I am planning a potential DIY job for a new deck that I want to put on my house. This is roughly what I think we want

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The house is roughly 36' long and the garage roughly 22'. The door from the house is actually only about 15-16' from the outside corner and I want the deck to come about 11' down the back before the stairs come down from there.

The door is on the first level of the home above the rear exposed basement wall, so roughly 1 story high. The house sits on a hill that slightly grades upwards towards the garage at roughly a 12/3 pitch, so the stairs will only be a half flight.

I am variable on how far outwards roughly I am comfortable with the deck extending from the house.

My question is, what would be the optimum layout for posts and beams to properly support this deck? (Assuming that edges of the deck touching the building will be bolted to ledger boards) I have built a simple square deck before but never anything with outside and inside corners and variable length.

  • 2
    Design-wise (both aesthetics and engineering) I'd maybe consider not having that inside corner and just extending the deck out so it's all even.
    – DA01
    Commented Feb 14, 2013 at 20:20
  • @DA01 That is a good consideration actually, it might make everything more structurally sound... I wonder though how far of a joist span would be acceptable beam to ledger board? Commented Feb 14, 2013 at 20:22
  • That depends on the dimensions and type of lumber of your joist. Commented Feb 14, 2013 at 20:24
  • @decker Definitely 6x6 posts and tripled 2x12's for the beam. Joists are probably going to be 2x10, all wolmerized dimensional lumber Commented Feb 14, 2013 at 20:27
  • 2
    @decker I always like to overkill when it comes to supporting a structure... plus I have a lot of obese friends ;-) Commented Feb 14, 2013 at 20:43

1 Answer 1


Blue Dashed Line: Your 3-2x12 Beam

RED X: 6x6 Posts

Deck with beams and posts

  • D.Fir 2x10 @ 16" O.C. spanning 14' + 2' overhang past beam: 16' joists
  • Solid 2x10 Blocking mid-span
  • 6x6 posts @ 12' O.C.

**post edited to match additional info from comments.*


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