Flashing

Flashing

File:Flashing example.jpg

Example of flashing on a roof

Flashing is a material used in modern construction to prevent the passage of water into a structure from an angle or joint. Flashing is typically installed at intersections and terminations of building components to deflect water away from the seams and joints, thereby preventing leaks and water damage.

Types of Flashing

There are several types of flashing used in construction, each serving a specific purpose:

• Roof Flashing: Installed around roof features such as chimneys, vents, and skylights to prevent water from seeping into the roof structure.
• Wall Flashing: Used at the junctions of walls and roofs, or around windows and doors to prevent water infiltration.
• Sill Flashing: Placed under windows or doors to direct water away from the building.
• Step Flashing: Used where a roof meets a vertical wall, with pieces of flashing overlapping each other to create a step-like pattern.
• Valley Flashing: Installed in the valleys of a roof where two roof planes intersect, directing water down the valley and off the roof.

Materials

Flashing can be made from a variety of materials, each chosen based on the specific requirements of the construction project:

• Aluminum: Lightweight and easy to work with, but can corrode when in contact with certain materials.
• Copper: Durable and long-lasting, often used in high-end construction.
• Lead: Highly malleable and long-lasting, but concerns about toxicity have reduced its use.
• Galvanized Steel: Strong and durable, commonly used in residential construction.
• Rubberized Asphalt: Flexible and self-sealing, often used in conjunction with other materials.

Installation

Proper installation of flashing is crucial to its effectiveness. The process typically involves:

1. Cleaning the surface where the flashing will be applied. 2. Cutting the flashing material to the required size and shape. 3. Securing the flashing in place using nails, screws, or adhesive. 4. Sealing the edges of the flashing with a waterproof sealant to prevent water infiltration.

Maintenance

Regular maintenance of flashing is essential to ensure its longevity and effectiveness. This includes:

• Inspecting flashing for signs of damage or wear.
• Re-sealing any gaps or cracks that may have developed.
• Replacing damaged or corroded flashing as needed.

Related Pages

• Roof
• Chimney
• Ventilation (architecture)
• Waterproofing
• Building envelope

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