12 by 24 tiles can have some bow to them instead of being perfectly flat when set on the floor they ll have a slight arch.
Tile floor no spacing.
How to lay tile without grout lines.
It is not recommended to go below 2mm for wall tiles and 3mm for floor tiles due to the requirement of stress relief.
Where you are installing your tile should also be considered when choosing your grout size.
Crater lake 3x12 design.
It follows that the maximum height of the arch will be midpoint of the tile or in your case at the 12 point of the long 24 edge.
Special types such as slate or quarry tiles often do not have edges uniform enough to look good with tight spacing.
As a general rule floor tiles should have grout lines of 1 8 inch or larger depending on the type and size of tile.
The instructions for installing this tile state using tile spacers speaks of the grout lines suggested size being 3 16 so i would triple check to be certain that these are a self spacing tile as i see no where that that is listed as being the case on any site.
It keeps moisture out of the substrate helps keep tile lines straight and.
For example floor installations should consider using larger grout lines for more traction.
Spacing your tiles an extra mm apart can often save the majority of small cuts across the total length of a wall floor this can make a big difference.