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( ' <br /> March Id. 2010 <br /> l�ddition to Stccvcs Rcsidcncc <br /> I.&n Job No. 10-OOR <br /> Naec 14 <br /> • '1'hc minimum depth to bottom of perimctcr footings bclo�v adjaccnt tinal cxtcrior <br /> grade should be no Icss than 18 inches. 7�he minimutn depth to bottom of the <br /> interior liiotings below top of floor slab should be no Iess than 12 inches. <br /> • 'i'hc minimum �vidth shoulJ bc no Icss than 16 inchcs for continuous footings. and <br /> no lcys than 24 inchcs fiir individual footines. csccpt thosc footings supporting <br /> light-���cight porchcs and ���ood dcck. <br /> Footing foundations of thc cxisting housc to which the addition is to bc abuncd should <br /> havc thcir condition and sire checked out by a structural cnginecr. !f the size of cxistin, <br /> footing Ibundations, bascd on thc abovc rccommcndcd allu�vablc bcaring pressurc, is <br /> inadequate in supporting the new addition, the esisting footing sliould be enlarged or <br /> ���idcncd bascd on dcsigns b�� a structural eneinccr. <br /> n onc-third incrcasc in the abovc rccommcnded allowable soil bcaring pressures may be <br /> uscd whcn cunsidcring short-tcrm, transitory, wind or scismic loads. For footing <br /> 1'oundations dcsigncd and constructcd per rcconuncndations abovc, wc cstimatc that thc <br /> m,ixinuim total post-construction sctUcmcnt of the new addition and dcck should be 1/2 <br /> inch or Icss and Uic difl'crcntial sctticmcnt across �vidth of thc addition should be 3/8 inch <br /> or Irss. <br /> I.cucral loads on thc nc��� addition and dcck may n� ����St�a n�� thc triction f�rcc bctwcen <br /> the fi�undalions and the suberade soils or thc pussive earth prcssure acting on the belo�v- <br /> <�radc portion of thc ('oundations. For thc lattcr, thc foundations must bc poured "ncat" <br /> against undisturbcd soils or back�illed with a clean. trce-draining, compacted structural <br /> LIU & ASSOCIATES, INC. '�, /y�,">� <br />