How Wide Should Grout Lines Be

Grout lines need to be at least 1/16” for the grout to even fit, and often larger than that depending on a variety of other factors. For some grouts, like sanded cement grout, 1/8” is the minimum line size.

What is standard grout width?

There is no standard for grout joints. According to the TCNA, the grout width can vary depending upon the size of the tile. Many stone and tile manufacturers suggest that grout joints be no less than 1/8″ to 3/16″.

Can grout lines be too big?

As a general rule do not go larger than 3/16″ although under certain circumstances such as some slates and quarry tiles, 1/4″ is acceptable. If you choose to use smaller grout lines you must ensure the tile will allow it.