Beam for 23 foot deck

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Old 07-12-16, 07:41 PM
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Beam for 23 foot deck

I am building a 12 by 23 free standing deck. I have two rows of three drilled posts with beam mount hardware approximately 21 inches above ground. Beams will run the 23 foot length. In each row, there is a center post and a post 1 foot from each end, so 10.5 foot beam span. The rows are 10 feet apart so the joist span is 10 feet.

I was planning on a triple 2by10 beam nailed together, but given I essentially only have a center post and I can only get a 16 foot maximum board, where can I join the boards other than have all three joints over center post, so 11.5 foot each. Otherwise I will have unsupported joints.

Given my beam and joist spans, my plan was triple 2by10 for beans, and 2by10 for joists with 16 centers. Does that sound reasonable.
 
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Old 07-13-16, 06:27 AM
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Old 07-13-16, 10:42 AM
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Triple 2x12 beams and 2x10 joists are OK for those spans assuming treated SYP. You might get by with 2x8 joists depending on how far they are cantilevered.

You should be able to get 2x12x24s from a lumberyard; in my area they are even available at menards. That would be greatly preferable to having joints in the beams. Another option would be treated LVLs.

If you try to get by with 16' boards, the joints for all three will be in the center, as a joint in a built up beam must be over a supporting post. With a 6x6 post you would certainly need to use a wide stainless steel saddle connector so the ends of the beam members have more than 2 1/2 inches to bear on; even then it's far from ideal.
 
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