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Glossary
There are basically two kinds of grout: cement-based grout and epoxy grout.
Cement-based grouts (Sanded and Non-Sanded Grouts)
Cement-based grouts vary in the additives that they contain. Some come precolored, or can have coloring pigments added. Commercial cement, dry-set, and latex cement are all cement-based grouts. If, when you run your finger along a grout line, you feel the grains of sand, and your grout joints are at least a quarter-inch wide, then you have sanded-grout. If, on the other hand, you have very narrow grout joints that feel like a smooth cement surface, then you have non-sanded grout.
Cement grout creates a dense, uniformly colored cement that is resistant to water but not waterproof or stainproof, so we always recommend a sealer. Dry-set grout contains additives that increase water-retention, and latex cement grout is created when either cement or dry-set grout is mixed with powdered or liquid latex. Even with this added protection, we would still recommend sealing the grout.
Epoxy Grout
Epoxy grout is the most expensive grout and typically used for commercial properties. An epoxy resin and hardener are contained in this grout which increases the chemical resistance, the impact resistance, and the strength of the bonding to the tiles. A finished epoxy seal is very smooth to the touch, but is rarely used in a residential property. When installing an epoxy grout, the area must be well ventilated, and the technicians must wear respirators.