How to Cope Bay Window Trim Molding

What You'll Need
Measuring tape
Window trim molding
Coping saw
Miter saw
Work gloves
Protective glasses

Window trim molding, unlike floor or ceiling molding is used to hide the frame of the window. Installing window trim molding on a bay window is a unique process, as you will need to cope the molding to properly fit. Coping window trim molding for a bay window involves using a coping saw. This is a handheld saw which has a very thin blade. Its main purpose is to remove a small amount of wood. The article below will explain how to cope bay window trim molding.

Step 1 – Cut the Angles First

In order to properly cope bay window trim molding, you need to first measure the pieces and cut the initial angles. Set the blade on the miter saw to a 45-degree angle. Measure the bay window where the trim will be placed. Transfer that length to the window trim molding on the back. Place the molding on the miter saw, and line up the line you made with the cut line on the miter saw. Close the fence on the molding to lock it in place. Select inside or outside cut, depending on the position of the trim molding. Put on your gloves and glasses, and then turn on the miter saw. Lower the blade and cut the window trim molding. Repeat with each piece of molding you have for the bay window.

Step 2 – Set Up the Coping Line

Place the first piece of window trim molding on the bay window. Line it up so that the edges meet. Put the next piece of molding in place. If you need to cope the molding, you will notice that the second piece is overlapping with the first piece. Use a pencil to carefully create a line where the two pieces of molding meet. This now becomes your coping line. Repeat with the rest of the pieces until each piece of window trim molding is set with a coping line if needed.

Step 3 – Second Angle Cut

If there is a large difference between the 2 pieces of trim, then it is better if you use the miter saw. Using a coping saw to make major cuts is difficult. If the coping is very minor, you can skip Step 3. If you need to use the miter saw again, replace the window trim molding, and trace the overlap, repeating Step 2.

Step 4 – Cope the Bay Window Trim Molding

The coping saw is a manual tool, so hold it tightly in one hand. Make sure you are wearing heavy work gloves. Slowly ease the blade into the wood in front of the line. Remove a small amount of wood, and then place it on the bay window. Remove more wood until the window trim molding fits. Use only small movements with the coping saw. This is so you do not remove too much wood or splinter it.