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  1. #1
    Novice alx1711's Avatar
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    Default Decking help

    i've got a 7x5m (LxW) deck no roof on it.

    • I've centered my bearers @1500 x 7m length
    • My Joists run @450 centered x 5m length

    I need to specify my timber types, can some one run me through on how to read the tables with correct timber sizes?

    (I am new to decking)
    thanks 2011-08-05_132245.jpg2.jpg

  2. #2
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    Hi Alx1711

    Firstly we need to know what timber your using ie Hwd or treaded pine
    For unseasoned Hwd F17 it will Max span 2100 on a single span and 2300 over continuous, thats over at least 1 mid point. note these are max spans normally I would set 100 x 75 at 1800 centers

    Joists 100 x 50 also at 1800 mm spans so the 1500's would be fine

    to do the same in treaded pine
    Bearers 2/120x45 joined, off set the joins so you dont need to join over posts
    Joists 90 x 45 will span 2000 continuous

    Hope it helps

    Chipp69

  3. #3
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    For what its worth, I would always over engineer from the span tables. These tables specify the minimum required as per the standard, not nessesariy the ideal size.

    Whatever the span tables specify, I would increase the timber sizes or reduce the spans by roughly 30%. The extra cost is negligable but the end result is far superior.

    Ive seen far too many bouncy decks due to sticking to the "span tables". With your specs, I would avoid 90 x 45 joists- work towards 140 x 45 joists and 200 x 45 bearers in T/Pine. It will cost you about $200 more but the end result is simply a rock solid deck rather than a bouncy, flimsy, twisty deck.

  4. #4
    Novice alx1711's Avatar
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    Question Decking help

    i've gone through the timber decking manual and changed the timber sizes (Bearers and joists) as per attached.

    rev.jpg
    BTW i am going for seasoned timber, Deck is for a mate of mine so i have no idea what sort of timber he wants. All i am doing is redesigning his house from sketch drawings using CAD Architecture so he gets an idea of dimensions and so on etc...


    Now i need some help reading this table.
    This is how i've interpreted the table (so please correct me if i am wrong )

    Say hypothetically i am looking at Unseasoned Timber;
    (all numbers are market below table)


    1. I want bearer spacing of max 2400mm
    2. It is a continuous span
    3. say my deck width is 7m so > [ 7/3 (segments) =2.3 ~ 2.5 ] Based on table 2.5m min requirement (this is where i get confused, is 2.5m max span for 200x75 F8 timber? am i doing this right???? )
    4. over engineer it; there fore i go for 2.9
    5. alternatively my Bearer timber is F11 200x75

    I can do up a video if i need to clarify it further?
    bearer.jpg
    Attached Thumbnails Attached Thumbnails 2011-08-05_234932.jpg   bearer.jpg  
    Attached Files Attached Files

  5. #5
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    Yes you are reading it correctly, If you are going seasoned Hwd then it would be F27 and Treaded pine you treat as F7

  6. #6
    Novice alx1711's Avatar
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    Thanks guys, i am gradually getting the hang of it
    I'll be doing another deck shortly (for my place) and i'll see how i'll go.

    I am using this Timber Deck Guide posted on this forum
    http://www.renovateforum.com/attachm...deck-guide.pdf

    which only mentions seasoned and Unseasoned timbers from F5 to F17.
    where can i get the info about the timber Names, types and Sizes that are tabulated??

    for eg. Chippy69 mentioned:

    Seasoned Hwd would be F27 and Treaded pine you treat as F7!

    need more info ...

  7. #7
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    Whilst most treated pine is f7- a lot is also being sold as f5 which you should take into account...

    When you say seasoned hwd... Not all is f27- this is dependent on species as well as seasoning technique (kiln or air dried). You are far better "issuming" f17 for most hwd species (obviously unless specifically declared as f27...

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