Which is a better steel roofing, 150 GSM or 70 GSM?

When it comes to selecting the right material for your roof, steel roofing stands out for its durability, strength, and longevity. However, not all steel roofings is created equal. One of the key factors that differentiate steel roofings materials is the amount of galvanization, measured in grams per square meter (GSM). Specifically, 150 GSM and 70 GSM are two common options. Understanding the difference between these two can help you make an informed decision about which is better suited for your needs.

Understanding GSM in Steel Roofing

GSM, or grams per square meter, refers to the thickness of the zinc coating applied to the steel during the galvanization process. This coating is critical because it protects the steel from corrosion, rust, and other environmental factors. The higher the GSM, the thicker the zinc layer, and, generally, the more durable the steel roofing will be.

Comparing 150 GSM and 70 GSM Steel Roofing

To determine which is the better option, let’s break down the characteristics, benefits, and drawbacks of both 150 GSM and 70 GSM steel roofing.

1. Durability and Longevity

150 GSM Steel Roofings: With a higher zinc coating, 150 GSM steel roofing offers enhanced protection against corrosion and rust. This makes it more durable in harsh environmental conditions, such as areas with high humidity, saltwater exposure, or acid rain. The thicker zinc layer ensures that the steel roofing can withstand these elements for a longer period, potentially increasing the roof’s lifespan by several years.
70 GSM Steel Roofings: While 70 GSM steel roofing is also galvanized, the thinner zinc layer offers less protection against the elements. This means that in environments where moisture and corrosive elements are prevalent, 70 GSM roofing may corrode faster, reducing its overall lifespan. However, in more temperate or dry climates, this difference may be less noticeable, and 70 GSM could still provide adequate durability.

2. Cost Considerations

150 GSM Steel Roofings: The increased durability and longevity of 150 GSM steel roofing come with a higher price tag. The cost is directly related to the amount of zinc used in the galvanization process. While this may be a more expensive option upfront, the long-term benefits, such as reduced maintenance and longer roof life, often justify the additional expense.
70 GSM Steel Roofings: For those on a tighter budget, 70 GSM steel roofing presents a more affordable alternative. The lower cost is due to the reduced amount of zinc used in its production. While it may not offer the same level of protection as 150 GSM, it can still be a viable option in less demanding environments or for projects where cost is a primary concern.

3. Environmental and Climatic Suitability

150 GSM Steel Roofings: If you live in an area with extreme weather conditions, such as heavy rainfall, snow, or exposure to salty coastal air, 150 GSM steel roofings is likely the better choice. The thicker zinc coating will better protect the steel from moisture and other corrosive elements, ensuring that your roof remains intact and functional for many years.
70 GSM Steel Roofings: In contrast, 70 GSM steel roofings may be suitable for regions with milder climates where the risk of corrosion is lower. This option can still provide adequate protection in such environments, especially if additional protective measures, such as regular maintenance or coatings, are applied.

4. Maintenance Requirements

150 GSM Steel Roofings: Due to its higher resistance to corrosion, 150 GSM steel roofings typically requires less frequent maintenance. The thicker zinc layer acts as a more robust barrier against rust, meaning you won’t need to worry about frequent touch-ups or repairs. This can save you time and money in the long run.
70 GSM Steel Roofings: With a thinner zinc coating, 70 GSM steel roofings may require more regular maintenance to prevent corrosion and extend its lifespan. This might involve applying protective coatings or performing more frequent inspections and repairs, particularly in areas prone to moisture or pollutants.

5. Aesthetic Appeal and Coating Options

150 GSM Steel Roofings: The thicker zinc coating on 150 GSM steel roofings can provide a more uniform and visually appealing finish. Additionally, this type of roofing may be more compatible with various coating options, such as paint or other protective layers, which can enhance its appearance and further protect the steel.
70 GSM Steel Roofing: While 70 GSM steel roofings can also be coated or painted, the thinner zinc layer may result in a slightly less uniform finish. However, this may not be a significant concern for all homeowners, especially if the roof is not a prominent visual feature of the building.

Which is Better for Your Steel Roofing Needs?

The choice between 150 GSM and 70 GSM steel roofing ultimately depends on several factors, including your budget, climate, and how long you expect your roof to last.

Opt for 150 GSM Steel Roofings If:
- You live in an area with harsh weather conditions or high humidity.
- You want a roof that requires minimal maintenance over its lifetime.
- Longevity and durability are your top priorities, and you’re willing to invest more upfront for long-term benefits.
Consider 70 GSM Steel Roofings If:
- You are working with a tighter budget and need a cost-effective roofing solution.
- Your home is in a temperate climate with lower risks of corrosion.
- You’re okay with potentially higher maintenance needs and shorter lifespan.

Conclusion

Both 150 GSM and 70 GSM steel roofing have their merits, and the best choice depends on your specific circumstances. For those prioritizing durability and long-term performance, 150 GSM is likely the superior option. However, for more budget-conscious projects or those in less demanding environments, 70 GSM can still offer reliable protection and performance. Carefully weigh the pros and cons of each option, considering your local climate, maintenance capacity, and long-term roofing goals, to make the best decision for your home.