Installing crown molding starts with planning to ensure it fits your space correctly. Next, measure the room, mark the wall studs, and cut the molding to size. Once prepared, install the molding and finish it off with caulk, paint, or any needed touch-ups.
This article will show you how to install crown molding step by step, from planning and measuring to cutting, installing, and adding the final touches.
| Difficulty Level: Intermediate Duration: 4 – 6 hours Cost: $80 – $300 |
Supplies Needed
Materials:
- Crown molding
- Paintable caulk
- Finishing nails or brads
- Sandpaper or file
- Pencil
Tools:
- Power miter saw
- Coping saw
- Measuring tape
- Stud finder
- Caulking gun
- Nail gun (brad or finish nailer)
- Caulk-smoothing tool
Safety Precautions
- Always use a strong, stable ladder to avoid falls. Do not stand on chairs or anything unsteady.
- Wear safety gear like goggles, a dust mask, and ear protection, especially when cutting or sanding.
- Use power tools carefully by reading the instructions and using them properly. Hold the molding firmly when cutting, and keep your hands away from the blades.
- Keep your work area clean to avoid trips or other accidents.
Step 1: Plan the Layout
Start your crown molding project by planning how the pieces will go around the room. Choose a molding style that matches your room’s look, such as a decorative profile for a bold effect or cove molding for a simple, clean finish.
Begin on the wall opposite the main entrance so the first view of the molding looks smooth and professional. This first piece should have straight cuts on both ends.
As you move around the room, decide how each piece will connect. The next pieces will usually have one end shaped to fit into the previous piece, either by coping or mitering. For outside corners, you may need to angle both ends.
To stay organized, draw a simple sketch of the room and number each wall. Later, you can match your molding pieces to these numbers to make installation easier.
Step 2: Identify Inside and Outside Corners
Using the same sketch of your room, go back and label each wall. Mark the corners and identify whether they are inside or outside corners.
An inside corner is where two walls meet and turn inward, like a typical corner of a room. An outside corner sticks out into the space, and the molding will need to wrap around it. These two types of corners require different angled cuts.
It also helps to mark the left and right sides of each corner. To do this, face the corner and label the wall on your left as the left side, and the wall on your right as the right side.
Step 3: Measure the Wall, Find the Studs
Next, measure each wall from corner to corner and write the numbers on your diagram. Lightly draw a straight line along the wall to mark where the bottom edge of the crown molding will sit.
As you measure, use the total wall length to estimate how much molding you’ll need. Be sure to buy about 25 percent more than your total measurement to allow for mistakes or waste.
It’s also best to use longer pieces whenever possible, since shorter sections can be harder to align cleanly. Most stores carry 8- and 12-foot lengths, while some lumber yards offer 16-foot pieces for fewer seams.
Then, use a stud finder to locate the wall studs and mark them with a pencil near the ceiling. These marks will guide you when it’s time to nail the molding in place.
If you are unsure how to locate the studs, check out our helpful guides on how to find studs in the wall and how to find studs without a stud finder for step-by-step instructions.
| Pro tip: “Using a laser to mark a level line around the room is probably the best way to start.” – Andy Orsini |
Step 4: Cut the Crown Molding
Mark each piece of crown molding with the correct measurement before cutting. Use a power miter saw for this task, as it provides clean, precise cuts that you can easily line up at corners and joints.
Before you begin cutting, make sure you understand the correct orientation of the molding. The top edge is usually simpler and sits against the ceiling, while the more decorative bottom edge faces the room and extends down the wall.
To check the orientation, look at the grooves. Deeper grooves go on the bottom, and shallower grooves go on top. If your molding has a concave and convex side, the concave side should face down.
When cutting crown molding, position the piece upside down on the saw. The part that will sit against the ceiling should lie flat on the base of the saw table. You should also press the part that will rest against the wall firmly against the vertical back fence.
Because this technique takes a bit of practice, try making a few test cuts on scrap pieces before cutting your final molding pieces. This will help you get comfortable with the angle and avoid wasting materials.
Quick Summary: Cutting Crown Molding
| Type of Corner | Left Side | Right Side |
| Inside Corner | Miter right at 45°Save the right end of the cut | Miter left at 45°Save the left end of the cut |
| Outside Corner | Miter left at 45°Save the right end of the cut | Miter right at 45°Save the left end of the cut |
- Cut for Inside Corners – To cut crown molding for an inside corner, start with the left side. Turn your miter saw blade to the right at a 45-degree angle. Cut the piece and keep the right side of the cut. For the right side of the corner, turn the blade to the left at 45 degrees. Cut the piece and keep the left side.
- Cut for Outside Corners – To cut the left side piece, turn the miter saw blade to the right at 45 degrees. Keep the piece on the right side of the cut. For the right side piece, turn the blade to the left at 45 degrees. Keep the piece on the left side. These two cuts should fit together to form a smooth outside corner.
- Join Two Straight Pieces – Sometimes, one piece of crown molding isn’t long enough to reach across a wall. You can join two pieces using a scarf joint. A scarf joint is when you cut the ends at opposite 45-degree angles so they fit together smoothly.
To do this, cut the first piece at a 45-degree angle like for an inside corner. Cut the second piece at the opposite 45-degree angle, like for an outside corner. When you put them together, the angled cuts create a neat, almost invisible joint that looks much better than a simple straight cut.
Coping for Inside Corners
Coping is a cutting method that installers use to make crown molding joints fit tightly on inside corners. It works better than miter cuts in many homes, where walls aren’t perfectly square.
Instead of joining two 45-degree cuts, this method shapes one molding piece to match the profile of the other. This helps create a clean, gap-free joint even when the corner angle is slightly off.
To make a coped joint, first cut one piece of molding straight so it fits flat into the corner. Cut the second piece at a 45-degree angle, then trace its edge with a pencil. Use a coping saw to cut along the line, removing the back side of the molding and leaving just the profile.
Test the fit and adjust with sandpaper or a file until the joint fits snugly. While it takes a bit more effort, coping gives a more professional finish for inside corners.
| Pro tip: “Understanding the process of coping a corner versus cutting a miter is also helpful.” – Andy Orsini |
Step 5: Install the Crown Molding
To install the crown molding, turn it upright and start at the center of the wall. Work your way toward the corners. The molding should sit at a 45-degree angle, fitting evenly against both the wall and ceiling.
Most crown moldings have flat edges that help with proper placement. If the angle is off, you may see gaps, especially in the corners.
You can make the job easier by preassembling crown molding sections before installing them. Using a headless nailer, you can join the pieces together first, which helps keep the corners tight and the lines straight.
Use a power nailer to drive brads or finish nails into the wall studs or top wall plate. Make sure to nail the corners and any scarf joints securely. Try to position scarf joints over studs for better support.
Having someone to help during this step can make a big difference. Holding long pieces of molding in place while aligning and nailing them can be tricky on your own.
Andy Orsini, owner of Santa Cruz-based Andy’s Fine Woodworking, emphasizes this by saying, “Having 2 people is a good start. Another set of helping hands is essential.”
Step 6: Finishing Touches
Most walls and ceilings aren’t perfectly straight, so it’s normal to see small gaps where the molding meets the surface. To fix this, apply a thin line of flexible, paintable caulk along the gaps. This helps create a smooth and clean look.
You should also caulk the corners where two pieces of molding meet, especially at angled joints. After applying the caulk, smooth it with a damp finger or a caulking tool. Let it dry completely, following the instructions on the label.
If you plan to paint the molding, apply a coat of primer first, especially if the molding is bare wood or a material that doesn’t already have a finish. Primer helps the paint stick better and gives a more even color. Once the primer is dry, you can paint the molding in your desired color.
Home Gnome delivers the best home service experience at the click of a button. Book reliable, skilled services in seconds and leave the rest to us.
Main Photo: Worker installs crown molding along the ceiling/ Photo Credit: Ed / Adobe Stock
Related Posts:
