Maintain perfectly straight grout lines by establishing a precise layout and keeping the first row flawless.

Start by dry laying tiles along the planned field to determine the best placement and avoid narrow slivers at edges. Snap chalk lines on both axes from true reference points such as a centered wall or a long straight edge and use those lines to align each tile as you set it. Use consistent tile spacers made of rigid plastic and choose the spacer width that matches your design gap, then remove them only after the thinset has cured enough to hold tiles in place. When bedding the first row, apply thinset with a notched trowel and back butter the tile if needed to ensure full contact and prevent lippage which can shift alignment. Frequently check alignment with a long straightedge and a level, tapping tiles lightly with a rubber mallet to correct lateral or rotational drift before the mortar skins over. Keep a small gap of mortar at joints rather than overfilling so that spacers seat fully and are not forced out as you press tiles together.

Three common mistakes are starting without a reference layout which leads to cumulative error, using inconsistent or flexible spacers that compress under pressure, and failing to correct the first row which makes every subsequent row skew. If you start without a layout, stop, dry lay a row and snap permanent chalk lines tied to a true corner or center line so each tile has a reliable guide. If your spacers are inconsistent or bending, replace them with thicker rigid spacers sized to your grout joint and use corner clips or wedge spacers where needed to maintain pressure control. If the first row is off, remove and reset those tiles or lift and relaunch the layout rather than forcing later rows to conform, because a corrected base prevents cumulative deviation.

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