Flooring and grout are the aesthetic backbone of your home, but daily wear and moisture can leave them looking tired or damaged. In this lesson, you will learn professional techniques to seamlessly patch hardwood or laminate floors and how to properly remove and replace old, stained tile grout.
Repairing damaged flooring requires selecting the right method based on the material's structural nature. For solid hardwood, minor scratches or gouges are typically addressed by filling them with a wax filler stick or a wood putty that matches the grain pattern. When dealing with deep dents, you can often "steam out" the wood fibers by placing a damp cloth over the area and applying a hot iron. The moisture causes the crushed cellulose to expand back to its original volume.
For laminate flooring, the process is trickier because laminate is a composite product with a photographic surface layer. You cannot sand or refinish it. For small chips, use a laminate wax repair kit, which allows you to melt different colored waxes into the damaged area to replicate the wood grain. If a board in the middle of a room is ruined, you may need to perform a "plunge cut." This involves cutting out the center of the board with a circular saw, carefully removing the remaining edges from the locking mechanism, and snapping in a new board using a specialized adhesive.
Always test your color match on a scrap piece or in an inconspicuous area, like inside a closet, before applying filler to the damaged spot.
Grout is essentially a mixture of cement, sand, and water. Because it is porous, it acts like a sponge, absorbing dirty water, soap scum, and oils over time. This leads to discoloration and, in worse cases, mold growth. When grout begins to crack or crumble, it is no longer providing a water-tight seal, which can potentially lead to water damage behind your tile.
To replace failing grout, you must first remove the old material. Using a manual grout saw or an oscillating multi-tool with a diamond-grit blade, carefully grind out the old grout. You should aim to remove at least two-thirds of the depth of the tile to ensure the new grout has enough surface area to bond securely. Avoid pressing too hard with the tool, as you risk chipping the edges of your tiles—a mistake known as "nicking the shoulder."
Once the joints are cleaned and vacuumed, you are ready to apply new grout. Sanded grout is used for joints wider than 1/8 inch to prevent shrinkage and cracking, while unsanded grout is used for thinner joints to avoid scratching delicate tiles. Apply the grout using a rubber grout float held at a 45-degree angle. Push the material diagonally across the joints to ensure they are packed completely full.
After the grout begins to set (usually 15–30 minutes), use a damp—not saturated—sponge to wipe down the tiles. This is the stage where most beginners fail; if the sponge is too wet, you will wash the pigments out of the joints, causing the grout to dry unevenly or "chalky." Clean the residual "haze" with a microfiber cloth after the grout has hardened.
Once your grout has cured for the time specified by the manufacturer (usually 24–72 hours), the most important final step is sealing. A penetrating grout sealer fills the microscopic pores in the grout, preventing liquids from soaking in. If you skip this, your hard work will start showing stains within months. For flooring, ensure that furniture legs have felt pads attached to prevent the scratches that lead to the repairs we discussed earlier.