How to Re-Anchor Flashing to Brick and Mortar

Position a ladder next to the home in an area with level ground. Climb up onto the roof and walk carefully to the location where the flashing lies against the brick and mortar.

Pull the flashing back gently and examine the portion that is loose to see whether old roofing caulk remains on it. If so, scrape off the old caulk using a utility knife to allow the flashing to lie flat against the brick.

Brush the flashing and the area behind it with a stiff-bristled brush to remove all dirt and particles, which may interfere with the flashing adhesion.

Cut the tip off of a tube of roofing cement, also called roofing caulk. Insert it into a caulk gun and apply a bead around the entire back of the flashing that faces the brick and mortar.

Press the flashing against the brick and mortar firmly with your hands and smooth your hands from the center of the flashing out toward the edges.

Insert the tip of a galvanized nail at one of the top corners of the flashing over a mortar joint. Hit the head firmly with a hammer to sink it into the mortar. Insert another nail at the top right corner of the flashing, again aligning it with a mortar joint before hammering it in.

Apply another bead of roofing caulk around the perimeter of the flashing to seal it completely from water penetration.