Chimney flashing plays a vital role in creating a watertight seal between the chimney and the roof. It consists of a sheet of metal installed around the area where the chimney intersects with the roof. Its primary purpose is to ensure a watertight connection, preventing water from seeping into the roof and causing damage. While the durability of flashing varies, it does have an expiration date influenced by wear and tear.
Types of Flashing:
- Step Flashing: Step flashing is integrated into the shingles, creating a stepped pattern that follows the roofline.
- Counter Flashing: Counter flashing is placed on top of the base flashing to seal off the upper portion and enhance the watertight seal.
- Smaller Crickets: In some cases, smaller crickets may be installed and covered with metal flashing materials to divert water away from the chimney.
- Rubber: Rubber flashing is another option, known for its flexibility and ability to conform to irregular shapes.
Different Parts of Flashing:
Chimney flashing consists of several components. The base flashing is positioned beneath the roof’s shingles and bends upward against the chimney’s exterior. On top of the base flashing is the counter flashing, which seals the upper part of the base flashing for added protection.
Considerations for Chimney Size:
For chimneys wider than 30 inches, its better to use saddle flashing. Saddle flashing creates a peak that allows water and snow to run off and away from the chimney, minimizing damage to both the chimney and the roof.
Materials for Flashing:
Flashing materials should be impermeable to water and resistant to degradation when in contact with incompatible substances. Common materials we use for flashing include metal (such as aluminum), plastic, and rubber. Each material has its advantages and compatibility considerations.
Flashing in Building Construction:
Proper chimney flashing protects your home from moisture and water damage, ensuring the safety of your loved ones. Metal flashings, including aluminum, are durable and relatively cost-effective. However, we take care to avoid prolonged contact with pressure-treated wood, wet mortar, or plaster, as these can cause corrosion.
Roof Flashing on a Porch Roof:
When installing flashing on a porch roof, we position it behind the siding for aesthetic appeal and architectural balance, creating a seamless appearance. Chimney flashing is an essential component in maintaining a watertight connection between the chimney and roof. Contact us and invest in quality services, to protect your home from potential water infiltration and maintain its structural integrity.