A conventional roofing system’s weak points are its joints and penetrations. Roof joints are the point where slopes and roofing panels meet while penetrations are a term used for anything that is installed by drilling a hole in your roof. Roofing contractors install flashing—thin strips of metal—over joints and penetrations to prevent rainwater from infiltrating the underlayers through any gaps.
The Problem With Flashing
Unfortunately, roof flashing is easily dislodged by high winds. Not to mention it tends to loosen over time, increasing the risk of roof leaks. Fortunately, you can reduce the risk of leaks by choosing the right kind of flashing and scheduling routine roof maintenance.
The Different Types of Flashing
While planning a roof replacement, it’d be a good idea to consider which flashing material is suited to your area’s climate. To help you decide, here’s a quick overview:
Sheet metal – Sheet metal is made from steel, zinc and aluminum alloys and is the most widely used material for flashing
Aluminum – Another popular option is aluminum flashing. Aluminum is durable and cost-effective but isn’t suited for all homes. For instance, contractors don’t recommend installing aluminum flashing on homes with concrete and fiber-cement siding because alkaline components in cement and fiber cement siding can degrade the aluminum. Copper-rich preservatives, which are used in certain kinds of lumber, can also corrode aluminum.
Lead – This type of flashing is normally used to cover gaps between chimneys and roofing panels.
Copper and lead-copper – Copper and lead-copper flashing are the most expensive option, but they’re also the most durable. Unlike aluminum, copper and lead-copper aren’t vulnerable to wood preservatives. Thanks to copper’s aesthetic appeal, this type of flashing is often used in historic homes. However, copper and lead-copper flashing aren’t without their disadvantages. For one thing, they’re harder to mold than the aforementioned three.
Having trouble choosing? Consult an experienced roofing contractor.
Barnett Roofing, a company with over two decades of experience, offers a wide range of exterior services, including roof repair and replacement services. To get a free estimate, call us at (865) 936-6959 or fill out this form. Talk to us today!