Can you describe the difference between continuous and step flashing?

When it comes to waterproofing various structures, understanding the difference between continuous and step flashing is crucial. Both techniques are effective in diverting water away from vulnerable areas, preventing moisture infiltration, and ultimately protecting the integrity of a building. In this article, we will delve into the characteristics and applications of continuous and step flashing, highlighting their differences and explaining when to use each method.

1. Continuous Flashing:
2. 1 Definition and Purpose:

Continuous flashing, also known as continuous membrane flashing, is a technique that involves the use of a continuous waterproof barrier to divert water away from critical joints and intersections in a building structure. It is typically made from a flexible material, such as metal or rubber, that is resistant to water and weather elements.

1.2 Characteristics:

• Continuous flashing is a single-piece barrier, often custom-fabricated to fit specific areas of a building.
• It creates a seamless layer of protection, preventing any gaps or openings that could allow water seepage.
• Common materials used for continuous flashing include aluminum, stainless steel, copper, lead, and rubberized asphalt.
• The flashing is typically installed beneath the building siding or roofing material, covering joints or areas where water penetration is most likely to occur.

1.3 Applications:

• Continuous flashing is commonly used around doors, windows, chimneys, skylights, and any other protrusions on a building’s exterior.
• It is particularly suitable for complex or irregularly shaped structures, as it can be custom-fabricated to fit unique requirements.
• Continuous flashing provides a durable and long-lasting solution, especially when paired with resilient materials like copper or stainless steel.

1. Step Flashing:
2. 1 Definition and Purpose:

Step flashing is a technique that involves the use of individual metal flashing pieces arranged in a stepped pattern. These individual flashing units are interwoven with the roofing or siding material to create a watertight barrier that diverts water away from critical joints and intersections.

2.2 Characteristics:

• Step flashing consists of L-shaped metal pieces, traditionally made from copper or galvanized steel.
• Each piece of step flashing overlaps the adjacent piece, creating an interconnected barrier that effectively channels water down and away from sensitive areas.
• The stepped pattern ensures that no water can pool or seep into the structure, providing excellent protection against moisture infiltration.

2.3 Applications:

• Step flashing is commonly used where a vertical wall intersects with a sloping roof.
• It is particularly reliable in scenarios involving shingle roofs, as the individual flashing units are installed between shingles.
• Step flashing is also suitable for areas such as decks, balconies, and flat roofs that require waterproofing.

3. Choosing Between Continuous and Step Flashing:

While both continuous and step flashing are effective waterproofing techniques, the choice between them depends on several factors, including:

• The specific area or joint requiring flashing.
• The design and complexity of the structure.
• The type of roofing or siding material being used.
• Personal preference or the recommendations of an architect or contractor.

Continuous and step flashing are vital components in protecting buildings from water damage. By understanding the differences between the two techniques, it becomes easier to determine which method is best suited for specific areas and requirements. Whether opting for the seamless and customizable nature of continuous flashing, or the stepped pattern effectiveness of step flashing, both techniques offer reliable solutions to keep structures dry and secure.