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i • <br /> ' `r�GOD D��KS - SA��iPLE CALCULATIOPIS FOR USII�G THE SPAN TABLE <br /> a _ Gase I Solution: ReTer to table for joist and beam siZes. <br /> .1 <br /> Example: a = 12' , Post Spacing = 8' <br /> � . Refer to the span table. Joist size may be either. 2x8' s 72" O,C. <br /> or 2x10's 16" O.C. Beam size may be either 3-2x8'x or <br /> 2-2x10's. <br /> �dSE? II Solution: ' USe•��d�� FOT' �OISt 517.2 �fld ��d" + ��b�� t0 <br /> � a b determine beam size (The length or "b" is restricte.� by <br /> _�, _I . J both the ]ength of "a" and the size of the j oists) . <br /> i <br /> Example: a = 8' , b = 2' , Post Spacing = 10' <br /> � Find the joist size required by looking under 8' on the <br /> I table. Joist ler.gth is indicated as 2x6's 16" O.C. or <br /> � 2x8's 24" O.C. For sizing the beam, use a joist ieng�h o� <br /> E 10' (8' �- 2' = 10' ) and a pos� spacing of 10' . The tabl e <br /> , . indicates that 4-2x8 ' s or 3-2x10's are required for the bearr. <br /> Case III Solution: Use "a" or "b" , whichever is greater, to <br /> determine joist size. llse "a" + •"b" to dete.rmine the size <br /> of Bean No. 1 and use jois� length "b" to determine the <br /> a � � size or Beam-No. 2. - - •- <br /> � �xample: a 6' , b 7 ' , Post Spacing 9 ' <br /> The joist length (7 ' } is dete �� ined by the longest span joist <br /> ("b"). The table indicates that 2x6`s 16" Q.C. or 2z8 ' s 24" Q.C. <br /> zre required for a 7 ' span. For Bea:� No. 1 , use joist length <br /> 3�a� 1 Bean 2 of l3' (6' + 7 ' = 13 ' ) and pos� spacing of 9' . The table <br /> � indicates that 3-2x10's or 2-Zx]2's are required for Beam P�o. l . <br /> � For Beam No. 2 use joist length of 7' with a �post spaEing of <br /> 9'.� The table indicates that 4-2x6's or 3-Zx8's are <br /> required for Beam No. 2. -- <br /> • Case IV Solution: Use "a" or "b" , whichever is greater, to <br /> determine joist size. Use "a" + "b" to deternine the size <br /> of Beam No. 1 and "b" + "c" to determine the size of Beam "to. 2. <br /> � (The length .of "c" is restricted by both tt�e length of "b" <br /> and the size of the joist). � <br /> a b c � <br /> txample: a = 7' , b = 8' , c = 2' , Post Spacing = 12' <br /> - The longest joist span is 3 ' ; therefore, the table indicates <br /> that 2x6's 16" O.C, or 2x8's 24" O.C. are required. For <br /> No. 1 No. 2 Beam No. 1 , use jois� length oT 15' (7 ' f 8' = 15') and <br /> 3eam Beam post spacing of 12' . The table indicates that 3=2x72's are <br /> required for Beam No. 1 . For Beam t�o. 2, use joist length of <br /> . � 10' (8' + 2' = 10' ) and post spacing of 12' . The table <br /> . indicates that 3-Zx10's or 3-Zx72's ar.e required. for <br /> . Beam No. 2. • � � . <br /> t�OTES: Post size must be adequate to provide ful l •beam bearing, ie. ,��one-member� and � <br /> two-mefnber beams must be placed on a 4x4 post, three-member beams must be � <br /> placed on 4x6 or 6x6 posts, and four-member beams must be placed on 8x8 posts. <br /> Most of the Doxes in this tabl�e contain two optional means of .support. Wood.. <br /> menbers may be .increased above those indicated in the table, but in no event <br /> may lesser members be used. <br />