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Carl Putnam P.E. <br />3441 Ivylink Place <br />. Lynchburg, VA 24503 <br />. <br />Carl_Putnam,_12.E. <br />January 9, 2014 <br />Wayne Housely <br />Metals Building Products <br />4601 E Cheyenne Ave <br />Las Vegas, NV <br />Dear Wayne: <br />This letter is in response to your question about Metals USA'slICC ESR 1953 approved <br />under the 2009 IBC and how it can be applied to the new 2012 IBC... <br />Thi major change to the.2012 IBC is it uses ultimate.design wind-speed=01-he 2012-IRC <br />continues to-use."3 second Gust" wind speeds). The 2000-2009 IBC used 33 second.gust'V <br />windspeeds.. The 2012.IBC Table 1609.3.1 shows.the conversion between the two types. <br />The equation this table is based on is: <br />\6 s = Vuit x 0.775 <br />For an area that has adopted these ultimate design wind speeds the equivalent in the 2009 <br />re'rt is: <br />V3 S = 115 mph x 0.775 = 89 mph >> use 90 mph <br />\As = 120 mph x 0.775 = 93 mph >> use 95 mph <br />\As = 130 mph x 0.775 = 101 mph >> use 100 mph <br />V3 S = 140 mph x 0.775 = 109 mph >> use 110 mph <br />I have reviewed the·2012 IBC and,the additional reference documents (2010 Aluminum <br />t Design Manual, ACI-318-08 etc) and have determined the patio cover, carport and <br />commercial structure designs in the ICC ESR approved under the 20091BC are sufficient to <br />meet the 2012 IBC. Residential projects can continue to use the wind speeds as shown on <br />the 2009 ICC ESR. <br />I I have submitted 2012 IBC version of ICC ESR.1953 to.ICOES.and they are currently <br />reviewing them. I have received approval on very similar plans already so I expect these to <br />be approved quickly. If you require further information please contact me at (434) 384-2514 <br />or at carlputnam@comcast.net. <br />Sincerely, <br />1WN'tPpp. 2/3/2,0 <br />Carl Putnam, P.E. <br />Wknoc*#341 <br />..... <br />JAN 09 2014