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0 <br />SolarMount Unirac Coie-Compliant Installation Manual :F UN! RAC <br />Part I. Procedure to Determine the Design Wind Load <br />[1.1.] Using the Simplified Method - ASCE 7-05 <br />The procedure to determine Design Wind Load is specified <br />by the American Society of Civil Engineers and referenced in <br />the international Building Code 2009. For purposesof this <br />document, the values, equations and procedures used in this <br />document reference ASCE 7-05, Minimum Design Loads for <br />Buildings and Other Struct:ures. Please refer to ASCE 7-05 (f <br />you have any questions about the definitions orprocedures <br />presented in this manual. Unirac uses Method 1, the <br />Siniplified Method, for calculating the Design Wind Load for <br />pressures on components and cladding in this document. <br />The method described in thisddcument is valid for tlush, no <br />tilt, SolarMount Series applications on either roofs or walls. <br />Flush is defined as panels parallel to the surface (or with no <br />more than 3" difference between ends of assembly) with no <br />more than 10"space betw.een the roo f surface, and the bottom <br />of the PV panels. <br />This method is not approved for open;structure calculations. <br />-- Applications of these procedures is subject to the following <br />ASCE 7-05 limitations: <br />1, The buildihg height must be less than 60 feet, h < 60. See <br />note for determining h in the next section. For instill lations <br />on structures gfeacer than 60 feet, contact your local Unirac <br />Distributor. <br />2. The building must be enclosed, not an open or partiallyr <br />enclosed structure, for example a carport. <br />3. The buildingis regular shaped with ho unusual geometrical <br />:irregilly, fity in <patial forth, for exa,mple a geodesic dome. <br />4. The building is not in an extreme geographic location such <br />as a narrow canyon or steep cliff. <br />5. The building has a flat orgable reefwith a pitch less than 45 <br />degrees or a hip roof with a pitch less than 27 degrees. <br />6. lf your installation does not conform to these requirements <br />please contact your local Unirac distributor or a local <br />professional engineer. <br />If your installation is outside the United States or does not <br />meet all of these limitations, consult a local pro fessional <br />engineer oryour local building authority. Consult ASCE 7-05 <br />formore clarification on the use of Method 1. Lowerdesign <br />wind loads may be obt:ained by applying Method II from ASCE <br />7-05. Consult with a licensed engineer jf you want to use <br />Method II procedures. <br />The equation for determining the Design Wind Load for <br />components and cladding is: <br />pnet (psj) = AKzd pnet3O <br />Fnet·040 = Design WindLoad <br />A = adjustment-factorfor building height and exposure category <br />K.: = Topographic Factor at mean roof height, h (ft) <br />1 = Importance Factor <br />pnetso (ps.19 = net design wind pressurefor Exposure B, at height <br />=30*41= 1.0 <br />You will also need to know the following information: <br />Basic Wind Speed· = 17 Imph), the largest 3 second gust ofwind in <br />the last 50years. <br />h Ok) = total roof heightforflat roof buildings or mean roof <br />height.forpitched roof buildings <br />Roof Pitch (degrees) <br />This manual will help you determine: <br />1*ective WindArea (€f) = minimum total continuous area of <br />mudul# beifty installed (Siep 2) <br />RoofZone = the area of the roofyou are installing the pv:system <br />according to Step 3 <br />RoofZone Dimension = a (ft) (Step 3) <br />Exposiire Category (Step 6) <br />[1.2.] Procedureto- Galculitteffutal-Debiall Wind <br />The procedure for determining the Design Wind Load can be <br />broken into steps that include looking up several values in <br />different tables. Table 5 has been provided as a wofksheet for <br />thefo-llowing.9-steps (p age 8) <br />Step 1: Determine Basic Wind Speed, V (mph) <br />Determine the Basic Wind Speed. V (inph) by cotisulting your <br />local building departrhent or loca®$ your installation on the <br />:maps in Figure 1, page 4. <br />Step 2: Determining EJYective WindArea <br />Determine the smallest area of continuous modules you will <br />beinstalling. This isi:he smallescarea tributary (contributing <br />load) to u support or to a simple-span of rail. That aren is the <br />- -Effective-Wind*rea-, the total area of the fewest number of - - <br />modules on a run of rails. if Ihesmallest area of continuous <br />modules exceeds 100 sq ft, ilse 100 sq ft (See Table 2). If less, <br />round down m values available in Table 2. <br />e <br />4/' <br />paE, <br />3 <br />-1 1