and it's due to a concept called tile lippage, which is where the edge of one tile is not perfectly in line with the adjacent tile height-wise, creating an uneven and poorly-installed appearance.
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How To Square A Room For Tile Layout Using The 3-4-5 Method (& Common Mistakes To Avoid)What's worse, laying tile on an uneven surface is just bad practice that leads to tile lippage — an unattractive and dangerous condition in which adjacent tile edges are not horizontally aligned.
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