They also suggest adding to this width the amount of edge warping on the longest edge.
Grout joint size for wall tile.
Ideally your grout joints would be 1 3mm.
Actual finished grout spaces will vary from 1 8 to 1 4 if 3 16 spacers are used.
The tile council of north america and accompanying tile organizations recommend an average grout joint.
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.
Rectified tiles are any man made tile such as porcelain and are specifically designed to have as.
Note that using the smallest grout possible will increase installation time.
Not only does it look better to have smaller joints it also can minimise issues.
All ceramic and stone large format tile greater than 15 requires a minimum 1 16 grout joint according to ansi.
For rectified tiles as as3958 1 gives no guidance to joint size then the manufacturers recommendation should be referred to.
Joints larger that 3 8 usually need a more heavily sanded grout to accommodate the large joint.
For example grout will discolour over time so keeping the joints smaller will minimse this issue.
The wider spacing will help to accommodate placement of tile and maintaining straight lines.
Finished grout lines will vary from 1 16 to 3 16.
For example if the edge warping of a rectified tile is 1 32 the minimum grout joint is 1 8 1 32 5 32.
Tcna recommends a minimum 1 8 grout joint for rectified tile and minimum 3 16 grout joint for calibrated tile.
We recommend a 3 16 grout size for our ceramic tile line.
The grout joint size for 12 inch porcelain tiles recommended size.
However for example a 1 5 mm variation in a grout joint between 3 mm and 5 mm would not be noticeable.
This thickness leaves room for the natural variation in size and the perfectly imperfect edges of handmade tile.
If smaller spacers like 1 8 are used it will accentuate the size difference of handmade tile.