The first step is to remove the existing grout from between the tiles. Depending on the amount of damaged grout and the width of the grout joints, there are a few different tools to consider.
For smaller jobs with 1/4-inch or narrower grout joints, you can get by with a grout rake, which is a small hand tool that has a steel blade covered with super-sharp carbide grit. Simply pull the tool along the joints to “rake” out the grout. In most cases you don’t have to remove every bit of grout. Removing about half of the grout is usually sufficient as long as the remaining grout is in good condition.
For larger jobs—say, more than about 30 square feet—or for grout joints wider than 1/4 inch, you need the speed and muscle of an electric tool. There are several motorized tools available for removing grout, including grinders, rotary tools, even reciprocating saws. However, the best tool for DIYers is an oscillating multitool fitted with a carbide-grit grout-removal blade. Because the multitool blade oscillates and doesn’t spin at high speeds, it’s much easier to control than most other tools. Plus, multitools are lightweight and feature compact, easy-grip handles. Say Popular Mechanics.
This video will show you the tools and the proper procedure for removing your grout easily.
after you’re done removing all the grout from between the tiles, you need to use a shop vac to get up all of the dust and debris. And then do a complete cleaning on your tile, anything left on the tile the grout will stick to, and be hard to get off.
Now that you have all the grout removed and cleaned up, you need to install new grout. The video below will walk you through the steps to properly grout tile.
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