Choosing the right valley system is crucial for the performance and longevity of your shingle roofing. In regions like Vancouver, where heavy rainfall is common, it’s essential to understand the differences between closed and open valley systems to make an informed decision.

A roof valley is the area where two sloping roof surfaces intersect, channeling water into the drainage system. Given that valleys handle significant water flow, selecting the appropriate system is vital. According to the Canadian Roofing Contractors Association, there are three primary methods of valley construction for asphalt shingle roofs: open valley, closed-cut valley, and woven valley. 

In an open valley system, a metal flashing—typically made of steel or aluminum—is installed along the valley, with shingles trimmed back to expose the metal. This design allows for efficient water runoff, which is particularly beneficial in wet climates like Vancouver’s. The exposed metal can also add a distinctive aesthetic to your roof.

Conversely, a closed valley system involves extending shingles across the valley so that they overlap, concealing the underlying flashing. While this approach offers a seamless appearance, it may be more susceptible to water buildup if not installed correctly, leading to potential leaks.

In this blog, we will explore the key differences between closed and open valley systems, helping you decide which is best for your asphalt shingle roof in Vancouver’s unique climate.

What Is a Valley System in Shingle Roofing?

A valley system is an essential part of shingle roofing, especially for homes with sloped roofing. Simply put, it’s the area where two roof slopes meet, creating a channel for water to flow off the roof and into the drainage system. Without a properly designed and installed valley system, water can pool or seep into your roof, leading to leaks and long-term damage.

In asphalt shingle roofs, valley systems act as the first line of defense against heavy rain and melting snow. They guide water away from vulnerable areas of the roof, reducing the chances of water damage. Homeowners in regions like Vancouver, known for its frequent rain, understand the importance of a well-functioning valley system to protect their homes.

Valley systems are just one of the many important components of asphalt shingle roofing. For a deeper dive into these components and how they contribute to the durability of sloped roofing, check out 7 Important Components for Asphalt Shingle Roofing on Sloped Roofs.

There are two main types of valley systems used in shingle roofing: the open valley system and the closed valley system. Each type has its unique features, pros, and cons, which we’ll explore in the following sections. Choosing the right system not only affects the durability of your roof but also its appearance and maintenance needs.

Understanding the Closed Valley System

A closed valley system is a popular choice in shingle roofing because of its sleek and seamless look. In this system, shingles from both roof slopes extend into the valley, overlapping to completely cover the underlying flashing. This design conceals the valley, creating a uniform appearance that many homeowners prefer for their asphalt shingle roofs.

One major advantage of the closed valley system is its cost-effectiveness. Since it uses the same shingles as the rest of the roof, there’s no need for additional materials like metal flashing, making it an affordable option. It also blends well with the overall roof design, giving your home a clean and cohesive look.

However, this system isn’t without its downsides. Because the shingles overlap, there’s a higher chance of water buildup if the valley isn’t installed correctly or if debris accumulates. Over time, this could lead to leaks or damage. For homeowners in rainy regions like Vancouver, regular maintenance is crucial to ensure the closed valley system performs effectively.

If you’re considering a closed valley system, consulting an experienced shingle roofer in Whistler can help you determine if it’s the right choice for your home’s sloped roofing. Proper installation is key to making this system work efficiently and last for years to come.

Understanding the Open Valley System

An open valley system is another common option for shingle roofing, known for its practical design and efficient water drainage. In this system, a strip of metal flashing—usually made of aluminum, steel, or copper—is installed along the valley. The shingles on both roof slopes are trimmed back to expose the metal, allowing water to flow freely off the roof.

One of the biggest advantages of the open valley system is its excellent water management. By exposing the metal, water and debris can move easily down the valley without getting trapped. This makes it particularly suitable for sloped roofing in rainy regions like Vancouver, where proper water drainage is essential.

The exposed metal also adds a unique aesthetic to your roof. Some homeowners appreciate the sleek, modern look it gives, while others might prefer a more uniform appearance. However, keep in mind that the visible metal may wear over time, especially in areas with harsh weather conditions.

While the open valley system can be slightly more expensive due to the cost of metal flashing, its durability and performance often make it a worthwhile investment. For homeowners searching for ‘shingle roofers near me’, consulting a professional ensures the system is installed correctly and lasts for years to come.

If you’re unsure whether the open valley system is right for your asphalt shingle roof, a trusted shingle roofer in Whistler can provide expert guidance tailored to your home’s needs. Proper installation and maintenance are key to maximizing its benefits.

Key Factors to Consider When Choosing Between Closed and Open Valley Systems

Selecting the right valley system for your shingle roofing involves evaluating several key factors. Both closed and open valley systems have their strengths, and the best choice depends on your specific needs and circumstances. Here are some points to consider:

1. Climate and Weather Conditions

If you live in a rainy area like Vancouver, water drainage is critical. An open valley system is often a better choice for asphalt shingle roofs in such climates because it efficiently directs water and debris off the roof. A closed valley system, while more visually seamless, may require extra maintenance to prevent water buildup.

2. Aesthetics

The appearance of your roof can significantly impact your home’s curb appeal. A closed valley system offers a smooth and uniform look that blends seamlessly with the rest of your roof. On the other hand, an open valley system exposes metal flashing, which some homeowners find stylish, while others may prefer it hidden.

3. Budget and Cost

Your budget is another important factor. A closed valley system is often more affordable because it uses the same shingles as the rest of the roof. In contrast, an open valley system requires metal flashing, which adds to the cost but can provide better long-term durability.

4. Maintenance and Longevity

Consider the maintenance requirements for each system. Open valleys are easier to clean and inspect since the flashing is exposed. Closed valleys may require more frequent checks to ensure shingles are intact and no debris is trapped. For homes with sloped roofing, professional advice from a shingle roofer in Whistler can help you make an informed decision.

5. Professional Installation

The quality of installation can make or break either system. Improper installation can lead to leaks or water damage, regardless of your choice.Homeowners choosing the best option from their ‘shingle roofers near me’ list should prioritize experienced professionals who can ensure the system is installed correctly.

By weighing these factors, you can decide which valley system suits your shingle roofing needs. Consulting a roofing expert will help ensure your choice balances cost, durability, and aesthetics while meeting the demands of Vancouver’s climate.

Which System Works Best for Asphalt Shingle Roofs?

Deciding between a closed valley system and an open valley system for your asphalt shingle roof depends on your home’s unique needs and preferences. Each system has strengths that make it a better fit in specific situations.

For homeowners in areas like Vancouver, where heavy rain is frequent, the open valley system often stands out. Its exposed metal flashing ensures efficient water drainage, reducing the chances of water pooling and leaks. This design is especially helpful for sloped roofing, where water needs to move quickly and effectively off the roof.

On the other hand, the closed valley system might be a better option if aesthetics and cost are your top priorities. The overlapping shingles create a seamless look that blends with the rest of your roof, making it ideal for those who want a clean, uniform appearance. Additionally, since it doesn’t require extra materials like metal flashing, it can be a more budget-friendly choice for asphalt shingle roofs.

Ultimately, the best system for your roof depends on your priorities—whether that’s water management, appearance, or cost. To make the right choice, consulting a professional shingle roofer in Whistler or searching for ‘shingle roofers near me’ in Google can provide the expertise you need. They can assess your roof’s specific requirements and recommend the system that offers the best balance of durability, style, and performance.

shingle roofing

CONCLUSION

Choosing between a closed valley system and an open valley system for your shingle roofing can feel overwhelming, but understanding the differences makes the decision much easier. Both options have their advantages. A closed valley system offers a clean, uniform look and affordability, while an open valley system provides excellent water drainage and durability, especially for asphalt shingle roofs in rainy climates like Vancouver.

The right choice depends on your home’s unique needs, including weather conditions, budget, and personal preferences. If you’re still unsure, consulting a professional shingle roofer in Whistler or searching for ‘shingle roofers near me’ can help. Experts can assess your roof and guide you toward the best solution.

No matter which system you choose, proper installation and maintenance are key to ensuring your roof remains durable and effective for years to come. Investing in the right valley system is an investment in the long-term protection of your home.