Installing a crown molding is a easy and low cost way to make room look more elegant and refined.It make your room feel less boxy and bland , best of all ,it can increase the value of your apartment . If you are ready to transform your home with crown moldings and you are not a professional contractor or woodworker , you may need our tips that how to cut a 90 degree crown molding corner , inside corner and outside corner .

Materials and tools

  • Crown Moldings
  • Miter Saw

Cut an 90 degree inside corner for crown moldings

The most of common inner corner in the room is standard inside 90 degree corner. We have the options that miter the both pieces to create a corner or cope the moldings .We will go over both methods and start with miter technique.All of the corners we made will be put into the saw in same way, the only thing we need to change is the miter angle of the cut blade .If you have a compound miter , set to zero .

The most of common inner corner in the room is standard inside 90 degree corner. We have the options that miter the both pieces to create a corner or cope the moldings .We will go over both methods and start with miter technique.All of the corners we made will be put into the saw in same way, the only thing we need to change is the miter angle of the cut blade .If you have a compound miter , set to zero .

compound saw
set to sero

Now let’s take a look at the profile of this molding we are installing it .Each crown molding profile has two flat edges , Ceiling flat edge which go up against the ceiling and wall flat edge which will go up against the wall .

We are going to place our molding in the saw with the lip that touch the ceiling pressed flat on the saw up against the fence. The flat part that touches the wall point it out towards us. For the molding coming from left side of the corner ,we are going to make a miter cut on the right side. We position our saw to the right at the 45 degree miter angle ,hold molding up into place and we make our cut. With the molding coming in on the right side of the corner will make a miter cut on the left side of our molding . We position our saw to the left at the 45 degree miter angle ,hold our molding up into position and we make our cut.

molding position
left side of corner cut right side
right 45 degree miter angle
left 45 degree miter angle

Corners usually are not very crisp and tend to be slightly rounded where the points of the molding cant go all the way in. To compensate for this ,it is helpful to remove a small amount from the unexposed part at the bottom of the molding using a utility knife .

Here we go corner complete now

cut unexposed
finished inside corner

Now let’s take a look at how we handle the same corner using coping method .On one side of our corner ,we will just have the molding(first piece ) running all the way into the wall . The second piece will then be cut to fit over it .

The piece on the left of the corner (first piece ) comes all the way to the wall ,so we just need to cut the piece that comes from the right. Make this cut exactly like we did for the mitered corner by moving the saw to the left 45 degree miter angle and we make our cut .

Take a handsaw and cut out the unexposed profile of this molding, this yellow part and slide this copped piece over the molding that runs into the wall.

piece runs into the wall
piece to be copped
Copping
slide the copped piece

Cut an 90 degree outside corner for crown moldings

 Molding position placed on the saw is same as cutting inside corner, molding in the saw with the lip that touch the ceiling pressed flat on the saw up against the fence.

For the molding coming from left side of the corner ,we are going to make a miter cut on the right side. We position our saw to the left at the 45 degree miter angle and then make a cut. Please note the top part of the molding should be longer than the bottom

For the molding coming from right side of the corner ,we will make a miter cut on the left side. Position our saw to the right at the 45 degree miter angle and then make a cut. Same again the top part of the molding should be longer than the bottom.

Finally put the two pieces together to reach a outside corner . If there are some gaps ,just use chaulk to fill the joints .