I hope you will succeed in your DIY project! The longer you wait the harder it will be to get the new to stick to the old, though. 1. Re-grouting is not as difficult as you might think. And the answer is yes, yes you can. You most likely will need to use a grout saw and remove any loose grout and some near the empty space of the grout. You can then fix your loose tile by prying it up and using the same grout and adhesive above. "Grout can shrink while it is drying, and you may notice some grooves that have small gaps at the edges. unsealed tile grout appears rough, with a cement-like texture. Update the look of your tiles with Starlike grout in no time. Hello, I have just had my bathroom done 2 days ago by a professional tiler. Grout bonds mostly to the tiles, less so to itself. Bleach and disinfect the Grout. If you have started to notice your grout chipping or crumbling away, you may wonder if you have to tackle the chore of removing the grout completely or if you can simply apply new grout over the old stuff. While it's possible to apply new grout over existing grout, the results are usually less than satisfactory.Since the layer of new grout would be very thin and vary in thickness, it may not adhere well and the old grout could show through. The bleach kills existing mold particles. Also, if possible try to make those 90 degree joins where there's more tile to adhere to (avoid starting a new grout … Don't be frustrated - it's fairly normal to have to do this twice. I think if you just dampen the grout you can go over it with new grout. It will always remain two seperate layers. Also, it minimizes the chances of mold growing in that area in the future. Over the years I learnt that when it comes to renewing grout, it is always best to remove the old remains before you lay new ones. You can safely put new tile grout on top of old unsealed tile grout, but attempting to do the same with sealed grout will not work. Click to read More. When you are shopping you may want to inquire as to whether they carry any non-shrinking grout. Click to see full answer Considering this, can you put grout on top of old grout? It may be possible to apply new grout over old grout without removing it at some places. You may not need to remove most of the grout. If you dig the grout out, try to do it at a 90 degree angle to the "proper height" grout, this will give you the best adhesion for your patch. Removing grout from a tile floor is not nearly as difficult as it used to be. Will it be OK to go back over it with fresh grout. New tile grout will not stick to tile grout that is sealed. Attempting to grout over the top of old grout is simply stacking two seperate layers of grout. If this is the case, you need to repeat the application step. From what you's written, I believe that your contractor did a lousy job and didn't even sealed the grout. When he has finished the grouting it looks like he has washed too much grout out of the joints. Tile Your World , the Book -- also, The Kerdi Shower Book And at last, Tile Bathroom Remodeling: From Tear-out to Trim-out Once you do this, you can refill the area with grout using a grouting float. A new coat of grout can give your space a fresh look with the added benefit of protecting the surface. However, where the grout has deteriorated heavily through crumbling or become too dirty, it is best to remove it before applying new grout. The second reason is no matter how much of the old grout you may take out to install new, if you do not fix the actual reason the grout failed in the first place, eventually the same thing will happen again. If you must caulk over sealed grout, then we suggest you clean the grout. To do this, use a mixture of bleach and water. 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