Because of the compressed, fragile nature of tile, it can crack, break and fragment when you try to cut it. The best way to keep tile from cracking is to use a score-and-snap tile cutter or a diamond wet saw.
Particularly within areas that require a lot of cutting and specific cuts in order to install your tiles neatly. Porcelain is much harder to cut and often will require a more professional porcelain tile cutter to cut to the same effect.
Try double scoring the end that is not braking correctly. you could just be missing some pressure on the scoring action. Try slowly breaking the tile with smaller push down actions with the breaker on the tile and slowly move up the tile doing the same instead of one swift snapping action.
Take a putty knife and place it along the cut grout line at such an angle that it is as close to the surface as possible. Take a rubber mallet and tap the end slowly until it is worked under the tile. Now take the putty knife off and put it at the next edge. Repeat the process until all the sides are done.
To cut a tile without a tile cutter, you can use an angle grinder. You’ll want to use a continuous rim blade, which makes a much smoother cut than a serrated blade. Secure your tile to a workbench with a C-clamp. Then, go over your cutline a few times, instead of trying to cut through it in one motion.
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