As a general rule floor tiles should have grout lines of 1 8 inch or larger depending on the type and size of tile.
Marble subway tile grout line.
If you are going for high contrast or retro style wider grout spacing gives you the opportunity to make a statement with your grout.
In most other tile i will use 1 16 or 1 8 inch lines.
How to grout marble tile.
The best thing to do is use the smallest grout line your particular tile will allow and get a grout that closely matches the tile.
For most granite and marble tile i install i use either 1 32 or 1 16 inch grout lines.
Special types such as slate or quarry tiles often do not have edges uniform enough to look good with tight spacing.
Note that using the smallest grout possible will increase installation time.
Grout including sealed grout tends to wear more quickly than tile and become more porous and prone to staining.
This is true of man.
Thinner grout spacing for subway tile creates a more subtle effect and wider grout lines a more dramatic one.
I try to use the smallest grout lines the tile will allow.
This thickness leaves room for the natural variation in.
Grout lines for floor tiles.
Although tile installations can be installed in groutless format the traditional method calls for grout to be placed in the joints between the tiles.
We recommend a 3 16 grout size for our ceramic tile line.
Finished grout lines will vary from 1 16 to 3 16.