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' • � . <br /> ��t��� D�CKS - SA;�PLE CALCULATIO��S FOR USIr�G T;iE SPA�� TH�LE <br /> a C�se I Solution: Rerer to table for jcist and beam sizes . <br /> �xample: a = 12' , Post Spacing = 8' - <br /> P.efer to the span table. Joist size nay be e.ithe� 2x8' s 12" G.0 <br /> � or 2x10's 16" O,C. Beam size may be either 3-2x8'x o r <br /> 2-Zx10's. <br /> Case II Solution: Use -"a" �or joist size and "a" , "b" �o <br /> ideternine beam size (The length or "b" is restrict� by <br /> z ,,.►,� b f both the length or "a" and the size o� the joists) . <br /> �� I —� <br /> ; cx a�ple: a = 8' , b = 2' , Post Spacing = 10' <br /> � <br /> � rind the joist size required by looking under 8' on the <br /> � table. Joist ler.ath is irdiczted as 2x6' s i6" O.C. or <br /> 2x8's 24" O.C. For s� zir.g tne bean, use a jois� ieng�n o; <br /> � 10' (8' � 2` = 10' ) and a pos� soacing o` 10' . The ta bie <br /> � indicates that 4-2x8 ' s or 3-2x10' s ar2 required �or t�e bez��,. <br /> Case III Solution: Use "a" or "b" , whichever is gre�ter, to � <br /> dete �� ine jois� sizc. Us? "a" ; �"b" to deter,?1in2 the size <br /> o� Be�� P1o. 1 ard use joist lengtF� "b" to det�;,��ire the <br /> � � � b size o� Be�n h'o. Z. •. <br /> I �x�mple: �. = 6' , b = 7 ' , Post Spacirg = 9 ' <br /> i � <br /> � �+'" ihe joist length (7 ' } is det�i'^1Re� by �h? lonc_;� s�an jois� <br /> ` � b ) • T�`�e ta51e inGicates tnat 2x5 `s 1 "0" O.C. cr 2xo ' s 2�" C.0 <br /> J zre requi r`d for a 7 ' sp�n. r'o; 8��:,� P�c. 1 , us� �oi s� i enc�, <br /> ` 3�_..-� i 3e�n 2 ot 13 ' (6' 1 7 ' = 13 ' ) ard pes� spacing or" 9' . The �abla , <br /> ; ; indicates that 3-2x10' s cr 2-2x12's are reGuired TOr SeaR P�o . i . <br /> :or Se�� r{o. 2 �se joist length or 7' witn a �post s�aE�ng of <br /> ° ' . ihe table indicates that �-2x6's cr 3-Zx8'; are <br /> required fcr Be::�;� ho. 2. __ <br /> ' �cS2 TY Solution: Use `�Z�� Ot' `�b�� , Wf11Ch?V?T' 1S gre�t�t", �0 <br /> d��ernine j075i. SiZ?. �.�5� °c�� � ��b`� �0 deterr;ine tf'? S1Z� <br /> Ot 8edm H0, I cfla "v�� T ��C`� t0 GE�21"'i�17t1? i,he S1Z� OT �EZti1 �i0 . 2. <br /> ir,e len �n or "c" is restric�.. L y " " <br /> � 9y �d by botn �he 1 en;�h or b <br /> and the size of the joist) . �� <br /> a I b f c <br /> ( � c"xa„�ple: z = 7 ' , b = E ' , c = 2' , Post Spacing = 12 ' <br /> � . <br /> =� � ihe longest joist span is 2 ' ; therer'ore, the table irdicates <br /> � that 2x6's 16" O.C. or 2x�'s 24" O.C. are requir�d. �or <br /> y0• � �y0• 2 Bean t�o. 1 , use joist lergth or 15 ' (7 ' + 8 ' = 15') and <br /> �e�� ��eam post spacing o` 12' . The �able indicates th�t 3-2x12 ' s ar2 <br /> i required for Bez:�, No. l . �or 3eam tlo. Z, use joist length o� <br /> � l0` (8' � 2' = 10' ) and post spacing or 12' . The table <br /> . irdicates that 3-2x10's cr 3-2x12's ar.e required. for <br /> _ 6ezn Ho. 2. � . . <br /> �{OTES : Post size must be ade�uate to provide full �beam bearing, ie. , �one-member� ard <br /> two-manber beams rust be placed on a 4x4 post, three-member beans must be � <br /> place� on 4x6 or 6x6 posts, and four-menber beams must be p]aced` on 8x8 posts. <br /> Most of the boxes in tt�is tabl�e contain two optional means of .support. Wood.. <br /> manbers may be increased above those indicated in the table, but in no event <br /> nay ]esser members be used. <br />