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