Difference Between Galvanized Steel and Regular Steel Roofing Sheets

When it comes to selecting the right material for roofing, steel is one of the most common choices. Two of the most popular options for steel roofing are galvanized steel and regular steel. Although both offer robust protection and durability, they differ in important ways that can affect their performance, lifespan, and cost. In this blog post, we'll break down the key differences between galvanized steel and regular steel roofing sheets.

What is Galvanized Steel?

Galvanized steel refers to steel that has been coated with a layer of zinc to prevent corrosion. The process of galvanization involves dipping the steel into molten zinc, which forms a protective barrier over the surface of the metal. This added layer helps to shield the steel from the elements, making it more resistant to rust, moisture, and other environmental factors that can cause deterioration over time.

What is Regular Steel?

Regular steel, often referred to as carbon steel or plain steel, is simply steel without any protective coating. While steel itself is a durable material, it is prone to rusting when exposed to moisture, humidity, or other corrosive elements. Regular steel roofing sheets are therefore more vulnerable to damage over time if not properly maintained or treated.

Key Differences Between Galvanized Steel and Regular Steel Roofing Sheets

1. Corrosion Resistance

   • Galvanized Steel: The zinc coating on galvanized steel provides excellent protection against rust and corrosion. It acts as a sacrificial anode, meaning it corrodes before the underlying steel does, prolonging the lifespan of the material.
   • Regular Steel: Without a protective layer, regular steel is highly susceptible to rust and corrosion, especially in areas with high humidity or rainfall. This can significantly reduce the life of the roofing material.

2. Durability and Longevity

   • Galvanized Steel: Due to its corrosion-resistant properties, galvanized steel tends to last much longer than regular steel, with a lifespan of 40-70 years depending on environmental conditions and maintenance.
   • Regular Steel: Regular steel typically has a shorter lifespan, with the potential for rust and corrosion reducing its strength over time. If left untreated, it may only last 10-20 years before requiring replacement.

3. Cost

   • Galvanized Steel: The added process of galvanization increases the cost of galvanized steel compared to regular steel. However, its longevity and reduced maintenance requirements can make it a cost-effective option in the long run.
   • Regular Steel: Regular steel is typically less expensive than galvanized steel. However, its shorter lifespan and need for more frequent maintenance may make it more expensive over time.

4. Maintenance

   • Galvanized Steel: One of the key benefits of galvanized steel is its low maintenance requirements. The protective zinc layer prevents the need for frequent cleaning or coatings, making it ideal for areas with harsh weather conditions.
   • Regular Steel: Regular steel requires more maintenance to prevent rust and corrosion. This could involve applying protective coatings or painting the steel regularly to keep it in good condition.

5. Aesthetic Appeal

   • Galvanized Steel: Galvanized steel has a distinct shiny, metallic finish when freshly coated, but over time, it can develop a matte, weathered appearance. However, this may not appeal to those seeking a more uniform or polished look.
   • Regular Steel: Regular steel can be painted or coated with different finishes to enhance its appearance. While it may start with a more basic metallic appearance, it can be customized to suit aesthetic preferences.

Conclusion

In summary, galvanized steel and regular steel both offer benefits for roofing, but they come with different considerations. Galvanized steel excels in terms of corrosion resistance, durability, and low maintenance, making it a superior choice for regions prone to harsh weather conditions. On the other hand, regular steel can be more affordable upfront, but its need for more regular maintenance and shorter lifespan may result in higher costs over time.

When selecting roofing materials, it's important to weigh the factors of cost, longevity, and maintenance to determine which option is best suited to your needs.