Each roof requires flashing because it is such an important element of a roofing structure. Flashing is a thin material that directs water from roof areas like chimneys, walls, or valleys.
In my experience with various roofing projects, failing to install flashing properly has led to significant issues like leaks, mold, and even structural damage. An effective flashing installation can save homeowners from expensive repairs in the future.
If you’re currently looking to perform a flashing project on your roof, you will need to know the gist of how it’s done. If you happen to have a flat roof, the following guidelines on installing flat roof edge flashing can give you information on its basic steps.
Additionally, installing a drip edge is critical as it prevents water from seeping into the structure, which can lead to the degradation of the roof and the building itself. Based on my firsthand experience, a well-installed drip edge can significantly extend your roof’s lifespan.
How Do You Seal the Flat Roof Edge Flashing?
Different material options can be used when it comes to flash roof installation. The most common are steel, copper, aluminum, and rubber roof drip edge. Different building codes may require specific flashing material or a minimal thickness.
For instance, in many of my projects, I have seen that steel and aluminum drip edges are preferred due to their durability. However, the choice of material should align with local building codes.
These materials comply with the standards and provide long-term protection against harsh weather conditions.
One of the most important roof edge flashing components is the sealant. Roofing professionals most commonly use nail and epoxy, and it will be used in the tutorial below. In my experience, sealants are critical in ensuring the longevity of flashing.
The combination of nails and epoxy creates a robust barrier against water infiltration. A well-applied sealant can be the difference between a dry attic and a water-damaged ceiling.
Here are four steps for installing drip edge on a flat roof:
1. Determining the location of installation
As explained previously, roof flashing protects against water entering a house or a building by covering areas like vents or chimneys. It involves bending, resting, and fastening the flashing on the surface of these access points.
To create adequate flashing, you need to decide on the best locations. Detect areas where water may enter around your flat roof. Look for pipes that come out of the house, like chimneys. It would also be wise to check for any vents that exist.
After setting and covering the plywood with felt, the roof flashing is installed so it lies right underneath the shingles. You will have to install the flashing throughout the border to the roof to secure the shingles’ underside.
Add a note about inspecting the flashing periodically to prevent leaks. A small oversight during installation can lead to major water damage. Regular checks ensure that your flashing remains effective against the elements.
2. Sizing and cutting the flashing
After the flashing locations have been decided, you have to measure and trim the flashing. Set a piece of flashing on top of the area and mark the perimeter line of the area. Warp it around until the flashing reaches and partly covers the starting edge. Using a marker, create a line and cut the excessive area with aviation snips.
If you use aluminum flashing, wrapping it in this manner would be effortless. You don’t need to modify the brim of the flat roof, but you must make sure that each placed part is slightly overlapping.
My experience has shown that ensuring slight overlaps between flashing pieces is essential. This overlap acts as an additional barrier against water, ensuring that no moisture can slip through the joints.
Cut the flash using aviation snips once every 2” on one wrapped side for flashing in the pipe area. Then bend it throughout the location and cut the excess.
3. Set the flashing
Once the flashing for your flat roof has been determined the locations and trimmed according to the correct size, the installation part comes easily. Locate the flashing where it is supposed to be, then set it to using a hammer and roofing nails.
Use high-performance roofing epoxy after the flashing is secured correctly by the nails. Apply the epoxy as if you’re painting all over the roof flashing. The epoxy will serve as a sealant for the flashing sides and prevent leaking.
I often add a drip edge in my installations. This not only secures the flashing but also directs water away from the roof’s edges, preventing pooling and potential leaks. The combination of flashing and drip edge creates a comprehensive water barrier.
| Component | Importance | Personal Insight |
|---|---|---|
| Drip Edge | Prevents water from seeping into the roof structure and directs water away from the roof. | A well-installed drip edge has prevented several costly repairs in my experience, especially in climates with heavy rainfall. |
| Flashing Overlap | Ensures no water can penetrate through joints. | Overlapping flashing pieces is a simple yet crucial step that reinforces the roof’s waterproofing, something I always emphasize during installations. |
| High-Performance Epoxy | Seals and protects the flashing from water intrusion. | The use of high-performance epoxy has proven to be highly effective in sealing and extending the lifespan of flashing, ensuring long-term durability. |
| Regular Inspection | Identifies potential issues before they become significant. | Regular inspections have allowed me to catch minor issues early, saving homeowners from expensive repairs due to unnoticed water damage. |
| Professional Installation | Guarantees adherence to safety and building codes. | Engaging a professional ensures that all elements, including drip edges and flashing, are correctly installed, offering peace of mind and long-term protection. |
Flat roof edge flashing installation is a project best left to professional roofers who know safety requirements, best practices, and the applicable building laws and codes in your area.
Note that the guidelines above are provided merely to help you understand the basic steps to expect from the professionals you hire. As an experienced roofer, I can attest that DIY projects can sometimes lead to oversights that professionals would typically catch, especially regarding flashing and drip edges.
