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How to measure tongue and groove width?

Discussion in 'Wood / Woodwork / Carpentry' started by Adam78, 14 Jun 2018.

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  1. Adam78

    Adam78

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    How do i measure tongue and groove width?

    Is it measured from end to end including the tongue or just the exposed/coverage area?

    I need to order a piece to replace some rotted wood where the width is 90mm end to end including the tongue and thickness is 9mm. Are the online t&g widths measured in this way or is the width only the exposed area?

    I can't even seem to find any merchants that have the above size?

    how do i measure up to order the correct size?
     
    Last edited: 14 Jun 2018
  2. ray.birch

    ray.birch

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    You'll often have the nominal size (e.g. 25x150mm) which is the size before the product has been planed down.
    Then the finished size, (e.g. 20x145mm).
    On top of that, you may have a face size, which is the distance that each board effectively covers once the tongue has been inserted into the groove above.

    Does that help?
     
  3. Gerrydelasel

    Gerrydelasel

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    Usually it is the coverage, not including the tongue. But there's no guarantee. The building trade is basically s**t when it comes to specifications, so you have to enquire or examine everything. You're doing well when a timber/building supplier lists anything more detailed than:

    Wood for sale.
    Medium
    .
     
  4. big-all

    big-all

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    ex 4" is 88mm coverage 5" is about 112mm
     
  5. big-all

    big-all

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    they quote the width including the tongue
     
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    DIYnot Local

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