How to Install Trim Molding on Curved Corners

You can apply trim molding to virtually any shape with the proper tools and techniques.

Make 90-degree cuts with a miter saw to align trim molding to a curved corner.Make 90-degree cuts with a miter saw to align trim molding to a curved corner.
Curved corners require a different approach as opposed to a flat wall. Kerfing is the most common method for bending molding around curved corners and provides consistent results. Methods such as using bendable molding are common for more complex applications. Wet bending is another method, which requires extreme care to ensure the wood does not become damaged and discolored.

Measure the approximate length of the curved wall by laying the tape measure on the floor and allowing it to conform to the curve.

Mark a 12-foot long piece of trim in the approximate center and mark the dimension of the curve on the trim piece, centering the measurement on the approximate center mark.

Place marks every 2 inches along the area which was marked out for the curve.

Set the miter saw to 90 degrees.

Place the trim face-down and tight against the fence while keeping the piece flat on the saw table.

Align the saw blade with the mark farthest to the right end of the trim and cut a 1/4-inch deep slot. Do not allow the blade to cut through the face of the trim.

Continue to cut at every 2-inch mark in the same manner as the first.

Miter the ends of the piece at 45 degrees on each end.

Apply a thin bead of construction adhesive to the back of the trim along its entire length.

Place the trim along the curved area of the wall and slowly push the trim into the curve.

Fasten the trim by installing 8-penny nails at the apex of the curve.

Install the nails as necessary to cause the trim to conform to the wall.

Set the nails with the nailset and putty the holes.

Things You Will Need

  • Tape measure
  • Miter saw
  • Construction adhesive
  • Caulking gun
  • Hammer
  • 8-penny finish nails
  • Nailset
  • Wood putty

Tip

  • Take care when handling the kerfed piece to prevent it from breaking.

Warning

  • Wear safety glasses when using hand and power tools. Always read the instruction manual before operating any machinery.

About the Author

Brian Scudder began writing in 1985. His articles appear on various websites. In 2005 he was elected to the United Brotherhood of Carpenters and Joiners of America as an instructor. Scudder studied creative writing at the University of Cincinnati.