What should be included in a flashing system to ensure effective water diversion?

An effective flashing system is critical for ensuring proper water diversion on a roofing structure. A combination of various flashings is essential because different areas of a roof may require different types of flashing to effectively manage and redirect water.

For instance, base flashings are used where roofing meets vertical surfaces, while counter flashings are utilized to protect the joints between the roof and these vertical surfaces. Additionally, step flashings are often necessary at the juncture between the roof and the wall or in valleys where water is more likely to accumulate. By employing a variety of flashing types, the system can address the specific needs of various sections of the roof, thereby enhancing its overall waterproofing effectiveness.

The necessity for this combination arises because relying solely on one type of flashing, such as just base or just counter flashings, does not provide comprehensive protection against water infiltration, which can lead to leaks and water damage. Each type of flashing serves a distinct purpose, ensuring that every potential entry point for water is adequately protected.