How to cut an inside 135 degree crown molding corner

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here we have an inside 135 degree angle

if you can't see the corner that's

because it has a smooth radius you'll

also see 135 degree corners where the

two walls come together with a sharp

edge either way our corners are cut in

the same manner while we call it 135

degree angle the molding is actually

only turning 45 degrees each molding

piece that comes together to create the

corner contributes equally to that turn

so each only has to be cut at a twenty

two and a half degree angle okay let's

go make our cuts all of the corner cuts

we make will be put into the saw in the

same way the only thing we need to

change is the miter angle of the cut the

bevel angle if you have a compound miter

will always be set to zero now just to

illustrate how we're going to cut all

our pieces let's take a look at the

profile of this molding we are

installing it with this being the top so

this flat edge will go up against the

ceiling and this flat edge against the

wall we are going to place our molding

in the saw with the lip that touches the

ceiling pressed flat on the saw up

against the fence with the flat part

that touches the wall point it out

towards us for the molding coming in

from the left side of the corner will

make a miter cut on the right side we

position our saw to the right at the 22

and 1/2 degree miter angle position our

molding into place and make our cut with

the molding coming in from the right

side of the corner we'll make a miter

cut on the left side we position our saw

to the left at the 22 and 1/2 degree

miter angle position our molding in

place and we make our cut

if this was a crisp corner we'd be done

and our two pieces would fit together

perfectly but with the radius of our

corner we have to make some

modifications at the bottom of our

pieces using a utility knife we carve

out the bottom in the shape of the curve

on the wall now we can put them together

and we'll be done any crack between the

bottom of the molding and the wall will

be hidden when we caught the finished