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  1. #1
    Join Date
    Dec 2007
    Location
    NZ
    Posts
    24

    Default Joist spacing is it 450 c or 450 in and over

    Was just wondering for 20mm Kiwla Decking when they say 450 is that from centre of joist to centre of joist or is that an in and over measurement a little confused?

    Also someone told me that with kwila decking, not to used any spacings just butt them hard up against each other and in time they will shrink and form their own gaps? is this the way its done?

    I have relayed some decking in the past and used spacer nails between boards, and with the spacer nails in place and have about 5 boards ready to be nailed I want to get a straight line of nailing but cant because the spacer nails are in the way to get a chalk line down the joist. Anyone has a different way of doing this?

  2. #2
    Join Date
    Oct 2007
    Location
    Sydney, Australia
    Posts
    65

    Default

    450 is standard centre-centre measurement.

    I always advocate spacing boards - even if a small gap - because it allows you to adjust if the run gets out of parallel as it aproaches the finishing end. Try a nail about 2½mm thick. Remember the gap also allows some air circulation...

    A nice staggered pattern is easy if you eyeball either side of a stringline along the joist centre, or even make up a template and shallow drill the holes before laying. As a licensed contractor, I'd refuse to nail inline because I believe it predicates a greater risk of the joist splitting lengthways.

    Regards, Adam.

  3. #3
    Join Date
    Apr 2006
    Location
    Melbourne Victoria
    Posts
    0

    Default

    Move the spacer nails, either to the edge of the joist or off the edge and let them hang there. A simple trick is to get a few bits of scrap or cardboard and put your spacer nails through these, to act as washers to stop the nails falling through the gap

  4. #4
    Join Date
    Sep 2004
    Location
    Strzelecki Ranges Victoria
    Posts
    395

    Default

    If you're within a designated 'bushfire prone area' the minimum spacing is 5mm. Someone can correct me if this isn't Aust. wide.
    Peter Clarkson

    www.ausdesign.com.au

    This information is intended to provide general information only.
    It does not purport to be a comprehensive advice.

  5. #5
    Join Date
    Aug 2003
    Location
    Pambula
    Age
    59
    Posts
    5,026

    Default

    Ditto in NSW.

    I use wedges to gap mine and I tap them in a couple of inches beyond the joist so they're not in the way. It's part of a system though, so it probably wont work for you unless you do the 'lay every 5th board and fill in the gaps' method.
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  6. #6
    Join Date
    Jan 2007
    Location
    Goulburn NSW
    Age
    89
    Posts
    7

    Default

    they are the same spacing 450 c to c or 450 in and over
    les

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