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  1. #1
    Join Date
    Apr 2013

    Default adding to existing concrete patio

    I would like to add 16'x5' to my existing 16'x11' slab.
    Should I split the new slab in half 8ftx5ft with expansion joint between and do I also need expansion joint on the 16' side??

  2. #2
    Join Date
    Jul 2010

    Default Re: adding to existing concrete patio

    One expansion board on the 16' side should be OK.

  3. #3
    Join Date
    Aug 2007

    Default Re: adding to existing concrete patio

    It will depend on the pattern of your existing deck and the stability of your ground. You will have a natural expansion joint at the separation between the old and new slab, so no worries there. I would recommend splitting the new slab at 8', though I'd do it with a seaming tool rather than a piece of wood or other expansion joint material.
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