Joints larger that 3 8 usually need a more heavily sanded grout to accommodate the large joint.
Grout joint size for wall tile.
However for example a 1 5 mm variation in a grout joint between 3 mm and 5 mm would not be noticeable.
Often we see 1mm grout joints between wall tiles and 3mm grout joints between floor tiles.
Ideally your grout joints would be 1 3mm.
The grout joint size for 12 inch porcelain tiles recommended size.
They also suggest adding to this width the amount of edge warping on the longest edge.
Tcna recommends a minimum 1 8 grout joint for rectified tile and minimum 3 16 grout joint for calibrated tile.
Finished grout lines will vary from 1 16 to 3 16.
The wider spacing will help to accommodate placement of tile and maintaining straight lines.
The tile council of north america and accompanying tile organizations recommend an average grout joint.
Rectified tiles are any man made tile such as porcelain and are specifically designed to have as.
We recommend a 3 16 grout size for our ceramic tile line.
For example grout will discolour over time so keeping the joints smaller will minimse this issue.
Actual finished grout spaces will vary from 1 8 to 1 4 if 3 16 spacers are used.
If smaller spacers like 1 8 are used it will accentuate the size difference of handmade tile.
All ceramic and stone large format tile greater than 15 requires a minimum 1 16 grout joint according to ansi.
Not only does it look better to have smaller joints it also can minimise issues.
For rectified tiles as as3958 1 gives no guidance to joint size then the manufacturers recommendation should be referred to.
For cementitious grout joints smaller than 1 8 generally should only be grouted with unsanded grout and joints of 1 8 and larger should only be grouted with sanded grout.
Daltile recommends that large tiles have a 1 8 or 3 16 minimum grout joint for the most successful installation.
This thickness leaves room for the natural variation in size and the perfectly imperfect edges of handmade tile.