Flashing Against Existing Panel Siding

Measure over from the other panel to mark the top and bottom of the vertical cut and snap a line between the marks.

Flashing against existing panel siding.

Install the kickout flashing underneath the first shingle photo 1. Using a metal j flashing between these types of transitions provides a barrier between siding and transitions that protects against water intrusion. But the j cap also creates a consistent line. Install the flashing before you finish the top of the brick wall as the flashing must go behind the siding as well as behind and under the top row of bricks that angle outward to cover the top.

Flush the end of the flashing length with the wall corner and secure the flashing to the framing with an 8d nail at each wall stud. A key part of my approach is using a special piece of flashing at this vulnerable intersection called kickout flashing or kickout diverter. Cut 1 4 inch above the flashing or window. Unless you re careful step flashing can allow water from the roof to slip behind the gutter and get behind the siding and even the housewrap.

However in most instances step flashing should be installed behind siding. Hold a panel at the correct height and against a window or other obstruction to mark for the horizontal part s of a cutout. Since newer installation guidelines do not recommend caulking this joint but instead recommend leaving a small gap and flashing behind the ends of the siding i think it is more prudent to add flashings when it is possible to do so. If the shingle already has flashing on it the kickout flashing has to slip beneath it and you ll have to loosen or remove siding to do this.

Flashing is a strip of metal usually aluminum about 8 inches long and bent at 90 degrees with each side at least 5 inches wide. Again allow for a 1 4 inch gap. On a wall to be covered with wood cement board vinyl or metal.