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Old 09-14-2015, 08:11 PM   #1
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New deck overhang Minimum?


I am building a 10' x 15' deck that is 40 inches above the ground. Is there a minimum overhang past the drop beam? I ask because originally I was going to have an 1.5' overhang, but I had to move the posts farther out so now I will have about a 1 foot overhang, is this okay? I am using 2x8x10 for the joists on 16 center. The drop beam will be (3) 2x10 on three 6x6 posts. Thanks

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Old 09-14-2015, 10:03 PM   #2
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A 12" overhang is fine for a 2 x 8 joist. The question, for me is, what is the unsupported span of the 2 x 8 now?

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Old 09-14-2015, 10:11 PM   #3
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span


I am attaching the ledger to the house and the joists are 10 feet long. The support beams are approximately 9' from the house, is this what you were asking for? Thanks
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Old 09-14-2015, 11:30 PM   #4
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Quote:
Originally Posted by jrod8033 View Post
I am attaching the ledger to the house and the joists are 10 feet long. The support beams are approximately 9' from the house, is this what you were asking for? Thanks
Span is good @ 9 feet.
Southern yellow pine(2 x 8)@ 16" on center is good for over 12 feet. That would be a little bouncy for me, but it conforms to the span tables.
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Old 09-15-2015, 12:19 AM   #5
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Span


Thank you for your help. Would using 12" oc help reduce the bounce, or is it more a function of the joist size? I have an older home and the band/rim joist I am attaching the ledger to is a 2x8.
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Old 09-15-2015, 02:39 PM   #6
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Quote:
Originally Posted by jrod8033 View Post
Thank you for your help. Would using 12" oc help reduce the bounce, or is it more a function of the joist size? I have an older home and the band/rim joist I am attaching the ledger to is a 2x8.
2x10 joists on the same centers would be the best solution, which may require a larger ledger. If you can't do that, increasing the centers will reduce deflection. 2x8 can overhang a max of 1'-10" if using 12" centers (prescriptively). A permit will answer those questions for you.

There is no true "minimum" overhang, the rim can sit directly on the beam. For attachment reasons, my preference is to either have an overhang and hurricane clip to each joist, or connect posts directly to rim using post-to-beam connectors (or posts notched and toenailed). A dropped beam with no overhang somewhat negates the benefits of the beam being dropped--and makes connections more critical. With any overhang you need to make sure your attachment provides the minimum uplift resistance per code, and proper backspan ratios (the latter which you appear to have).


Deck guide has good information:

http://www.awc.org/pdf/codes-standar...Guide-1405.pdf

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Last edited by keymaster; 09-15-2015 at 02:43 PM.
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