I changed it because I saw that it was disrespectful. I did that on my own, even though at the time I felt I could prove my point.
Nor do I want to engage in "childish competition". You're saying something I've never heard before, and I didn't believe it, until now. Now I believe SOME man made tiles can warp.
I'm staying up late to research this, and I'm finding that there are cases of engineered marble and concrete tiles warping because of their being exposed to moisture on one side during installation.
says that warping is a problem limited to engineered marble tiles. It says: " By contrast, true marbles and granites are usually dimensionally stable."
That page also said that the thicker the tile, the more unlikely it was to warp.
Another page I came across when I Googled "ceramic tiles" and "dimensional stability" was this one from the Tile Institue of America:
Ceramic Tile Intstitute of America - Field Report 24
which says about concrete tiles:
"To a lessor degree, cured concrete can also expand and contract when the moisture content increases and decreases. The re-introduction of moisture to just one side of a cured tile during the installation, may also potentially affect it's dimensional stability. This could result in a possible bonding separation of the tile from either the substrate, mortar and/or grout. Even though this movement is the exception rather than the rule, it is prudent to recognized the dynamics of such a phenomenon, whether minor or major, and take steps to minimize any potential for losing bond."
The problem is that all of these web pages are talking about this as something that "can" happen, but normally doesn't. Also, so far I haven't found one that talks about swelling or shrinking in ordinary ceramic tiles, only engineered marble and concrete tiles. In fact, I've found the opposite.
For example, this page on making ceramic tiles:
How ceramic tile is made - Background, Raw materials, The manufacturing process of ceramic tile, Byproducts, Quality control
"The final product must meet certain specifications regarding physical and chemical properties. These properties are determined by standard tests established by the American Society of Testing and Materials (ASTM). Properties measured include mechanical strength, abrasion resistance, chemical resistance, water absorption, dimensional stability
, frost resistance, and linear coefficient of thermal expansion."
That's telling me that ceramic tiles typically are dimensionally stable, and that also suggests that the warping or swelling or any other movement is the exception rather than the rule.
It's late, I'm tired and I'm going to sleep. I'm going to do some more reading tomorrow.
I now accept that some kinds of ceramic materials do warp and swell. But, from what I'm seeing, this is something that happens occasionally, and then only with, so far, only certain kinds of tiles.