How to Cut 90 Degree Corners on Vinyl Baseboard


Baseboard adds style to a room and also helps protect the bottom of the walls from being dinged by shoes. There are many different types of baseboard, including wood and vinyl. Vinyl baseboard is popular in kitchens and bathrooms. It will not rot when it gets wet and is flexible to install around corners. Often, vinyl baseboard will need to be cut at a 90 degree angle when it is installed. This is achieved by cutting two pieces at 45 degrees angles and butting them together to make 90 degrees.

Things You'll Need

  • Tape measure
  • Pencil
  • Combination square
  • Miter saw
  • Safety goggles
  • Run a tape measure along the wall to your left and measure how long the baseboard will need to be. Measure that distance on the piece of vinyl baseboard and mark it with a pencil. Measure the wall to your right and mark the distance on another piece of baseboard.

  • Line up a combination square along the pencil mark and draw a line across the first piece at the 45 degree angle mark. Turn the combination square the opposite direction and repeat the process for the second piece.

  • Turn the blade of the miter saw to 45 degrees to the right. Adjust the knob and the blade and lock it into place at the 45 degree mark. Slide the vinyl baseboard into the miter saw with the pencil mark facing up. Butt the baseboard up against the saw fence and line up the blade with the pencil mark on the baseboard.

  • Holding the baseboard firmly in place, make your cut. Slide the second piece in and turn the blade of the saw to the 45 degree measurement to the left. Cut the second piece just like the first was cut.

  • Measure both pieces of baseboard and verify the proper cuts were made. Butt the two pieces together on the wall at the 90 degree corners and verify they fit together properly.

Tips & Warnings

  • Vinyl baseboard can also be cut with a utility knife and a straight edge if you do not have a saw. This may take longer, but will do the same job.
  • Always wear safety goggles when working with a miter saw.

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