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I want to build a mostly ground level deck. I have created plans and I want it to be 16' x 20' one long side will have a notch for a circle of rocks and a firepit. my issue is along straight the 20' side. I don't have 20' lumber available. How can I handle where two 10 foot boards meet? I've kept everything well below max span. I'll be using ground contact pressure treated lumber, and I checked it's southern pine.enter image description here

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You could double up on the Joist back to the blocking and just have one rim a bit longer than the other.

Not sure how you are fastening the Rim to the end of the Joists, but you could use a double 2x Hanger on the rim to attach the joist and its doubler from the inside with something like an HHUS26-2.

If you wanted to go Simple get a 10' and a 12' and then put the splice between the joists and then use the scrap from the 12' as a backing to bind the two rims together.

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Another idea, I'd shorten that middle joist by 1.5" and double up the (looks like) 30.5" section of the rim joist between the adjacent joists with a piece 2x8 x 30.5".

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    so the back joist would be two 10's with a 30.5" board binding them? and the center joist that is perpendicular to half hexagon would be trimmed down at the back to accomodate? – MVCylon Sep 7 '18 at 13:32
  • @MVCylon - Yes, that's what I'd do. – batsplatsterson Sep 7 '18 at 13:35

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