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How to Install Undermount Sinks Under Tile Countertops

Cameron Easey

Countertops can have tow different types of sinks installed depending on the preference of the home owner. A sink can be installed through the top of a tile counter or to the underside of a tile counter. Both installation options will require first cutting a hole for the sink in the counter. The first step in installing a sink to the underside of a tile counter is mounting the sink to the counter before cutting and laying the tile.

Installaing the Sink

  1. Measure the length and width of the counter to find the center.

  2. Set the counter top upside down over on the base cabinets or on a set of saw horses.

  3. Place the sink upside down on the counter top and trace around it using a pencil. This will give you the outside edge of the sink.

  4. Draw a second outline line ½ an inch on the inside of the first line. The second line is going to be used as the cut line.

  5. Drill a hole into the counter for the saber saw with a power drill. Place the power drill on the inside of the second line and drill a hole along the pencil line.

  6. Insert the saber saw into the hole and begin cutting along the outline.

  7. Place the sink upside down over the opening of the countertop.

  8. Mark the location of the screw hole in the sink on the countertop with a pencil.

  9. Remove the sink and then drill holes into the underside of the sink for the screws using a power drill. Make sure the holes are not deeper than ½ inch.

  10. Run a bead of caulk along the underside of the sink along the edge.

  11. Place the sink back on the countertop and insert the screws into the holes.

  12. Tighten the screws with a screwdriver.

  13. Turn the countertop over and secure it into place before laying the tile.

Cutting and Laying the Tile

  1. Make a pattern of the sink out of paper or cardboard.

  2. Dry fit the tile over the sink and then place your pattern over the top of the sink.

  3. Trace around the pattern using felt tip marker to indicate where you will need to cut the tile.

  4. Cut the tile using a tile saw. Cut straight lines into the tiles for corners and then break off the pieces. Once that is done sand the edges of the tile with a sandpaper to smooth the edges.

  5. Install the tile around the sink to complete the project.