As it depends on your particular needs and preferences. Open valleys tend to be faster and simpler to install than closed valleys, since they require fewer shingles. Similarly, closed valleys are often a better choice for regions that experience excessive snow and rain, since the flashing on closed valleys is designed to form an almost seamless connection between two adjacent roof surfaces.
Additionally, closed valleys can provide more protection against the elements, while open valleys provide better ventilation and flow of water through valleys.
When considering which type of valley is right for you, be sure to consider the climate and weather in your area, as well as your roofing style and budget. Both open and closed valleys present their own set of advantages and disadvantages, so doing your research and speaking with an experienced roofer will help ensure that you make the right decision.
What is an open valley roof?
An open valley roof is a type of roof which has valleys, but instead of them being closed and sealed at the bottom, the upper part of the valley is open to the air so that it can ventilate the attic.
The purpose of an open valley is to reduce ice buildup and shingle shake, as well as to allow air to move freely through the attic space. Open valleys are typically framed with two pieces of framing lumber that extend down the center of the valley and then out, creating two separate sides of the valley.
These two sides of the valley are then filled with shingles that are fastened down with felt. Additionally, an open valley roof will typically have a built-in gutter system installed on the edge of one side of the valley and a downspout on the opposite edge to allow for water run-off to be collected and diverted away from the roof.
How do you do a closed valley?
A “closed valley” is an installation method for an asphalt shingle roof in which each course of shingles ends at the ridge, with the next layer starting against the previous layer. To properly install a closed valley, you must install a self-adhering membrane across the length of the valley before you install the shingles.
The membrane provides extra protection against water leakage.
To begin, start at the ridge and measure out the valley width every 10 feet (3-meters). Cut two pieces of self-adhering membrane to cover the length and width of the valley; one for the left side of the valley, and one for the right side.
Peel back one-third of the protective backing and press it firmly against the decking. Smooth the membrane and use a stiff bristle brush to ensure it is properly adhered. Peel back the remaining two-thirds of the backing, butting the ends of the membrane firmly against the roof decking.
Repeat this process for the other side of the valley.
Once you have properly installed the membrane in the valley, you can begin installing the shingles. Start from the ridge and run the shingles down both sides of the valley. Make sure to use the appropriate shingle sealant to ensure they are properly sealed and waterproof.
Once you have run the shingles down both sides of the valley, cut the shingle at the edge of the membrane. The membrane should come just before the edge of the shingle. After the shingles are in place and sealed, finish up the roofing installation in the area as usual.
It is important to always install the self-adhering membrane before installing the shingle layers in a closed valley. The membrane will provide additional waterproofing protection and add to the longevity of the roof.
Why is my valley leaking?
It’s important to identify the source of the leak before attempting to repair it, as this will determine the best course of action.
The most common causes of valley leaks are inadequate flashing or a damaged underlayment. Flashing is typically used to cover the joints where shingles come together, and should be properly sealed with a sealant or adhesive to ensure water does not seep underneath the shingles.
A damaged underlayment can also lead to a valley leak, as it should protect the roof deck by providing an additional barrier of protection. If the underlayment has started to break down, it may be allowing water to seep through and cause a leak.
It’s also possible that the issue is with the shingles themselves, as damaged or missing shingles may also be allowing water to penetrate the valleys. Additionally, weather related damage such as ice dams could cause a valley leak, as they can create hidden cracks and openings which allow water to pass through.
It is important to inspect the entire roof, including the valleys, and identify the source of the leak before attempting to repair it. If left untreated, a valley leak can cause a considerable amount of damage and result in costly repairs.
How long do roof valleys last?
The lifespan of a roof valley depends on the materials used for its construction, the environment it is in, and the maintenance it receives. On average, most roof valleys constructed with asphalt shingles can last anywhere from 25 to 40 years.
However, if the asphalt shingles are installed correctly and the roof valley is properly maintained, it can last up to 60 years or more. The life of a wood shingle roof valley may extend up to 30 to 50 years, while a metal valley could last even longer.
In addition, the environment in which the roof valley is constructed will play a factor in its lifespan – areas that have extreme temperatures, heavy snow, and high winds tend to experience more wear-and-tear, which can reduce the life expectancy of roofing components.
Lastly, regular roof maintenance and cleaning can extend the life of roof valleys, so it’s important to keep up with preventative maintenance to maximize its lifespan.
Is valley flashing necessary?
Valley flashing is generally necessary in order to ensure that the roof is properly waterproofed and is able to withstand the elements. Valley flashing is the sheet metal that is installed at a roof’s intersection points or ‘valleys’ and helps to direct rainwater away from the structure.
Without valley flashing, water may easily build up and become stagnant in these areas which can cause serious problems such as water damage, excess mold growth, and even eventual roof collapse. Additionally, in climates where there’s a lot of snow, valley flashing will provide protection from ice damming.
Valley flashing should be properly installed with roofing cement to ensure that it is watertight and can last many years. Making sure that your roof is fully flashed in order to shield against water damage is an essential part of maintaining your roof.
What are the different types of roof valleys?
Including open valley, closed valley, California valley, cut valley, and woven valley.
The open valley is most common and involves two sections of roof that meet at an angle or “v” shape and are then opened up and covered with a layer of shingles or metal flashing. The open valley requires additional flashing to prevent water infiltration and is often the least expensive option.
The closed valley is formed when the two sections that meet at the valley are overlapped with integrated flashings. This method provides a stronger seal than an open valley and is often used on steeply pitched roofs.
It is also more expensive than an open valley.
California valleys involve one piece of metal flashing that is shaped in an inverted “v” and folded over the roof line. It is often used in areas prone to snow, rain, and ice, as the folded shape helps direct water away from the roof.
The cut valley is formed when the roof decking is cut into sections that overlap in a “v” shape. This method requires more work, as the decking must be precisely measured and cut. The cut valley is a stronger and more durable option than an open valley, but it is also more expensive.
Finally, the woven valley involves two roof sections that overlap each other and are fastened together with fascia boards and shingles. It is strongest and most expensive valley option and is often seen on custom homes.
Does GAF recommend open valley?
GAF doesn’t necessarily recommend open valleys, but they do have products that create them. GAF provides WoodHaven tongue and groove products that feature unique shadow lines, creating an attractive open valley look.
This product is popular among customers because it is both aesthetically appealing and offers superior protection against the elements. However, GAF does not guarantee the life of the open valley due to the fact that they are more susceptible to damage from the environment.
In order to maintain the integrity of the open valley, it is important to check the roof at least twice a year for any signs of damage, wear, or leakage. Additionally, it is important to seal, caulk, and weatherproof any joints that are located in the open valley.
This will help ensure that the roof is watertight and will provide maximum defense against the elements.
Should roof valleys be flashed?
Yes, roof valleys should be flashed for added protection. Flashing a roof valley helps protects the eaves and walls from water that flows down into the valleys. Without flashing, water can accumulate in the valleys and eventually cause leaks that can lead to damage over time.
Flashing also helps to enhance the look of the roof and create a more finished look for the home. There are two common types of flashing used when flashing roof valleys. “V” style flashing is the most common type and is made from thin sheets of metal, such as aluminum or copper, that is cut in an inverted “V” shape that follows the slope of the roof around the valley.
Step flashing is an alternate type of flashing that is used in more complex roofing systems and is comprised of a series of short pieces of metal that are each placed into one side of the valley and sealed into place.
How do you make valley flashing?
Valley flashing is a crucial part of roofing, since it helps to divert water away from vulnerable points and locations where two roof planes intersect. To make valley flashing, you’ll need a roll of pre-formed aluminum, several box nails, a utility knife and a hammer.
Start by cutting strips of the aluminum that are long enough to cover the valley. Nail them along the length of the valley making sure to overlap each strip by several inches. Make sure that the bottom edge of each strip is tucked slightly beneath the shingles of each plane, and then secure it with a few more nails.
Once all the flashing is laid in place, use the utility knife to bend the flashing so that it follows the contour of the roof. Visually inspect the valley for any gaps or holes, and adjust the flashing pieces as necessary.
Nail down the ends of each strip to secure the flashing in place, and then apply a coat of roofing cement to seal it. After inspecting again, the flashing is ready for use.
Which side of the valley do you shingle first?
When shingling a valley, it is important to ensure that the valley is lined with ice and water shield, a special membrane designed to protect your roof from moisture and water infiltration. Once the ice and water shield is installed, the recommended approach is to start your shingle installation at the lower side of the valley and work your way up the roof with your shingle courses.
This will ensure that your shingle courses are properly installed, as the valley’s center is much lower than the sides. Be sure to supplement the shingles with roofing cement and provide the appropriate overlap for roof-to-roof and roof-to-wall applications.
Also, take the time to inspect your valley’s installation, both during and after the shingling project. If you see any signs of water staining or bubbling, tear out the old shingles, inspect the valley and make any necessary repairs before you reapply your shingles.