Tile grout is designed to last a long time, but it doesn't last forever. Long before grout begins to physically deteriorate, it will become discolored and unattractive.
While grout discoloration is an inevitable part of having tile flooring, walls, backsplashes, or counters, few homeowners ever want this or want to deal with it. Grout discoloration happens because of mold and mildew, as well as dirt that imperceptibly collects in the grout joints over time. No matter how religiously you seal the grout and no matter how much you scrub the grout, you are bound to end up with dingy, discolored grout. Whether you have tile grout problems or you simply don't like the color of your grout, it is possible to change the color without tearing out all of your tiles.
How Do You Change Grout Color?
Whatever your motivation, it is possible to change grout color in either of two ways. You can either remove and replace the grout with new grout of a different color or you can apply a colorant to darken or lighten your existing grout.
Remove and Replace Grout
The most thorough and complete solution is to remove the grout and install new, grout in the color of your choice. In small areas, such as backsplashes and tub or shower surrounds, this project can be less difficult than you might imagine. If the grout is crumbling or otherwise physically in poor shape, you gain the added benefit of all-new grout that keeps the cement board and studs behind the tile dry and in good shape.
Coloring the Grout Lighter or Darker
Most homeowners would like to avoid removing grout if at all possible. One way to bypass the work and mess of removal is to preserve the grout but change its color. Grout can be colored with dyes after it has been installed. This is a good choice if the grout is stable and solid.
Keep in mind that with existing grout, you get the best results when changing to a darker color. You can lighten the grout color, but more layers are required and results might be less than satisfactory.
Equipment / Tools
- Electric multi-tool
- Grout saw
- Old screwdriver
- Utility knife
- Shop vacuum
- Plastic sheeting
- Painter's tape
- Latex or nitrile gloves
- Grout colorant
Changing Grout Color by Replacing It
Remove Old Grout
Remove the old grout with tools such as an electric multi-tool fitted with a tile blade or a manual grout saw. Use a small flat-blade screwdriver and a utility knife to clean up the tile edges and get into tight spaces.
Be sure to check that tiles are securely attached to the substrate. Tap on the tiles with the plastic backside of a screwdriver. If there is a hollow sound compared to most of the tile, that tile should be replaced. Moving tiles are often the cause of crumbling grout and re grouting will not fix the problem.
Remove Grout Particles
Remove the grout particles from between the tiles, using a shop vacuum with a flat nozzle attachment.
Choose New Grout
Choose a new grout that is suitable for the tile installation. As a general rule, unsanded grout is used for grout joints under 1/8-inch wide, while sanded grout is used for joints 1/8-inch wide or wider.
Add Pigment to Grout Mix
Add the pigment to the grout mix, if desired. Grout comes in a fairly broad range of factory-mixed colors, but you can create a custom color with powdered grout pigment or liquid grout dye.
Mix and Apply Grout
Mix and apply the grout, following the manufacturer's directions. Grouting is a three-step process of filling the joints, removing the excess, and cleaning the tile faces.
Seal the grout, if desired, after it has fully cured. The sealer helps protect the grout from stains and discoloration, but it can prevent you from changing the grout's color in the future. Be aware that sealant slightly darkens grout and gives it a shiny appearance.
Changing Existing Grout Color With a Colorant
Inspect the grout to make sure it is suitable for coloring. Grout colorants require porous grout in order to accept the colorant, along with glazed tile surfaces to prevent staining the tile. If the grout has an intact sealer, it will not be porous enough to accept colorant. Any grout that easily sheds water is not appropriate for grout coloring.
Find a spot that is less noticeable to test the colorant on the tile. It may discolor the tile and a different colorant or re grouting may be required.
Clean and Rinse Tile and Grout
Clean and rinse the tile and grout thoroughly, and let it dry completely.
Tape Off Tile
Tape off the tile with painter's tape, if desired. This is an optional step but is recommended by many tile professionals. Taping off the tile is the best way to prevent staining. Be aware that you can tape off and work on only a limited section of tile at one time.
Apply Grout Colorant
Apply grout colorant with a special grout brush or a pen loaded with grout dye, following the manufacturer's directions. Work in small sections at a time.
Wipe Off Excess Colorant
Wipe off any colorant that gets onto the tile faces as soon as recommended. Some products can be scrubbed off of tile as long as two hours later with a nylon-faced sponge, provided the tile is well-glazed. Follow the manufacturer's instructions carefully.
Let Grout Dry
Let the grout dry completely. Add a grout sealant, if desired. Again, the sealer will make the grout look darker and shiny.
When to Call a Professional
While regrouting tile is not complicated, it is a tedious, exacting job that requires a great deal of patience. If you feel that you cannot do an adequate job, tile installers generally will agree to take on regrout projects.