Why doesn't colored galvanized sheet rust? Expert review of lifespan and moisture resistance
One of the biggest concerns for employers, shed builders, and villa builders in humid areas like the north of the country is the erosion and rusting of metal roofs and structures. High humidity, constant rain, and the presence of salt in the air of the coastal areas of Mazandaran provide ideal conditions for rapid oxidation of metals. Choosing the wrong material can lead to heavy financial losses and the need to replace the roof covering early. In the meantime, colored galvanized sheet is known as an unrivaled champion and a definitive solution against moisture. But what really makes these sheets so resistant to oxidation and rust? Why do some sheets rust after a few years, while others last for decades? In this article, we will examine the secret to the long lifespan of these sheets and discuss the importance of the factory production process in their final quality.
Dual Defense Mechanism; The Secret to the Rust-Resistance of Colored Galvanized Sheet
The main reason for the stunning resistance of colored galvanized sheets is the use of a smart, two-layer protection system that prevents moisture and oxygen (the main factors of rust) from reaching the steel core of the sheet. This process consists of two main steps:
1. Galvanization process (protective zinc coating)
The basis of these sheets are oiled steel sheets (cold rolled). In the first step, these sheets are immersed in pools of molten zinc metal at very high temperatures. This metal layer is not just a simple coating; Rather, it acts chemically as a “sacrificial anode” or cathodic protection.
This means that even if the surface of the sheet is deeply scratched by impact and the underlying steel is exposed to air, the “zinc” metal reacts with oxygen and oxidizes instead of the steel. This chemical sacrifice prevents corrosion from progressing on the surface of the sheet. The thickness of this zinc layer (measured in grams per square meter or coating) plays a direct role in the life of the sheet.
2. Electrostatic and oven-baked paint coating (final protection and beauty)
The second layer of protection is electrostatic and oven-baked paint. In addition to beautifying the roof of the villa or shed, this colored layer (usually made of polyester) acts as an impenetrable barrier against acid rain, UV rays from the sun, scratches and extreme humidity. The engineered combination of these two layers increases the useful life of the sheet to more than 50 years.
The importance of layer thickness and production standards
Unfortunately, there are low-quality sheets on the market that only have the appearance of galvanized sheets. In a standard sheet, the thickness of the top coat layer is usually between 20 and 25 microns and the back coat between 7 and 15 microns. Any reduction in these thicknesses by unauthorized workshops greatly increases the sheet's vulnerability to moisture. This is why purchasing from a reputable industry reference such as Sabat Sanat guarantees receiving a product with real standards and engineered thicknesses.
Why is forming quality crucial in preventing rust?
Many people do not know that even if they purchase the best and most expensive colored galvanized sheet in the world, but form it with non-standard machines, the sheet will quickly be destroyed!
When a steel sheet enters a roll forming machine to be transformed into designs such as a sine (shutter), trapezoid or a tile design, it is subjected to great pressure and tension. The use of traditional, worn-out and workshop machines causes thermal stress, microscopic cracks and peeling of the paint and galvanized layer at the bending points. Moisture easily penetrates through these invisible cracks and rust begins precisely at the bending and cutting points.
This is where the difference between a fully industrial and engineered production and workshop methods becomes clear.
Unrivaled quality with Sabat Sanat’s integrated and industrial services
To have a safe, beautiful and long-lasting roof, it is not enough to just buy a quality sheet; the way it is shaped, cut, made of accessories and installed is also of great importance. At Sabat Sanat Company, we offer you a complete package of engineering services by eliminating intermediaries and focusing on industrial quality.
We are proud that all stages of painting, bending, precise cutting and final installation are carried out by Sabat Sanat Company's experts and advanced machines.
Advantages of using Sabat Sanat's integrated services:
- Cutting with advanced CNC machines: Precise cutting without creating pleats, burning edges and the slightest damage to the galvanized layer and paint.
- Standard forming: Implementation of various designs (sinusoidal, trapezoidal, Italian tile, etc.) without creating stress and cracks on the sheet surface.
- Specialized design of sealing accessories: Precise design and construction of flushing, paloni, eaves and facades in accordance with the architecture of the structure and the rainy northern climate, to prevent 100% water and wind penetration.
- Specialized installation: Precise implementation of the roof by Sabat Sanat's professional installation team with quality assurance, while observing the principles of insulation and correct overlap of the sheets.
Economic justification; cheap workshop sheet or Sabat Sanat standard quality?
At first glance, buying miscellaneous sheets from small workshops may seem a little cheaper. But one must pay attention to the “life cycle cost” approach. Poor-quality sheets in the humid environment of Mazandaran will rot, fade, and leak in less than 3 to 5 years. The costs of repairs, damage to the underlying insulation, damage to the facilities inside the building, and ultimately the need to replace the entire roof, will cost the employer tens of times the initial cost.
In contrast, investing in standard sheets produced and formed at Sabat Sanat Company will guarantee your peace of mind for decades to come. This feature has made them the most economical and logical choice for covering the roof of prefabricated villas, industrial structures, engineering cabins and sheds.
Conclusion; A safe investment for the roof of your structure
Buying colored galvanized sheet for roof covering is not a consumption expense, but a long-term investment to protect the entire structure, its equipment and its residents. To avoid exorbitant maintenance costs in the future, entrust the work to a reputable industrial reference and benefit from the difference in factory quality.
Insure your structure against nature with Sabat Sanat
Are you looking for a rust-proof, durable and modern-looking material to cover the roof of a shed, equip a workshop, build a food truck or your dream villa in the north of the country?
Contact Sabat Sanat's Sales Engineering Department now. Our experts are ready to provide you with free expert advice and up-to-date prices for all types of colored galvanized sheets (in various designs and thicknesses).
We recommend that you visit our industrial and well-equipped production line before making any decisions to see the difference between an engineering factory (with automatic equipment and overhead cranes) and traditional workshops. We will be with you as a technical and engineering partner from the moment you select the sheet to the last stage of installation.
For price inquiries, advice, and direct order placement from the factory, contact us:
09120047636
09020047636
