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:1' UNIRAC Unirac Code-Compliant. Installation Manual SolarMount <br />Step 4: Select Rail Type <br />Selecting a span and rail type a ffects the price of yollt <br />installation. Longer spans produce fewer wall or roof <br />penerrations. However, longer spans create higher point load <br />forces on the building structure. A point load force is the <br />amount of force transferred to the building structure at each <br />connection. <br />It is the installer's responsibilitv to verifv that the building <br />structure is strong enough to support the point load <br />forces. <br />Table 10. Downforce Point Load Calculation <br />Total Design Load (downforce) (max of case 1,2 or 3): P <br />MuJule le,ladi-pw, pelidiculal· to ldilb, O <br />Rail Span:L <br />Downforce Point Load: R <br />Step 5: Determine the Downforce Point Load, R Obs) <br />at each connection based on rail span <br />When designing the Utiirac Flush Mount Installation, you <br />must consid er the downfcirce Point Load, R (lbs) on the roof <br />stfucture. <br />The Downforce, Point Load, R Obs), is determined by <br />multiplying the 7btal Design. Load, P (p.to (Step 1) by the Rail <br />Span, L (fo (Step 3) and the Module Length Perpendicular to <br />the Rails, B (A·) divided by two. <br />R abs)= PLB/2 <br />R = Point Load (lbs) <br />P = Total iDesign Load (plf? <br />L = Rail Span (ft) <br />B = Modulf Length Perpendicular to Rails (fo <br />It is the installer's responsibility to verify:that the building <br />structure is strong enough to support the maximum point <br />loads calculated according to Step 5. <br />psf Step I <br />A fl <br />x ft Step 4 <br />12 <br />lbs <br />11 <br />Page <br />12 <br />1 1 1J