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:1:UNIRAC Unirac Code-Compliant Installation Manual SolarMount <br />Step 7: Determine adjustmentfactorfor height and <br />exposure category, A <br />Using the Exposure Category (Step 6) and the roofheight <br />h 04 look up the adjustmentjactorfbr height and exposure in <br />Table 4. <br />Table 4. Adjustment Factor (A) for Roof Height & <br />Exposure Category <br />Eqosure <br />Mean roof- <br />he#ght (10 8 CD <br />Step 8: Determine the Importance Factor, I <br />Determine if the installation is in a hurricane prone region. <br />Look up the Imponance Factor I, Table 6, page 9, using the <br />occupancy category description and the hurricane prone <br />region status. <br />Step 9: Calculate the Design Wind Load, pnet (psO <br />Multiply the Net Design Wind PresSure, pne:30 (psf) (Step 4) by <br />the adjustmentfactorfor height and exposure, X (Step 7),the <br />Topographic Factor, K.(Step 5), andthe Importance Factor, I <br />(Step 8) using the following equation, or Table 5 Worksheet. <br />15 1.00 1.21 1.47 <br />20 1.00 1.29 1.55 <br />25 1.00 1.35 1.61 <br />30 1.00 1.40 1.66 <br />35 1.05 1.45 1.70 <br />40 1.09 1.49 1.74 <br />45 1.12 1.53 1.78 <br />50 1.16 1.56 ..VI <br />55 1.19 1.59 1.84 <br />60 1.22 1.62 1.87 <br />Source. ASCEISB 7-05, Minimum Design Loads for Buildings and Other <br />Structures, Cliopter 6, Figure 6-3, p. 44. <br />pnet (PSD = XI<zd pnet30 <br />pnet (PSD = Design Wind Load (10 psf minimum) <br />A = adjustmentfactorfor height and exposure category (Step 7) <br />Kzt = Topographic Factor at mean roofheight h OV (Step 5) <br />I = Importance Factor (Step 8) <br />Fnet30(psf) = net designwindpressurefor Exposure B, at height = <br />30,1-1 (Step 4) <br />Use Table 5 below to calculate Design Wind Load. <br />The Design Wind Load will be used in Part II to select the <br />appropriate SolarMount Series rail, rail span and foot spacing. <br />In Part II, use both the positive (downforce) and the negative <br />(uplift) results from this calculation. <br />Table 5.Worksheet for Components and CladdingWind Load Calculation: IBC 2009,ASCE 7-05 <br />W...hir Ar¥·rr#,th, <br />#*12*70#*111 <br />Building, Least Horizontal Dimension <br />[REof-PliZh <br />Exposure Category <br />#212*imISEE63 <br />Effective Wind Area <br />Value Unit Step Retbrence <br />h lf- ' · --; "' <br />ft <br />degrees I <br />6 <br />V mph I Figure.1 23 <br />sf <br />2 <br />REofloiR'R@WRK !37*h a ft 3 Tablel --1 <br />Roof Zone Location 3 Figure 2 <br />N@F DaiEWidd Pressure _Pnet30 Pst 4 lable-£El <br />Topographic Factor Kzt x 5 <br />Adjustment factor-forheight_andexposung*egery__.3 x 7 1*e-4 <br />Importance Factor I x 8 Table 5 <br />To-El_DER@ii WiRd LERI #net psf 9 1 <br />0