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Thread: Joist spacing

  1. #1
    Join Date
    Jul 2006
    Location
    Port Huon
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    373

    Default Joist spacing

    I'm in the process of fixing up a room to use as a workshop. It was once a verandah that has been enclosed at some stage. The floor is t&g, not sure what timber ( not hardwood.) I''ve cleaned up the boards and replaced a few rotted (borers?) ones.

    I'm going to lay green tongue boards over top both for appearance and for a bit of extra strength. The guideines for green tongue say to that joist spacing should be 450mm, the spacing on my floor is 600mm. (90x50 hardwood joists).
    Green tongue panel is 3600x900 and will be layed with long side parallel to joists. Will this joist spacing be OK?

    The condition of the joists and bearers look OK. Bearer spacing is about 1700mm so I will be adding a couple of extra bearers (LVL 150x63) so that bearers will be at (about) 1000mm centres. Room size is 2400mm x 4000mm with bearers across the smaller dimension.

  2. #2
    Join Date
    Nov 2004
    Location
    Melbourne
    Posts
    173

    Default

    just use the 22mm thick particle board for 600mm spacings instead of the 19mm. each manufacturer will have different colour tongue.

  3. #3
    Join Date
    Nov 2001
    Location
    Parkside - South Australia
    Age
    46
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    479

    Default

    Are you laying the particle board over the existing T&G or are you going directly onto the joists?

    If it is over the T&G then I would think that the green tounge would be fine as it isn't spanning 600mm, it is using the T&G as the supporting structure.
    Now proudly sponsored by Binford Tools. Be sure to check out the Binford 6100 - available now at any good tool retailer.

  4. #4
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    use red tongue instead
    Regards, Bob Thomas

    www.wombatsawmill.com

  5. #5
    Join Date
    Jul 2006
    Location
    Port Huon
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    Default

    The green tongue will be layed over the existing t&g.
    I already had the green tongue otherwise I would have gotten red tongue as suggested.

  6. #6
    Join Date
    Jan 2005
    Location
    Sydney
    Posts
    191

    Default

    No issue with it being laid on top of T&G as the T&G is already spaning the joists. Try to screw fix through the T&G into the joists

  7. #7
    Join Date
    Jul 2006
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    Port Huon
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  8. #8
    Join Date
    Jul 2006
    Location
    Port Huon
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    Default

    I was planning to glue and nail, not screw because there will be no floor coverings, and I didn't want the fastenings to show.
    I intend to apply a few coats of polyurethane as a finish, probably Wattyl 7008

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