Notch size is the secret code to perfect tiling. Get it right, and your tiles will stay put for decades; get it wrong, and you'll be redoing the job in months. Let me break down the notch sizes for every tiling scenario.
For tiny tiles (mosaics, 5x5cm), 3mm V-notches are ideal. They release a thin, even layer of mortar, preventing oozing between the small gaps. I used these for a glass mosaic backsplash, and the grout lines stayed clean and crisp.
Small tiles (10x10cm to 20x20cm) work with 6mm notches. This size balances coverage and control, great for bathroom walls or small floors. My cousin used 6mm for her 15x15cm bathroom floor tiles, and they've stayed solid through daily showers.
Medium tiles (30x30cm to 40x40cm) need 8mm notches. This is the most versatile size, working for kitchen floors, entryways, and larger wall tiles. I swear by 8mm for 30x60cm subway tiles-they bond firmly without the mess.
Large tiles (50x50cm and up) demand 10mm-12mm notches. These tiles are heavy, so they need a thick mortar bed. My neighbor used 12mm for his 60x120cm living room tiles, and they're still flat and wobble-free.
Heavy materials (stone, marble) often need one size up. A 30x30cm marble tile, for example, does better with 10mm notches instead of 8mm, thanks to its porous surface.
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