Last week's question confirmed there is a recognized standard for ceramic tile installation. This week let's get more specific about the guideline. ANSI Standard A-3.3.7 defines the term "Lippage", as the "differences in elevation between edges of adjacent tile(s)". The Standard establishes an allowable tolerance for Lippage, a key element in proper installation, based upon the size of the tile and the grout joint width.

True or False? Based upon the ANSI Standard for ceramic tile installation, the allowable tolerance for elevation difference between two adjacent tiles, is no more than 1/16 of an inch (the thickness of two dimes).

True - The American National Standards Institute (ANSI) Standard A-3.3.7, establishes a 1/32" variation in elevation ("lippage") for small tiles (up to 6"x6" with 1/8" grout joint) and larger tiles are permitted to have a maximum of 1/16" of lippage. So, what is the point? The point is, when something doesn't look right - it may not be within the established guidelines, and you may be well within your rights to have it corrected.

Jack Hoye of 100% Realty.