Widen grout joints with large format tiles to accommodate slight size variation and prevent edge stress that leads to cracking.

Large format tiles are less forgiving of cumulative placement errors and slight manufacturing size variation, so setting grout joints wider than you might with smaller tiles reduces installation stress and improves long term performance. Aim for a joint width of three sixteenths of an inch when using rectified or calibrated tiles that still have minor size variation, and use consistent plastic or wedge spacers during dry layout and bedding to hold that width uniformly while the adhesive cures. Adjust trowel size and notch profile to ensure full mortar coverage beneath each tile at the chosen joint width; for large tiles use a larger notched trowel and back butter the tile when needed to prevent hollow spots. Choose a grout with appropriate flexibility and low shrinkage for wider joints, and mix to the manufacturer recommended consistency to avoid excessive water that weakens the joint. When grouting, tool the joint to compact the material and remove voids, then clean before the grout skins to maintain crisp edges and intended width. Seal grout where appropriate after full cure to reduce staining and help joints retain their intended appearance.

Common mistakes include setting joints too narrow which allows small placement errors to bow tile edges and create point loads, so increase to three sixteenths of an inch and use spacers to keep it uniform. A second issue is inadequate mortar coverage under large tiles which causes hollow spots and eventual cracking, so use a larger notched trowel and back butter tiles when necessary to achieve full contact. A third problem is choosing a rigid grout for wider joints which can crack as the assembly moves, so select a grout rated for movement tolerance and follow proper mixing and curing times to preserve flexibility.

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