Where should head wall and sidewall flashing be placed?

The placement of head wall and sidewall flashing is critical in ensuring effective water management and preventing leaks at the roof's intersection points, such as those involving chimneys, dormers, or walls. By positioning the flashing in these areas, it serves as a barrier that directs water away from the building's structure, thus minimizing the chance of water penetration into the walls or the interior spaces.

Flashing installed at roof intersections is designed to channel water runoff properly and intercept any moisture that may seep from the roof's surface. This helps to protect vulnerable areas where the roof connects with vertical elements, which are often the most susceptible to water intrusion. Properly installed flashing at these points is essential for the longevity and integrity of the roofing system and the overall building.

In contrast, placing flashing at the base of all walls does not address the specific areas where water is most likely to collect and pose a risk. Similarly, placing flashing only at the top of the roof would overlook critical intersections, and installing it at outdoor furniture is irrelevant to roofing applications. Thus, the best practice is to ensure flashing is located at these vital intersections to effectively prevent water damage.