How to Cut Crown Molding Flat

Do you want to know how to cut crown molding flat? This is a great technique to use when you want to add a decorative touch to your home. Follow these simple steps and you’ll be able to achieve a professional look in no time.

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Molding and trim can add an elegant finishing touch to any room in your house. But if you’ve ever tried to install molding, you know that it can be a challenge to get the pieces to fit together perfectly. Crown molding is especially tricky because it has to be cut at an angle to fit flush against the ceiling.

The good news is that there is a way to cut crown molding flat so that it lays perfectly against the ceiling. With this method, you don’t have to worry about angles or complex math – all you need is a miter saw and a few simple tools. In this article, we’ll show you how to cut crown molding flat so that you can install it like a pro.

Tools You’ll Need

Crown molding is a beautiful way to finish off the tops of cabinets, windows, doorways, and fireplace mantels. But it can be tricky to install, especially if you don’t have the right tools. Here’s what you’ll need to cut crown molding flat:

1. A miter saw: This is the best tool for cutting crown molding at any angle. You can use a hand saw or power miter saw, but a miter saw will give you the most control and the best cuts.

2. A coping saw: This tool is helpful for cutting inside corners where the miter saw can’t reach.

3. A hammer: You’ll need this for tapping the molding into place as you install it.

4. Nails or screws: These will be used to attach the molding to the wall or ceiling. Nails are generally sufficient for attaching molding, but if you’re using a particularly heavy or thick piece of molding, you may want to use screws instead.

5. Caulking: This will be used to fill in any gaps between the molding and the wall or ceiling, creating a seamless look.


Cutting crown molding flat can be a tricky proposition. Many people think that it is simply a matter of cutting the molding at a 45 degree angle, but this is not the case. In fact, if you cut the molding at a 45 degree angle, you will end up with a piece that is too wide at the top and too narrow at the bottom. The key to cutting crown molding flat is to make two cuts – one at a 45 degree angle and one at a 22.5 degree angle.

Here are the steps you need to take in order to cut crown molding flat:

1. Measure the width of the wall where the crown molding will be installed.

2. Cut one piece of crown molding at a 45 degree angle. This piece should be long enough to span the width of the wall plus an additional 3 inches (7.5 cm).

3. Cut a second piece of crown molding at a 22.5 degree angle. This piece should be long enough to span the width of the wall plus an additional 1 inch (2.5 cm).

4. Install the first piece of crown molding by attaching it to the wall with nails or screws.

5. Install the second piece of crown molding on top of the first piece, overlapping it by 2 inches (5 cm). Nail or screw this piece into place as well.

Cutting the Crown Molding

Cutting the Crown Molding
You will need to make a few cuts to the molding before you can install it. The most important cut is the “flat cut.” The flat cut is made on the top of the molding and determines how the molding will lay flat against the wall. To make a flat cut, hold the molding so that the flat side is facing you and the point of the crown is pointing down. Make a mark on the top of the molding at the point where you want to make your cut. Then, holding the molding against a miter box or other straight edge, use a hand saw or power miter saw to make your cut.

Finishing Up

Now that you’ve cut your crown molding, it’s time to finish the job. You’ll need to sand the edges of the molding to smooth them out, then apply a finish of your choice. You can paint or stain the molding to match the trim in your room, or you can leave it natural for a more rustic look.

Once you’ve applied the finish, you’ll need to install the molding. Crown molding is typically installed using nails or screws, but you may need to use adhesive if your molding is particularly thick or heavy. Start at one end of the room and work your way around, nailing or screwing the molding into place. If you’re using adhesive, apply it to the back of the molding and then press it into place.

Once the crown molding is installed, stand back and admire your handiwork!


In conclusion, the best way to cut crown molding flat is by using a jigsaw. It is important to use a sharp blade and to make sure that the blade is perpendicular to the work surface. When cutting, it is also important to keep the work piece level so that the molding will fit flush against the wall when installed.