If you’re looking to install a new metal roof, you’ve come to the right place. Today we’re going to compare two different types of metal roofing: Galvalume and galvanized. We’ll help you decide which is best for your home and why!

What is the difference between galvalume and galvanized metal roofing?

Galvalume and galvanized metal roofing are two popular options for roofing materials with some key differences.

Galvanized roofing is made from steel coated with zinc, while Galvalume roofing has a coating of zinc and aluminum.

Galvalume generally offers better corrosion resistance due to the addition of aluminum, making it more resistant to rust and corrosion in harsh environments.

Galvanized roofing has a distinctive silver-gray appearance, while Galvalume roofing has a bluish tint.

Galvalume also tends to have a longer lifespan and is slightly more expensive than galvanized roofing.

Factors to consider when choosing between the two include climate, aesthetics, budget, and desired lifespan.

Comparing the benefits of galvalume vs galvanized metal roofing

When comparing the benefits of galvalume and galvanized metal roofing, several factors come into play.

Galvanized metal roofing is coated with zinc, providing protection against corrosion and extending its lifespan.

However, galvalume metal roofing takes it a step further by combining zinc and aluminum in its coating, offering enhanced corrosion resistance and durability.

Galvalume roofing tends to outperform galvanized roofing in harsh environments, as the aluminum component provides added protection against rust and corrosion.

Also, galvalume roofing has a distinct bluish tint, while galvanized roofing displays a silver-gray appearance.

In terms of longevity, galvalume roofing generally has a longer lifespan due to its superior resistance to rust.

It is worth noting that galvalume metal roofing is typically slightly more expensive than galvanized roofing, but the added benefits may justify the cost for those seeking long-term durability.

Ultimately, factors such as climate, aesthetic preferences, budget, and desired lifespan should be considered when deciding between galvalume and galvanized metal roofing.

How well does galvalume vs. galvanized roofing provide corrosion resistance?

Galvalume and galvanized roofing offer different levels of corrosion resistance. Galvanized roofing, which is coated with zinc, provides good corrosion resistance and can withstand the elements reasonably well.

The zinc coating acts as a sacrificial barrier, protecting the underlying steel from rust and corrosion.

On the other hand, galvalume roofing offers superior corrosion resistance compared to galvanized roofing.

It has a coating that combines zinc and aluminum, which provides enhanced protection against rust and corrosion.

The addition of aluminum increases the durability and longevity of the roofing material, making it more resistant to corrosive elements, including saltwater and acidic environments.

While galvalume provides better corrosion resistance overall, it’s important to note that no roofing material is entirely immune to corrosion.

Environmental factors, such as the climate, air quality, and exposure to chemicals, can influence the performance of both galvalume and galvanized roofing.

Regular maintenance and upkeep, such as cleaning and inspecting the roof, can help prolong the lifespan and maintain the corrosion resistance of either type of roofing material.

What is the lifespan of a galvalume vs. galvanized metal roof?

The lifespan of a galvalume or galvanized metal roof can vary depending on several factors, including the quality of the material, the climate, maintenance practices, and exposure to corrosive elements.

Generally speaking, galvalume roofing tends to have a longer lifespan compared to galvanized roofing.

Galvanized metal roofs can typically last between 20 to 40 years, depending on the conditions. With proper maintenance and regular inspections, they can reach the higher end of that range.

However, in more corrosive environments or areas with high humidity or exposure to saltwater, galvanized roofs may have a shorter lifespan due to accelerated corrosion.

Galvalume metal roofs, thanks to their combination of zinc and aluminum coating, offer increased durability and corrosion resistance. They generally have a lifespan of 30 to 50 years or more.

Galvalume roofs tend to perform better in harsh environments, such as coastal areas with saltwater exposure or regions with high levels of industrial pollution.

It’s important to note that these lifespan estimates are general guidelines, and individual experiences may vary.

Regular maintenance, prompt repairs of any damages, and proper installation by qualified professionals can help maximize the lifespan of both galvalume and galvanized metal roofs.

How does the coating process of galvalume and galvanized metal roofing work?

The coating processes for galvalume and galvanized metal roofing involve applying protective layers to the steel substrate. Here’s a breakdown of each process:

Galvanized metal roofing

• Surface preparation: The steel substrate is cleaned and prepared to ensure proper adhesion of the coating. This may involve removing any dirt, oil, or mill scale from the surface.
• Hot-dip galvanizing: The steel is immersed in a bath of molten zinc at a temperature of around 850°F (450°C). This process is called hot-dip galvanizing. The zinc reacts with the steel to form a metallurgical bond, creating a protective layer on the surface.
• Cooling and solidification: After immersion, the coated steel is lifted out of the zinc bath and allowed to cool and solidify. As it cools, the zinc forms a durable, corrosion-resistant coating on the steel.

Galvalume metal roofing

• Surface preparation: Similar to galvanized roofing, the steel substrate is cleaned and prepared to ensure proper coating adhesion.
• Hot-dip coating: The prepared steel is passed through a bath of molten zinc at a temperature of around 850°F (450°C), just like in galvanized roofing. However, in the case of galvalume, it is followed by a second bath of molten aluminum, typically at a lower temperature.
• Alloy formation: The aluminum and zinc on the surface of the steel react to form a thin layer of an aluminum-zinc alloy. This alloy layer provides enhanced corrosion resistance due to the self-healing properties of aluminum, protecting the steel substrate.
• Cooling and solidification: After the coating process, the steel with the galvalume coating is cooled and solidified, resulting in a roofing material with a dual-layer protective coating of zinc and aluminum alloy.

How to choose between galvalume and galvanized roofing for your home?

Choosing between galvalume and galvanized roofing for your home requires considering several factors. Here’s a guide to help you make an informed decision:

• Climate and environmental conditions: Consider the climate in your area. If you live in a region with high humidity, coastal areas with saltwater exposure, or areas with significant industrial pollution, galvalume roofing may be more suitable due to its superior corrosion resistance. Galvanized roofing can still perform well in milder climates.
• Longevity and durability: Determine how long you expect your roof to last. Galvalume roofing generally has a longer lifespan than galvanized roofing due to its enhanced resistance to rust and corrosion. If you desire a roofing material that can withstand the elements for a longer period with minimal maintenance, galvalume may be the better choice.
• Aesthetic preferences: Consider the appearance of the roofing materials. Galvanized roofing has a silver-gray appearance, while galvalume roofing has a bluish tint. Assess which color complements the overall look of your home and aligns with your aesthetic preferences.
• Budget considerations: Evaluate your budget for the roofing project. Galvanized roofing is generally more affordable compared to galvalume roofing. If cost is a significant factor, galvanized roofing may be a more economical option.
• Maintenance requirements: Determine the level of maintenance you are willing to commit to. Both galvalume and galvanized roofing require some maintenance, such as periodic cleaning and inspections. However, galvalume roofing may require less maintenance in terms of corrosion prevention due to its superior resistance.
• Consult with professionals: Seek advice from roofing professionals or suppliers who can provide insights based on your specific needs and the local conditions. They can offer recommendations and help you assess the suitability of each roofing material for your home.

What’s the cost differences of galvalume vs galvanized roofs?

The cost difference between galvalume and galvanized roofs can vary depending on factors such as location, supplier, and specific market conditions. Generally, galvalume and galvanized roofing materials themselves have similar costs.

Pricing for roofing materials can range anywhere from $5.00 to $15.00 per square foot, depending on various factors such as the geographical location, the complexity of the roofing project, and the supplier or manufacturer.

Using this range, a 2000 sq ft metal roof could cost between $10,000 and $30,000 or more, depending on factors such as the specific type of metal, additional features, labor costs, and the complexity of the installation.

It’s recommended to obtain quotes from multiple suppliers and compare the specific details and warranties provided with the roofing materials to make an informed decision about the cost and value.

How does the warranty on galvalume vs. galvanized metal roofing work?

The warranty for galvalume and galvanized metal roofing can vary depending on the manufacturer, specific product, and market conditions.

Warranties for both galvalume and galvanized metal roofing cover defects in materials and workmanship.

These warranties typically outline the conditions under which the manufacturer will repair or replace the roofing material if it fails due to manufacturing defects.

The length of the warranty can vary, but it’s not uncommon for metal roofing warranties to range from 20 to 40 years or more.

However, the actual duration can be influenced by factors such as the quality of the material, the type of coating used, and the specific warranty terms provided by the manufacturer.

How does galvalume vs galvanized roofing fare in coastal areas, hurricanes, and other extreme weather conditions?

Coastal areas

Galvalume roofing is highly recommended for coastal areas due to its superior corrosion resistance.

The combination of zinc and aluminum in the coating provides enhanced protection against saltwater exposure and high levels of humidity.

This makes galvalume roofing more resistant to the corrosive effects of coastal environments, reducing the risk of rust and degradation over time.

Galvanized roofing can still perform reasonably well in coastal areas but may have a shorter lifespan due to increased exposure to corrosive elements.

Hurricanes and extreme weather

Both galvalume and galvanized roofing can withstand moderate to severe weather conditions, including high winds and heavy rain.

However, galvalume roofing has been found to offer better resistance to impact and wind uplift compared to galvanized roofing.

The aluminum component in the galvalume coating provides added strength and durability, making it more resilient against strong winds and flying debris typically associated with hurricanes and severe storms.

Where is galvanized metal best used?

Galvanized metal roofing is best used in a variety of applications, including residential, commercial, and industrial buildings. Here are some instances where galvanized metal is commonly used:

• Residential roofing: Galvanized metal roofing can be an economical and practical choice for residential properties, particularly in areas with milder climates or lower corrosion risks.
• Agricultural buildings: Galvanized metal is often used for barns, sheds, and other agricultural structures due to its affordability and moderate corrosion resistance.
• Industrial and commercial buildings: Galvanized metal roofing is commonly used in industrial and commercial buildings where cost-effectiveness and moderate corrosion resistance are desired.
• Non-exposure applications: Galvanized metal is suitable for non-exposure applications, such as interior structures, ceiling panels, and wall cladding.

Where is galvalume metal best used?

Galvalume metal roofing is best used in environments where superior corrosion resistance and durability are required. Here are some instances where galvalume metal is commonly used:

• Coastal areas: Galvalume roofing is highly recommended for coastal areas due to its exceptional resistance to saltwater exposure and high humidity, reducing the risk of rust and corrosion.
• Harsh weather conditions: Galvalume metal performs well in areas prone to severe weather conditions, including hurricanes, heavy rain, and strong winds, due to its increased strength and impact resistance.
• Industrial facilities: Galvalume roofing is suitable for industrial facilities where resistance to corrosive elements, such as chemicals or pollutants, is crucial.
• Long-term durability: Galvalume roofing is a preferred choice when seeking a long-lasting roofing solution with minimal maintenance requirements.

What are the downsides of galvalume and galvanized roofing?

While galvalume and galvanized roofing offer many benefits, they also have some downsides to consider:

Galvalume roofing

• Initial cost: Galvalume roofing tends to have a higher initial cost compared to galvanized roofing due to the inclusion of aluminum in the coating. This higher upfront cost may not be suitable for those with budget constraints.
• Color variation: Galvalume roofing can have a bluish tint due to the aluminum content in the coating. Some homeowners may prefer a more traditional or neutral color, and the bluish hue of galvalume may not align with their aesthetic preferences.
• Scratching and marring: Galvalume roofing is susceptible to scratching and marring during installation, maintenance, or severe weather events. These scratches can expose the underlying steel, increasing the risk of corrosion if not addressed promptly.
• Potential dissimilar metal corrosion: Galvalume roofing can be susceptible to dissimilar metal corrosion if it comes into contact with certain materials, such as copper or lead. Proper installation techniques and measures should be taken to prevent this type of corrosion.

Galvanized roofing

• Limited corrosion resistance: While galvanized roofing offers decent corrosion resistance, it is not as durable as galvalume roofing in highly corrosive environments. Over time, the zinc coating may wear off, and the underlying steel can be exposed to rust and corrosion.
• Shorter lifespan: Galvanized roofing generally has a shorter lifespan compared to galvalume roofing. In harsh climates or areas with high levels of pollution or saltwater exposure, galvanized roofing may require more frequent maintenance and replacement.
• Aesthetic considerations: Galvanized roofing has a silver-gray appearance, which may not suit everyone’s aesthetic preferences. Some homeowners may prefer roofing materials with different colors or finishes.
• Environmental considerations: The galvanizing process involves the use of zinc, which can have environmental implications. The production and disposal of galvanized roofing materials can have an impact on the environment.

Are there any risks for animals with galvalume or galvanized roofing?

There can be risks for animals associated with galvalume and galvanized roofing

• Water runoff: Both galvalume and galvanized roofing materials can shed rainwater or snowmelt, which may contain traces of the metal coating or other substances. Animals, particularly small ones such as birds or rodents, may come into contact with the water runoff and potentially ingest or absorb these substances. Depending on the specific coating used, there can be a minimal risk of toxicity or adverse effects.
• Sharp edges or scratches: During installation or maintenance, sharp edges or scratches may be present on the surface of galvalume or galvanized roofing. Animals, especially wildlife or pets with access to the roof, could potentially get injured by stepping on or brushing against these rough areas.
• Dissimilar metal corrosion: Galvanized roofing, in particular, can be prone to dissimilar metal corrosion when it comes into contact with certain other metals. If animals chew or come into contact with these corroded areas, they may ingest small amounts of the corroded metal, which could pose health risks.

To mitigate these risks, it’s important to take appropriate precautions

• Provide alternative water sources: If animals rely on water runoff for drinking, consider providing them with alternative water sources, such as a bird bath or water dish, to minimize their exposure to water runoff from galvalume or galvanized roofing.
• Smooth edges and surfaces: Ensure that any sharp edges or scratches on the roof are smoothed or repaired to minimize the risk of injury to animals.
• Monitor and limit access: Control access to the roof to prevent wildlife or pets from coming into contact with the roofing material. This can be achieved through proper fencing, barriers, or secure enclosures.
• Regular maintenance: Conduct regular inspections and maintenance on the roofing to address any potential hazards or damage that could pose risks to animals.

Which of the two looks better, galvalume or galvanized?

Galvalume roofing

Galvalume roofing has a distinctive appearance due to the aluminum content in the coating. It typically has a silver-gray color with a slight bluish tint.

Some people find this color visually appealing and modern, especially when paired with contemporary architectural styles.

The metallic sheen of galvalume can add a sleek and industrial touch to a building’s exterior.

Galvanized roofing

Galvanized roofing has a more traditional look with a silver-gray color. It lacks the bluish tint present in galvalume roofing.

This classic appearance can complement various architectural styles, especially those with a rustic or traditional aesthetic.

Galvanized roofing tends to have a matte finish, which can provide a softer and less reflective appearance compared to the shiny surface of galvalume.

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