Remove the countertops. From inside the base cabinets, unscrew the screws holding the countertops to the cabinets. Unscrew take-up bolts on mitered sections of the countertop. Use a utility knife to cut through the caulk, if present. Countertops should lift off easily, but if they don’t, you can use a prybar to carefully pry them away from the base cabinets. Note: In some cases you can install these tiles over old laminate countertops.
Prepare and install the subbase. Measure the cabinet bank from outside edges to outside edges on all sides and cut a piece of 5⁄8"-thick exterior grade plywood to fit. The edges of the plywood should be flush with the outside edges of the cabinet tops. Screw the plywood to the cabinet braces from underneath.
Make the sink cutout. To create cutting lines, place the sink upside down in the desired location. Trace the edges of the sink and remove it. To create support for the drop-in sink flange, use a compass to trace new cutting lines inside the traced lines (usually 5⁄8"). See the manufacturer’s instructions to confirm dimensions (some sinks come with a template for making the cutout. Use a jigsaw to cut out the sink opening.
Install the tile underlayment. Granite tile, like ceramic tile, requires a cementboard or denseboard underlayment layer. Cut the material to the same dimension as the plywood subbase and lay the cementboard over the plywood with the edges flush. From inside the sink base, trace around the sink cutout with a marker. Remove the underlayment and make the cutout with a jigsaw.
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