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After tile is installed, the next step is grouting the gaps between tiles. This task is less time-consuming and labor intensive than installing tile, but it’s even more important than making sure all your tiles are straight and look nice. Doing a proper grout job will ensure that the floor under the tile stays safe from moisture. You will still be working on your knees for an extended period of time, so it’s not a job to take lightly. To get started on the right foot, start below with Step One.
If you’re re-grouting an old tile surface, remove the old grout. You can remove the old grouting compound with a grout saw or a grout removal bit in a rotary tool. Make sure this is fully removed before proceeding.
See more at: http://www.wikihow.com/Grout-a-Tile-Floor