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Expansion Strip?

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  1. #1
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    Default Expansion Strip?

    Hello,

    I am matching the front of our "chateau slum" to the back, and in the process of replacing the floorboards at the front.

    The floorboards have a change of direction between the new and old. The back was sanded and coated some time ago. The front is only cut in and resting for some acclimation.

    Does a change in direction necessitate an expansion strip (cork strip or other suggestions?) or is it OK to simply butt up? If a butt up is the go, any tips to cutting a perfectly straight edge across the old existing (pretty straight but trying to avoid any filler......)?

    Also whilst here - is it necessary to raise the unpolished boards by a mm or 2 at the junction for the sander to chop down level to the existing boards?

    With regards to secret nailing - I have read differing requirements regarding staple size for the old cypress joists (will be using Ultraset SF on joists and secret nail). Some references suggest 45mm and others note 50mm - any practical difference?

    Once again - thanks for any assistance and/or advice.

    Cheers

    (The raw cut in boards are the bottom of the photo)

  2. #2
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    No expansion needed because the timber won't expand in length, only width. Un-sanded boards need to be higher, as close to flush BUT higher.

  3. #3
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    Quote Originally Posted by dazza71 View Post
    No expansion needed because the timber won't expand in length, only width. Un-sanded boards need to be higher, as close to flush BUT higher.
    yea but the floor boards going to over way will expand in width against the end grain

    suggest 4mm gap filled with sika flex,

    if heights dont work plan the bottom of baord before nailing or sand down the subfloor with an edger

  4. #4
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    Thanks Dazza / Gazza.

    Interestingly enough - my floor sander friend dropped past last night. He also said to just leave it just above flush. He has seen a few jobs in his life, thought it would be OK just to butt it up (...although he is not an installer / chippy).

    In the interests of expansion joist (I would rather be safe than sorry) - any benefit to a cork expansion compared to the Sikaflex or vice/versa? Sikaflex pumped in prior to or after sanding?

    The area in question is a high traffic area but the boards only run about 2m in width prior to butting up.

  5. #5
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    Cork expansion is easier to get looking right, Sikaflex is a messy beast & it is hard to get nice & even. Throw your cork in there before sanding & polishing, she'll be good to go.

  6. #6
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    Awesome - thanks for the help. Just gotta find a cork strip now......

  7. #7
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    You should be thinking about expansion across the whole floor, not just where it butts into this end grain. Per AS1684, loose clamping, effectively creating 10mm worth of tiny gaps spread across 5m of flooring, is sufficient to allow for expansion.

  8. #8
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    Cork strip on the way, Ultraset and staples arrived........just waiting for the boards to acclimate..........

  9. #9
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    Just thought would pass on update:

    Ultraset - used the sausage - crap goes everywhere if not careful! I used gloves......but failed to clean the thread of my sausage gun properly one day and it is securely stuck. Definitely not coming off....

    Cork - can either buy a sheet of cork from a cork supplier (google is your friend) and cut into sheets or a relatively few flooring places stock some that they have cut into strips. It cuts very nicely on a table saw. Bit of glue on either side or a piece of timber under the joint to support it - voila!

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