How to Replace a Corian Countertop

Cut off the power to any electric outlets surrounding the countertop from the main electrical box for your home. Turn water shut-off valves leading to any sinks in the countertop to the "Off" position as well. Verify that both the electricity and water are off by plugging something in and attempting to operate it, or by running the faucets.

Remove the caulk installed around the edges of any sink placed in the countertop by cutting the caulk into strips with a utility knife, and then using a putty knife to pull it off.

Look under the sink for any securing screws. Use a Phillips-head screwdriver to remove the screws. Use an adjustable wrench to unscrew the pipes that connect the faucet to the water pipes from the house, and the drainage pipe with the drain of the sink. Lift the disconnected sink from the countertop and place it off to the side.

Locate the screws beneath the countertop at the top of the cabinetry that secures the countertop in place. Remove the screws, using the Phillips-head screwdriver. Run a putty knife down and across the rear of the counter where it’s glued to the wall to break the adhesive bond. Pull upward on the countertop to remove it from the cabinets.

Set the replacement Corian countertop on the cabinetry. Use a straightedge to mark a cutting line with a pencil to denote the length of countertop needed.

Set the countertop on a pair of sawhorses with wooden extensions along the tops that you can cut into, with the top of the countertop face down. Put a piece of masking tape down the center of the cutting line for the countertop, and then mark a new cutting line on the tape.

Cut the countertop along the cutting line with a circular saw containing a fine-tooth carbide blade. The tape will help avoid splintering during cutting. Remove the masking tape, and then smooth the cut edge with a belt sander containing 50-grit sandpaper. Wipe off the dust with a damp cloth.

Return the countertop to the cabinets and check for fit. You can make minor adjustments for fit by using the belt sander to remove material from the countertop edges. Brush a layer of contact cement on the rear of the countertop, and then tilt it slightly upward in the front and place beads of silicone caulk on the cabinet tops where the countertop will rest. Push the countertop against the rear wall and lower it to the cabinet base.

Secure the countertop in place by restoring the screws through the top of the cabinet and upward into the Corian. Use an electric screwdriver to drive the screws back in place.

Set the sink in the precut hole in the counter. Seal the edge of the sink where it meets the counter with a bead of caulk running around the entire sink perimeter. Reconnect the water hoses and drainage pipe. Restore the power and electricity to the area.