Given the climate, water damage is common in the US, and affects 1 in 60 insured homes annually.
Roof flashing is important to protect your home against water damage and, consequently, costly repairs. It works by redirecting water away from potentially vulnerable areas, such as roof valleys, chimneys, and skylights.
In this article, we will cover everything you need to know about roof flashing, from materials used to types involved, as well as a step-by-step installation process. Let’s get started!
What is Roof Flashing and Why Do You Need One?
Roof flashing is a thin material, typically made of metal. It directs water on the roof away from areas that are prone to leaks. The flashing acts as a shield, and is installed in places like valleys, edges, areas around chimneys, vents, and skylights.
Even the best-installed shingles can leave small gaps through which water can seep. Flashing covers these gaps, guiding water safely off the roof.
Therefore, without proper flashing, you could face water damage and mold growth that can spread to the attic, insulation, and even interior walls, leading to expensive repairs.
What is Roof Flashing Made Of?
Roof flashing is typically made of any one of the following three materials:
Aluminum
Aluminum is a popular choice for roof flashing because it is lightweight and malleable. It is resistant to dust, which makes it low-maintenance and suitable for a lot of climates.
However, one thing to remember is that aluminum is highly likely to corrode when in contact with alkaline materials like concrete. A protective coating is therefore essential, especially in the coastal areas.
Copper
Copper is known for its durability and aesthetic look. Over time, copper develops a green patina, which adds a unique look to the roof.
On top of this, it is a relatively premium option in flashing, as it is extremely long-lasting, and can often even outlast shingles.
While it is more expensive, the initial investment can pay off in longevity and lower maintenance costs. In fact, in historic homes, copper is a common choice for roof flashing as it is the most reliable in maintaining structural integrity.
Steel
Galvanized steel is another common choice, known for its strength and resistance to wear. It is typically coated with zinc to prevent rusting, which makes it durable against the elements. Steel is heavier than aluminum, so it might require extra support during installation.
However, it is often the middle-ground choice in terms of cost and longevity, making it suitable for a wide range of projects.
Types of Roof Flashing
There are various types of roof flashing designed to serve specific purposes. Selecting the right type for your roof is crucial for effective water management. Here are the most common types:
Continuous Flashing
Also known as “apron flashing”, this is a single, long piece of metal that directs water away from a joint. It’s often installed where the roof meets a vertical surface like a wall. Continuous flashing is designed to direct water downward, keeping moisture away from sensitive areas.
Base
This two-part system is typically used around chimneys. It allows for movement as the roof expands and contracts with temperature changes, providing a more flexible seal against water infiltration. The first part is installed at the base, while the second overlaps it, ensuring water stays out.
Barge Flashing
Positioned along the edges of the roof, barge flashing serves both aesthetic and functional purposes. It covers and seals the joint between the roof and fascia, offering additional protection against wind-driven rain and giving a neat finish to the roofline.
Wall Flashing
Installed where a roof intersects with a vertical wall, wall flashing prevents water from seeping into the walls of a home. This type of flashing is crucial for areas like dormer windows, skylights, and rooftop patios, where the roof connects to a wall.
Valley Flashing
Placed in the valleys where two roof slopes meet, this type of flashing helps guide water into the gutter system. Since valleys often accumulate the most water flow during a storm, having proper valley flashing is critical to preventing leaks in these areas.
Ridge Flashing
Used along the ridge of the roof, ridge flashing covers the roof peak where two roof planes meet. It helps keep water out of the joint while allowing ventilation, reducing moisture buildup in the attic space.
Box Guttering
This type of flashing is used for directing water into gutters, often in low-slope or flat roofing situations. It is especially useful in areas with heavy rainfall, where effective drainage is essential to prevent water pooling.
How to Install Roof Flashing?
Roof flashing won’t work if it isn’t properly installed and adequately covering the shingles. Here are the steps to standard roof flashing installation:
Prepare the Area
Clean the installation area thoroughly. Remove any debris, nails, or old roofing materials. Ensure the surface is dry, as moisture can interfere with the adhesion of the flashing.
Measure and Cut the Flashing
Measure the length of the area that requires flashing, then use tin snips to cut the flashing material to size. When cutting, be sure to leave a few extra inches for overlap, which helps create a more secure seal.
Position the Flashing
Place the flashing against the area where water intrusion is likely, such as the base of a chimney or along a roof valley. Position it so that it overlaps with the shingles below to encourage proper water flow.
Secure the Flashing
Use roofing nails or screws to secure the flashing in place, spacing them evenly along the edges to ensure stability. Apply roofing sealant around the edges and over the nails to create a watertight barrier. Make sure to use a high-quality sealant that can withstand weather conditions in your area.
Install Shingles Over the Flashing
For most types of flashing, shingles should be installed over the top edge to blend the flashing with the roof. This not only enhances the look but also adds an additional layer of protection.
Check for Gaps and Seal
Inspect the flashing for any gaps or areas that may be loose. Apply additional sealant if needed to ensure a complete, waterproof installation. Be thorough during this step, as even small gaps can allow water to penetrate.
Test the Installation
After completing the installation, it’s a good idea to simulate rain by using a hose to ensure that water flows away as intended. This step helps identify any issues before the next storm hits.
Roof Flashing Installation Near Me
If you have been looking for “roof flashing installation near me”, this is where your search ends. Surf and Turf Roofing brings you a one-spot solution for roof-related problems.
We have a team that specializes in roof flashing installation to make sure your roof remains watertight and secure. Our experts are trained to handle various flashing types and materials, so whatever you want to go with, we’ve got you covered.
So why wait? Contact us today!
Frequently Asked Questions
How to install roof flashing tape?
Installing roof flashing tape is a straightforward process. Start by cleaning the area to ensure it is free from dust, debris, and moisture.
Cut the flashing tape to the required length, peel off the backing, and carefully press it into place. Be sure to smooth out any air bubbles or wrinkles for a tight seal. Flashing tape is ideal for small repairs or additional waterproofing around tricky areas like skylights and vents.
Does roof flashing go under or over shingles?
Roof flashing typically goes under the shingles at its base, particularly when installed along roof edges or valleys. This placement ensures that water flows over the flashing and is directed off the roof.
However, in some situations, such as step flashing along walls, the flashing is interwoven with the shingles. The important rule is to ensure water flows over the flashing rather than under it, keeping your roof protected from leaks.
