However, there are notable drawbacks and risks: Poor adhesion: If you choose to regrout over old grout, the new grout may not bond well to the old grout, leading to a less durable finish.
Yes new grout can be installed on old grout. Make sure the old grout is thoroughly cleaned and then wet before installation. I do this all the time. There is absolutely no need to start over and given the quality of the install you have had so far I would say that starting over might introduce more issues.
Removing the old grout is essential for the best results, as applying new grout over the old can lead to poor adhesion and reduced longevity. For cleaning, a non-abrasive paste made from baking soda and water works well, especially on enamel surfaces. Ensure the area is completely dry before starting to re-grout.
Whoever installed your floors most likely did not seal the grout because it needs time to harden and cure completely.
Q: Is regrouting worth it? A: Absolutely! Regrouting can give your space a fresh, updated look while also addressing any potential issues with cracked or deteriorating grout that could lead to moisture buildup or mold.
Do You Regrout or Retile? The average cost of tiling a shower is about $1,800–$5,000. Retiling a shower will be a few hundred dollars more once you factor in $2–$5 per square foot to remove the old tiles. Regrouting shower tiles costs significantly less, with an average price range of $700–$1,500.
If you've tried cleaning your grout and restoring it with a grout pen, but you're still unhappy with the look of the grout, the other option is to remove it and replace it with new grout. Check out our video with advice for re-grouting tiles.
Penetrating sealers are the most commonly used and offer high water, chemical and stain resistance. They provide protection without changing the appearance of the grout joint.
Epoxy grout doesn't need to be sealed at all.
Unsightly Grout Stains and Discoloration:
One of the most noticeable effects of neglected grout sealing is the gradual accumulation of stains and discoloration. Grout is porous by nature, which means it readily absorbs liquids, dirt, and debris.
Grout pens will only temporarily cover your grout's discoloration. That's probably why they are the cheapest option available. We run into the infamous grout pen issue nearly every other week. The project usually goes awry when the homeowner applies the grout pen to the grout and some bleeds over onto the tile.
Start by sprinkling baking soda liberally along the grout lines. Use a brush to ensure that most of the baking soda covers the dirt and grime thoroughly. Then use a sprinkler bottle to sprinkle cleaning vinegar over the baking soda while taking special care to dampen the powder along the entire grout line.
A dedicated grout rake or a Stanley blade is best for removing existing grout. Grout rakes can be both mechanical and electric. Any electric grout rake is usually 240V and has variable speeds. The Rubi Grout Remover helps to remove grout surrounding ceramic and porcelain tiles.
The grout should be dug out a minimum of 3mm deep (preferably deeper) so that new grout can have a firm base and a larger surface area of the sides of the tiles to adhere to. Do not attempt to apply new grout over the damaged existing grout.
Davco Rejuvenation Grout is a premixed, ready to use grout designed to be applied straight over existing grout. Suitable for joints 1-5mm wide and a maximum 5mm depth. Davco Rejuvenation Grout is fast and easy to use an is stain, mould and bacteria resistant.
First, remove all loose and cracked grout with a grout saw or Dremel tool. Apply the caulk gently to the cracks, smoothing it down with a plastic spoon. You can also wet your fingers and smooth the caulk by hand. Make sure you allow the caulk to fully cure for at least 48 hours before you walk on the floors.
Any type of material can be susceptible to cracking if not sealed correctly. This will keep moisture out to keep the grout from deteriorating.
Standard grout isn't waterproof at all, only epoxy grout is. You can seal regular grout after it dries, but you have to do it every so often or else the grout will begin to absorb water again.
The Drawback of Using Grout Sealer
Moisture can still pass through most sealers, meaning grout isn't entirely waterproof even when sealed. Over time, grout in areas like bathrooms will naturally stain or show signs of aging, regardless of sealing.
It is important not to leave any excess sealer on the tile surface because it won't get absorbed and it can leave a sticky surface that can become a maintenance problem.
Adding new grout over compromised grout won't address the underlying issues and could lead to further deterioration. Ensuring the old grout is clean and free from contaminants is essential for a successful regrouting project.
Excess Grout
Grout protruding from between your tiles is a clear sign of an amateur or rushed installation job. If the grout hasn't fully hardened, you can scrape it out with a wooden, preferably oak, stick. This will remove the grout without scratching the tiles.
ANSWER - It is possible to grout over existing grout if there is enough depth to do so. 1/8 inch depth may or may not be adequate depending on the type of grout used. A latex modified grout may work, but you have to properly clean the existing grout to ensure the new grout adequately bonds.