Chimney Flashing: Materials and Options

July 2, 2022

When it comes to maintaining your home’s chimney, proper installation of a chimney flashing is crucial. Flashing is essential since it prevents water damage from leaks and deterioration of the chimney structure. Without proper flashing, water can seep into your home, causing damage to your roof, ceiling, walls, and ultimately compromise the structural integrity of your house.

Chimney flashing is a sealant installed between the chimney and the roofline. It’s usually made up of multiple materials and layers to make it strong enough to survive the elements. Different materials are used for flashing, and the choice of material often depends on individual preferences, budget, and installing conditions. Chimney flashing is available in several materials like lead, aluminum, copper, stainless steel, and galvanized steel. In this article, we’ll take a look at the different materials used in chimney flashing and their benefits.

Galvanized Steel Flashing

Galvanized steel flashing is the most common material used for chimney flashing. It’s known for its durability and ability to last long under harsh weather conditions. Galvanized steel flashing is essentially steel roofing that has been coated with a protective layer of zinc, which protects the metal from rust and corrosion. The flashing is typically installed in sections, and each section overlaps the other, forming a barrier against water infiltration.

Aluminum Flashing

Aluminum flashing is another popular choice for chimney flashing. It’s lightweight, durable, and resistant to corrosion. Aluminum flashing is a bit more expensive than galvanized steel flashing, but it’s an excellent alternative if you live in humid or coastal areas, where moisture is a common problem. Since aluminum is a soft metal, it’s also easier to work with during installation.

Copper Flashing

Copper flashing has been Chimney flashing a popular choice for chimney flashing for centuries. It’s a premium material that offers an exceptional level of corrosion resistance and is long-lasting. Copper flashing has a unique aesthetic appeal, and as it ages, it develops a natural patina that enhances its appearance. While it’s one of the most expensive options on the market, copper flashing is an excellent long-term investment since it doesn’t need to be upkept as frequently as other materials.

Lead Flashing

Lead flashing has been used for chimney flashing for centuries due to its excellent malleability, which allows for molding to fit the most complicated sections. While it isn’t as durable as other materials, lead is still a popular choice for chimney flashing due to its cost-effectiveness and added chemical stability. With proper installation, lead flashing is known to last for up to 100 years. It’s also one of the easiest materials to install, making it a top choice for homeowners who want to save on their installation costs.

Stainless Steel Flashing

Stainless steel flashing is the most expensive material used for chimney flashing. It’s durable, corrosion-resistant, and remains strong under extreme weather conditions. Stainless steel has more aesthetic appeal due to its flexibility in design, which allows for the creation of unique roof styles. While it will cost more upfront, stainless steel is a great investment that can save you relevant costs in the long run.

Choosing the right material for your chimney flashing is essential to maintain your chimney and protect your home from water damage. Consider a professional opinion to help you select the right material, and to ensure the proper installation of your chimney flashing. Calling a professional ensures the quality of the installation, and will prevent future leaks or issues. With the right installation and material choice, your chimney can stay protected, functional, and last for many years.