How to Miter Square Inside Crown Molding Corners How to Miter Square Inside Crown Molding Corners

What You'll Need
Tape measure
Compound miter saw

Cutting 45-degree inside crown molding corners is not as simple as cutting basic trim boards. If you cut crown molding in this fashion, you will end up with large gaps and cracks, making the finished job look messy. The trick to cutting an inside crown molding corners is to make sure that the molding is placed firmly against the fence of the miter saw. It has to be cut in the exact same angle that it will be when it is attached to the wall. Follow the simple steps below to cut a miter square in your crown molding corners.

Step 1: Determine the Exact Length Needed

Use your tape measure to determine the exact distance of the piece of crown molding that you will need. Transfer this measurement to the front or  finished side of the crown molding that you plan to use.

Step 2: Prepare to Cut

Place the marked crown molding onto a solid workbench or table, flat side down. Use a speed square to, draw a line straight across the piece of molding. During this phase, make sure that you hold the square flat against the highest portion of the molding and draw straight along the square. The line may not look straight, but if you did this step correctly, it will be perfect once the crown molding is installed.

Step 3: Cut the Crown Molding

Hold the crown molding finished side up, and rotate it so that the bottom edge—the edge that will be facing the floor—faces up. Press the footing against the rear fence, and then lift up so that the beveled edge is flush against it. While doing this, make sure that the shoulder of the piece of crown molding is flush against the bottom saw table. If this step is done correctly, the molding will now form a triangular gap behind it. Make sure that the compound miter saw is set to cut a 45-degree, and proceed to cut the molding.

When cutting, take your time and be aware of which direction the angle should be cut. When you are cutting an inside corner, the finished side of the molding will show the cut, so be sure that you cut the adjoining angles correctly. Basically, when the molding is going up on the left side of a corner, the blade should cut a left angle, and the vice versa for a right hand corner.

It is usually a good idea to cut a few pieces of scrap molding and place them into the corner to ensure that you have made the angles correctly. This step will ensure that you do not waste an excess amount of the fairly expensive crown molding.

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