A roof may seem like a simple construction. But in reality, a modern roof is actually a complex system designed to protect your home from harsh weather at multiple points.
However, many homeowners and roofing contractors alike may not understand the details of how each part works. Flashing — the metal trim that prevents water from leaking through your roof joints — is one of the most important parts of this system. Roof flashing is typically installed around chimneys and vents, against sidewalls, under dormers, and in roof valleys (where two adjacent roof slopes meet).
Drip edge is a type of metal flashing installed on the edge of the roof that directs water away from the fascia and soffit. It sticks out past the roof edge and typically has a flange at the bottom where it sits against the fascia.
While drip edge is a crucial part of an effective roofing system, some homeowners may not have it and many roofers don’t install it properly.
So how do you know whether your home has a proper drip edge installed? In this guide, we’ll cover everything you need to know as a homeowner about drip edge flashing, including the different types, materials, and how it works to protect your home.
In basic terms, drip edge flashing sticks out past the fascia to allow water to drip into the gutter or directly off of the house. Without it, water would run back against the fascia or onto the wall.
In order to understand how a drip edge truly works, it’s important to learn a bit about roof structure and the relevant terminology.
While the drip edge is typically recognized as the horizontal flashing at the end of the eaves, it should also be connected to and installed along the rake edges. When water hits the rake edges, it will run down the metal toward the drip edge installed at the eaves.
For the most part, there are three main types of drip edge. While each one accomplishes the same purpose (to direct water away from the house), they may be used in slightly different ways.
The top part of a drip edge is typically fastened directly into the roof, while the lower flange fits snugly against the fascia without a fastener. When installed at the eaves, drip edge/gutter apron should be nailed (every 12 inches) directly into the plywood decking. When installed at the rake edges of the roof, drip edge should be installed over the underlayment. In either case, the top half of the drip edge should always be fastened underneath the shingles if at all possible.
To ensure proper water runoff, roofers need to make sure the drip edges at the eaves and the rake edges of the roof are connected. Most of the time, they will cut and bend a piece of the metal to fit snugly around the corner of the roof so it creates a solid seal between the two pieces. This is common with other types of roof flashing as well. It’s important to make sure the metal pieces overlap by at least one inch to prevent leaks.
Whether you’re installing drip edge on a new roof or an existing roof, there are several materials you can choose from:
While many local building codes now require a drip edge for proper roof installation, some older homes may not have had it installed in the first place. For many years, the roofing industry used outdated techniques that didn’t always protect homes most effectively. Now, due to multiple decades of innovation, drip edge is required by most building codes for good reason. Without a drip edge, your home is especially vulnerable to multiple types of damage.
On the other hand, having a well-installed drip edge on your roof can protect your home from harsh weather and deterioration for many years. If your home does not have a drip edge or functional equivalent, it’s important to hire a trusted roofing company to install the drip edge properly.
In the same way water runs down the edge of a glass, rain can also run over the surface of your shingles and back underneath them. Without a drip edge to block and redirect the water, rain will continuously run under your shingles and cover your plywood decking. Over time, this will rot the wood and may create mold issues, especially when there is no direct sunlight to dry it up after a storm. This will cause your roof to decay much faster than it should and often makes for a very expensive replacement project.
In the same way, a roof without a drip edge can allow water to run back against the fascia. Over time, this can deteriorate the support system of your roof and cause it to collapse. It may also cause water to leak into your walls and down into your foundation in such a way that you won’t notice the leak for a long time. Leaks like this can create mold issues in your walls, damage your electrical system, and erode the foundation of your home.
There are plenty of ways a drip edge can help protect your home from the elements:
While drip edge flashing is essential for most homes, some roof designs achieve the same function in other ways. For instance, if you have pre-bent aluminum fascia that is flush against your roof decking, you don’t need to install drip edge flashing, (according to most local building codes).
In other cases, you may have an older home with rake molding installed on the rake edges of your roof. Because many of these homes were built before industry standards were updated, many local building codes don’t require drip edge to be installed at the gable ends of these homes.
You can’t rely on shingles and gutters alone to protect your roof from harsh weather. In almost all cases, having a drip edge on your roof is essential to making sure your home is safe from leaks and water damage. That’s why high-quality roof installation is so important. You want to be sure that your roof is built up to code, so that water drains properly away from your home.
While many roofing contractors don’t take the time to learn proper roofing techniques, we know how important it is to install drip edge and flashing correctly the first time. At Baltic Roofing, we practice proper roofing techniques in our office so that every roofing project we do provides lasting protection you can trust.
Before we start the repair or replacement process, we always pull the right permits with the city, ensuring your new roof is built up to local building codes. Then, we’ll take a detailed look at your roof and only recommend the options we believe will add the most value to your home.
If you need help with a new roof installation or want to make sure you have a proper drip edge installed on your roof, contact us at Baltic Roofing for a roof inspection today.
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