I am wanting to get part of my home tiled. It's about 1000 sf. I have
chosen a porcelain ceramic tile, Continental Slate by Dal-Tile. The
pattern is a "modified hopscotch" using 4 different sizes of tile - 18x18,
12x18, 12x12, and 6x6. The manufacturer's recommended spacing is 3/16".
As the installer started laying the tiles, he found that the pattern was
becoming more and more "off", and he was having to make the grout lines
wider around the 18x18 tiles to attempt to compensate. Finally he stopped
working, as it became clear that it was getting worse, with some of the
lines being twice as thick (6/16") as they were supposed to be.
Upon inspection of the tiles, it was found that all the sizes varied
somewhat (which is reasonable - I am not expecting them to be all
perfectly the same, but it would be nice), but in particular the 18x18s
were the furthest off, ranging from 17 1/2" to 17 11/16", when they should
be approx. 17 13/16".
How can these tiles be laid to compensate for these size variations?
Should the installer be using several different spacer sizes and varying
the grout lines?
Any help appreciated!