https://tiledoctor.com/whats-the-difference-between-grout-and-caulk A sanded grout is normally a rigid cementitious grout and it should never be used at the transition from the floor to the wall. In those extremely rare cases where cracks develop in the grout in a corner, I thoroughly scrape out the old grout and completely clean the joint. MHI. If you are working with joints that are larger than 1/8 inch or are using caulk against sanded grout, use sanded caulk. The only thing sanded caulk is good for is an expansion joint in the middle of a floor, when you want it to look just like the grout. Opinions vary on whether grout or caulk should be used in the joints where two planes meet (e.g., floor and wall, or wall corners). Caulk is silicone, acrylic, or latex based, which is flexible and can help absorb movement, whereas grout can crack. Sanded Grout. It's like a 2-way street. Grout Additives improve the stain and water resistance of Keracolor® S and Keracolor® U. As its moniker suggests, sanded grout is held together with fine particles of sand. You said it was siliconized, so that suggests it was a resilient caulking, but not one that meets ANSI C920. i hate sanded caulk we never use it , it sucks, its hard to tool, unsanded caulk with sanded grout looks fine and the joints are so much more pleasant to the eye. Another consideration when choosing between sanded vs. unsanded grout is the tile material that you’re working with. To seal gaps up to a quarter-inch in width, apply sanded caulk that matches your grout. Caulk is used to waterproof joints for space like bath tubs, showers, windows etc. Caulk is strong enough to adhere to tile surfaces without crevices. Compared to traditional caulk, sand can be added for strength to create tighter holds on larger gaps and joints. 3. Grout Additives. For smaller projects that will not require added bulk, a simple unsanded caulk will work well. To minimize the chances for mold, I use nothing except 100% silicone caulk. Sanded grout contains silica sand and is best used for tile joints that are wider than 1/8 inches because sand particles lock together to form a strong joint. Caulk, on the other hand, which is frequently composed of silicone, does not allow water to pass through. Grout is designed for water to pass in and out of the joint. https://www.sirgrout.com/blog/what-is-the-difference-between-grout-and-caulk In addition to silicone, the TCNA recommends urethane or multi-polymer caulks. Sanded grout for floors and joints 1/8" or greater. ... Sanded, acrylic caulk with colors from Keracolor S. Keracaulk™ U. Unsanded acrylic caulk with colors of Keracolor U. Mapesil™ T. The 100% silicon caulking/sealants do meet ASTM C920 and will last a lot longer. Sanded Grout Can Damage Smooth Tiles . Then I run a bead of caulk in the corner. 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