1 8 vs 1 16 grout line

They are lugs. If you look at the tile from the side you will see besides the lugs the tile itself is slanted towards the face starting from the lugs. This is what create the grout line. Also how the tile person actually grouts will later the size of the grout line.

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What is the best size grout line?
Does grout line size matter?
What kind of grout do you use for 1/16 joints?

If a tile person over cleans his grout the grout gets washed out of the larger portion of the space and into the narrower part of the "V". You can have the same tile spaced using the lugs and have different size grout lines. With todays waterproofing systems and advanced thinnest the grout is just decorative especially with butt installed tiles.

With darker grout look into Mapei Flexcolor grout. It has a sanded grout appearance and is more difficult to apply on vertical surfaces but it gives a very durable finish that has a dead on color that can even be touched up and still have the same color. Dark color cementitious grouts are notorious for color issues especially if the installer over washes or doesn't mix as per instructions.

The Flexcolor is premixed and the color is accurate throughout. There will be sand everywhere but in the end the extra effort is worth it. With the Flexcolor I would use 1/16th spacers but remember it will give you a larger grout line as the tile itself already has 1/16 built into it. The larger line allows the sanded type grout a space to get into. No it isn't regular sanded grout it isn't even sand it just has a sanded appearance and feel to it. 2 different products.

What is the best size grout line?

As a general rule, floor tiles should have grout lines of 1/8 inch or larger, depending on the type and size of tile. Special types, such as slate or quarry tiles, often do not have edges uniform enough to work with tight spacing. These tiles usually are spaced with grout lines 3/16 inch or wider.

Does grout line size matter?

In no circumstance should any tile be set with a grout joint less than 1/16”. This allows for structural movement in the building, as well as thermal expansion that takes place when tiles warm or cool. The width of the grout joint between the tiles is important for both aesthetic and structural purposes.

What kind of grout do you use for 1/16 joints?

Unsanded grout is a cement grout with less than 1/8” grit. Generally, unsanded grout is used for tile applications with narrower grout joints, from 1/16” to 1/8”. The additional structure of sanded grout is needed for wider grout joints from 1/8” to 5/8” and some even can go as wide as 1”.