Adhesive thickness

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Hi all hoping someone can advice. I'm about to apply some tiles to my concrete hearth. Tiles are 4 x 2 inch. I need to achieve a final adhesive thickness of approx 6mm but am unsure how best to do this. Searching shows generally that the finished thickness will be half that of the notch ie 12mm will give 6mm final thickness but it doesn't make sense as surely the Trowell goes at 45 degrees so you will never achieve 12mm high ridges and thinking it would be more like 6mm and finish at around 3mm. I'm thinking best option would be a 12mm trowel and apply to both surfaces is concrete and tile
Cheers I advance
 
Hi all hoping someone can advice. I'm about to apply some tiles to my concrete hearth. Tiles are 4 x 2 inch. I need to achieve a final adhesive thickness of approx 6mm but am unsure how best to do this. Searching shows generally that the finished thickness will be half that of the notch ie 12mm will give 6mm final thickness but it doesn't make sense as surely the Trowell goes at 45 degrees so you will never achieve 12mm high ridges and thinking it would be more like 6mm and finish at around 3mm. I'm thinking best option would be a 12mm trowel and apply to both surfaces is concrete and tile
Cheers I advance
Why so thick?
 
AFAIK, tiling trowels are normally pitched at 90 degrees. I have only seen LVT trowels with a 45 degree pitch.
 
With a small area like a that you could put a thin layer of adhesive down and then when it’s dry, put your tiles on a thinner bed.
 
With a small area like a that you could put a thin layer of adhesive down and then when it’s dry, put your tiles on a thinner bed.
Ok that's an idea. What's it roughly the maximum thickness I could get in a single application
 
why not just plaster the area to the required thickness, then tile over it when dry?
 
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