For twenty four by twelve inch large format kitchen floor tiles use a one quarter inch notched trowel and grout joints between one eighth and one quarter inch for reliable adhesion and movement accommodation.

For thinset apply a medium bed mortar when tile backs are uneven or when substrates are not perfectly flat to avoid voids under large format tile, but for consistently flat substrates a high quality polymer modified thinset applied with a one quarter inch notched trowel will typically provide sixty to eighty percent contact which is the minimum for floors and higher contact is better. Back butter large format tiles when practical by troweling a skim coat on the tile back and then combing with the same notch size to ensure full bed contact and eliminate air pockets. Check flatness with a straight edge and correct any subfloor deviation over one quarter inch in ten feet by patching or self leveler; large format tiles are less forgiving of dips and lippage. When mixing thinset follow manufacturer water ratios and open time guidance, mix to a creamy peanut butter consistency and do not retemper after initial set begins, which weakens bond strength. For grout joints choose a flexible cementitious grout or a grout mixed with an elastomeric additive for floor movement and select sanded versus unsanded based on joint width and tile porosity, remembering sanded grout is for wider joints. Always perform a mockup of a small area and let the mortar cure before grouting to verify adhesion and that the tile sits flat and level.

The most common mistake is insufficient mortar coverage leaving voids under tile which shows up as hollow sounding tile and leads to cracking; fix this by back buttering large tiles and checking coverage with a random sample break out and correct technique before proceeding. Another frequent issue is improper joint width or sealing where joints are too narrow and grout cracks as the floor moves; mitigate this by following manufacturer recommended joint width which is typically one eighth to one quarter inch and using a flexible grout or caulk at perimeter transitions. People also often ignore substrate flatness and attempt to skim thinset thicker than recommended which causes bedding failure; correct this by repairing the subfloor with a proper patch or self leveling compound so the thinset sits at recommended thickness and use a medium bed mortar if necessary.

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