How to Install a Metal Roof?

With so many roofing options available today, building owners across Western Oregon frequently choose metal. Aside from being incredibly durable and visually striking, metal roofs offer excellent protection against the elements and can drastically reduce seasonal energy costs due to their reflective properties. At Armadas Exterior LLC, we handle comprehensive architectural installations across both of our primary service hubs—whether you need an expert roofing contractor in the Portland Metro area (including Damascus) or down at our southern location in Cottage Grove serving the entire Eugene and Springfield region.

Installing a metal roof is a premium investment that requires careful structural planning and precise execution to ensure optimal long-term performance. Below is our complete professional guide on how to install a metal roof on your residential or commercial building to give you decades of flawless protection from harsh outside elements.

A Detailed Guide: How to Install a Metal Roof

Can You Install a Metal Roof Yourself?

While a highly skilled DIYer can technically install basic metal roofing panels on a simple, low-slope structure, a complete residential metal roof installation is best left to licensed professionals. The process requires highly specialized safety gear, precise material shearing tools, and custom flashing details at high-risk valleys and transitions to guarantee a fully watertight, wind-resistant warranty window.

If you are currently evaluating a full exterior overhaul, it is helpful to weigh your material choices side-by-side. Check out our comprehensive guide on Metal vs Asphalt Roof: What’s the Difference? to compare long-term material assets, or review our tutorial on How to Shingle a Roof to understand how traditional steep-slope installations contrast with interlocking metal panels.

Knowing how to install a metal roof on a house involves several steps, each requiring careful attention for a secure installation job. Proper metal roof installation also guarantees a beautiful, long-lasting roof for your building. Below is a detailed guide on how to install a metal roof:

1. Evaluate Existing Roof and Permit Requirements

The first vital step is to inquire with your local authorities regarding building codes and regulations. Acquiring the necessary permits is important to remain compliant with the installation. Assess the condition of your current roof, checking whether the existing materials can remain or need to be removed before the new installation.

2. Gather Tools and Materials

Make sure you have the tools and materials readily available for a smooth installation process. You will need to have the following ready:

• Metal roofing panels
• Roofing screws
• Power drill
• Sturdy ladder
• Safety harnesses
• Tin snips
• Work gloves
• Underlayment materials
• Ridge caps

Having everything prepared prevents interruptions during the installation and ensures you are fully prepared for each roofing stage.

3. Safety Precautions

Safety is a top priority when installing a metal roof. Use personal protective equipment to protect yourself from possible injuries. It’s advisable to work with a partner for added safety and assistance. Also, double-check that your ladder and work surfaces are stable and secure. Avoid working in wet or windy conditions, as these can pose safety hazards and impede installation.

4. Prepare the Roof Surface

Begin by slowly removing old roofing materials if they are no longer useful for the new roof. This will expose the roof sheathing, which you should inspect for damage. Make any necessary repairs to create a solid and even base for your metal roof. Proper preparation of this surface is necessary for a stable and lasting installation.

5. Install the Underlayment

Lay down a roofing underlayment across the entire roof surface, starting from the eaves and moving upward. Overlap each layer by a few inches, and securely nail or staple them according to the roofing manufacturer’s instructions. This underlayment is a barrier from moisture, providing an extra layer of protection beneath the metal panels.

6. Install Metal Drip Edges

Attach metal drip edges along the eaves and the gable roof ends. These outer edges help direct water away from the roof decking and ensure a clean and transitional edge from the roof to the fascia. This protection maintains the underlying wood structure’s integrity.

7. Position and Attach the Metal Panels

Start installing the metal panels at the roof’s bottom corner. Align the first panel with the edge accurately. Secure each panel with roofing screws placed into the raised rib sections following spacing guidelines outlined by the manufacturer. It’s important to slightly overlap the panels to create a watertight seam that prevents leakage.

8. Cut and Fit Panels as Needed

Use tin snips or a metal shear to cut panels to fit around roof features like valleys and ridges. Measure and cut precisely to fit the panels snugly, which minimizes waste and provides a clean appearance.

9. Install Flashing Around Roof Penetrations

Apply flashing around roof penetrations like chimneys, vents, and skylights. Secure the flashing adequately with screws or sealant to prevent water from seeping in at these vulnerable points. Proper installation of flashing is critical for maintaining the roof’s waterproofing.

10. Install Ridge Caps

Place ridge caps along roof peaks and ridges. These caps should overlap the metal panels and be secured with screws at each rib mark. Correctly installing ridge caps can prevent water and debris intrusion into critical joints.

11. Perform Final Inspection and Cleanup

Finally, conduct a thorough roof inspection to find any loose screws, sharp edges, or panels that may need adjustment. Additionally, gutters and downspouts must be free of debris to maintain their function. Clean up the work site by collecting any leftover materials, enhancing the safety and tidiness of the area.

The Difference Between Installing Metal Roofs on Traditional and Mobile Homes

If you want to learn how to install a metal roof on a mobile home, note that they differ when installing on an average house. While the basic principles of installing on a mobile home are similar to a standard home, there are some key differences and considerations to be aware of:

• Structural Considerations. Mobile homes often have distinct structural supports than standard homes, affecting how you attach the roof. Mobile homes may need additional bracing or support to handle a metal roof’s weight and potential wind uplift.
• Roof Pitch. Mobile homes may have a lower roof pitch than traditional homes, which can impact water drainage and the type of metal roofing profile that can be used. Some metal roofing systems are better suited to low-pitch installations and may be necessary for effective water runoff.
• Roof Overhang. The overhang (eaves) in mobile homes may be limited, so the installation of metal roofs might need modifications in how the panels are cut and attached and how gutters are installed to manage water runoff effectively.
• Substrate Layering. With mobile homes, there may be the option to install metal roofing directly over existing roofing materials, such as shingles, more frequently than with standard homes. However, you must guarantee that this practice complies with local building codes and does not compromise the roof structure.
• Ventilation and Insulation. Mobile homes often face ventilation or insulation limitations, which can become worse when a new roofing system is added. As a result, it’s important to assess these systems during the roofing installation. Improving them can help maintain energy efficiency and prevent moisture issues.
• Permitting and Regulations. Mobile and standard homes are subject to local building codes within Portland, Oregon. However, mobile homes may have additional regulations or specific guidelines that must be met, especially within a community governed by a homeowner’s association.
• Installation Techniques. While the basic types of installation are similar—such as laying underlayment, securing panels, and installing flashing—the techniques used may need slight alterations based on the structural features of the mobile home.

Tips to Remember During a Metal Roof Installation Project

Now that you have the instructions on installing a metal roof, it’s vital to remember the tips mentioned below. These tips will help the installation process be smoother and prevent any complications from happening. 

Some installation tips to remember are:

• Safety First. Prioritize safety before the installation process. This includes wearing appropriate personal protective equipment such as gloves, goggles, and harnesses. Make sure your ladders are stable, and the work area is clear of debris. Working on the roof involves risks like slipping and falling, so take precautionary measures, especially when working at heights or on steep roofs.
• Check Local Building Codes. Familiarize yourself with and adhere to local building codes and regulations. These codes may dictate specific requirements for metal roofing installation, such as fastening patterns or underlayment standards. Compliance will guarantee safety and legality and secure warranties or insurance coverage.
• Proper Measurement and Material Selection. Accurate measurement is key to a successful installation. Measure the roof’s dimensions to determine how much material you will need. Also, the appropriate type and gauge of metal roofing should be chosen based on the climate and architectural style.
• Ensure Adequate Ventilation. Adequate ventilation is needed to maintain the roof’s energy efficiency and structural integrity. Improper ventilation can lead to moisture buildup, resulting in mold growth and damage. Install venting systems like ridge vents or attic fans to allow proper air circulation, which regulates temperature and extends the roof’s lifespan.
• Install Underlayment. Applying an underlayment beneath the metal panels adds an extra layer of protection against moisture infiltration and provides noise reduction during rainstorms. The underlayment also acts as a barrier against ice dams and wind-driven rain.
• Use the Correct Fasteners. Metal roofs require specific fasteners to accommodate metal panel expansion and contraction. Use the recommended screws and rubber washers, making sure they are properly sealed to prevent leaks. Proper placement is important, so follow manufacturer guidelines for optimal spacing and alignment.
• Seam and Flashing Installation. Pay careful attention to seams and flashing, as they prevent leaks. Seal seams and overlapping panels with high-quality waterproof sealants or tapes. Properly install flashings around chimneys, vents, and other protrusions by flashing over these areas to maintain a constant barrier against water penetration.
• Incorporate Thermal Expansion. Metal roofs are subject to thermal expansion and contraction due to temperature changes. Provide enough room for this movement to prevent warping or buckling. This may involve leaving slight gaps or using floating clips and fasteners as specified by the manufacturer.

Benefits of Metal Roofing Over Other Materials

Metal roofing stands out as a superior option as it offers a range of benefits, making it an appealing choice over traditional materials such as asphalt shingles or tiles. If you’re not convinced to install a metal roof on your building, here are several convincing reasons that may change your mind:

• Durability. Metal roofs are exceptionally durable and can withstand extreme weather conditions, including high winds, heavy rain, and hail. Unlike other materials, metal is resistant to cracking, shrinking, and eroding, which means it can last up to 50 years or more with proper maintenance.
• Energy Efficiency. Metal roofing can improve a building’s energy efficiency by reflecting solar radiant heat. This can reduce cooling costs during hot weather, making your building more energy-efficient and environmentally friendly.
• Low Maintenance. Once installed, metal roofs only need minimal maintenance compared to other roofing types. They are resistant to moss, mildew, and insect infestations, reducing the need for frequent repairs or cleaning.
• Lightweight. Compared to traditional roofing materials, metal is lightweight. This can simplify the engineering and construction of the roof structure and can also make it suitable for re-roofing projects over existing materials without extra structural support.
• Eco-Friendly. Metal roofing materials are often made from recycled content and are 100% recyclable at the end of their life. This makes them a practical choice for environmentally conscious homeowners and builders in Portland, OR.
• Fire Resistance. Metal roofs are non-combustible, offering excellent fire resistance. This can be a critical consideration for homes in areas susceptible to wildfires or lightning strikes.
• Variety of Styles and Colors. Metal roofing is available in different styles, colors, and finishes, allowing for versatile design options. Whether you prefer the look of shingles, tiles, or slate, there is likely a metal option that mimics traditional materials while providing the benefits of metal.
• Increased Property Value. The durability, longevity, and aesthetic appeal of metal roofs can improve a property’s value over time. Potential buyers may be willing to pay more for homes with metal roofing due to its long-term benefits.

Types of Metal Roofing Materials to Choose From

When choosing a specific type of metal roof for your building, you must know about the various types of metal roofing materials, as each comes with its own set of characteristics, benefits, and applications. 

Steel

Steel is one of the most common materials used in metal roofing due to its strength, versatility, and affordability. It’s typically coated with a layer of zinc (galvanized) or a mixture of zinc and aluminum (galvalume) to protect against rust and corrosion. Steel roofs can be manufactured in panels or shingles and come in an array of finishes and colors.

They are well-suited for residential and commercial applications and are known to withstand harsh weather conditions. The combination of durability and cost-effectiveness makes steel a popular choice for many.

Aluminum

Aluminum is favored for its resistance to rust and corrosion, making it an ideal choice for coastal areas exposed to salty air. Unlike steel, aluminum naturally resists corrosion without the need for additional coatings. It is lightweight yet strong, which makes installation easier and reduces stress on the building’s structure.

Moreover, aluminum roofs offer good energy efficiency by reflecting sunlight and reducing cooling costs. They are also highly recyclable if you want to reduce the waste.

Copper

Copper roofing is renowned for its longevity, aesthetic appeal, and distinct ability to patina over time. This natural patina provides a unique, ever-changing appearance that many homeowners and architects find attractive. Copper is extremely durable, capable of lasting over a century, and naturally resists corrosion.

It is softer and more malleable than other metals, allowing for custom designs. However, copper is also more expensive, which may limit its use to premium projects or accent features such as domes and spires.

Zinc

Zinc is valued for its longevity and self-healing properties. When scratched, a protective film known as patina forms, reducing the appearance of blemishes and helping the roof maintain its integrity over time. Zinc roofs are highly durable and can last 80 to 100 years.

They are also eco-friendly, as they are highly recyclable and contain a high percentage of recycled content. Zinc’s unique aesthetic appeal, along with its low-maintenance nature, makes it a popular option for modern architecture and buildings that emphasize sustainability.

Tin

Once a popular choice for barn roofs and rural buildings, “tin roofing” typically refers to steel or aluminum coated with tin. True tin roofs are rare today, but they offer good durability and weather resistance if used. However, they are less common due to the prevalence of more advanced technologies and materials. Historically, tin roofs were appreciated for their simplicity of installation and maintenance.

Stainless Steel

Stainless steel is a premium roofing material known for its strength, durability, and resistance to corrosion. Unlike regular steel, stainless steel does not rust, even in harsh environments. It offers a sleek and modern aesthetic that appeals to contemporary designs.

Though more expensive because of its high performance and long lifespan, stainless steel roofs are typically used in projects requiring superior resistance to harsh elements and a polished appearance.

What Is the Biggest Problem With Metal Roofs?

The biggest problem often associated with metal roofs is noise, particularly during rainstorms or hail. While metal roofs offer numerous benefits, such as durability, energy efficiency, and aesthetic appeal, the noise generated during precipitation can be problematic for some homeowners.

Metal roofs can be noisier than standard roofing materials like asphalt shingles. This is primarily due to the material’s high surface tension and lack of insulation, which allows sound to travel freely across the metal panels. However, installing enhancements like insulation or solid sheathing can greatly reduce the noise generated from the metal roof.

Need a Certified Local Contractor to Install Your Metal Roof? Contact Us Today!

If you don’t have the specialized equipment, time, or crew required to safely execute a complex metal roof installation yourself, you can always leave the heavy lifting to the pros at Armadas Exterior LLC. Our highly trained teams have successfully designed and installed multiple metal roofing configurations for custom projects throughout Western Oregon. We source only top-tier, commercial-grade metals and premium underlayments to optimize your roof’s structural integrity, absolute waterproofing, and long-term performance.

Whether you are looking to install a premium metal roof in the Portland metro area or need an experienced crew down out of our Cottage Grove hub to service your property in Eugene or Springfield, we have you covered.

Contact us today to schedule your professional on-site consultation, and let us provide you with the perfect, permanent roofing solution!