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The recommended width of grout lines for large format tiles typically falls within the range of 1/16 inch to 1/8 inch. This narrower grout line is essential for large format tiles as it helps create a more seamless appearance, allowing the size and design of the tiles to take center stage. Wider grout lines can become more visually dominant, potentially detracting from the aesthetic of the tiles themselves. Additionally, narrower grout lines reduce the amount of grout needed, which can contribute to a more uniform surface and can help in minimizing the potential for cracking, as it allows for slight movement without disturbing the grout.

It's important to recognize that while larger grout lines may be specified for other applications or materials, the specific dimensions suggested for large format tiles take into account both visual appeal and practical considerations related to installation and durability.