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<br /> <br /> <br /> <br />July 3, 2019 <br /> <br /> <br />Mr. Justin Duke <br />Sunlight Solar Energy, Inc. <br />50 SE Scott Street – Suite #13 <br />Bend, OR 97702 <br /> <br />Re: OMD – Anderson Readiness Center - Solar Panel Attachment <br />3225 State Street <br />Salem, Oregon 97309 <br /> <br /> <br />Justin, <br />As requested, we have reviewed the solar array connection to the building structure at the above noted project site. <br />The purpose of our review is to determine the required spacing of the connection points to the existing roof structure. <br />The solar array consists of multiple arrays spread across several sections of roof area using Silfab SLG solar panels. <br />The panels are located on the southern half of the roof structure which is sloped at 4.75deg from the horizontal. <br />As provided by Sunlight Solar, the existing roof structure at the proposed solar array locations consists of 22ga Zip <br />Rib metal roofing, with seams at 16” o.c., over 20ga “Z” purlins spaced at 48” o.c. perpendicular to the metal roof ribs. <br />The “Z” purlins are supported by a structural metal deck over K series open web joists spaced at 7’-0” o.c. <br />The solar panels will be installed in portrait format with (2) rails along each row of panels as shown Sheets PV2.0 & <br />PV2.1 provided by Sunlight Solar. The rails installed at, and perpendicular to, the metal roof ribs will be Snap-N- <br />Rack standard rails with Snap-N-Rack L-Foot standoff bases; each solar panel shall have a minimum of two <br />supporting rails. The L-Foot is mounted to S5!-Z clamps that are attached to the metal roof ribs at 48” o.c. maximum <br />(therefore at every third metal roof rib) as shown on Sheets PV2.0/2.1 and detail 3 on PV4.1. Additionally, the S5! <br />standoff bases shall be staggered from seam to seam such that solar panel attachments do not fall on the same roof <br />rib at the same panel (with the exception of the edges of the array where the mount spacing occurs more often). The <br />rack and rail system supporting the solar panel array shall be reviewed by others down to the connection points. <br />We find that the solar array connections are adequate to support the required loading of the Salem area (120 mph <br />exposure B wind, 20 psf roof snow load, and the additional 3.25 psf dead weight of the solar panels). We have <br />reviewed the adequacy of the connection to the existing roof structure to support the required vertical and lateral <br />loads from the solar array system as well as the adequacy of the open web trusses to support the increase in load <br />from the solar panels. We do not take responsibility for any other portion of the solar array support system, any other <br />structural elements not contained within this letter, or the integrity of the structure as a whole. <br /> <br />Sincerely, <br />Eclipse Engineering, Inc. <br /> <br /> <br /> <br />Robert VanCamp, PE <br />Project Manager <br /> <br />Enclosed: Supporting Calculations 6.30.2020 <br />Digitally signed by Robert VanCamp, <br />PE <br />Location: Eclipse Engineering, PC <br />Contact Info: rvancamp@eeimt.com <br />Date: 2019.07.03 09:03:10-07'00' <br />20 114776 00 BP <br />3225 STATE STREET <br />City of Salem Building & Safety Division 20/35