How to: Brick Flashing


Brick is a durable construction material for building exteriors, but it is porous and can allow water to penetrate to the interior of the walls. Water will penetrate bricks, but flashing is one line of defense to ensure that water does not reach the interior of a home or building. Always install flashing material beneath a layer of bricks and pieces of flashing must overlap and be sealed. Some types of flashing for use around windows and doors is self-adhesive. Another very important flashing location is at the base of a wall.

Things You'll Need

  • Flashing membrane
  • Sheet metal drip guard
  • Contractor's tape
  • Flashing seal
  • Utility knife

Flashing at the Wall Base

  • Pick a durable and flexible L-shaped flashing.

  • Clean and prime any brick, concrete or other construction material that will stick to self-adhesive flashing.

  • Install each piece of flashing with the long side of the "L" positioned vertically at the base of the brick, so the first row of bricks sits on top of the flashing. A drip edge, or corrosion resistant strip of sheet metal should be installed under the short side of the "L."

  • Overlap each piece of flashing and seal it with a flash-seal product. Also seal the flashing to the drip edge.

  • Wrap the construction with house wrap or building paper paper. The house wrap must overlap the flashing. Seal the seam between the house wrap and flashing.

Above Wall Openings

  • Cut a flap in the house wrap or building paper.

  • Lift up the flap in the house wrap and install the flashing under the house wrap.

  • Lay the flap of house wrap in its original position and seal the cut edges with contractor's tape.

  • Contour the bottom of the flashing over horizontal surface of the upper frame of the wall opening. A sheet metal drip guard should be placed under the flashing. Seal the flashing to the drip guard.

Under Wall Openings

  • Contour the top of the flashing over horizontal surface of the lower frame of the wall opening.

  • Shape the flashing down the side of the wall opening and then horizontally away from the wall, over the very next row of bricks below the wall opening.

  • Bend the edges of the flashing upward to create an end dam at the sides of the opening. This dam should guide water away from the opening and to the flashing to drain away from the construction.

  • Lay a row of bricks on top of the flashing, leveling with the bottom of the wall opening.

Tips & Warnings

  • When laying brick around a construction, include weep holes to allow any water that has penetrated the masonry to escape. Do this by leaving an unmortared gap between every fourth brick.

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