There are tolerances for tile lippage.
Ceramic tile lippage standards.
Today however the ceramic tile industry has grown far more complicated as 12 in by 24 in 18 in by 18 in 24 in by 24 in and larger tiles are manufactured in abundance.
This is assuming that the warpage of the tile is within the standard s acceptable range for that type of tile.
Materials environmental and workmanship section 4 3 7 lippage guidelines explanation and caution deals with what is allowable ceramic tile lippage and how to avoid excessive lippage.
American national standards institute ansi a108 02 2013 general requirements.
When excessive this can lead to numerous problems ranging from chipped edges to snagged furnishings and appliances to safety hazards.
The standards state that a tile with a grout joint that is less than wide can have 1 32 of lippage in addition of what the actual warpage is of the tile being installed.
If the grout joint width is 1 4 or greater then the allowable warpage is 1 16 plus the allowable inherent warpage of the tile.
Too narrow grout joints.
Variation in the height of adjoining tiles is called lippage.
Rectangular tiles are harder to lay flat.
This is defined in the ansi american national standards institute standard a108 02 section 4 3 7.
Lippage is the vertical displacement between two adjacent tiles of a ceramic glass or stone installation.
The ansi a108 02 standards say that acceptable lippage for floor tiles with a grout joint width of 1 16 to less than 1 4 is 1 32 plus the allowable inherent warpage of the tile.
Some types of tiles also curve as much as 0 5 the length of the tile such as polished porcelain tiles.
It states for grout joints that are less than 6 mm 1 4 in wide.
For large tiles exhibiting the maximum allowable warpage 50 offsets are guaranteed to exhibit lippage.
Long narrow tiles are used.
Lippage refers to differences in elevation between edges of adjacent tile modules the ansi standard notes that the perception of lippage is influenced by many factors such as.
Narrow grout joints may look pleasing to the eyes but it increases the chance of tile lippage.
A bad batch of tiles tends to show lippage more.
They are telling me it is within the standard based on the tile warpage.
When the specification for ceramic tile american national standard was first revised in 1988 large format tiles were 8 in by 8 in and 12 in by 12 in.
The allowance for such warpage is also spelled out in a137 1 and would apply if your tiles are advertised as meeting that standard.
I just had a complete remodel of my bathroom contractors are using 12 x 24 porcelain tiles.
