Trim The End Of The Flashing
You may need to trim off the end of the flashing a little. Climb up to the top of the roof, and trim any excess flashing off using a sharp set of tin snips* that are specifically designed to cut metal. Finally, nail down the top of the flashing after you have cut away any excess. Now that you are finished, the roof should last for many years with minimal maintenance.
* Pro Tip: The handles of all tin snips are color-coded. Yellow is for making straight cuts while Green is for left-hand cuts and red is for right-hand cuts. For left cuts, the scrap will be on the right and for the right cuts, the scrap will be on the left. Off-set tin snips help keep your hands away from sharp metal edges as you cut it.
Valley Flashing Requirements For Asphalt Shingle Roofs
Adapted/paraphrased with permission from Best Practices Guide to Residential Construction, chapter on BEST ROOFING PRACTICES:
Because valleys catch water rushing down two roof planes,they are likely places for roof leaks. Leaks can be causedby water rushing up the opposite side of the valley or fromwear and tear caused by the channeled water, snow and icebuildup, or traffic on the roof.
For that reason all valleys should start with a leak proof underlayment system to back up the shingle or metal valley detail.
The Three Methods To Shingle A Roof Valley
1. Woven Valley Shingle Installation
To achieve a woven valley installation, a roofing professional lays shingles in the valley and weaves them together. Some homeowners prefer the consistent look that a woven valley provides. But, if the shingles are not laid in the valley properly, a woven valley may not lay flat, creating bumps and detracting from the overall look of the roof.
The woven valley shingle installation method does not call for roofing cement, relying instead on the weave pattern to protect from water infiltration. So, if you are installing a woven valley, you must push the shingles snugly into the valley, while not nailing within six inches of the valley center. If this is not done properly, hollow space may develop under the shingles.
This bridging is a serious problem for the durability of a roof. The empty space makes the shingles vulnerable to penetration, either by footsteps, hail or other debris. For this reason, installing some manufacturers shingles in a woven valley may void their limited warranty.
2. Closed-Cut Shingle Valley Installation
Closed-cut valleys, also called closed valleys, are installed quickly and have a cleaner, sharper look than woven valleys. From the ground, it looks as though the shingles meet in a clean line in the center of the valley. One layer of shingles actually crosses the valley beneath the other.
A Variation of Closed-Cut Valley: the California Valley
3. Open Valley Shingle Installation
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How To Fasten Valley Trim On A Metal Roof
Avoid The Following Common Errors:
- Fasteners placed in the exposed center area
- Punctures in the center of the valley
- Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.
- Installing a closed valley when shingle manufacturer does not approve of.
- Installing corrosive type metal flashing in valley
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Bending The Eave Clip
Now its time to bend the eave clip so that the panel can be installed. Start by transferring the measurements to the back of the panel. Youll 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 everythings all set, its time to install the valley panel.
Roof Valley Flashing Materials
If youre having new roof valleys installed, either as part of a repair job or as a reroofing job, youll need to choose a flashing material. IKO recommends you choose a galvanized metal that is, at a minimum, 28-gauge and 24 inches wide. Your professional roofer will also confirm with the building codes to be sure your chosen flashing material meets the requirements.
Possibilities for flashing material include:
- Steel: If you use steel it must be rust- and corrosion-resistant. Options include galvanized steel, zinc-steel alloys and stainless steel. A lesser-known option is painted terne. To make it, manufacturers apply tin and lead coating onto steel.
- Aluminum: While aluminum flashing does not last as long as other flashing materials, it is cost-effective and flexible enough to get the job done.
- Copper: Copper is a beautiful, traditional roofing material that is also used in flashing other roof components. In an open metal valley, copper will develop a patina. For valley purposes, your roofer can use high-yield copper or cold-rolled copper
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What Is A Valley Metal
A metal valley is a pre-bent roof material that protects the valley of your roof prone to water damage or leaking.
The proper way to install a metal valley is on top of an ice and water shield, creating an effective passageway for rainwater into your gutter and keeping your roof dry and well-protected.
It Adds Protection To Parts Of The House
The primary reason for installing a roof flashing is to enable water to flow away from vulnerable areas to avoid leaks. Some of these weak areas are where the shingles or the roofing sheets meet, like the chimney or wall.
If you dont do the flashing well or use a poor-quality flashing material, you will experience leak problems. If you are not sure of the best flashing material to choose or the best installation method, Roof Masters will hook you up with a professional roofer.
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Some Factors Contribute To The Functioning Of The Flashing
It is essential to know that all the flashing will not function the same. Therefore, some factors like the material of the flashing are necessary to consider when buying.
You should also ensure you get a good installer because an expensive, good-quality flashing will not function as it should if you dont install it correctly. Our roofers are well experienced, and you will not regret choosing to work with them.
Can You Show Me An Example Of Bad Valley Metal Installation
If youre looking for an effective and durable way that increases the longevity of your roof valley, choose metal. Before installing, make sure you consult a roofing professional to lead with the installation.
We hope this review was able to help you! Before you go, wed love to hear your thoughts below!
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Why Focus On Your Roofs Valleys
Valleys are a critical part of a roof because they see the most water flow. Ensuring that you have the best-performing type of roof valley installed will help give your roof the longest life possible.
To recap, California valleys and woven valleys may limit the life span of your roof valley. They could even void your limited warranty. When it comes to the question of open metal valley vs. closed valley roofs, IKOs roofing experts believe that open metal valleys are the better performer. This roof upgrade to an open metal valley gives your roof better resistance to water penetration. Plus, open metal valleys shed debris, snow and ice faster than any roof valley type that uses shingles in the valley.
If you want to get the longest life and best performance from your roof, check out IKOs Roofing 101 guides. We offer straightforward explanations of roofing basics to help you be more informed about how your roof should look and function.
Inspect And Replace Plywood
Next it is important to inspect the plywood to ensure that there is no rot in the plane of the roof where you intend to install the valley. Once rot starts on a board or piece of plywood it cant be stopped and will continue getting progressively worse for years to come. Therefore, it is absolutely imperative that any plywood areas that have the slightest bit of rot be replaced, particularly in the valley where water flow demands will be the highest anywhere on the roof field.
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By Step Metal Roof Installation
Installing a metal roof is a very complex process. It requires a lot of skills and knowledge for the installed roof to last for many years. You need to know the sequence of the process and have all the necessary equipment for high-quality and safe work.
Monarchy Roofing has been installing various metal roofs in Toronto and nearby cities for many years. There are many different metal roofing systems available on the market. Although the concept and most of the steps for installation are the same for all metal roofing systems, we need to keep in mind that each one may have its own specific requirements and guidelines for installation.
In this article, we will talk in detail about the step by step installation of the metal tile roofing systems with exposed fasteners. Lets share the secrets that professional metal roof installers use and talk about all the tools that are needed for this job.
Open Valley Roof Flashing
Open valley roof flashing is a type of flashing that is used on roofs with open valleys. This type of flashing is installed over the valley liner and extends up the sides of the roof. The purpose of open valley roof flashing is to prevent water from entering the valley and causing damage to the roof.
The information provided on this website is not intended to be an advertisement or product. The details and specifications of roof valley flashing for best construction are covered in this article. We will go over the three basic roof valley styles: open valley, closed valley, and woven valley. Roll roofing, on the other hand, is not self-repairing around nails, and it may be appropriate for use as an underlayment on asphalt shingle valleys. Roof valley flashing metal for open roof valleys should be 26-gauge galvanized steel or equivalent noncorrosive, nonstaining metal. Metal valley linings should not be more than 8 or 10 feet long and should be 2 to 3 feet wide. The use of clips allows for the movement of people in the valley as temperatures change.
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Removal Of The Old Shingles And Deck Repair
You may have two options here. First option is to remove the old roofing. All shingles nails and tarpaper are removed. It is very important to remove any nails that were used to attach the old roof.
Demolition of the old covering will allow access to the plywood and deck. In some cases, it may be necessary to replace old plywood that is water damaged and rotted away. Second option is to leave one layer of shingles and place double strapping over existing shingles. When more than one layer of shingles is installed on the roof, it is advised to completely remove both layers of shingles and waterproof the plywood see next step.
Keeping Your Roof Valley In Good Condition
Once you have your roof valleys repaired or installed, there are a few things you can do to make sure they stay in good condition.
- Prevent ice dams:Ice dams commonly form in roof valleys. All roof valleys should have a layer of ice and water protector beneath the flashing or shingles for protection. In valleys, this layer has to be a minimum of 2-feet wide, though roofers may end up using a full-sized 36-inch roll. Your building code may require it to be wider. Further, open metal valleys tend to shed ice faster than other valley types.However, homeowners should still minimize ice dams in the valley when possible. The number one cause of ice dams is actually improper attic insulation, not a problem with the roof itself. To prevent ice dams, youll need to talk to a roofer about your attic insulation options. If your insulation is in order, they may have other solutions to help you prevent ice dams in the valley and elsewhere.
- Remove debris: Leaves, tree branches and other debris tends to collect in the roof valleys. Debris can interrupt the flow of water from your roof, encourage algae and mold growth, as well as increase the likelihood of an ice dam. It is important to remove debris from your roof regularly when cleaning out your gutters. Open metal valleys typically shed debris faster than other valley types, which is why they are strongly recommended for lower-pitched roofs, which tend to collect debris.
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Should You Install The Metal Roof Yourself
Many homeowners wonder if they can install a metal roof on their own. There are many step by step metal roof installation guides on the Internet, after looking at them you can decide that this is a simple process.
Unfortunately, many homeowners become frustrated when starting on their own. You will have to face many difficulties in this case. It will be necessary to assess the current condition of the roof of the house, make calculations, order and deliver material, demolish the old roof and repair the deck. Note that this is still before the roof installation work has begun.
You save yourself from all the difficulties by hiring a professional company. You do not have to solve many issues in which you are most likely not competent. You will save your time and also get a guarantee that the installation of a metal roof is done with high quality. The decision to install a metal roof yourself must be balanced and you must understand all the responsibilities.
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 theyre risks for serious leaks when theyre 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. Theyre 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. Its 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. Theyre typically not recommended for metal roofs because theyre 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 theyre important and the best methods of installation.
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How To 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 roofs lifespan can last up to 50 years, its energy-efficient, resistant to fire, and it comes in beautiful styles that match any home or neighborhood. With that being said, its hard to imagine why any homeowner wouldnt want to get a metal roof.
But were not here to talk about how great metal roofs are in this article were here to talk about valleys on metal roofs and how to install them. By reading this blog, youll learn more about what roof valleys are, why theyre important, and how to form a valley on a roof.
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At Legacy Service, were dedicated to improving your houses exterior so that youre 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 youre looking to build the home of your dreams, were 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.
Direct To Deck Metal Roofing Installation A Batten
Some metal roof panels are installed on battens while others are installed directly to the roof decking on an elementary level. Battens are rows of 1×2s nailed to the roof first to provide a racking system for the roof panels to fasten into. This was another installation method derived from old school metal roofs installed over barns so all panels installed over battens also have exposed fasteners. Putting down battens raises the level of the roof which means gutters have to be raised and the roof level can sometimes get too high on homes with dormer windows the roof can begin to run into the bottom of the windows
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