Metal roofing lifespan: Your questions answered

By ASC Building Products.  

Learn about the factors that impact the durability of metal roofing. 

Choosing the right roofing system is a big decision and can impact the long-term protection, value and appearance of a structure. Metal roofing continues to earn a strong reputation for its reliability and resilience against intense weather conditions, including protection from fire and hail damage. Unlike other roofing materials, metal roofing systems are designed to endure where others may falter far earlier.  

But exactly how long can one expect a metal roof to last? The answer depends on several factors, including installation methods, environmental events and ongoing maintenance. Here at ASC Building Products, we answer common questions about how each of these factors impact the performance and longevity of a metal roof. 

How long does a metal roof last? 

Metal roofs are built to last — and then some. With lifespans commonly exceeding 50 years, metal is a top-tier choice for those looking to invest in long-term performance. At ASC Building Products, we back our residential metal roofing with a limited lifetime warranty, reflecting our confidence in the durability of our products. 

Key factors that influence lifespan include: 

• Environment: Proximity to coastal salt spray or industrial pollutants can reduce longevity if not addressed. 
• Maintenance: Routine bi-yearly rinsing with fresh water (avoiding abrasive or chemical cleaners) helps prevent the buildup of debris and organic matter that can harm the painted surface. 
• Panel type: Standing seam roofing (like our Skyline Roofing®) conceals fasteners for better weather protection. Exposed fastener options (like our corrugated metal) may have a shorter lifespan due to fastener exposure but can last longer with regular inspection and maintenance. 
• Product DNA: The metallic coating and paint system act as the roof’s armor by protecting against corrosion and aging. This is why robust paint systems last for decades and offer long warranties for film integrity (preventing chipping, peeling and flaking) and color fade. Learn more about color and paint systems on our color page. 
• Installation: The quality of the installation will be a primary factor in determining the longevity of a metal roof. 

How does installation quality influence durability? 

Proper installation, following the manufacturer’s recommendations, is essential to the long-term durability of any metal roof. Mistakes, such as incorrect flashing or improper fastener use, can lead to leaks or premature wear. Standing seam systems, which require a solid deck and more complex installation, demand even greater precision. Using the right sealants, closures and installation sequence is critical to prevent water infiltration and environmental exposure. That’s why ASC Building Products recommends working with an experienced metal roofing specialist for the best results. 

How to install a metal roof? 

To support installers and DIYers and ensure best practices are followed, ASC Building Products offers Installation Resources that provide step-by-step guidance, from preparing the roof deck to applying sealants and trim correctly. These resources are available in downloadable guides and video formats. A printed version of the installation guides is also available by request through the Literature and Sample Request Form. 

The following ‘how to’ videos were designed to help make your project a success, providing clear instructions on how to install a metal roof. 

What’s the correct way to cut metal panels? 

While factory panels are pre-cut with precision, some field cutting may be necessary. If so, it should always be done using hand tools with a shearing action, such as aviation snips or sheet metal shears. Tools like circular or reciprocating saws that generate heat can damage the paint and lead to corrosion. Improper field cutting can result in swarf — tiny steel particles — that damage the roof’s finish. Learn more in our Field Cutting Technical Bulletin. 

Can you paint a metal roof? 

Yes — but we don’t recommend it. Our roof panels are factory-painted under controlled conditions, ensuring consistent performance and long-term protection. Field painting often lacks the precision necessary for a smooth, uniform finish, resulting in uneven surfaces and trapped debris that can lead to peeling, cracking or accelerated aging. 

While painting a metal roof in the field may not necessarily compromise the structural durability of the roof itself, it can impact the aesthetic appearance and long-term finish performance. Factory-applied coatings are still the best choice for maximizing both the beauty and lifespan of your metal roofing system. 

How do you maintain a metal roof? 

Metal roofs are low-maintenance but not maintenance-free. The best approach? A simple rinse with a hose or pressure sprayer is sufficient. This helps wash away salt, dirt and organic matter that can degrade the painted surface over time. For exposed fastener panels, inspecting fasteners periodically to check tightness and the condition of the washers will further extend the roof’s life. 

Can you install metal roofing over shingles? 

In some areas, yes. But ASC Building Products recommends removing shingles to ensure a flat and structurally sound substrate. This improves long-term performance and ensures a clean visual finish. It also allows inspection and repair of the underlying roof deck — another step that contributes to overall durability. 

Final thoughts: Metal roofing built to last 

Metal roofing is an excellent choice of material for a structure designed to last a lifetime. Several factors can impact this expected lifespan, including issues commonly raised by homeowners. Overall, quality installation and appropriate project planning will maximize the durability and longevity of a metal roofing solution. 

Start your durable metal roof project journey today by asking your questions of ASC Building Products or downloading the Metal Roof Buyers Guide. 

Original article and photos source: ASC Building Products