Replacing Old and Unsightly Grout

By Nick Cumberland

The use of tile is a beautiful way to enhance your home. It isn't just for the bathroom anymore. It is a very attractive way to add interest, color, and distinction throughout the house. Unfortunately, the maintenance issue of keeping the grout clean can be a real challenge.
Grout is porous, and it tends to absorb everything it is exposed to. Tile is a snap to keep clean but grout is a very different story. It can crack, leaving unsightly gaps which can also allow moisture to penetrate between the tiles. When this happens, you must remove the old grout and replace it.
Getting old grout out of the seams
Once grout has been applied, it becomes like cement and removing it can be tricky. In order to get the best results, you'll need to remove as much of the old grout as possible. Getting it out is a big job but the results will be well worth the effort.
Grout removal options
Use of a hammer, and cold chisel, or old flathead screwdriver is the old tried-and-true way to chip out grout. The chisel or screwdriver is held at a 45-degree angle, using firm pressure and a steady hand. It is a tedious job, but patience will insure good results.
Another option is the grout removal tool. It is a metal rod with a triangular shaped carbide head and a diamond cutting blade on the tip. This is relatively inexpensive (probably less than $20) and available at most home improvement stores. Steady pressure on the tip of the blade will cut through the old grout. You must take special care because if the tool slips, it will most likely damage the surrounding tiles.
The most expedient way to remove grout is with a rotary tool ( Dremel is a very good choice) You can purchase a grout attachment that will cut down your work time considerably. The only drawback in using a rotary tool, is that it will produce quite a bit of dust as it breaks up the grout. Once again, a steady hand is very important.
ALWAYS remember to wear safety glasses and it is advised to use a mask as well

Application of New Grout
Note! The surface must be smooth and as clean as possible before the new grout line is applied.
1. Follow package directions when preparing the new grout. (Be sure to use a mix without sand if you have grout lines of 1/8" or less). The consistency should be similar to icing when mixed properly.
Using a rubber-backed grout float, apply the mixture working across the grout lines at a 30 to 45 degree angle. Be sure to press the grout well into the cracks, (if there are some places the float can’t get into, use your hands).
When all the lines have been filled, hold the float at a 90-degree angle and wipe away the excess grout, leaving the lines smooth and even.
Fifteen minutes is usually enough time to let the new grout set. Dampen a sponge with clean water, and wipe down the entire surface a few times. Continually rinse out the sponge during this process.
It may be necessary to “touch up” a spot or two, which is easily done at this point while the grout is still soft and pliable.
The last step is a final wipe down of the tiles. It will take a few days for the grout to cure and you have the option of applying a sealer for added protection.