W Valleys vs. Other Valleys: What’s Best for Your Roof?

Print/Save as PDF

When it comes to roofing, valleys are an essential design feature that play a critical role in directing water off your roof. Roof valleys are the areas where two slopes of a roof meet, creating a channel for rainwater, snow, and debris to flow down to your gutters. 

However, not all roof valleys are created equal. There are several different types of roof valleys, each with its own pros and cons, and one of the most popular options is the W valley. But why are W valleys becoming so popular?

Rescue My Roof has been a leader in the roofing industry for over a decade. Our transparency in our education is why homeowners keep coming back to us – and today, we’re using our expertise to help you. 

In this blog, we’ll explore what a W valley is, how it compares to other types of roof valleys, and which option might be best for your home. Ultimately, you’ll know which valley type is best for your roof. 

What Is a W Valley?

A W valley is a specialized type of roof valley that gets its name from its distinctive shape. The metal flashing used to create the valley is bent into a “W” shape, which helps direct water into the center of the valley and away from the roof. This design creates a dual-channel effect that enhances water flow and reduces the chances of water pooling or leaking.

Here are some key features of W valleys:

• Dual Drainage: The W shape helps divide the water flow into two channels, allowing for better water management and reducing the risk of overflow during heavy rains.
• Extra Protection: The raised center of the W valley adds an additional layer of protection against water penetration, helping to keep your roof dry.
• Durability: W valleys are typically made from metal, such as aluminum or galvanized steel, which provides long-lasting durability and resistance to the elements.

3 Other Types of Roof Valleys

In addition to the W valley, there are several other common types of roof valleys, each with its own benefits and drawbacks. Let’s take a closer look at some of the most popular options:

1. Open Roof Valley

An open valley is one of the most traditional types of roof valleys. In this design, a metal flashing is installed in the valley, but unlike the W valley, the flashing is left exposed. Water flows directly on top of the flashing and into the gutters.

Pros:

• Effective Water Flow: Open valleys are very effective at directing water off the roof, especially during heavy rain.
• Cost-Effective: Open valleys are generally more affordable than other types, making them a popular choice for budget-conscious homeowners.

Cons:

• Exposed Metal: The exposed metal can become a point of vulnerability over time, as it’s more susceptible to corrosion, wear, and tear.
• Aesthetic Considerations: Some homeowners prefer not to have the metal flashing visible, as it can detract from the overall appearance of the roof.

2. Closed Roof Valley

A closed valley is a design in which shingles from both sides of the roof are installed over the valley, covering it entirely. The shingles are woven together, forming a continuous surface that directs water down the valley.

Pros:

• Seamless Appearance: Closed valleys provide a more uniform and seamless appearance, as the valley is completely covered by shingles.
• Added Protection: With the valley covered by shingles, there is an added layer of protection against water penetration.

Cons:

• Water Flow Issues: Closed valleys may not drain water as effectively as open valleys, particularly during heavy rainstorms. This can lead to pooling and increased wear on the shingles over time.
• Shingle Wear: The constant flow of water over the shingles in the valley can cause them to wear out faster, leading to potential leaks if not properly maintained.

3. Cut Roof Valley

A cut valley is a variation of the closed valley, but with a key difference: instead of weaving the shingles from both sides, one side of the shingles is cut along the valley, creating a clean, straight line down the center. The cut shingles on one side overlap the shingles from the other side, which are left uncut.

Pros:

• Aesthetic Appeal: Cut valleys offer a cleaner, more refined look compared to woven shingles.
• Improved Water Flow: The design allows water to flow smoothly off the roof, reducing the risk of pooling.

Cons:

• More Labor-Intensive: Installing a cut valley requires more precision and time, which can increase labor costs.
• Potential for Wear: Like closed valleys, the shingles in a cut valley can experience wear over time due to constant water flow.

W Valley vs. Other Roof Valleys: Which Is Best?

Now that we’ve covered the most common types of roof valleys, let’s compare the W valley to other options and see how it stacks up in different areas:

Water Management

• W Valley: The dual-channel design of the W valley excels at managing water flow, particularly in areas that experience heavy rainfall. By creating two separate channels, it reduces the risk of water backing up or overflowing, which can lead to leaks.
• Open Valley: Open valleys also provide excellent water management, but the exposed metal can wear down over time, increasing the likelihood of leaks.
• Closed Valley: While closed valleys offer better protection against leaks, they are not as effective at channeling water away, especially during heavy downpours.

Durability

• W Valley: The metal construction of W valleys makes them highly durable and long-lasting. The raised center also helps prevent water from seeping into the roof structure, further enhancing its durability.
• Open Valley: Open valleys made from metal can be durable, but their exposed nature makes them more vulnerable to the elements.
• Closed Valley: Shingles in closed valleys can wear out more quickly due to water flow, requiring more frequent maintenance.

Aesthetics

• W Valley: W valleys are typically covered by shingles on both sides, making them more visually appealing than open valleys. However, they may not blend as seamlessly into the roof as closed or cut valleys.
• Open Valley: The exposed metal in an open valley may not appeal to homeowners who prefer a more uniform roof appearance.
• Closed Valley: Closed and cut valleys provide the most seamless and polished appearance, as the valley is fully integrated into the roof’s shingle pattern.

Cost

• W Valley: W valleys tend to be more expensive than open or closed valleys due to their specialized design and metal construction. However, their durability and water management capabilities can make them a worthwhile investment in the long run.
• Open Valley: Open valleys are often the most cost-effective option, especially for budget-conscious homeowners.
• Closed Valley: Closed valleys are generally more expensive than open valleys due to the additional labor involved in weaving or cutting the shingles.

Which Valley Type Is Right for Your Roof?

The best type of roof valley for your home will depend on several factors, including your budget, the weather conditions in your area, and your aesthetic preferences. Here’s a quick guide to help you decide:

• Choose a W Valley if you live in an area with heavy rainfall or snow and want superior water management and durability. The dual-channel design is ideal for preventing leaks and reducing water-related roof damage.
• Choose an Open Valley if you’re looking for an affordable, effective option and don’t mind the exposed metal flashing. This is a practical choice for homeowners who prioritize function over aesthetics.
• Choose a Closed or Cut Valley if you want a seamless, polished appearance and are willing to invest in more frequent maintenance to keep the shingles in good shape. This option is great for those who value aesthetics and live in areas with moderate weather conditions.

Choosing the Right Roof Valley for Your Home

Roof valleys are essential for keeping your roof safe from water damage, and choosing the right type can make a significant difference in both the functionality and appearance of your roof. 

Whether you opt for the dual-channel protection of a W valley, the affordability of an open valley, or the seamless look of a closed or cut valley, make sure to consult with a professional roofing contractor to ensure that your roof is equipped to handle your local climate and provide long-lasting protection.

If you’re unsure which roof valley is right for your home, a qualified roofing professional can help you evaluate your options and make the best choice for your needs.

Learn more about roofing components with “Top Signs Your Roof Needs Replacement: When to Repair vs. Replace” and “Is A Drip Edge Necessary? (Top 5 Benefits).”

Is your roof old or leaking? Rescue My Roof can help. Contact us today to get a free estimate.