Fire Rated Paint for Structural Steel Protection as per National Building Code
Fire safety is a critical requirement in modern construction, especially when it comes to structural steel protection. As per the National Building Code (NBC), every structural steel member must be protected against fire to ensure building safety and structural stability during a fire incident.
Why Fire Protection for Structural Steel Is Mandatory
Structural steel, though strong and durable, is highly vulnerable to fire. When exposed to high temperatures, steel rapidly loses its strength. Studies show that structural steel loses more than 50% of its characteristic strength at around 550°C.
An ISO Cellulosic Fire Curve reaches temperatures of 700°C within the first 15 minutes of a fire. Without proper fire protection, steel structures can fail quickly, leading to catastrophic consequences.
Role of Fire Rated Paint in Steel Fire Protection
Fire rated (intumescent) paint plays a very important role in protecting structural steel against fire. It is one of the most effective and easiest applicable fire protection methods available today.
When exposed to heat, fire rated paint expands and forms an insulating char layer. This layer delays the rise in steel temperature, helping the structure maintain its load-bearing capacity for the required fire rating duration.
Importance of DFT (Dry Film Thickness) Calculation
Before applying fire rated paint on any structural steel member, it is extremely important to calculate the correct DFT (Dry Film Thickness). The DFT depends on the desired fire rating, such as 60 minutes, 90 minutes, or 120 minutes.
Incorrect DFT can result in inadequate fire protection and non-compliance with fire safety standards.
Understanding Hp/A Ratio in Fire Rated Paint Application
To calculate the required DFT, the Hp/A ratio must be determined first.
- Hp (Heated Perimeter): The perimeter of the steel section exposed to fire
- A (Cross-Sectional Area): The total cross-sectional area of the steel member
The Hp/A ratio indicates how quickly heat will penetrate the steel section during a fire.
Once calculated, this value is compared with the standard DFT charts provided by Promat, which specify the required paint thickness for the desired fire resistance duration.
Fire Rated Paint Application – A Highly Technical Process
Applying fire rated paint is not a simple painting job. It is a highly technical task that requires:
- Accurate Hp/A ratio calculation
- Correct DFT determination
- Skilled surface preparation
- Controlled and precise paint application
- Strict quality checks and compliance with standards
Technical Masters in Fire Rated Paint Application
Fire rated paint application demands expertise, experience, and technical accuracy. With in-depth knowledge of NBC guidelines, ISO fire curves, Hp/A calculations, and Promat DFT standards, we are technical masters in fire rated paint application for structural steel.
Our approach ensures maximum fire resistance, safety compliance, and long-term performance of steel structures.
Conclusion
Fire rated paint is an essential solution for structural steel fire protection, helping buildings withstand extreme fire conditions and comply with the National Building Code. Correct DFT calculation and professional application are key to achieving the desired fire rating.
If you are looking for expert fire rated paint application for structural steel, trust professionals who understand the science, standards, and safety behind it.
