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HomeMy WebLinkAboutB16-0502_Structural load Info_1489511700.pdf1 Jason Weingast Subject: FW: Matterhorn Solar From: Sean Kerrigan <sean@kerriganengineering.com> Sent: Thursday, February 16, 2017 10:14:52 AM To: Matt Hansen Cc: Mark Hallenbeck; michael@currentarchitects.com; Jason Weingast Subject: RE: Matterhorn Solar The design load for the roof (including the roof portion over the front entry) is 100 psf live load to account for the snow and 10 psf dead load to account for the self-weight of the roofing and structural material and miscellaneous lights, conduit etc. The actual weight of the structure and roofing is approximately as follows: 2x8 rafters – 2.5 psf Plywood - 2 psf Misc. - 1 psf Metal Roof – 1 psf Total 6.5 psf This leaves 3.5 psf available for solar panel weight. Typical solar panels weigh 2 to 4 psf. The structural members are oversized about 15% to handle any unforeseen loading. So, even if the panels weigh 5 psf the structure is adequate. Let me know if you need anything additional regarding structural capacity for solar panels. Regards, Sean Kerrigan, P.E. Ph: (970) 331.4733 Sean@KerriganEngineering.com Engineer stamp is required on this letter. 03/14/17  22  Required Information for Permit                         . Step 1: Structural Review of PV Array Mounting System                          03/14/17 23      If No, submit completed worksheet for roof structure WKS1.                                                                    03/14/17