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Math Help - Help a tile fixer

  1. #1
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    Help a tile fixer

    I wonder if you can help.
    I'm having a bit of a debate with some tiler friends of mine.
    The debate is to do with adhesive bed depths.
    If I use a trowel withe a square notch, and a depth of 20mm, like this.

    I spread my adhesive with the trowel at a 45* angle.

    Like so.
    What will be the thickness of the adhesive bed?
    If you could give me an answer, and some workings out, that would be great.

    I wish I'd payed more attention at school.
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  2. #2
    Super Member Matt Westwood's Avatar
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    20 cos (45 Degrees) = 20 times square root of 2 divided by 2 which is about 14.1 mm.
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  3. #3
    MHF Contributor

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    I wish I'd could lay tile, but I can't. So this may be totally wrong.
    But I think that you have an isosceles right triangle with hypotenuse 20mm.
    So the height of the adhesive bed is that of one leg.
    So we get: \sin \left( {45} \right) = \frac{h}{{20}}\quad  \Rightarrow \quad h = 20\sin (45) = 10\sqrt 2  \approx 14.14mm.
    I hope that is correct in tiling, it is in mathematics.
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  4. #4
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    Thanks guys.
    I can sleep now.
    I was wrong by the way.
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