Aluminum Flashing

Definition

Aluminum Flashing: Material in sheets constructed of aluminum, used to cover open roof joints in exterior construction to make them waterproof.

Purpose

The primary purpose of aluminum flashing is to prevent water penetration and leakage in buildings by covering joints, seams, and gaps in the roof and other exterior parts of the structure. This helps to protect the building's interior from water damage, mold growth, and structural deterioration. Aluminum flashing is valued for its durability, resistance to corrosion, and ease of installation, making it an essential component in ensuring the longevity and integrity of buildings.

Examples of Use

1. Roof Valleys: Aluminum flashing is used in the valleys where two roof slopes meet, directing water away from the joint and preventing leaks.
2. Chimneys: Flashing is installed around the base of chimneys to seal the gap between the chimney and the roof, preventing water ingress.
3. Skylights: Aluminum flashing is used around skylights to seal the edges and prevent water from seeping into the roof structure.
4. Dormer Windows: Flashing is applied around dormer windows to waterproof the joints where the dormer meets the roof.
5. Roof Edges: Flashing is used along the edges of roofs to protect against wind-driven rain and to ensure that water flows into the gutters properly.

Related Terms

• Flashing: General term for thin material used to prevent water penetration at joints and seams in building construction.
• Roofing Felt: A protective layer installed under shingles and flashing to provide additional waterproofing.
• Sealant: A substance used to fill gaps and seal joints, often used in conjunction with flashing to ensure waterproofing.
• Gutter: A channel at the edge of a roof for carrying off rainwater, which works together with flashing to manage water flow.
• Underlayment: A layer of material between the roof deck and the roofing materials, providing additional protection against water penetration.

Notes

• Proper installation of aluminum flashing is crucial to its effectiveness; improper installation can lead to leaks and water damage.
• Aluminum is chosen for flashing due to its lightweight nature, resistance to rust and corrosion, and ease of cutting and shaping.
• Regular inspection and maintenance of flashing are important to ensure it remains intact and effective over time, especially after severe weather events.