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. �. ' . <br /> ' � ���'�0� D�.��KS - SAI�PLE CALCULATIOFIS FOR USI1;G THE SPAN iABLE <br /> a —� C�se I Solution: Rerer to taole for jcist and beam sizes . <br /> � Example: a = 12' , Post Spacing = 8' <br /> P,efer to the span table. Joist size nay be either. 2x8` s 12" O.C. <br /> or 2x10's 16" O,C. Beam size may be either 3-2x8'x or <br /> � 2-2x10's. <br /> Case Ii Solution: Use ."a" �or jois� si�� and "a" T "b" <br /> to <br /> � —� b deternine beam size (The iength or" °b" is restricte-� by <br /> ! 4 '��J both the 1 eng th of "a" ar,d the s i ze or" the j o i s ts) . <br /> I � <br /> � cx�:-�ple: a = 8' , b = 2' , Post Sp�cing = 10' <br /> , rind the joist size reyuired �y �GO{cl�G under 8' on the <br /> I table. Joist ler.ath is indicated as 2x6' s l6" O.C. or <br /> j Zx2's 24" O.C. ror sizir,y tne bear, use a joist iength o� <br /> ; 10' (8' � 2` = 10' ) ard a pos� spacing o` 10' . The ta ble <br /> . indicates that 4-2x8 ' s cr 3-2x10' s are required for tne bear�. <br /> Case III Solutior: Use "a" or "b" , whichever is oreater, �o <br /> deterrnine jois� S1ZE. ��Sc ��d�� * •��5�� �0 dete�ine th� 51Ze <br /> �� Bea,� �ao. 1 ard use jois� ieryth "o" to det�rnine the <br /> i � � size or" Beam No. 2. • <br /> �-- ��---r-� _ <br /> � �xample: � - 6' , b = 7 ' , Post Spacing = 9 , <br /> , � . <br /> ( ' The joist length (7 ' ) is d2tF ,,,ined hy the loroest suan joist <br /> ("b") . The table indicates tn�t 2x5's 16" O.C, or 2xo ' s 24" Q.C. <br /> i zre required for a 7 ' sp�n. For B��:�� No. 1 , use ;;oist ieneth <br /> ` 3e�:;� i Rean 2 - <br /> o` 13 ' (6` L 7 ' = 13 ' ) ar,d pos� spac�ng of 9' , ihe tahle <br /> i zndicates that 3-2x10' s cr 2-2x12's are required for 5eam P;o. l . <br /> For Be�� iio. Z use joist length of 7 ` with a post swaEing of <br /> 9 ' . The table indicates tF,at 4-2x6's or 3-Zx8's are <br /> required for Beam ho. 2. -- <br /> � Case IV Solution: Use "z" or "b" , wnichever is greater , to <br /> de�ermine �O15t SiZ?. �S� '�c�� T ��b° �Q determine tf�E' S1Z� <br /> of Beam Ko. 1 and "b" T "c" to Geternine the size of Bezm �+o . 2. <br /> (Tne leng�n of °c" is restricted by betn the ler,gth of "b" <br /> an� the size of the jois:) . � <br /> a b I c <br /> I txample: a = 7' , b = 8 ' , c = %` , Post Spacing = 12 ' <br /> � - . _ . <br /> - The longest joist span is 2 ' ; �herer"ore, the table indicates <br /> that ?�c5's 16" O.C. or 2x8's 24" O.C. are required. For <br /> � No. 7 No. 2 Beam Ho. 1 , use jois� lergth oT 15' (7 ' � 8' = 15' ) and <br /> 3eam Beam post spacing o` 12' . The �able indicates that 3-2x12 ' s are <br /> required for Eeam �,o. l . ror 3eam t�o. 2, use joist length of <br /> . � 70` (8' + 2' = 10' ) and post spacing of 12' . The table <br /> . �ndicates that 3-Zx10's cr 3-2x12's ar.e required, for <br /> . Beam Ho. 2. � . <br /> t�OTES : Post size must be adequate to provide full beam bearing, ie. , �one-member� and <br /> two-m enber beams r�ust be placed on a 4x4 post, three-member beams must be <br /> placed on 4x6 or 6x6 posts, and four-meriber beams must be p)aced on Sx8 posts. <br /> Most of the boxes in this tabl�e contain two optional means of .support. �tood.. <br /> mgnbers may be increased above those indicated in the table, bu� in no event <br /> mav lesser members be used. <br />