Step Flashing

Proper installation of flashing materials at roof penetrations and wall abutments is an important part of a properly functioning roof system. Roof penetrations are mainly where leaks occur. The most common place where flashing is required is at walls, chimneys, and skylights.
“Step” or “Base” Flashing is typically installed in these areas. Step flashing is an L-shaped piece of sheet metal placed along a wall or chimney and then covered with a shingle and then another piece over laps this step just above the exposure of a shingle. This process is repeated and then is either overlapped by siding or counter flashing.
Counter flashing involves cutting a reglet into the mortar or stone of the chimney or wall and inserting the horizontal flange of the counter flashing “Flag” into it. The “Flag” is held in place with a wedge and the reglet is then filled with mortar or a quality flashing caulk.