1118 80TH ST SW BASE FILE 2019-12-11

!WM 1235 EAST 4TH AVE SUITE 101 : MI 1111111111.111111111111OLYMPIA,WA 98506 MI MI IMMUNE MMINI (360)754-9339 FAX(360)352-2044 NICSQUARED E-mail:eng©mc2-inc.com I N C O R P O B AT E I) October 3, 2018 Single Ply Systems Inc. 10951 Nesbitt Ave S Bloomington, MN 55437 Attn: Mr. Leroy Swanson RE: Re-Roofing at Everett Pepsi Plant, 1118 80`h Street SW, Everett, Washington Dear Leroy: It is your intention to re-roof the existing metal warehouse building with new rigid insulation and a new layer of 60 mil waterproof membrane. The insulation consists of Johns Mansville Flat & Tapered ENRGY3, a layer of Johns Mansville Flat & Tapered ENRGY3 CGF, and the final weather layer of 60 mil thickness Johns Mansville white TPO roofing membrane. The new material weighs 1 pound per square foot (psf). The original metal building roof system was more than likely designed for a dead load of approximately 4 psf, with a 25 psf design snow load. The additional 1 psf will increase the load on the roof by 3.4% which is structurally acceptable. There are twelve existing skylights/smoke vents on the roof that will have their plastic domes replaced with new ones. There will be twenty eight new skylights added to the roof per the attached plan. The new skylights will not adversely affect the lateral capacity of the building. In a metal building the lateral loads are resisted by the building frames spaced about 25' apart. The loads come out of the roof metal sheathing through the purlins attached to the frames. With a 195' wide building with an eave height of approximately 25' a building frame would resist about 17 psf of wind load for a load to a frame of about 6,800 pounds per side. The shear stress in the sheathing/purlins would be 35 pounds per linear foot (plf). The capacity of the metal skins is about 75 plf. STIlt:cTintnl.• FoI;NDaIoy • CIVIL ENGINEERS