6200 12TH DR SE 2020-08-28 - Laserfiche WebLink

• August 20,2018 Evan Manderbachsale A& R Solar 3211 MLK Jr Way S, Suite B Seattle,WA 98144 Subject: Structural Engineering Evaluation of Solar Panel installation Project: Everett Safe Streets Supportive Housing 6200 12th Drive SE Everett,WA 98203 Dear Evan: I have completed my evaluation of the solar installation for the referenced project in Everett,WA, and have the following findings and recommendations, The structure on which the panels will be installed is a new building currently under construction. The building is a multistory wood framed building with gang nailed roof trusses and l6 inch plywood roof sheathing. The roofing is AEP 22 Span Seam standing seam metal roofing. The majority of the roof will be covered with solar panels. The panels will be attached to XRIO rails that are anchored to the standing seam roofing with S-5!1;clamps spaced 48"on center. The building has been designed for an additional 5 psf included in the vertical and lateral calcula- tions so the vertical and lateral framing systems are adequate for the solar panels loads. I calculated the maximum vertical load that the XRIO rails will need to carry and found that the rails are within accepta ble stress limits with these loads. I also calculated wind uplift forces for the anchors and found that the anchors are adequate for the wind uplift forces in all areas of the roof. I also checked to see that the attachment of the roofing panels to the plywood deck we adequate to resist the uplift loads due to the wind forces on the panels. I found that the attachment of the roof panels to the plywood sheathing was adequate to resist the wind uplift forces from the solar panels. I also conducted a review of the overall wind and seismic loading for the building itself and found that the wind load for the structure will not be increased by the addition or the solar panels and that the increase in the seismic loading was accounted for in the original design ()law building . Based upon my understanding of the system and the calculations I have performed. it is my opin- ion that the solar system installed as outlined above and as shown in your submittal to me is in general conformance to the 2015 IBC and will adequately resist vertical loading due to dead loads and snow loads and lateral loading due to wind and seismic forces. Please let me know it'you have any questions or need anything further. 1 appreciate this opportun ity to provide you with these engineering services. , 2 ar 0 ,i(s Sincerely, wit. Clary E. Gill, SE s'E * • . / .gr 9 Clary E. Gill, SE1125 NE I52"'l Street I EYPIRE3710-'n—Fi (206)992-2728 Shoreline, WA 98155