You will need to make miter cuts on the molding which involves a 45 degree angle so that you can slot the pieces together.
How to install brick molding around a garage door.
Center your brick molding on the jamb with a 1 2 inch reveal.
First take your utility knife around the outside edge where the old caulking is.
Measure several times to ensure that you get it right and then travel to your local hardware store and pick up a suitable amount.
Nail using 10d nails every 8 to 10 inches along the molding and into the header immediately above the garage door.
I used the knife and then had to use a flat screwdriver to removed the old caulking.
The inside miter cuts will each start at the side reveal marks.
This video will show how to replace brick molding on the sides of your garage doors and can be used with the same installation procedure on other exterior do.
You need to know exactly how much brick mold you need to cover the area.
Then place the pry bar between the door jam and brick mold.
Determine the lineal footage of brick molding needed for both sides and across the top of the garage door opening.
Hammer and pry the old brick mold off.