For example, if you have cracks in your grout, a simple fix could be to use some caulking to fill those cracks in. Use a grout or rotary saw to get all the cracked grout out, and then just caulk the cracks in and smooth it over. You'll need to let the caulk cure for 48 hours to ensure it has properly set.
Grout can crack when there's too much water mixed into the grout, which create tiny pinholes. When the grout dries, these pinholes make it easier for cracks to form in the grout. Too much water in grout can make the grout weaker. Grout can crack due to thinset (glue) that is applied over the mortar during installation.
The installer might have mixed too much water in with the grout or used too much water at that spot in the floor when dressing the joint. Or the grout itself could have been bad. To increase your chances of a repair that lasts, I recommend that you carefully chisel out as much of the grout as possible.
At this point you may wonder if a complete re-grout is necessary or if it would be possible to simply put new grout over old grout. The answer is, yes, it is possible to put new grout over old grout.
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.
Grout needs to be sealed. It's naturally porous and will stain easily. Most installers of tile floors do not seal them because grout has to cure first. It's something you should do to keep your grout looking its best.
ANSWER. 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.
Too Much Water in the Mix
If the installer mixes too much water in the grout, or uses too much water while dressing the joint, the grout may fail.
As mentioned, silicone works well in places where shifts in pressure can cause your grout to crack. For most bathrooms, this means using it as a sealant for the joints of the shower tray and the bath.
If you try adding new grout over your old grout, the new mixture will not properly adhere to the existing grout or tile edges, leaving your shower open to water damage.
The first possibility is that there was an improper amount of water mixed with the grout when it was mixed. When too much water is added, it begins to create an issue with the bonding of the substance. Instead of holding strong, it will begin to become crumbly and start to fall out within only a few months.
If the grout is runny and can be poured like a milkshake, too much water has been added. You can fix the problem by adding more powdered grout and blending the mixture until the grout thickens. This is why I always mix only part of a bag of grout at one time.
Grout sealers will break down over time, so you're going to have to reseal grout on a floor every three to five years. Shower grout should be resealed once a year. Always clean grout carefully before doing this resealing.
Grout doesn't last forever. You can expect a lifespan between eight and sixteen years. Its lifespan will vary depending on how you treat your shower. Odds are, you have no idea when your grout was installed.
Tiling is a great way to improve your home, but you may have to replace grout every 8-10 years. However, this is something that you can do on your own! If you are regrouting tile, it is vital that you use professional tools and materials.
Grout is porous and therefore absorbs liquids. Because of this, the reason you should not seal your tile grout is that the sealer's liquid chemicals combine with the grout to create a surface that is actually much more difficult to clean.
To maintain the integrity of grout, you will have to apply a grout sealer. It is necessary to apply the sealer after 1 to 2 years so that the grout remains intact and waterproof. Sealing grout is necessary because it without a waterproof covering it absorb not just water but bacteria and stains as well.
Seal the tile, not the grout
Many tiles - especially natural stone such as slate, marble and limestone - are porous and need to be sealed. (Note: porcelain and ceramic tiles are not porous.) You have to seal natural stone tile before the grout is applied, however.
So, do grout pens work? The answer is yes. They are a great way to temporarily bring back the color and shine of dirty, stained grout between professional tile cleanings. They're easy to apply and dry fast, so you can return to enjoying your tiled surfaces in no time.
An oscillating tool removes grout without harming the tile because the grout is much softer than the tile. However, it is possible to damage the tile if you press too hard or for too long. Work carefully and keep your eye on the blade.
Regrouting a bathroom shower or tub stall may seem difficult, but it really is just grunt work. The process is relatively simple and an entire shower regrout can usually be finished in about a day – even by someone who has never grouted tile before.