When grout needs repairs, the only way to accomplish the job is to replace it. Since grout is made up of a cement, digging it out by hand can take a great deal of time and energy. If the grout you plan to remove is covering a large area, using a power tool with a grout removal attachment makes the most sense.
Dremel Grout Removal Tools
Dremel makes effective tools to remove grout: a grout removal specific tool and attachments which aid a standard Dremel grinder. Both tools work in similar ways; a carbide bit is placed at the tip of the tool, which sits at an angle to the grout. You can adjust the depth of the tool, allowing it to dig down as far as necessary without scratching or harming the substrate. Special side protectors allow you to adjust the width of the tool to avoid scratching the tile.
Grout Grabber and Reciprocating Saw
If you have a reciprocating saw, an attachment called the Grout Grabber will turn your saw into a grout removing tool. The Grout Grabber is a small, toothed attachment that fits onto the end of your saw. It does the job of manual tools, grabbing and digging into the old grout without the time and arm power.
The blade is very thin, so wide grout joints will require several passes with the saw to remove all the grout. The blade may also wear out quicker than other tools, requiring replacement frequently in large jobs.
Roto-Zip With Attachment
A Roto-Zip is a handheld tool used for cutting drywall and making openings for electrical boxes. A special attachment with a carbide bit allows you to use it to remove grout from tile. The side of the blade does the job with the Roto-Zip; pay attention to the edges of the tile to avoid scratching them. Roto-Zips are ideal for large jobs since they work faster than a Dremel and don't wear out as quickly as a Grout Grabber.
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