Corner molding is a type of decorative wood piece that matches your horizontal molding. You will usually see it on the upper part of the wall in the corners or the room. The horizontal molding, usually at the juncture of the wall and the ceiling dead end into it. The corner molding serves to provide a visual “flow” around the perimeter of the room.

Another type of corner molding runs vertically on a wall corner. Its purpose is to cap the corner. This is particularly useful when the right and left side of the wall have different finishes.

A perfect application is when the wall on one side is painted and the wall on the other side is finished with wallpaper. Not only does the corner molding make the brake look more natural, but it insures that the wallpaper will not begin to peel off. Now that we have identified what it is, let's look at how to install corner molding.

Tools Needed for Corner Molding Installation

Coping saw
Tape measure
Narrow putty knife
Pencil
Ladder

Preparing the Work Area

First, measure the thickness and length of the top of the corner molding (the edge which will be in contact with the ceiling). Transfer these measurements to the ceiling in one of the corners.

Now take the small putty knife and scrape off any texture within the pencil marks. The reason for this step should be obvious; the molding should lie flush with the ceiling to achieve the right appearance. Do this in all corners of the room.

You can use a coping saw to achieve a professional look in any corner where you work is. First, nail on one piece of the corner, and then cut a 45 degree inside miter into the other leg. Now, mark the contour line. With your coping saw, trim the excess off the remainder. Do any additional trim with your eyeball and a steady hand.

Nail Up the Corner Molding

You should have plenty of space to nail. The wall's framing top plate 2' X 4' is running horizontally behind the sheetrock at the ceiling. Also there are vertical studs in the corner. If you are installing the second type of corner molding discussed above, this is where you should nail.

Finishing Up

If you are installing the first type of molding, now is the time to nail up the horizontal pieces. You can butt them into the corner molding but miter any intersections in the field.

See Also: Preparation for Trim Carpentry