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    Home | How to do it | How to Install a Metal Roof Valley

    How to Install a Metal Roof Valley

    install a metal roof valley

    Metal roofing may come in all shapes and sizes, but one thing you can be sure of is that it looks fantastic on just about any home. They also provide plenty of long-lasting benefits. A metal roof’s lifespan can last up to 50 years, it’s energy-efficient, resistant to fire, and it comes in beautiful styles that match any home or neighborhood. With that being said, it’s hard to imagine why any homeowner wouldn’t want to get a metal roof.

    But we’re not here to talk about how great metal roofs are in this article; we’re here to talk about valleys on metal roofs and how to install them. By reading this blog, you’ll learn more about what roof valleys are, why they’re important, and how to form a valley on a roof.

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    At Legacy Service, we’re dedicated to improving your house’s exterior so that you’re completely satisfied with your home. Along with roofing services, we also provide siding installation and replacement, windows and doors installation and replacement, and gutter installation. If you’re looking to build the home of your dreams, we’re the team to call. Contact us at 215-798-9790 or by filling out a form at to learn more and receive a free estimate.

    valley of a roof

    What is the valley of a roof?

    The valley of the roof is formed where two slopes meet. Water collects there to flow off of the roof. The installation method for metal roofing valleys is crucial because they’re risks for serious leaks when they’re not installed properly. There are two main types of valleys:

    Open Valleys: With this type, the valley line is covered by a valley component instead of the main roofing panel system. They’re protected by a combination of underlayments and a metal valley component. First, an ice and water shield covers the decking. Then, an underlayment goes over the barrier. Finally, a “V” or “W” shaped piece of metal is installed on top. It’s called an open valley because the metal remains open to carry water off the roof.

    Closed Valleys: Closed valleys are more often used with asphalt roofs instead of metal ones. The valleys are either woven into the shingles or they meet to form a straight line down the center of the valley. They’re typically not recommended for metal roofs because they’re designed to carry water under the panels but can fail over time because they get clogged.

    All in all, an open valley is recommended with a metal roof. Continue reading to learn about why they’re important and the best methods of installation.

    Why Is It Important?

    Metal valleys on a roof are important because metal is typically the most durable material. It provides a long-lasting solution since it’s not only extremely versatile but it also can be used in almost any situation, and it resists damage from rain, wind, hail, and fallen debris.

    Metal valleys can add longevity and durability to almost any roof. One of the best things is that they effectively protect other parts of your roof, from the roof deck to the felt and shingles. When all of the roofing components are working properly, your roof’s lifespan will be maximized.

    Valley Trim Preparation

    Valley Trim Preparation

    So, how do you put a metal roof on a valley? Unless you have plenty of experience with roofing, we suggest hiring a team of professionals to complete this project. Working with metal roofs and installing valleys can be challenging, especially for someone who doesn’t typically do this type of work. After all, no one wants to be sitting on their roof in tears of frustration after a long day.

    However, it’s still good to know valley roofing techniques and how the process is done. So, let’s get started learning about valley trim preparation:

    1. Once the eave trim is installed with the continuous cleat, install the valley pan before putting in the offset cleat. This is called a “W” Valley. It has a raised section to keep water, snow, and ice from rushing down the roof and make sure that they get channeled to the end of the valley.
    2. Put the valley into place, mark its underside, and cut it so that it fits nicely where the two eaves join at the inside corner. Mark the valley and overhang it a little bit. Make sure it’s cut to fit the ridgeline.
    3. Mark the underside and cut it to fit at the eave of the roof, then mark the underside of the valley, tracing alongside the eave trim’s edge. Then, take the valley to the table, make your cuts, and go back to install it.

    Let’s take a look at what to do next.

    Cut Metal Roofing to Fit Valleys

    How to Cut Metal Roofing to Fit Valleys

    Roof valleys are similar to gutters, except for the fact that they have steeper pitches and the stakes are much higher when it comes to installing valleys. You’ll have to keep that in mind when you cut metal roofing to fit the valleys.

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    Here’s how you can do it:

    1. Measure a right triangle from the center of the valley at the bottom straight up to the ridge and over to the center of the valley.
    2. From your horizontal measurement, determine how many rows you’ll have.
    3. Divide your vertical measurement by that number. Each row will be that number shorter than the previous one.
    4. Measure up whichever side will be shorter and mark a line between it and the bottom on the other side.
    5. Make the cut. If you’re just overlapping the valley, it should be close enough. If you’re locking it into the valley, you might need to adjust the angle slightly with your fold.

    Learn more about marking angles and how to cut metal roofing for valleys.

    Bending the Eave Clip

    Now it’s time to bend the eave clip so that the panel can be installed. Start by transferring the measurements to the back of the panel. You’ll want to add an inch for a hem so it can be clipped into the offset cleat in the valley and along the eave. Once everything’s all set, it’s time to install the valley panel.

    How to Install Metal Roof Valley Panel

    Most homes are composed of multiple additions that result in the need for valleys. The metal that’s used for roofing valleys is more similar to roof flashing than it is to roofing material. Here are the steps to installing valley flashing for metal roofs:

    1. Lay a valley metal roof flashing panel in the valley at the bottom eave. Then, put one screw into each of the bottom corners about one inch from the edges.
    2. Place the next flashing panel towards the ridge of the roof, overlapping the first panel by about four inches. Again, put one screw into each of the bottom corners.
    3. Put evenly spaced screws along both side edges of the first flashing panel. Depending on the panel size, the spacing may differ. However, 16 inches on center is a common spacing that can be used for most panel sizes. It also helps to use a tape measure for screw spacing.
    4. Repeat the first three steps on remaining valley flashing panels while working your way to the ridge of the roof.
    5. Use tin snips when necessary to trim the final valley flashing panel to make it fit on your roof.

    Get Started on Your Valley Flashing Installation Today!

    If you’re looking for how to install metal roofing in a valley, please look no further than our team here at Legacy Service. Whether you need metal roofing valley instructions or a company that will provide the service for you, you can count on us. Installing valley flashing on a metal roof can be a difficult job, especially for someone who isn’t used to working with roofs. That’s why it’s good to hire professionals who can take care of the job for you. When it’s done correctly, roofing valleys protect your home from all types of weather, from rain and snow to sleet and hail.

    At Legacy Service, please feel free to contact us for any of your home exterior needs. Our team of experts provides service for roofing, siding, windows, doors, and gutters. Whether you’re in need of a roofing replacement or siding installation, you know who to call. You can reach us at 215-798-9790 or by filling out a contact form here.

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