# Thread: Help a tile fixer

1. ## 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.

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.

2. 20 cos (45 Degrees) = 20 times square root of 2 divided by 2 which is about 14.1 mm.

3. 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.

4. Thanks guys.
I can sleep now.
I was wrong by the way.