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SolarMount Unirac Code-Compliant Instanation Manual :FUNI RAC <br />Step 3: Determine RoofZone (continued) <br />Using RoofZone Dimension Length, a, determine the roof zone <br />locations according to your roof type, gable, hip or monoslope. <br />Determine in which roof zone your pv system is located, Zone <br />1, 2, or 3 according to Figure 2. <br />Figure 2. Enclosed buildings, waU and roofs <br />Flat Roof /5 Hip Roof (7° <0£ 27°1,5 r« <br />4 <br />h <br />h <br />\? tk <br />0<nx . <br />Gable Roof (05 7°) ,g:=P- -Gable Roof (7° <06 45°)L <br />-a <br />204, <br />Interior Zones End Zones <br />Roofs - Zone I /Walls - Zone 4 | |Roofs - Zone 2/Walls - Zone 5 Roofs - Zone 3 Corner Zones <br />Source: ASCUSE! 7-05, Minimum Design Loads for Buildings and Other Structures, Chapter 6, p. 41. <br />Step 4: DetermineNetDesign WindPressura Pnet,O (p€D <br />Using the 1Wkctive Wind Area (Step 2), Roo/Zone Location <br />(Step 3), and Basic Wind Speed (Step 1), look up the <br />appropriate Net Design Wind Pressure in Table 2, page 6. Use <br />the E#ective WindArea value in the table which is smaller than <br />the value calculated in Step 2. If the installation is located on a <br />roof overhang, use Table 3, page 7. <br />Both downforce and uplift pressures must be considered <br />in overall design. Refer to Section II, Step 1 for applying <br />downforce and uplift pressures. Positive values are acting <br />toward the surface. Negative values are acting away from the <br />surface.