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:FUNIRAC Unirac=Code-Compliant Installation Manual SolarMount <br />Step 4: Select Rail Type <br />Selecting a span and rail type affects the price of your <br />nstallation. Longer spans produce fewer wall or roof <br />oenetrations, However, longer spans create higher point load <br />forces on the building structure. A point load force is the <br />unount of force transferred to the building structure at each <br />zonnection. <br />[t is the installer's responsibilitv to verify that the building <br />itructure is strong enough to support the p0int load <br />·orces. <br />rable 10. Downforce Point Load Calculation <br />rotal Design Load (downforce) (max of case 1,2or 3): P <br />lodule length perpendicular to rails: B <br />tail Span: L <br />Downforce Point Load: R <br />Step 5: Deterrnine the Downforce PointLoad, R Obs), <br />at each connection based on rail span <br />When designing the Uilirac Flush Mount Installation, you <br />must consider the downforce Point Load, R Cbs) on the roof <br />structure. <br />The Downforce, Point Load, R (lbs), is det:drmined by <br />multiplying the 7btul Design Load, P (psj)(Step 1) by the Rail <br />Span, L (ft) (Step 3) and the Module Length Perpendicular to <br />the Raib, B (ft) divided by two. <br />R (lbs) = PLB/2 <br />R = Point Load (lbs) <br />P = Total Design L'oad (psj) <br />L = Rail Span (ft) <br />8 - Module Length Perpendicular to Rails (fe <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 />X ft <br />x ft Step 4 <br />11 <br />lbs <br />1 <br />-- <br />- <br />31 <br />0 <br />r'C. <br />12