To install kitchen countertops, measure the dimensions of the area, and cut the countertop accordingly. Make a cutout on the countertop for the sink, and affix the countertop to 2-by-4 boards. Level the kitchen cabinets, install the countertop over them, and seal the gaps. Finally, install the sink inside the cutout.
Begin installing the kitchen countertops by leveling the cabinets. To do this, pry out the toekick of the cabinets using a screwdriver. Also, take the drawers out. Using a 4-foot level, determine if the cabinets are at level. If not, place a shim beneath the cabinet at a lower level, and screw the two cabinets together at the stile using deck screws.
When measuring the countertop area's dimensions, consider the overhang. Use a diamond-bladed circular saw to cut the countertop to this measurement. Additionally, measure and mark the sink's position and dimensions on the countertop with masking tape.
Now, make the cutout for the sink on the countertop using these measurements.To do this, first drill holes at the four sink corners marked on the countertop. Then, clamp the countertop on two pieces of 2-by-4 boards, and use the drilled holes to cut the sink's sides with a metal-bladed jigsaw. Cut the shorter sides first, and then the longer sides. If the sink's fixtures are to be installed in the countertop, make cutouts for them using an electric screwdriver.
Next, sand and smooth the countertop's edges with 100-grit and 220-grit sandpapers, respectively. Position the countertop over the cabinets and against the wall. Use a silicone sealant to seal the gap between the cabinet and the countertop. Position the sink within its cutout. Apply silicone beneath the flange, and push and secure the sink into place.