Which trowel for 1kg tiles?

The answer is simple if you follow this simple rule, 6mm trowel for 6-8 inch tiles. 8mm for 8-10 inch, 10mm for 10-12 inch and so on. 12mm and above is usually used on a floor. The weight is determined by the back ground u are applying the tiles to, for example plasterboard can hold upto 32kg per m2 and plaster skim upto 20kg per m2. Hope that solves your problem

Just to add .. Preparation is key...no one has mentioned it .. SBR seal Surface first ..,it will help with adhesion. Also just for a good bond if you are concerned .. back butter your Tile as well (sometimes it’s necessary to hand fix).. Good luck with your project GW

The plasterboard you’re tiling onto should be dry, securely fixed. Ensure the screws have been driven in just enough so they break the surface of the paper, don’t screw too far as this will crush the plaster and prevent a secure fix. The boards should be a minimum 12.5mm thick when fixed to timber framing or battening and fixed in accordance with the manufacturer’s recommendations. Ensure that surfaces to be tiled are flat, clean, sound and free from contamination. 6mm notch = 6-8 inch tile, 8mm notch = 8-10 inch tile, 10mm notch = 10 -12 inch tile, and so on. A 12mm notch would be used for any tile over 12 inches. This is a general rule and things can change due to the flatness of the surface you’re tiling onto . If the surface isn’t flat, then you can increase the notch to the next size to what would be generally used.

For that weight tiles you need to back butter the tile as per building regs 10mm on wall and 6 mm on the back of the tile Please do not do anything otherwise iv seen to many near missed with kids in baths when prep work is not 100%