What are the functions of a grout float and a margin trowel during grouting?

• A. Grout float cuts tiles; margin trowel grinds edges.
• B. Grout float dries grout; margin trowel applies sealant.
• C. Grout float measures joints; margin trowel polishes edges.
• D. Grout float packs grout into joints; margin trowel cleans edges and removes excess grout from corners and around outlets.

Answer: (D)

Grouting relies on shaping and removing grout in just the right places, so you get solid joints and clean lines. The grout float is the tool you use to pack grout into the joints. Its dense, rubber face lets you press and slide grout into every joint, forcing out air pockets and ensuring a full, even fill. As you work, you’ll also skim the surface with the float to bring down excess grout from the tile faces, helping to keep the surface smooth as the grout begins to set.

The margin trowel complements this by handling tight spots and edges. Its narrow blade fits into corners, along borders, and around outlets or fixtures where a larger float can’t reach. With it, you can clean edges and scrape away any grout that has squeezed into seams or corners, producing clean, crisp lines around the perimeter of the installation.

So, the grout float’s job is to pack grout into the joints, while the margin trowel excels at cleaning edges and removing excess grout from corners and around outlets, giving you a neat, professional finish.