Can I have 3(2x8) beam/girder with 2x10 joists 12" OC? I'm building a 16x16 ledger mounted deck. Two footings were poured a little higher than they should be. There are four 16" footings of 5,000 psi concrete supporting 6x6 posts.

  • Why can't the posts be shortened?
    – isherwood
    Commented Nov 14, 2018 at 3:39
  • Typically beams need to be the same height as the joists unless you have special hangers designed for the job.
    – isherwood
    Commented Nov 14, 2018 at 3:40
  • One of the four 16" was poured 1.5 inch too high
    – skillsman
    Commented Nov 15, 2018 at 2:14
  • So you said. It's normal for footings to be slightly out of level, as concrete is more difficult to set precisely than framing. Again, why can't the post be shortened?
    – isherwood
    Commented Nov 15, 2018 at 2:39

1 Answer 1


Reference the American Wood Council's Residential Wood Deck Construction Guide free download pdf.

It looks like 3 2x8 beams allow a longer joist span than 2 2x10s.

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