I am installing a kitchen countertop using 4×4 ceramic tile. I bought a “tile-in” sink which has a 3/8″ lip that I must tile up flush to. My problem is that using a 1/4″ notch trowel I’m about 2/16″ lower then the lip of the sink. Can I use 3/8″ trowel to raise the thinset so I can meet the lip of the sink or will I run into problems with the thickness of the mortar of 3/8″ filling in between the tile grout space when I push the tile into the thinset. How much contact do I need between the tile and thinset? Maybe I can make the 1/4″ thinset work if I barely lay the tile into the thinset without pushing it down for contact. Any advise besides hiring a professional. Thanks for your help
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