used for pipe, how often it is being used, the volume of the pipe and the additional weight due to the water.  Tack on a little bit of fudge factor for fittings, spread this load out over the entire roof area, if I see it is possible, badda-bing badda-boom, I have a dead load.
For industrial buildings been known to have upwards of 10 to 12 psf for dead load, but that includes roof sheeting, purlins, and what have you.  I do, however, take a quantitative look at things, and come up with a good, and even conservative, additional dead load onto the structure.
Dave Maynard, PE
Gillette, Wyoming
-----Original Message-----
From: David Smith [mailto:smith1129(--nospam--at)]
Sent: Tuesday, March 08, 2005 12:22 PM
To: seaint(--nospam--at)
Cc: smithassociates(--nospam--at)
Subject: Weights for design

I am reviewing the loads for wooden trusses on a church roof.  The architect specified R30 insulation and automatic sprinklers.
It looks like the weights for each of these can vary all over the map.  I would appreciate seeing some typical design weights used by the rest of you.
Dave Smith