Emilie Meyer
Installing a valley pan on your roof can be a challenging task, especially if you're not accustomed to working at heights or with roofing materials. A valley pan, also known as a metal valley flashing, is essential for draining water away from your roof structure, preventing moisture damage. Before beginning the installation process, it's crucial to understand the different types of roof valleys, such as open and closed valleys, each requiring specific installation techniques. Proper preparation, accurate measurements, and careful cutting of metal roofing panels are key steps in ensuring a successful installation that protects your home from water damage and other weather conditions.
Characteristics and their Values
| Characteristics | Values |
|---|---|
| Roof valley type | Closed valleys, open valleys |
| Installation process | Install eave trim, install valley pan, put in offset cleat |
| Tools | Tin snips, roofing nails, screw |
| Cutting panels | Cut panels from the ground, cut at an angle for the valley, cut to fit the ridgeline and eave of the roof |
| Sealing | Seal with roofing nails, apply sealants if necessary |
| Maintenance | Regularly clear debris and leaves, inspect for damage, conduct maintenance |
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What You'll Learn
Understanding roof valleys and flashing
Roof valleys are channels created where two different roof slopes meet, or where a roof changes direction. Roof valley flashing is a specially designed material, typically made of metal, that is installed in roof valleys to direct water away from the roof and into the gutters. Metal valley flashing, also known as metal valley trim, drains water away from the structure, helping to prevent moisture damage.
There are two main types of roof valleys: open and closed. Open valleys have an exposed centre that is covered by a metal flashing panel. This type of valley quickly sheds water, making it ideal for rainy areas. However, open valleys may collect debris more easily and require regular cleaning. A closed valley, on the other hand, is completely covered or closed up with surrounding roofing materials such as shingles. This provides a seamless appearance, but the valley is still vulnerable to water damage. Water flows over the shingles before entering the gutters, which helps prevent debris accumulation. Closed valleys are suitable for areas with less rainfall or where aesthetics are a priority.
Another type of roof valley is the California roof valley, which is similar to a closed valley as the flashing material is installed underneath the roofing material. The main difference is in the installation process. For a California roof valley, shingles from one roof surface are installed over the valley and used as the basis for the shingle installation on the other roof surface. California valleys are ideal for areas with heavy rain or roofs with steep slopes as they can handle more water without overflowing, providing better protection against leaks.
Metal is a common choice for roof flashing, with options including galvanized steel, copper, and aluminum. Copper is the most popular option, offered in 16 oz. and 20 oz. weights. Freedom Gray® (zinc/tin-coated copper) and Galvalume Plus (24 gauge) are also available. Plastic roof flashing, made from PVC or similar materials, is a good choice for regions with mild climates. It is lighter and more affordable than metal flashing, effective at keeping water out, and has a long lifespan. However, it may not be as strong as metal in harsh weather. Rubber roof flashing, or EPDM flashing, is made from man-made rubber and is flexible, making it easy to install. It also effectively prevents water seepage.
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Cutting and preparing the panels
When cutting and preparing the panels for a valley pan roof installation, there are several important steps to follow. Firstly, it is crucial to use the proper tools when cutting metal roofing to fit the valleys. Avoid using tools that will melt the galvalume coating, such as a chop saw, torch, or abrasive blade. Instead, use tin snips designed for cutting metal, and always cut the panels from the ground to avoid damaging the roof with debris.
Before cutting, you need to measure and mark the panels accurately. Measure a right triangle from the centre of the valley at the bottom straight up to the ridge and over to the centre of the valley. Determine the number of rows by dividing your vertical measurement by the number of horizontal measurements. Mark a line for the cut, ensuring the panel is slightly longer if you're just overlapping the valley, and adjusting the angle slightly if you're locking it into the valley.
Now, cut the panels at an angle, and bend the hem end of the panel to hook it with a cleat. This method keeps the fasteners hidden, which is ideal for architectural aesthetics. Transfer your measurements to the back of the panel, adding an extra inch for the hem, so it can be clipped into the offset cleat.
Once you've cut and prepared the panels, you can install the valley pan before putting in the offset cleat. This is called a "W" valley, and it helps to channel water, snow, and ice to the end of the valley, preventing it from rushing down the roof. Put the valley into place, mark its underside, and cut it to fit neatly where the two eaves join at the inside corner. Mark the valley with a slight overhang, ensuring it fits the ridgeline. Then, mark and cut the underside to fit at the eave of the roof, tracing along the edge of the eave trim.
After making these cuts, you can bring the valley panel back to the roof and secure it temporarily with a screw, leaving room to work on the offset cleats.
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Installing the flashing panels
Installing flashing panels is a crucial step in ensuring your roof valley effectively channels water, snow, and ice to the gutters, preventing moisture damage. Here is a detailed guide on how to install flashing panels:
Prepare the Flashing Panels
Before placing the flashing panels, it is essential to measure and cut them to fit your roof accurately. Mark the underside of the flashing panel, considering the overhang and the fit at the ridge line and eave of the roof. Trace along the edge of the eave trim, then take the panel to a table to make precise cuts. This process ensures a neat fit where the two eaves join at the inside corner.
Install the First Flashing Panel
Lay the first flashing panel in the valley at the bottom eave. Securely fasten this panel by placing one screw into each of the bottom corners, approximately one inch from the edges. This initial panel sets the foundation for the rest of the installation.
Install the Second Flashing Panel
Place the second flashing panel towards the ridge of the roof, overlapping the first panel. A standard overlap is about two to four inches. Secure the second panel with screws in the same manner as the first, ensuring the bottom end aligns with the bottom of the roof. The lower screws should penetrate both flashing panels to create a watertight seal.
Install Subsequent Flashing Panels
Continue installing flashing panels, overlapping each previous panel and securing them with screws. Place screws along both side edges of each panel for added stability. Ensure that the panels are level and properly aligned to create a seamless valley.
Trim and Secure the Panels
Once you reach the roof's peak, carefully trim any excess flashing using sharp tin snips designed for cutting metal. Remove any protruding edges or unnecessary material for a tidy and professional finish. Finally, secure the top edge of the flashing by nailing it down with roofing nails spaced every six inches.
Final Inspection
Conduct a thorough inspection to verify that all joints are tightly sealed. Ensure there are no gaps or vulnerabilities that could lead to water leakage. Examine the flashing panels for any signs of movement, and apply appropriate sealants if needed to reinforce the flashing and protect against water infiltration.
Remember, proper installation is critical to the effectiveness of your roof valley. With careful installation and regular maintenance, your roof will be well-protected from the elements for years to come.
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$12.89
Securing the panels with nails or screws
When installing a valley pan on a roof, there are several steps to follow to ensure a secure and effective installation. Here is a detailed guide specifically focused on securing the panels with nails or screws:
First, prepare the roof by installing the eave trim with a continuous cleat. This provides a base for the valley pan to be installed. Mark the underside of the valley pan, tracing along the edge of the eave trim, and cut the pan accordingly so that it fits neatly where the two eaves join. Ensure you cut the valley pan to fit the ridgeline and the eave of the roof accurately.
Next, place the valley pan into position. Secure it temporarily with a screw placed a little higher up, allowing you to work on the offset cleats. This screw should be approximately one inch from the edge. For a "W" valley pan, which features a raised section to control the flow of water, snow, and ice, ensure the screw is placed in the correct position to achieve the desired overhang.
After securing the valley pan temporarily, install the offset cleats. These help to lock the valley pan into place. Once the cleats are in position, you can secure the valley pan more permanently. Use roofing nails or screws for this. Ensure the nails penetrate both the valley pan and the flashing panels to create a watertight seal. Space the nails or screws evenly, approximately every six inches, along the top edge of the valley pan to firmly attach it and ensure it can withstand the elements.
Finally, conduct a thorough inspection. Verify that all joints are tightly sealed and there are no gaps or vulnerabilities that could lead to water leakage. Ensure all necessary safety precautions are taken during the installation process, and consider hiring professionals if you are uncomfortable with any aspect of the procedure.
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Trimming and finishing
Preparation:
Before beginning the trimming process, it is essential to have the proper tools. Avoid using tools that can damage the galvalume coating, such as a chop saw, torch, or abrasive blade. Ensure you have sharp tin snips specifically designed for cutting metal. Mark the valley pan for cutting by placing it in position and tracing the underside along the edge of the eave trim.
Cutting:
After marking the valley pan, remove it and make the necessary cuts on a table or a flat surface. Cut the panels at an angle to fit the valley, ensuring they align with the ridge line and eave of the roof. If you need to join multiple panels, overlap them by approximately two to four inches and secure them with roofing nails or screws.
Trimming:
Once the panels are cut and installed, use tin snips to trim any excess flashing. Cut off any protruding edges or unnecessary material to create a neat finish. Ensure that all joints are tightly sealed and there are no gaps or vulnerabilities that could lead to water leakage.
Finishing:
After trimming, secure the top edge of the valley pan by nailing it down with roofing nails spaced every six inches. Inspect the entire installation to verify that all joints are sealed tightly and that there are no areas prone to water leakage. Examine the flashing panels for any signs of movement, and apply appropriate sealants if necessary to reinforce the flashing and protect against water infiltration.
Maintenance:
To ensure the longevity of your installation, schedule regular maintenance. Keep the valley area free from debris and leaves that may obstruct water flow. Regularly inspect the flashing for any damage or wear, and address any issues promptly. With proper care and maintenance, your valley pan installation will effectively protect your roof for years to come.
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Frequently asked questions
A roof valley is similar to a gutter, but with a steeper pitch. It is created by two intersecting slopes.
A valley pan, also known as a valley flashing, is a metal piece that drains water away from the structure of a building.
First, lay a valley metal roof flashing panel in the valley at the bottom eave and screw in the bottom corners. Place the next flashing panel towards the ridge of the roof, overlapping the first panel. Screw the corners and sides of the flashing panel. Finally, trim any excess flashing using tin snips and seal the flashing.
There are two types of roof valleys: open valleys and closed valleys. Open valleys have an exposed centre covered by a metal flashing, while closed valleys are completely covered with roofing materials like shingles.
