Laserfiche WebLink
�� ` '"��D D�C!;S - SA(�PLE CALCULATIO�IS FOR USI ��� iHE SPA�J TABLE <br /> ' ri�J� <br /> d — I G�se I Solution: ReTer to taole for jcist and beam sizes . <br /> �j <br /> � �xample: a = 12' , Post Spacing = 8' <br /> P.efer to the span table. Joist size may be either 2xE' s 12" G.C. <br /> or 2x10's i6" O.C. Beam size may be either 3-2x8'x or <br /> � 2-2x10's. <br /> CdS2 TI Solution: Use .".a." i01" ,JOISi. SIZP dfld "d" T ��D�� i.0 <br /> ideternine beam size (The lengtn cf "b" is restricted by <br /> ,.� � �� b � both the length o` "a" and th2 size o� the joists) . <br /> I <br /> � cxample: a = 8' , b = 2' , Fost Sp�cing = 10' <br /> irind the joist size required by iooking under 8 ' on ihe <br /> I table. Joist ler.ath is indicated as 2x6' s 16" O.C. or <br /> � Zx2's 24" O.C. �or sizirg tne bear, use a jois� ieng�h o� <br /> ; 10' (8' �- 2` = 10' ) and a ;�os� S�dC1114 c� 10' . The tabl e <br /> indicates that 4-2x8 ' s cr 3-2x10' s are required `ar �,�;e bear��. <br /> Case III Solution: Use "a" or "b" , whic�ever is oreater, to <br /> dete ulfle �O1S� S �LG. USE ��d�� T ���S�� �0 dete!--;ine th� S1Z2 <br /> o� Be�� t�o. 1 ar,d use joi;� � er�th "�" to det�r;�ine the <br /> � size o� Beam �r'o. 2. • <br /> -- � �`- " I <br /> � I � ^ <br /> �xample: a = 6' , b = 7 ' , Post Spacing = 9 ` <br /> i <br /> � z ihe joist length (7 ' ) is deterired by '!�e longes� span joist <br /> � ("b" ) . The tzble incicates t�ay 2xo's 16" C.C. or 2xo ' s 2�" C.�. <br /> zr-e requir2d �or a 7 ' sp�n, ror E�c:�� Pio . 1 , use �ois� ienci,h <br /> 3e�:;� i 5e�n 2 - _ . <br /> ot 13 ' (6` + 7 ' - 13 ' ) ard pes� spactng of 9' . The tabla <br /> � ; indicates that 3-2x10's or 2-2x12's are reGuired ror 8ean ��o. i . <br /> �or Be�,� No. 2 use joist leng�h ot 7' w�th a post swaE�ng of <br /> 9 ' . The table indicat2s tF�at 4-2x6's or 3-2x8's are <br /> required for Bean ho. 2. -- <br /> � C�se ?V �olution: Use "?" or "b" , wnichever is greater , to <br /> de�ermine joist s�z�. Us� "a" � "b° to deter,:,ine t�e size <br /> of Beam ho, i and "b" + °c° to deter�ine the size or Bezm "+o . 2. <br /> (Tne length o` "c" is restricted by bot7 th,e lergth of "b" <br /> and the size of the jois:) . � <br /> a I b I c <br /> � � � �xample: a = 7 ' , b = 8 ' , c = 2' , °ost Spacir,g = 12 ' <br /> i � . <br /> - �he 7ongest joist span is 2 ' ; therefore, the table indicates <br /> that 2x6's 16" O.C, or 2x3's 24" O.C. are required. For <br /> � r(o. 1 No. 2 Beam No. 1 , use joist lergth or 15' (7 ' + 8' = 15' ) ard <br /> 3eam Beam post spacing o` 12' . The tab]e indicates thzt 3-2x12 's are <br /> required for Beam t;o. l . ror Beam tlo. Z, use joist length of <br /> . � ]0' (8' � 2' = 10' ) and post spacing of 12' . The table <br /> _ irdicates that 3-2x10's cr 3-2x72's ar.e required, for <br /> . Beam tlo. 2. <br /> HOTES : Post size must be ade�uate to provide full beam bearing , ie. , �one-member and <br /> two-m enber beams must be placed on a 4x4 post, three-member beams must be <br /> placed on 4x6 or 6xb posts, and four-mernber beams must be placed on 8x8 posts. <br /> Most of the boxes in this tabl�e contain two optional means of .support. 4tood__ <br /> m snbers may be increased above those indicated in the table, but in no event <br /> may lesser members be used. <br />