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Expansion joint

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  1. #1
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    Question Expansion joint

    I have a floor 7m wide. My understanding is I'll need to provide an expansion joint to compensate for the boards expansion. I've heard of two implementations:

    1. 10mm gap filled with cork.

    2. 1 - 1.5mm gaps at regular intervals (every 10 boards or so), so the expansion joint is more distributed rather than in one spot.

    Which method is better?

    Since the cork will probably stand out I am more interested in the second method, but I don't know if the boards will stick together when the floor is polished.

    Can someone advise/share his experience?

    Thanks.

  2. #2
    Oink! Oink! pawnhead's Avatar
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    Quote Originally Posted by ptt102 View Post
    2. 1 - 1.5mm gaps at regular intervals (every 10 boards or so),.
    That would look pretty weird.
    Aren't you having skirtings?
    If not, then just cut the gyprock, or render out, and plaster down to the floor. It can expand underneath.

    In my place I've got shadowline and no expansion joints. It looks like the wall is floating 10mm off the floor. It's about six metres wide, but the floor runs under the walls, so no expansion hassles
    Cheers, John

    Short Stack (my son's band)


  3. #3
    Hwd Flooring Manufacturer glock40sw's Avatar
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    Number 2.

    BTW...Cork does blend in well with most floors, and is virtually invisible. 1x12mm cork expansion joint with 12mm gap at each side wall for 80mm T&G.
    Hooroo.
    Regards, Trevor
    Grafton

  4. #4
    Hammer Head - 1K Club Member
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    go the 1.5mm this looks nice

  5. #5
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    Thanks guys.

    I'll provide clearance from the walls, but the expansion join is because of the floor width >6m.

    I was actually wondering if the distributed expansion joint would look weard.

    Does anyone know where in Melbourne to look for cork for this purpose? If it doesn't stand out a lot I may to that instead.

  6. #6
    Hwd Flooring Manufacturer glock40sw's Avatar
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    Try Craig at Connolly's.
    They are in Coburn? Anyway, somewhere in mexico...
    Hooroo.
    Regards, Trevor
    Grafton

  7. #7
    Hammer Head - 1K Club Member
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    Quote Originally Posted by ptt102 View Post
    Thanks guys.

    I'll provide clearance from the walls, but the expansion join is because of the floor width >6m.

    I was actually wondering if the distributed expansion joint would look weard.

    Does anyone know where in Melbourne to look for cork for this purpose? If it doesn't stand out a lot I may to that instead.
    embelton sell the cork strips, alternatively if you wish to use a single mid floor joint you can form a gap with a packer around 10mm then after the floor is sanded & coated it can be filled with sika flex pro colour matched to the timber.

  8. #8
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    My lounge room has no expansion joints and is about 5.5m. x 6.5 m.
    It is a jarrah floor and the boards are 140 mm wide.
    There are no creaky noises when you walk on and no apparent movement in the floor at all.
    It is 105 years old and a more beautiful floor would be hard to find.
    If you have the space around the edge I don't think you would need further expansion joints

    Regards Bradford


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