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The overall width of metal should equal the sum of 1 ½ inches (the dimension of the wall leg), plus the distance from the face of the backing wall to the face of the masonry veneer (the dimension of the L leg), plus ¼ inch for the hem.

  • Cut lengths so they will cover the shape of the arch from the bottom of a flashing tray to the bottom of the other tray. Allow 1 inch for overlaps.
  • Bend a ¼-inch hem along the outer edge of each piece and onto the upward side of the L.
  • Bend each piece 90 degrees, upward from the outer edge along a line that is equal to the distance from the face of the backing wall to the face of the masonry veneer. Done correctly, the dimension of the remaining leg should be 1 1/2 inches.
  • Slit the wall leg so that the piece can be shaped to the curve of the arch.
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