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  1. #1
    Join Date
    May 2009
    Location
    Healesville
    Posts
    4

    Default Decking joists, need 2 sizes???

    Hi Folks,
    Been enjoying the great reading on here about screw vs nail deck so thought what better place to get a bit of advice.
    I am building a deck and have followed span tables but have reached a bit of a hitch.
    There is a part of my deck where the joist spans are around 2.1m instead of the rest which are about 1.4m.
    This of course means I need something like 140x45's instead of the rest being 90x45.
    Can anyone see a way around this? I presume I cannot botch the joists to match the height? And I can't notch the stump for the bearer as it runs the wrong way (hard to explain). Could I use a different type of wood for these joists perhaps? It's all treated pine with merbau decking. Joists are about 420mm apart.
    Cheers,
    Marcus


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  3. #2
    Join Date
    Apr 2005
    Location
    Nerang Queensland
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    66
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    10,766

    Default

    You'd be better off trying the Renovators Forums
    Neil
    ____________________________________________
    Every day presents an opportunity to learn something new

  4. #3
    Join Date
    Aug 2010
    Location
    Baldivis WA
    Age
    40
    Posts
    2,761

    Default

    Is this 2.1 m span able to be bolted to an existing wall or pillars if so u will be fine to use the 90 x 45

    Ian

  5. #4
    Join Date
    Aug 2010
    Location
    Baldivis WA
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    40
    Posts
    2,761

    Default

    Lol just read it is a joist not a bearer Lol

    Ian

  6. #5
    Join Date
    Nov 2006
    Location
    Melbourne
    Age
    64
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    848

    Default

    Why not just put in an extra bearer in that section?
    TM

  7. #6
    Join Date
    Jul 2005
    Location
    Oberon, NSW
    Age
    63
    Posts
    13,354

    Default

    One possible alternative would be to check the span tables and see if you can get away with 90x45's... it may be possible with much closer spacing. (eg. 300mm instead of 600)

    (And yes, it is NOT recommended that you botch the joists or the bearers! Not if you want it passed/signed off at any future inspection! )
    I may be weird, but I'm saving up to become eccentric.

    - Andy Mc

  8. #7
    Join Date
    Nov 2011
    Location
    pomona
    Posts
    105

    Default Joist dilemna

    Quote Originally Posted by Digby View Post
    Hi Folks,
    Been enjoying the great reading on here about screw vs nail deck so thought what better place to get a bit of advice.
    I am building a deck and have followed span tables but have reached a bit of a hitch.
    There is a part of my deck where the joist spans are around 2.1m instead of the rest which are about 1.4m.
    This of course means I need something like 140x45's instead of the rest being 90x45.
    Can anyone see a way around this? I presume I cannot botch the joists to match the height? And I can't notch the stump for the bearer as it runs the wrong way (hard to explain). Could I use a different type of wood for these joists perhaps? It's all treated pine with merbau decking. Joists are about 420mm apart.
    Cheers,
    Marcus




    Sent from my iPhone using Tapatalk - now Free


    Marcus, there is an easy fix. Your joists run at 90 degrees to your bearers - yes. The 90x45 joist can span your bearers (sit on top) whilst your 140x45 can be end notched so that 90mm of depth sits on top of the bearer and the bottom 50 mm of depth butts to the face of the bearer and is supported by a joist hanger at each bearer. Regards, Timboz

  9. #8
    Join Date
    May 2012
    Location
    Woodstock (Cowra)
    Age
    74
    Posts
    3,373

    Default

    Quote Originally Posted by timboz View Post
    Marcus, there is an easy fix. Your joists run at 90 degrees to your bearers - yes. The 90x45 joist can span your bearers (sit on top) whilst your 140x45 can be end notched so that 90mm of depth sits on top of the bearer and the bottom 50 mm of depth butts to the face of the bearer and is supported by a joist hanger at each bearer. Regards, Timboz
    This is correct
    The person who never made a mistake never made anything

    Cheers
    Ray

  10. #9
    Join Date
    May 2009
    Location
    Healesville
    Posts
    4

    Default

    Hey Guys,
    Cheers for this, so I can botch the end of the joist to get the height match and then use a joist hanger to support the lower part of it, I think that makes sense.
    I've also found a hardwood span table that says F17 will span 2.1m, so this may save me a bit if work!
    Thanks for the responses.


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