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29.4.3 Rooftop Solar Panels for Buildings of All Heights with Flat Roofs or Gable or Hip Roofs with Slopes Less Than 7°. <br />h = 15 ft mean roof height above ground, in ft <br />h1 =1 ft Solar Panel Height above roof at low edge, in ft <br />h2 =1.5 ft Solar Panel Height above roof at raised edge, in ft <br />hpt =0 ft Mean parapet height above adjacent roof surface, in ft <br />A = 5.22 sf <br />Effective Wind area for structural element being designed, in ft2 <br />a = 30 ft Distance to measure roof zones <br />d1 = <br />d2 = <br />E =1.5 <br />d1 to the adjacent array > max(4h2, 4 ft), or d2 to the next adjacent panel > max(4h2, 4ft) <br />W L =60 ft Width of overall longest side, in ft <br />W S =50 ft Width of overall shortest side, in ft <br />GCrn= Net pressure coefficient, equal topE((GCrn)nom(c)) <br />(GCrn)nom=Nominal Net pressure coefficient <br />lp =3.25 ft Chord length of solar panel, in ft perpendicular to edge <br />lmodule =4 Module chord length (trib W) <br />W module 2.705 Module length (1/2 panel) <br />c 0.8 Panel chord length factor, max(0.6+0.06lp,0.8) <br />For 5o <br /> <  < 15o, apply c only to 15o - 35o (GCrn)nom figure values and prior to interpoating <br />p 0.9 Parapet height factor, equal to min(1.2,0.9+hpt/h) <br />5 Angle of plane of roof from horizontal, in degrees <br />0 Angle of plane of panel to roof, in degrees <br />Determine Lb <br />Lb= 0.5*sqrt(hWL), but need not exceed h or Ws, in ft <br />Lb=15.0 ft, not to exceed 15 or 50 ft <br />Lb=15.0 ft <br />Determine Roof Zones <br />2h 30 ft: Roof zone 2 and 3 setback (indicated by the dotted lines on Figure 3) <br />Panels located beyond 30 ft setback are located in Roof Zone 1. <br />Effective Wind Area (A) of attachment or ballast: <br />A = lmodule*W module =4 ft x 2.705 ft <br />A = 8.79 sf <br />Calculate the Normalized Wind Area (An) <br />An = (1000/(max(Lb, 15ft))2)*A =(1000/(15ft)^2)*8.79 sf <br />An =39.07 sf <br />ASCE 7-16 <br />For rooftop solar array, horizontal distance orthogonal to the panel edge to an adjacent panel or <br />the building edge, ignoring any rooftop equipment in Fig. 29.4-7, in ft <br />For rooftop solar arrays, horizontal distance from the edge of one panel to the nearest edge in <br />the next row in Fig. 29.4-7, in ft <br />1.5 for uplift loads on panels that are exposed and within a distance 1.5Lp from the <br />end of a row at an exposed edge of the array; E =1.0 elsewhere for uplift loads and <br />for all downward loads, as illustrated in Fig. 29.4-7. A panel is defined as exposed if <br />d1 to the roof edge > 0.5h and one of the following applies: <br />1422 W Marion <br />Way1/24/2025