is the process by which the surface is aggressively sanded to remove large stocks of the stone. This process is usually recommended when
stone tiles are uneven.
is the term given to uneven tiles that are set higher than one another. Grinding is recommended when the lippage exceeds2-2mm or if one desires to have a completely flat floor.
There are some very good reasons for grinding a stone floor flat. A flat floor is easier to maintain;since there will be no lips where dirt can
accumulate. The grinding process, if performed correctly, will also eliminate depressed grout joints—the grout will be even with the tile's
surface so that dirt and grime can't accumulate. A completely flat floor eliminates all unevenness, giving the floor the illusion of being monolithic (one piece).
Note: a stone floor does not necessarily have to be ground to remove scratching. A skilled craftsmen can repair it without grinding.
Just as there are several good reasons for grinding, there are also some disadvantages. Grinding is very time-consuming and expensive; with some hard stones, like granite, it can take an entire day to grind 50 square feet. The grinding process is also very messy. Copious amounts of water are needed to grind a stone floor and produce a heavy slurry of stone and water. If adjacent areas such carpet,
wallpaper, skirtingboards, etc., are not protectedproperly, water damage may occur.
Before deciding on grinding, all the above considerations must be carefully weighed.