Why is it significant to use the right notched trowel size?

Using the correct size of a notched trowel is essential for achieving optimum coverage and ensuring proper bonding between the tile and the substrate. The notches in the trowel create ridges of adhesive when applied to the surface, and the size of these notches determines the thickness of the adhesive layer.

If the trowel is too small, there may not be enough adhesive to support the tile, potentially leading to weak spots or insufficient bonding, which can cause tiles to pop loose over time. Conversely, if the trowel is too large, it could lead to an excessive amount of adhesive that may ooze out around the edges of the tiles or create an uneven surface when the tile is pressed down. Consequently, achieving the right balance with the notched trowel size ensures that each tile has adequate support and full contact with the adhesive, which is vital for long-lasting installation.