Be aware of the tile you chose to use for interior water areas such as showers and commercial kitchens, ect Tile such as ceramic tend to have a high water absorption 3% and wont do as well as a porcelain tile that only carries a 0.5% absorption rate in most if not all of your durable porcelain.
N.E.TILE.CO prefers none porous tile in high rate water areas.
Ernestor Gonzales – OWNER OF N.E. Tile Company
What is porous tile?
To identify if you have porous tiles or stone, drop a small amount of water on the surface. If it is porous, water marks and darkening are visible after the floor is wet, leaving areas patchy and discoloured until they dry out.
Most natural stone is porous, some more than others. Porosity ranges from very high (sandstone) to very low (granite) or negligible (porcelain). The natural structure of stone has very open pores that allow the entry of moisture and stains deep into the stone.
Most stains are liquid-based and can contaminate the tile. Many stains, depending on the content (type and size of molecules) can penetrate several millimetres into the stone making it very difficult to remove. The more porous the tiles, the deeper the staining can go.