First take your utility knife around the outside edge where the old caulking is.
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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.
I used the knife and then had to use a flat screwdriver to removed the old caulking.
Nail using 10d nails every 8 to 10 inches along the molding and into the header immediately above the garage door.
Clean the area where the old caulking was too where it was against the bricks.
Hammer and pry the old brick mold off.
Determine the lineal footage of brick molding needed for both sides and across the top of the garage door opening.
You need to know exactly how much brick mold you need to cover the area.
You will need to make miter cuts on the molding which involves a 45 degree angle so that you can slot the pieces together.