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. <br />£:UNIRAC Unirac Code-Compliant Installation Manual SolarMount <br />Step 7: Determine adjustmentfactorfoP height and exposure <br />category, A <br />Using the Exposure Category (Step 6) and the roof heiglit, <br />h (fc.), look up the adjustmentfuctorfor height· and exposure in <br />Table 4. <br />Table 4. Adjustment Factor (A) for Roof Height & <br />Exposure Category <br />E*rosure <br />Mach 4 05 C <br />Step 8: Determine the Importance Factor, I <br />Determine if the installation is in a hurricane prone region. <br />Look up the Jmportance Factor. 1, Table 6, page 9, using the <br />occupancy;category description and the hurricane prone <br />region statils. <br />Step 9: Calculate the Design Wind Load, Pnet (psf) <br />Multiply the Ner Design WindPressure, pne,30 (psf) (Step 4) by <br />the adiustmentfactorfor height and exposure, A (Step 7),the <br />7bpographic Factor, Koi (Step 5), and the Import.·once Factor, I <br />(Step 8) using the followihg equation, or Table 5 Worksheet. <br />15 1.00 1 :21 1.47 <br />20 1.60 1.29 1.55 <br />25 1.00 135 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 1.81 <br />55 1.19 1.59 1.84 <br />60 1.22 1.62 1.87 <br />Source: ASCBSEI 7-05, Minimum Design Loads for Buildings and Other <br />Suuctures, Chapter 6, Agure 6-3, p. 4.4. <br />pnet (PED = AKzd p.nht3O <br />pnet (PSD = Design Wind Load (10 psfminimum) <br />A = adjusementfactorfor height and exposure category (Step 7) <br />Kzt = Topographic Factor at mean roof height, h (fe (Step 5) <br />I = Importance Factor (Step 8) <br />pnet,O 0,30 = net design wind pressureforErposure B, at height <br />== 30, I=1 (Step 4) <br />1-ke Tahle S hplnw tn rale latp Defign Winrl T.n,rl <br />The Design Wind Load will be used in Part II to select the <br />appropriate SblarMount Series rail, rail span and foot spacing. <br />In Part II, use both the positive (downforce) and the negative <br />(uplift) results from this calcularion. <br />Table 5.Worksheet for Components and CladdingWind Load Calculation: IBC 2009,ASCE 7-05 <br />2,/ighle Dev@rion Symbo#Value Ullit St* <br />BilildiriffleiN· 2.-1 -7 <br />Building, Least Horizontal Dimension ft <br />Rnof-Pitch -- <br />Exposure Category o <br />B>sk Wi693Ii.*d ·, 2 yi E -66" V .- -r- -Alh: ...1 1 1._-fo_- <br />[ffULiV<VVWJ ,u -u :fA <br />Reference <br />i --Fium.1--1 <br />2 <br />Roof Z86@-Sit*dk L€ngtl·i < ..·a ft Tabl¢ 11 <br />Roof Zone Location 3 Figure 2 <br />Net Design Wind Pressote DneeD psf 4 Table 233' <br />Topographic Factor KE x 5 <br />Adjustment factor for height and exposure category A x - 7 -d61€4 <br />Importance Factor 7-x 8 -Tabl&-5 <br />Total Design Wind Load 1?net Plf 9 <br />, <br />4