Which tile sizes require staples along each flanged edge?

• A. 16x16 and 12x12
• B. 16x16 only
• C. 12x12 only
• D. Neither

Answer: (A)

Large-format tiles have more edge length that can be pulled or shifted as the setting material cures. The flanged edge is the part of the tile edge that can catch and misalign with neighboring tiles if it isn’t held steady. Placing staples along each flanged edge provides a mechanical hold that keeps the tile flush with the substrate and maintains straight grout lines while the adhesive sets. This extra restraint is especially important for tiles like 12x12 and 16x16, which are big enough to move or tilt more easily than smaller tiles. Smaller tiles don’t need this extra fastening because the adhesive alone is usually sufficient to keep them in place during setting.