What is the average size of a floor joint?

1/4"

Will grout stain?

Yes, even though grouts are very dense, they are made of cement and cement is absorbent.

What can be done to cut down on potential grout staining?

The best way is to select a darker colour grout which isn’t always desirable. Another way is to use a grout protector, which is a sealer that is applied to the grout two weeks after installation. This will reduce staining.

What does a grout protector do?

It fills up the open air cells of the grout, making it less porous and less apt to stain.

How can grout haze, or a thin film of grout residue, be removed from tile?

Light grout haze can be removed by cleaning the tile with a nylon scrub pad and water. Heavier grout residue may need addition of an acid such as HG extra.

What aesthetic effects will the grout colour that closely matches the tile, have on the area?

It will give the area a unified blanket look as it will blend into the tile.

Under what circumstances do you use sanded and un-sanded grout?

When wide grout joints are used, usually on floors or rustic stone on any surface, sanded grout is recommended. If an un-sanded grout is used in a large grouted space it will shrink and crack since there is no sand in the grout. Un-sanded is recommended for small grout joints or when working with glass and polished stone. Otherwise, the sand in the grout would scratch the tiles.