What is the primary function of bent, galvanized metal flashing in roofing?

The primary function of bent, galvanized metal flashing in roofing is to prevent water from getting behind trim or brick. Flashing is used in areas where the roofing meets vertical surfaces or changes in plane, such as around chimneys, vents, and walls. By directing water away from these vulnerable points, it helps to avoid water infiltration, which can lead to leaks, rot, and damage to the underlying structures.

This protective function is crucial for maintaining the integrity of the roofing system and ensuring that it effectively shields the interior of the building from the elements. Galvanized metal is often chosen because it is rust-resistant, making it a durable choice for roofing applications where it will be exposed to moisture.

While insulation between roofing layers, enhancement of aesthetic value, and reinforcement of structural integrity are important aspects in roofing practice, they do not primarily pertain to the purpose of flashing. Flashing is specifically designed for water management, ensuring that roofs remain watertight.