Ella Walter
Installing cap metal when overlapping with valley pan requires careful preparation and attention to detail. A valley is formed by two intersecting slopes on a metal roof, and proper installation is critical to prevent leaks, drafts, or structural damage. The process involves marking and cutting the valley pan to fit, ensuring proper overlap, and securing the pieces with screws and silicone sealant. It is important to follow the manufacturer's instructions and comply with local building code requirements. Additionally, the use of roofing underlayment and proper safety gear is crucial for a successful installation.
| Characteristics | Values |
|---|---|
| Purpose of valley trim | To prevent water, snow, and ice from rushing down the roof and to keep water from moving up the opposite slope and penetrating the roof |
| Installation of valley trim | Should be installed prior to the installation of the metal roofing panels |
| Cost of valley trim | Depends on the gauge, type of paint finish, and the size of the valley trim. On average, it costs $3 to $6 per lineal foot |
| Overhang and overlaps | Account for a minimum 1” overhang and 12” for overlaps |
| Installation steps | Mark the underside of the valley, cut it to fit, and then install it |
| Fasteners | Secure the overlap with fasteners, typically in the valleys of the corrugations |
| Sealant | Apply sealant or butyl tape between the sheets for extra protection against water infiltration |
| Chalk lines | Used to mark straight guidelines on flat surfaces |
| Ridge cap installation | Fasten the ridge cap with metal-to-metal fasteners at twelve-inch intervals |
| Overlapping ridge cap | Apply silicone sealant 2 inches from the inside of the overlap and overlap the ridge cap by 6 inches |
| Valley pan installation | Install the valley pan before putting in the offset cleat |
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What You'll Learn
Prepare the roof with underlayment and eave trim
Before installing cap metal when overlapping with valley pan, it is important to prepare the roof with underlayment and eave trim. Here is a step-by-step guide to help you through the process:
Prepare the Roof with Underlayment:
Firstly, ensure that proper roofing underlayment is installed. Underlayment is a crucial component of any metal roofing system, providing an extra layer of protection against the elements. It should be installed prior to the eave flashing and valley trim to create a weather-tight barrier.
Install the Eave Trim:
Eave trim, also known as eave flashing, is the metal flashing that covers the low side of the building. It works in conjunction with the underlayment to prevent water from blowing underneath the roof. Here are the steps to install it:
- Place the eave trim over the underlayment, ensuring it sits securely.
- Use screws to secure the eave trim in place. The recommended spacing is one screw located at 8 inches from each end of the eave flashing, and then screws spaced twelve inches apart in between.
- Cut an eight-inch strip of suitable underlayment material, such as Sharkskin Ultra SA, and install it over the eave flashing.
- You will now have underlayment both underneath and over the eave trim, providing extra protection.
Prepare for Valley Trim Installation:
Now that the underlayment and eave trim are in place, you are ready to begin installing the valley trim. Valley trim is crucial to preventing water from travelling up the opposite slope and penetrating your roof. Here are the initial steps to prepare for valley trim installation:
- Mark and cut the valley trim to fit where the eaves meet at the inside corner, ensuring it aligns with the ridge line and eave trim edge.
- Place tape sealant or silicone sealant between metals to prevent water from getting underneath.
By following these steps, you will have successfully prepared your roof with underlayment and eave trim, ready for the installation of cap metal when overlapping with valley pan.
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Measure and cut the valley pan to fit
To measure and cut the valley pan to fit, you will need to follow a few steps. Firstly, measure the height of your valley's seam. Use this measurement to mark the centre of your seam. Then, lay the valley at the ridge and trace the top outline.
Next, you will need to cut the panels at an angle for the valley. After cutting, bend the hem end of the panel and hook it with a cleat. This will help to hide the fasteners. You will then need to install the eave trim with the continuous cleat.
Now, you can measure and cut the valley pan to fit. Place the valley in position and mark the underside, cutting it so that it fits where the two eaves join at the inside corner. Mark the valley and overhang it slightly. Cut the valley to fit the ridge line and mark and cut the underside to fit at the eave of the roof.
Remember to account for a minimum of a 1" overhang and 12" for overlaps. You will also need at least 3" for ridge prep. Once you have made your cuts, you can install the valley pan.
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Secure the valley pan with screws
When securing the valley pan with screws, it is important to follow a careful procedure to ensure a strong and watertight seal. Here is a step-by-step guide:
First, place the valley pan in the desired position, ensuring it overlaps with the valley trim by a minimum of 12 inches. This overlap will create a strong seal and prevent water from penetrating the roof. Mark the position of the valley pan with a carpenter's pencil to ensure accurate placement.
Next, apply a layer of silicone sealant 1 inch from the eave trim edge of the valley pan. This step is crucial as it will create a watertight seal and prevent leaks. Use a high-quality silicone sealant designed for roofing applications.
Now, secure the valley pan in place using 10# x 1" pancake screws. Space the screws approximately 12 inches apart and position them 1 inch away from the edge. These screws will hold the valley pan securely in place and provide structural integrity to the roof.
After securing the valley pan, cut off any excess material from the short corners by removing the 1" tabs on each side. This will ensure a neat finish and allow for proper overlap.
Finally, apply silicone to the bottom of the valley overlap, 1" from the edge. Secure this overlap with additional 10# x 1" pancake screws, placed 12 inches apart. This extra layer of silicone and screws will ensure a strong and durable seal, protecting your roof from water damage.
By following these detailed steps, you will securely fasten the valley pan with screws, creating a robust and watertight roof assembly.
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Apply silicone sealant to the overlap
When installing cap metal when overlapping with a valley pan, applying silicone sealant to the overlap is a crucial step to ensure a watertight seal. Here are detailed instructions for this process:
Before applying the silicone sealant, it is important to prepare the surface properly. Clean the overlap area thoroughly, removing any dirt, debris, or residue. Ensure that the valley trim fits perfectly and is secured with screws. The valley should overlap by a minimum of 12 inches, and the silicone sealant should be applied 1 inch from the bottom of the valley overlap.
When ready to apply the silicone sealant, choose a high-quality product specifically designed for metal roofs. The pure silicone Seamsil system, for example, is recommended by HD Sharman for its flexibility and durability. Ensure that you have the necessary tools, such as a caulking gun or sealant applicator, and wear gloves for protection.
Apply the silicone sealant evenly and generously along the overlap, maintaining a consistent distance of 1 inch from the edge. Work in smooth, continuous motions to create an even bead of sealant. Ensure that the sealant is applied to the entire length of the overlap, filling any gaps or joints to prevent water seepage. Pay close attention to the manufacturer's instructions for the specified thickness of the sealant, as applying too little can compromise its effectiveness.
After applying the silicone sealant, carefully inspect the work to ensure that the sealant has been properly applied and no gaps or thin areas are left unprotected. Allow the sealant to cure according to the manufacturer's instructions, as curing times may vary depending on the product and environmental conditions.
By following these instructions and choosing the right silicone sealant, you can effectively seal the overlap when installing cap metal with a valley pan, ensuring a watertight barrier that protects your roof from water damage, rust, and corrosion.
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Fasten the cap metal with metal-to-metal fasteners
When installing cap metal that overlaps with a valley pan, it is important to select the appropriate metal-to-metal fasteners to ensure a secure and long-lasting installation. Here are some detailed instructions on how to fasten the cap metal with metal-to-metal fasteners:
First, determine the total thickness of the materials being joined, as this will influence your choice of fasteners. Metal-to-metal fasteners typically come in two types: self-drilling and self-tapping. Self-drilling screws are an all-in-one solution, drilling through the panels and substrate while forming the threads. When using self-drilling screws, ensure the point style is long enough to completely finish drilling before engaging the threads into the metal. Self-tapping screws, on the other hand, require you to pre-drill holes of the appropriate size and thread type for the thickness of the materials.
For the installation process, it is recommended to use a screw gun with a variable clutch-and-depth sensing nose piece. Avoid using impact drivers or standard drills. The appropriate speed for your screw gun will depend on the type of screw and the material you are working with. For installation into rollformed purlins or girts, use a 2,500-rpm screw gun, and for structural steel or self-tapping screws, reduce the speed to 1,000 rpm. Allow the screw to work its way through the material without applying too much force to prevent overheating and drill point failure.
When selecting the fasteners, consider the diameter and head style. Common diameters include #8, #10, #12, and #14, with lengths ranging from 1/4-inch to 8 inches. Head styles vary, with hex washer heads and low-profile heads being popular choices. For outdoor applications, choose fasteners with corrosion-resistant finishes or coatings to ensure longevity.
Additionally, pay attention to the specific requirements of your project. For instance, when attaching roofing sheets to a purlin, a #12 with a T-3 self-drilling point is suitable for a 0.036-inch to 0.210-inch total steel thickness. If you are performing roof lap stitching, a 14-14 x 7/8 inch T-1 screw with a mini-drill point can handle a total steel thickness of 0.024-inch to 0.095-inch.
By following these instructions and choosing the appropriate fasteners for your project, you can confidently fasten the cap metal with metal-to-metal fasteners when overlapping with a valley pan.
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Frequently asked questions
A valley pan is a “W”-shaped piece of metal that is installed on the valley line of a roof to prevent water, snow, and ice from rushing down the roof.
The purpose of installing a valley pan is to create a break and ensure that water, snow, and ice are channelled to the end of the valley, preventing them from rushing down the roof and skipping up onto the other side.
To install a valley pan, follow these general steps:
- Measure and mark the underside of the valley pan to fit the ridgeline and eave of the roof.
- Cut the valley pan according to your markings.
- Place the valley pan into position, ensuring proper overlap with the eave trim.
- Secure the valley pan with screws and sealants.
- Repeat the process for additional valley pans, working your way up to the ridge of the roof.
When installing a valley pan, here are some key considerations:
- Ensure proper roofing underlayment is in place before installing the valley pan.
- Account for the necessary overhang and overlap when measuring and cutting the valley pan.
- Use the appropriate tools and safety gear, such as gloves, goggles, and non-slip shoes.
- Refer to the manufacturer's installation guide and comply with local building code requirements.
