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  1. #1
    Join Date
    Jun 2007
    Location
    Melbourne
    Posts
    31

    Default size of boards to use

    I am planning to build a deck
    5.5m wide X 4.5 m long
    what size bearrers and joists should you use


    thank you

  2. #2
    Join Date
    May 2003
    Location
    Kuranda, paradise, North Qld
    Age
    63
    Posts
    2,026

    Default

    Both depend on spans and spacing.

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  3. #3
    Join Date
    Mar 2008
    Location
    Canberra, Australia
    Age
    63
    Posts
    27

    Default

    Not to mention the stress grade of the timber. I suggest that you get a hold of some span tables. Even better, get your hands on a copy of Alan Staines’ book Deck and Pergola Construction Manual. It has the span tables as well as a stack of other useful info. If you are planning on using F5 treated pine for the bearers and joists, here's the link to the tables.
    The first step towards knowledge is to know that we are ignorant.

  4. #4
    Join Date
    Jun 2007
    Location
    Melbourne
    Posts
    31

    Default

    Quote Originally Posted by journeyman Mick View Post
    Both depend on spans and spacing.

    Mick
    bearer spacing 1.5m
    AND
    joist spacing 500mm 4.5m long

    Deck about 800mm from ground

    thank you

  5. #5
    Join Date
    Mar 2007
    Location
    sydney
    Posts
    228

    Default

    Space your bearers further apart and use 6x2 pine joists cause at 1500 you will need 4x2 hwd as pine only goes 1300 continuos span

    6x2 pine will go 2800 continuos although it will bounce at that distance

    joists 450 centres as this is all deck will span unless using 140 x 22 hwd boards

    bearers come down to a trade off between digging and timber size .. if you like to dig use a small bearer and dig plenty of holes if you hate digging like me use a big bearer and less holes

    cheers utemad

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