How to Install Crown Moulding

Just last year we finished installing crown molding in the first floor bathroom, hallway, and guest room! It is so nice to look up and see it. The rooms look so finished ya know?

The top floor remains crown molding-less. We will get there. For now, I will bask in the crown molding glory that is my first floor.

If you are new here, we live in a 1929 Tudor Revival that was in fixer upper condition. Since purchasing the home, we’ve been non-stop with the renovation projects. We do a lot of DIY! One such DIY project is the crown molding.

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Gather materials.

Crown molding Make sure to let wood boards acclimate in your home for at least three days!

Crown molding cutting jig

Flexible caulk– good for temperature fluctuation

Plastic wood wood filler -time dry indicator; goes on pink and dries neutral

Miter saw

10 inch blade 80 tooth (more teeth = finer cut)

18 gauge Nail gun

Air compressor

Sanding block

Spring clamps

Construction adhesive

Set up crown molding cutting jig.

At this point you have measured your walls at least twice and got the most accurate measurements. Next up is prepping to cut.

Oh were you wondering “what is a crown molding cutting jog?” It is the black plastic apparatus shown above. A crown molding cutting jig will help to cut the inside and outside corners correctly.

Cutting crown molding.

With the jig in place, you can cut the molding that will run to your corners.

Remember that the more detailed side is hung at the bottom.

If you have scarf joints to cut, you will remove the jig. And don’t forget to change the angle of the saw. We used a thirty degree angle.

What is a scarf joint? This is the seam where two pieces of crown molding meet along a wall.

Add supports to ease affixing to the ceiling and wall.

Use 1×4 poplar wood.

Measure the spring angle of the crown molding. Using this angle create a triangular template.

Cut a few triangles at once. An eight foot board would need three triangles.

The purpose of these triangles is to ensure the boards sit correctly against the ceiling and the wall.

Optional- instead of attaching the triangles to the crown molding directly, some people choose to attach to walls.

Nail boards in place.

We used 18 gauge nails to secure the moulding to the walls and ceilings.

Apply spring clamps if needed.

This step applies if you have a corner like the closet corner shown above.

The spring clamps prevent the boards from sliding out of place while the glue cures..

Cover the nail holes.

We like to use plastic wood with the color change property. You can see it goes on pink, then turns light brown when it is dry. It’s a handy way to let you know it is time to sand.

Sand the wood filler.

Excuse the blurriness- hubby was on a mission to finish!

That tube in the photo is a vacuum to catch as much dust as possible.

Caulk scarf joints.

Here is an up-close shot of a scarf joint with dried wood filler and the caulk being applied to the seam.

Depending on preference, wood filler can be used in the scarf joints.

Prime and paint.

If you need help with cutting your crown molding and getting the angles correct, take a look at this super helpful post from Sawdust Girl- How to Cut Crown Molding Using Easy Templates.

Thanks so much for reading!

Make sure to check out these other DIY posts:

Easy DIY Wood Fireplace Mantle

Installing Hex Tile

Our breakfast nook bench top tutorial

Replacing a kitchen faucet