What is critical for ensuring the function of chimney flashing?

Correct installation is crucial for the function of chimney flashing because it directly impacts how effectively the flashing can prevent water from penetrating the roof and surrounding areas. Flashing is designed to direct water away from the chimney and the roof joints; if it is not installed properly, even high-quality materials can fail.

For example, if the flashing is not integrated correctly with the roofing material or is improperly sealed, gaps may form through which water can enter, leading to leaks and potential structural damage. Furthermore, improper flashing installation can also affect the chimney's overall performance, allowing moisture to accumulate, which could lead to deterioration and mold growth.

While other factors like material selection, routine maintenance, and weather durability are important in the overall lifespan and effectiveness of chimney flashing, none of these aspects can compensate for improper installation. Only with the correct installation can the flashing function as intended, ensuring that it effectively channels water away and protects the integrity of the building.