Ceramic tile grout not only helps in keeping the tiles together, it also protects the tiles from chipping and acts as floor's protective barrier from dirt and water. Repair it immediately when it chips or cracks to prevent water from causing damage to the floor and the tiles.
Step 1 – Determine the Grout Color
There is a variety of grout colors to choose from; unlike before that grout colors are in the white to gray range only. But this makes the selection a bit challenging, especially since you only have to re-grout a certain portion of the tiled wall or floor. The new grout must blend perfectly with the old grout color (and keep the uniformity in color).
Clean the area with oxygen bleach to reveal the color of the old grout. Wet grout is darker in color. Let it dry to see its true color. Then drill or chisel the area and collect grout sample. Bring the sample to the hardware store and purchase grout that match the color and shade of the sample.
Step 2 – Prepare the Area
Now that the area is clean, continue the earlier drilling or chiseling of the old grout. Drill around the area that you think needs a re-grouting, even if it is not cracked or chipped.
Use a motorized rotary tool using a slim head for quicker preparation or do it manually with a hammer and a chisel. If you plan to prep the area with the former, you still have to use a hammer and a chisel to remove grouts that are attached to the tiles. Do this task with a light hand to avoid damaging the ceramic tiles.
Vacuum to remove chipped grout. For pulverized grout, brush it away with a paintbrush. Ensure that the area is free from debris. The cleaner the area, the easier it is for the grout to hold onto the surface of the floor and the edges of the ceramic tiles.
Step 3 – Apply Grout
Mix the grout with water using the exact proportion. Grout mix has a detailed instruction on how to form a grout paste; follow this to a T. Grouts will not last long if they are mixed using wrong proportions.
Using the rubber float, apply the grout in a 45-degree angle. This angle helps in filling up the deep, hard-to-reach, or pocket-like areas. Continue filling up the area until the grout overflows. It is alright if grout overflows to the tiles’ surface. Just use a wet sponge to take off grout overflow.
Step 4 – Clean the Tiles
Let it dry for 2 hours. Wet an old rag and clean the surface of the tile for more grout smudges. Use a dry rag to polish the tiles.
The color of the grout will initially look a shade darker than the old grout. Just allow the area to dry for 2 to 3 more days and its true color will show to match the color of the old grout perfectly.