What is the purpose of flashing on a roof?

The purpose of flashing on a roof is to cover and protect the exposed edges of roofing materials. This is essential in preventing water from seeping into the roof structure at joints and intersections, such as where different roofing materials meet, around vents, chimneys, and in valleys where water runoff can be concentrated. Flashing acts as a barrier against moisture intrusion, thereby promoting the longevity and integrity of the roofing system.

Flashing is typically made from materials like metal, rubber, or plastic, and its installation is a critical aspect of roofing to ensure that areas prone to leaks are adequately protected. This helps maintain the structural elements of a building and can prevent costly repairs associated with water damage.

The other options do not relate to roofing or flashing. The mention of flames from burners pertains to safety considerations in gas appliances, the material holding bricks together relates to masonry, and wiring subjected to excessive heat concerns electrical safety. Each of these topics is distinct and unrelated to the function and purpose of flashing in roofing applications.