How to Caulk Window Molding


Even the most expertly installed window molding is going to have a visible space between the wood of the molding and the surrounding wall and window casing. Not only is that space unsightly, but it allows air to get in, diminishing heating and cooling efficiency. A neat, clean line of caulk will solve both problems. You can try to match the caulk color to the trim or the wall, but white is usually an acceptable caulking color.

Things You'll Need

  • Caulk tube
  • Caulk gun
  • Utility knife
  • Long nail (longer than the tip of the caulk tube)
  • Cup of water
  • Damp cloth
  • Cut the tip of the caulk tube at a 45-degree angle, making the hole at the end about 1/4 inch wide. Stick a long nail into the hole and break the seal at the base of the tip. Set the tube in the caulk gun.

  • Squeeze the trigger until the caulk rises to the tip and starts coming out. Press the trigger release to stop the flow of the caulk. Wipe the expelled caulk off the end of the tip with your damp cloth.

  • Press the tip of the tube to one inner corner of the window molding, on the seam between the molding and the window's edge. Squeeze the trigger while dragging the gun backward, laying a smooth, thin bead of caulk and covering the seam. Don't stop until you get to the end of the span, then pull the gun away and immediately press the trigger release to stop the flow of caulk.

  • Wet your index finger in a cup of water. Run the tip of your wet finger along the whole caulk line, flattening and smoothing it against the seam. Wipe the excess caulk off your fingertip with the wet cloth.

  • Repeat the process for each side of the molding, including the outer perimeter where it meets the wall.

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