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Carl Putnam P.E. <br />3441 Ivylink Place <br />Lynchburg, VA 24503 <br />January 6, 2014 <br />Val Jacklin <br />Metals; Building Products <br />64·50 Caballero Blvd <br />Buena Park, CA <br />Dear Val: <br />r <br />This letter is in resp0nse to your question about Metals USA's ICC ESR 1953 approved <br />under the 20091BC and how it can be applied to the new 2012 IBC and 2013 CBC. <br />The major change to the 2012 IBC is it uses ultimate design wind speed (The 2012 <br />IRC/2013 CRC) continues to use"3 second Gust" wind speeds). The 2000-2009 IBC LM <br />"3 second gust" wind speeds.- 2012 IBC Table 1609.3.1 shows the conversion betweeri <br />two types. The equation this table is based on is: t <br />\6 s = Vuit x 0.775 <br />For an area that has adopted an ultimate design wind speed this is equivalent to: <br />Vis = 110 mph x 0.775 = 85 mph >> use 85 mph <br />\As = 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 />\6 s = 140 mph x 0.775 = 109 mph >> use 110 mph <br />ARCHED <br />499©Facyl. M <br />This 904 04 pians ae <br />1 ati times and I <br />iteraeong on sart <br />CiI, of Santa Ana. <br />provisions of ANY <br />Accepted By - <br />I have reviewed the 2012 IBC/2013 CBC and the additiohal reference documents (2010 <br />Aluminum Design Manual, ACI-318-08 etc) and have determined the patio cover, carportand commercial structure designs in the ICC ESR approved under the 20091BC are LBatelssuedZ <br />sufficient to meet the 2012 IBC. Areas using an ultimate design wind speed of 115 mph i <br />should use the 90 mph tables other areas should use the wind speed conversion shown ' <br />above. Residential projects can continue to use the wind speeds as shown on the 2009 ICC <br />ESR. <br />I have submitted an update to the 2012 IBC for ]CC ESR 1953 and since I have had two <br />similar plans approved, l expect approval to happen quickly. If you require further <br />information please contact me at (434) 384-2514 or at carlputnamacomcast. net. <br />Sincerely, <br />Carl Putnam. P.E.I i A 7 1 i 16 <br />C/VI' <br />OFCAU. <br />0 0 0 <br />JAN 06 2014 <br />, <br />Ca, i Putnam, P. E.