How to Repair Gaps in Molding

Molding is made of wood or PVC material and is installed at the top and bottom of walls to improve their appearance.

Repair Gaps in Molding
Molding is also installed around the perimeter of windows and doors for the same reason. Sometimes after installation, molding develops cracks where the sections join and gaps appear along the edges. This is due to the natural expansion and contraction of the wood and can be remedied by applying caulk. .

Examine the tip of a tube of siliconized latex caulk. Locate the raised ridge and cut across it at a 45-degree angle with a pair of sharp scissors.

Insert the caulk tube into a caulk gun and turn the back screw on the gun until it is tight against the back end of the tube. Press the trigger two or three times until caulk appears at the tip.

Place the tip of the caulk tube against the molding at a 30-degree angle and squeeze the trigger to apply a 1/8-inch wide bead of caulk along the entire edge.

Put on disposable rubber gloves and dip your finger into a cup of water.

Run your wet finger along the entire length of the caulk bead to smooth it. Wipe your finger on a paper towel as needed to remove excess caulk.

Things You Will Need

  • Siliconized latex caulk
  • Scissors
  • Caulk gun
  • Cup
  • Disposable rubber gloves
  • Paper towel
  • Foam caulking cord


  • If the gap is larger than 1/8 inch, purchase foam caulking cord and cut strips to fit into the gaps before applying the caulk.

About the Author

Kimberly Johnson is a freelance writer whose articles have appeared in various online publications including eHow, Suite101 and Examiner. She has a degree in journalism from the University of Georgia and began writing professionally in 2001.