How to Fix Cracked Grout in 7 Simple Steps

For grout that’s already loose and easy to remove, you can do it by hand. The more difficult-to-access pieces may require a grout saw. Slowly move the saw back and forth across the grout like you’re cleaning it. Continue doing this until the grout is in pieces, and you can easily remove it by hand.

You should always remove as much of the old grout as possible before adding a new layer. Otherwise, the newly applied grout won't bond correctly to the surrounding surfaces, creating an even bigger headache later on. Keep this in mind as you look at shower tile ideas because you’ll probably need to replace the grout several times while you own it.

Unless you’re replacing all of the grout in your space, you’ll need to find a replacement that is as close to the original color as possible. Otherwise, it will be very obvious where you regrouted.

You can get help by taking a piece of your old grout to a home improvement store. An employee might be able to color-match the sample to one of their products.

Use your shop vac, or if you don’t have one, the hose attachment on your vacuum to clean up all excess grout and any dust or debris. Go slowly up and down each area of the grout with your vacuum to clean the area. Once you clear the dirt and debris, you can determine if you need to go back to step one and remove more grout.

If you purchased a mixable grout, start by mixing the grout powder with water per the instructions. Read the instructions and product labels carefully to ensure you get the ratio correct.

Pour one fourth to one half of a gallon of grout over the tiles you’re regrouting. Use the rubber grout float, or putty knife if it’s a smaller section, to spread the grout evenly over the edges. Apply the grout in a sweeping circle motion to ensure it evenly covers the tiles and crevices.

Avoid putting too much grout on the tiles at one time. It’s better to start with small layers and add more as you go.

After applying the new grout, use the rubber grout float to remove the excess grout. Holding the grout float at a 45-degree angle, slowly drag it across the grout. This will clean up any excess and make the grout smooth. If you’re learning how to regrout floor tile, removing excess grout is an important step, as too much grout can create a tripping hazard.  

Whether you’re fixing the grout on your floor or walls, let it dry completely before walking on the surface or allowing water or other moisture to come into contact with it. Drying times can vary by product, but most grout requires 48 hours to fully cure.

An easy way to keep your grout looking its best–and prevent future cracks–is by sealing it. This step is an investment in keeping your grout looking its best for years to come, and reduce the risk of cracks, holes and mold. The cost to seal grout is minimal, and the return on investment is immense. 

Once your grout is dry, use one fourth cup of vinegar mixed with eight ounces of water in a spray bottle to wipe down the area. This step removes impurities and helps to disinfect the area. Be sure to wait the appropriate amount of dry time, per the instructions.

Apply a thin coat of the appropriate sealant with a sponge, quickly wiping away any excess before it dries. Apply between two to three coats of sealant, being sure to allow one hour of drying time between each layer. 

The type of sealant you use will vary depending on your type of surface. For example, your bathroom will probably see more moisture than your living room floor, so you want to make sure any sealant you use in the bathroom area has a waterproof component. Using sealant will increase you tile installation cost, but it is a necessary step.