Flashing refers to thin sheets of material, typically metal, used to prevent water from entering a building at joints or intersections in the roof, walls, or other areas where different building materials meet. It is a crucial component in construction that helps maintain the integrity and weatherproofing of a structure.
The most common types of flashing used in construction include:
1. Step Flashing: Used along the sides of walls and chimneys, step flashing is installed by placing a piece of metal under each shingle and up against the wall to block water from running down into it.
2. Counter Flashing: Similar to step flashing, counter flashing is used on walls and chimneys but is sawed into an existing mortar joint, with the metal coming over the top of the brick.
3. Apron Flashing: Used at the base of walls or penetrations, apron flashing is L-shaped and can be up to 14 feet long to fit the base of the penetration. It is also used around dormers to prevent water from entering windows.
Proper installation of flashing is crucial to prevent water damage and ensure the longevity of a building. Flashing is used at various locations, such as:
Where a chimney meets the roof
Where roofing meets a wall
Where siding meets a window
At the exposed perimeter of surfaces like roofs and walls
Neglecting flashing details can lead to significant water damage and costly repairs.
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Flashing can be made from various metals, including:
Aluminum
Steel
Copper
The choice of material depends on factors such as aesthetics, budget, and durability. Steel is the most common and cost-effective option, while copper offers a more premium look and longer lifespan.
Conclusion
Flashing is an essential component in construction that helps prevent water intrusion and maintain the structural integrity of a building. Understanding the different types of flashing and their proper installation techniques is crucial for ensuring a building's long-term performance and protecting against water damage.