Tile grout should ideally sit just slightly below the surface plane of the tiles rather than being completely flush or protruding upward. Professional tile installers design grout lines to be slightly recessed—about the depth of the tile's chamfered or cushioned edge—so that the grout forms a clean, concave joint between the tile pieces. If grout is left completely flush or mounded above the tile edges, it is much more susceptible to chipping under foot traffic, eroding during routine cleaning, and collecting dirt and grime. Conversely, if it is recessed too deeply, it can trap standing water in shower installations and create sharp tile edges that are difficult to clean.
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