Daltile recommends that large tiles have a 1 8 or 3 16 minimum grout joint for the most successful installation.
Grout joint size for wall tile.
For example if the edge warping of a rectified tile is 1 32 the minimum grout joint is 1 8 1 32 5 32.
We recommend a 3 16 grout size for our ceramic tile line.
Ideally your grout joints would be 1 3mm.
Joints larger that 3 8 usually need a more heavily sanded grout to accommodate the large joint.
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.
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.
Not only does it look better to have smaller joints it also can minimise issues.
A higher quality tile could allow for a 1 16 or 1 8 grout line and maybe even a brick layout as lippage may not be an issue in a perfect tile world where as a lower quality tile might have major lippage risk so laying the tile in 1 3 s and having a 1 4 grout line is recommended.
Actual finished grout spaces will vary from 1 8 to 1 4 if 3 16 spacers are used.
Finished grout lines will vary from 1 16 to 3 16.
If smaller spacers like 1 8 are used it will accentuate the size difference of handmade tile.
Rectified tiles are any man made tile such as porcelain and are specifically designed to have as.
This thickness leaves room for the natural variation in size and the perfectly imperfect edges of handmade tile.
For rectified tiles as as3958 1 gives no guidance to joint size then the manufacturers recommendation should be referred to.
The grout joint size for 12 inch porcelain tiles recommended size.
Note that using the smallest grout possible will increase installation time.
Tcna recommends a minimum 1 8 grout joint for rectified tile and minimum 3 16 grout joint for calibrated tile.
Often we see 1mm grout joints between wall tiles and 3mm grout joints between floor tiles.
However for example a 1 5 mm variation in a grout joint between 3 mm and 5 mm would not be noticeable.