Roof flashing is an essential component of any roofing system. It is designed to protect vulnerable areas of a roof from water penetration. By directing water away from critical areas, flashing helps maintain the integrity of the roof and prevents water damage.
There are several types of roof flashing available, each serving a specific purpose and requiring different materials.
- Continuous Flashing
- Step Flashing
- Valley Flashing
- Drip Edge Flashing
Continuous Flashing
Purpose
The purpose of continuous flashing is to create a continuous barrier along the joints and seams of a roof. Continuous flashing is commonly used in areas where different roof planes intersect, such as at the ridge, valleys, and dormers. It provides a watertight seal to prevent water from infiltrating through these vulnerable areas.
Materials Used
Continuous flashing can be made from various materials, including galvanized steel, copper, aluminum, or even PVC. The choice of material depends on factors such as the climate, the type of roof, and the desired aesthetics.
Pros and Cons
The main advantage of continuous flashing is its effectiveness in preventing water penetration. It creates a seamless barrier that minimizes the risk of leaks and water damage. However, continuous flashing can be more challenging to install, especially in complex roof designs, and may require professional assistance.
Step Flashing
Purpose
Step flashing is used to protect the areas where a sloped roof intersects with a vertical wall, such as around chimneys and skylights. It is called “step” flashing because each piece overlaps the previous one, forming a stepped pattern.
Materials Used
Step flashing is typically made of metal, such as galvanized steel or aluminum. These materials are durable and resistant to corrosion, ensuring long-lasting protection for the roof.
Pros and Cons
Step flashing offers excellent protection against water infiltration at intersecting points between roofs and walls. Its stepped design allows for easier installation and ensures a secure fit.
However, step flashing may require regular inspections and maintenance to address potential issues, such as corrosion or damage caused by extreme weather conditions.
Valley Flashing
Purpose
Valley flashing is utilized in the valleys of a roof where two roof planes come together. The purpose of valley flashing is to guide water off the roof and prevent it from pooling in the vulnerable valley area. By diverting water away, valley flashing helps prevent leaks and structural damage.
Materials Used
Valley flashing is commonly made of metal, such as galvanized steel or copper. These metals can withstand harsh weather conditions and provide long-lasting protection for the roof.
Pros and Cons
Valley flashing effectively channels water away from the valley area, reducing the risk of water infiltration and potential damage. It is durable and can withstand severe weather conditions.
However, regular maintenance and inspections are necessary to ensure that the valley flashing remains in good condition and free from debris.
Drip Edge Flashing
Purpose
Drip edge flashing is installed along the edges of the roof, particularly along the eaves and rakes. Its purpose is to direct water away from the roof and into the gutters, preventing water from seeping into the underlying structure and causing damage.
Materials Used
Drip edge flashing is typically made of metal, such as galvanized steel or aluminum. These materials are resistant to corrosion and provide effective protection against water intrusion.
Pros and Cons
Drip edge flashing is relatively easy to install and provides excellent water redirection at the edges of the roof. It helps extend the life of the roof by preventing water damage.
However, proper installation and regular maintenance are essential to ensure that the drip edge flashing remains securely in place and free from debris.
