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� , 7 <br /> . . 1 <br /> Roof Rafter Check Roof Rafters <br /> Robb Residence <br /> Worst case at the Rafters with the lag screws as point loads <br /> Wsnow�= 42psf Length = 11.75ft <br /> Wind Load calc: PV_lenght:= 65in PV_width := 39in <br /> Paway�- -17.ipsf PToward �- 6.6psf <br /> wwind_zonel �= Paway+ PToward =-10.5•psf Assumed min PSF of 10 psf <br /> According to ASCE 7-10 <br /> Lr:= lOpsf D:= 7pif Wwind netl�= 10.Spsf <br /> L�:_ �0.5Wsnow+ �Wwind_neti��'Leff = 42•plf <br /> w:= 1.2D + L�= 50.4•plf <br /> Tributary Area per Attachment Bolt= Number of Panels in a row x panel area/ Number of bolts <br /> Panels:= 16 Nobolts�- 1'Z8- 2$ Assumed 1 bolt per Attachment <br /> Area_panel:= PV_lenght•PV_width = 17.604•ft2 <br /> Area �Panels•Area_panel) 2 <br /> Trib�- = 10.06•ft FS:= 1.5 <br /> Nobolts <br /> Loadbolt_zonel �- FS'Wwind netl'AreaTrib = 158.438•Ibf <br /> Assuming min 28 point of loading per PV Array and the entire array is place in Zone 1 <br /> Spacing2:= 48in Max spacing set for attachments <br /> Sheet 15 <br />