06-25-2005, 09:20 PM. https://www.sirgrout.com/blog/what-is-the-difference-between-grout-and-caulk Unsanded grout has no sand, is thin and sticky, making it suitable for tile joints less than 1/8-inch-wide such as backsplash and vertical shower walls. Sanded Grout. Sanded grout for floors and joints 1/8" or greater. Then I run a bead of caulk in the corner. ... Sanded, acrylic caulk with colors from Keracolor S. Keracaulk™ U. Unsanded acrylic caulk with colors of Keracolor U. Mapesil™ T. 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. If the crack is up to a half-inch in size, you’ll need to apply two side-by-side beads of caulk to fill the hole and then join them when you smooth out the caulk … Grout vs. Caulk. You said it was siliconized, so that suggests it was a resilient caulking, but not one that meets ANSI C920. Caulk is silicone, acrylic, or latex based, which is flexible and can help absorb movement, whereas grout can crack. 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. https://tiledoctor.com/whats-the-difference-between-grout-and-caulk Caulk, on the other hand, which is frequently composed of silicone, does not allow water to pass through. The harsh aggregate material present in sanded grout can damage delicate materials such as granite, marble, limestone, and other soft stones. Sanded Grout Can Damage Smooth Tiles . 3. Sanded grout can work a lot like sandpaper. Grout Additives. Another consideration when choosing between sanded vs. unsanded grout is the tile material that you’re working with. If you are working with joints that are larger than 1/8 inch or are using caulk against sanded grout, use sanded caulk. To minimize the chances for mold, I use nothing except 100% silicone caulk. For smaller projects that will not require added bulk, a simple unsanded caulk will work well. The 100% silicon caulking/sealants do meet ASTM C920 and will last a lot longer. Grout Additives improve the stain and water resistance of Keracolor® S and Keracolor® U. In addition to silicone, the TCNA recommends urethane or multi-polymer caulks. To seal gaps up to a quarter-inch in width, apply sanded caulk that matches your grout. 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. A sanded grout is normally a rigid cementitious grout and it should never be used at the transition from the floor to the wall. Caulk is strong enough to adhere to tile surfaces without crevices. 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. 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