How to Install Crown Moldings

How to install Crown Moldings

How to Install

Crown Moldings?

Tools & Materials

Note: We recommend having 10-15 percent additional material to cover off-cuts and wastage.


Starting from the inner corner of the room, precisely measure the wall portion.

Making straight cuts

Cutting can be done with either a manual saw with a mitre box or an electric mitre saw equipped with a 12" carbide blade.

  1. Measure and mark the spot where you want to cut the molding with a pencil.
  2. The moldings should be put on the mitre saw or in the mitre box.
  3. Put the moulding in place so that the pencil marking lines up with the saw blade's edge.
  4. Making sure there is no unnecessary movement, firmly press the molding to the bottom and vertical side fence. Then, cut.
  5. To smooth the edges, use a sand block or a piece of sandpaper.


Using the same method, create a 90-degree cornice corner by placing two pieces with 45-degree cuts against the corner wall. You may likely notice a gap between the mitered pieces because most wall corners are not exactly 90 degrees. Fortunately, there is a simple solution: shave the mouldings as necessary to ensure that they securely fit together and make a flawless corner using a sand block or sandpaper.


We advise using either "Alex Flex Moulding and Trim Sealant" or drywall compound for your installation.

Be aware that the ideal technique to level moldings is to position them parallel to the horizontal trim of the door or window because most walls and ceilings need to be plumb and levelled.

Apply drywall compound (Alex Flex caulking with a caulking gun) around the back edges and mitered corner ends of the molding.

Installing a Molding

Place the moldings and press out any extra adhesive. The butt joints on straight pieces, as well as the inner and outside corners, are all the same. Ensure that the profiles precisely align.

Fill In The Holes And Gaps

Using a putty knife, sponge, or even your finger, remove extra material and fill in any gaps. Then, fill in the wall gaps and joints.

Apply support nails as necessary.

After the support nails have dried, correct any flaws and fill nail holes with drywall compound or Alex Flex caulking.


After the support nails have dried, correct any flaws and fill nail holes with drywall compound or Alex Flex caulking.

Sand The Joints Very Lightly

Use sandpaper with 150 grit to sand joints and nail holes lightly.


We recommend using two coats of flat, high-quality paint. There is no need for primer.