What is the best practice regarding the installation of roof flashing?

The best practice regarding the installation of roof flashing involves ensuring proper alignment to direct water effectively. This is critical to the functionality of flashing, as it serves to channel water away from critical areas of the roof, such as seams, joints, and critical transitions. Proper alignment ensures that water does not pool or seep into vulnerable areas where it can lead to leaks and subsequent damage. By directing water away effectively, the lifespan of both the roof and the building structure is significantly increased.

In contrast, installing flashing only on flat roofs would overlook the necessity of flashing on other types of roofs, including sloped roofs, where water runoff and drainage patterns necessitate effective flashing as well. Using the same material as the roofing membrane, while it can be beneficial in certain cases for compatibility, is not as universally applicable as ensuring proper water redirection. Neglecting flashing entirely on low-slope roofs can result in severe water ingress, highlighting the critical need for thoughtful application rather than omission.

By focusing on effective alignment, the roof observer ensures they are adhering to best practices that promote a durable and watertight roofing system.