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.
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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.
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.
You need to know exactly how much brick mold you need to cover the area.
First take your utility knife around the outside edge where the old caulking is.
Then place the pry bar between the door jam and brick mold.
Measure across the opening from side to side at eye level and add 8 inches to.
Center your brick molding on the jamb with a 1 2 inch reveal.
Hammer and pry the old brick mold off.
Measure several times to ensure that you get it right and then travel to your local hardware store and pick up a suitable amount.