Replies

1. 
   user-224517 | Nov 14, 2006 06:07am | #1

   What diagram?

1. 
   Sailfish | Nov 14, 2006 06:10am | #3

   View Image-----------------------------------------------------------------------------

    

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1. 
   JDRHI | Nov 14, 2006 06:13am | #5

   In all seriousness.....the secondary joist in "A" is actually snug to the post, yes?

   FREE SPONGE BOB,SANCHO PANTS!

1. 
   Sailfish | Nov 14, 2006 06:41am | #8

   Yes snug

   The post (4x4) HAS to be notched.

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   Edited 11/13/2006 10:43 pm ET by Sailfish

2. 
   user-224517 | Nov 14, 2006 06:15am | #6

   Definitely a, I dont know why it did not come in your first post it still do'nt came up in the next one though

3. 
   user-201496 | Nov 14, 2006 06:32am | #7

   If you would remove the notch the post would be at least twice as strong!

   Edited 11/13/2006 10:33 pm ET by T White

4. 
   xosder11 | Nov 14, 2006 06:50am | #10

   I don't see either option as much stronger than the other.  I think both posts would be equally likely to sheer off, or bend and break at the skinny part near the top of the notch.  The only advantage I can see is having the additional material near the other side of the post is it may help the bolts not pull through the post as easily.

   Then again, if you were to use big enough washers that would be unlikely anyway.  In all actuallity, the extra wood would mean extra shrinking and I think over time the post would be more likely to loosen up. 

   I guess I vote B for simplicity sake.

1. 
   xosder11 | Nov 14, 2006 06:55am | #11

   Wait, are we talking about deck posts for railings here?  I guess form the detail I just assumed. 

2. 
   JDRHI | Nov 14, 2006 06:10am | #4

   You need to click on the attachment.

   FREE SPONGE BOB,SANCHO PANTS!

2. 
   JDRHI | Nov 14, 2006 06:10am | #2

   Yes..."A" is definetly stronger than "B".

   I doubt any real strength is added at "C" though.

   FREE SPONGE BOB,SANCHO PANTS!

3. 
   Piffin | Nov 14, 2006 06:42am | #9

   What kind of strength?????

   Load bearing of the joist/beam or whatever that is, or lateral strength of the post????

   Or does point C mean compressive strength?

   Say more about the situation. What R U trying to figure out?

    

    

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1. 
   Sailfish | Nov 14, 2006 06:57am | #12

   The lateral strength of the post.

   Is it stronger in a or b? Why?

   It is for porch/deck railing posts.

    

   Thanks.

    

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   WWPD

   Edited 11/13/2006 10:58 pm ET by Sailfish

   Edited 11/13/2006 11:05 pm ET by Sailfish

1. 
   xxPaulCPxx | Nov 14, 2006 07:11am | #13

   I don't think A was done for strength, I think it was done for wear.  The added block may be acting as a washer, it can crack or get crushed some without affecting the integrity of the post.  It may also be acting as a spacer if the bought all the bolts too long not realizing they were going to notch them.Rebuilding my home in Cypress, CA

   Also a CRX fanatic!

2. 
   Piffin | Nov 14, 2006 07:45am | #15

   No diff whatsoever in lateral strength 

    

   Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!

1. 
   McDesign | Nov 14, 2006 02:24pm | #16

   <No diff whatsoever in lateral strength>

   I agree.  Also, as someone else said, there may be an increase in B stiffness because two joists are loaded in torsion.

   But, that might make the post in B slightly MORE likely to fail under a sharp lateral blow because the base is less resilient and lass able to absorb the shock.

   Forrest

1. 
   McDesign | Nov 14, 2006 02:58pm | #17

   Yep; just described the situation to DW as I took her her wake-up coffee in bed.

   She laughed and said it would make the snapped-off post crisper across the break!

   Forrest - you know that prank where you get on your hands and knees behind someone and your friend pushes them over you?  Like that.

2. 
   Sailfish | Nov 14, 2006 04:10pm | #18

   Thanks all.

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4. 
   xosder11 | Nov 14, 2006 07:17am | #14

   Another question would be is the added material shown in option "A" just blocking or is it another full length joist.  If it were a full length joist, then the entire assembly may feel a little stiffer because you would be putting both of the joists in torsion instead of just one.

   However, the post itself IMO is going to actually have the same bending or breaking characteristics in either condition.

   If it's just blocking, I still say B, with the proper washers

   
   

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   Edited 11/13/2006 11:19 pm ET by xosder11