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Old 05-30-2017, 07:56 PM   #1
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lateral bracing with short deck posts


Building my new deck atop concrete piers and I've come to the first couple potential issues I didn't account for. From where I need the decking to hit against the house under the door sill, to the top of my post bases leaves me 31". By my calculations for 2x6 decking, 2x10 joists, and 2x10 beams, I should have about 11" for some squatty deck posts.

First, this makes the underneath virtually inaccessible with less than a foot of crawl space. This may be why the previous deck had the joist and beam layer collapsed into one. I really don't want to build it that way. Is this a problem? Or perhaps a code violation? I can't think of a reason I would ever need to get under there, but I'd certainly hate to have to rip my decking off to get access.

Second, lateral bracing. I assume having shorter posts reduces (and i'm ONLY assuming) racking. But if not, is there a good way to add lateral bracing to posts this short?
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Old 05-31-2017, 06:09 AM   #2
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Re: lateral bracing with short deck posts


Is the span small enough for 2x8 joists?

If it's tied to the house, no lateral bracing required for sure.
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Old 05-31-2017, 06:44 AM   #3
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Re: lateral bracing with short deck posts


Lay out your materials and measure them. Set aside 2x10s for beams and joists for widths that are close. Take your biggest measurement, add them up, and make sure you don't add mistakes later - such as uneven lumbers in a beam, joists not even with ledger, lumbers not sitting on beams, posts, etc. Add 1/8" to the numbers you need.
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Old 05-31-2017, 07:06 AM   #4
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Re: lateral bracing with short deck posts


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Originally Posted by 123pugsy View Post
Is the span small enough for 2x8 joists?

If it's tied to the house, no lateral bracing required for sure.
I think the longest span is 9'. But if I switch to 2x8 I'm still only gaining 2" back. Will that even gain me anything? It is a free standing deck.
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Old 05-31-2017, 07:26 AM   #5
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Re: lateral bracing with short deck posts


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I think the longest span is 9'. But if I switch to 2x8 I'm still only gaining 2" back. Will that even gain me anything? It is a free standing deck.
Only if you need to really crawl under. 2" is better than nothing.
My front porch is like this.
I don't see any reason to go under there.

Frame it up and check if you need bracing for it.
You'll feel if it's stiff or not by standing on top and try swaying it back and forth.
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