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Old 08-11-2011, 07:47 AM   #16
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Deck swaying too much...help needed


You supposed to use at minimum a 6" wide board according to Ibc. Go under your deck with a 5/4 x 6 pt deck board and place it diagonally across the underside of all the joists. This will stiffen it up surely.

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Old 08-11-2011, 09:21 AM   #17
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Deck swaying too much...help needed


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I just drew that real quick. Nail the 2x4's on the back side of the 6x6's so that you don't see them as much.You don't have to bolt them.
Attach to both posts or to the bottom of the post and the beam?

@dvatt - are you suggesting the horizontal deck board in addition to the diagonals on the post/beam or instead of?

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Old 08-11-2011, 04:40 PM   #18
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Deck swaying too much...help needed


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Originally Posted by Seven333 View Post
Attach to both posts or to the bottom of the post and the beam?

@dvatt - are you suggesting the horizontal deck board in addition to the diagonals on the post/beam or instead of?

Thanks.
Both posts is all you need to do.
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Old 08-11-2011, 07:52 PM   #19
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Deck swaying too much...help needed


Go with the diagonal underneath the deck first that will help. It will tie all of the joist together. Running deck boards on a 45 degree is always wise as it really stiffens up a deck. You could
Make an x and go from corner to corner to help tie everything in. Now if you have bounce in your deck it would require another drop beam.
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Old 08-11-2011, 08:20 PM   #20
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Deck swaying too much...help needed


I am not familiar with IBC rules, my town uses IRC. See page 14 of the Prescriptive Guide, figure 22 shows 2x4 typical for the diagonal brace. Also, in the diagram, the brace runs from the post to the beam, and diagonal braces are shown on either side of the post. You can certainly run from post to post as Joe Carola showed, it requires a longer 2x4, but may increase stiffness slightly versus post to beam.

I can say that my deck has no detectable sway, and I used 2x4 bracing from post to beam.
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Old 08-11-2011, 08:30 PM   #21
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Deck swaying too much...help needed


Decisions, decisions...

If I go with the under joist bracing, is there some kind of metal or cable that I can use versus a deck board or 2x4 or 6?
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Old 08-11-2011, 09:22 PM   #22
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Deck swaying too much...help needed


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Decisions, decisions...

If I go with the under joist bracing, is there some kind of metal or cable that I can use versus a deck board or 2x4 or 6?
I don't think you NEED the under joist brace. The post to beam brace will work wonders...

I've installed the post to beam braces and no joist braces on three decks now and they were all solid. So, I would start with the post to beam and if you want more then do the joist. Your best bang for your buck & time will be the post to beam braces.
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Old 08-12-2011, 07:23 AM   #23
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Deck swaying too much...help needed


If you do that long bracing from post to post it looks terrible. Just brace from post to drop beam
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Old 08-12-2011, 08:33 AM   #24
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Deck swaying too much...help needed


Guys, thanks again! This is at the top of the to-do list and I'll report back once completed! If I had to do the deck over again, I'd add more or bigger posts and use diagonal decking! Live and learn...
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Old 08-12-2011, 08:35 AM   #25
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Guys, thanks again! This is at the top of the to-do list and I'll report back once completed! If I had to do the deck over again, I'd add more or bigger posts and use diagonal decking! Live and learn...
You would still need the bracing to properly stabilize the deck.
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Old 08-12-2011, 07:02 PM   #26
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If you do that long bracing from post to post it looks terrible. Just brace from post to drop beam
How is that any different than what I drew? I drew the brace running from the bottom of the post to the end post just under the girder.
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Old 08-13-2011, 09:51 AM   #27
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They should be about 2 feet long and the interior bracing on the post would form y's the pic you drew looks amateur
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Old 08-13-2011, 09:57 AM   #28
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Deck swaying too much...help needed


Thanks for all of the posts about the deck cross bracing. This deck luckily has the ledger board attached to the house for lateral stability at one end.
I have a similar but what seems like a more complicated problem.
I built a completely freestanding elevated platform (9ft up)for my kids playset (12x18) to be built off of. It rests on (6) 6x6 posts sitting on 10" diameter concrete piers, with doubled up 2x10s acting as beams between each pair of posts.
After assembling the posts, beams and joists the platform had a serious sway on top, despite being very stable vertically. I added several diaganol braces from the joists to the beams and posts. This helped with some of the swaying, especially parallel to the beams. The swaying perpendicular to the beams was much worse.
I am considering diagnol bracing from the beam to the base of the posts OR heavy gauge cable bolted to each side with a tensioning turnbuckle on each cable.
Any thoughts on the two bracing methods??? or how to attach them most securely to the beam and posts?
Please note that I intend to hand a climbing wall, swings, a slide and other playset items off of this platform.
Thanks for your insight!
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Old 08-13-2011, 10:10 AM   #29
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Deck swaying too much...help needed


MKB63, you may need to post some pictures. For a free standing deck, you need to brace both directions. See pages 14 and 15 of the Prescriptive Guide I have mentioned several times for a full discussion about bracing a free standing deck. I was not clear from your post exactly how you did your bracing, did you go both directions?

There is also a discussion on page 15 of the Prescriptive Guide regarding attaching a free standing deck to the house via the rim joist. I know this sounds odd, attaching a free standing deck to the house, but it is done to minimize sway, exactly what you have encountered.
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Old 08-13-2011, 11:47 AM   #30
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They should be about 2 feet long and the interior bracing on the post would form y's the pic you drew looks amateur
Never said it looks good because it doesn't. Looks aren't going to solve his deck swaying problem. I don't think your way will solve the problem. Running the braces the way I drew will definitely solve his problem.

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