Rainscreen Cladding Fire Test Results

Building Research Institute Certifications (ITB)

The Instytut Techniki Budowlanej (ITB) uses modern research methodologies and specialist measurement equipment to conduct tests on construction products.
A certificate from the Building Research Institute is considered to be a mark of safety, reliability, and quality that provides reassurance of the product’s fitness-for-purpose.


Product Scope and Summary of the Certificate

The Certificate tests the AGS System’s ventilated facade solutions in the event of a fire in the Fire Research Laboratory of the Building Research Institute.

Key Factors Assessed

  • The support structure of the cladding—a fragment of the facade was exposed to heat using a gas-fired burner with intensity equal to that of an actual, regular fire to observe the fragments of panels that crack and fall off.
  • The integrity of the connection—apart from local deformations, the integrity of the cladding systems’ connection to the floor they were mounted on was assessed.
  • The possibility of safe evacuation—in the event of a fire was tested by assessing the fragments falling off facade cladding, which can create a hazard in the evacuation area.


  • AGS system substructure kept its integrity in the case of fire, allowing the rescue team to evacuate people within 120 minutes.
  • While the aluminium grids of AGS substructure systems may gradually melt down, the stainless steel reinforcement strips in L and T profile types were able to provide a durability of mounting of 120 minutes, allowing rescue teams to evacuate people safely.

Certification includes

  • Factors relating to compliance with Building Regulations
  • Factors relating to the fire resistance of AGS products
  • Comparison of different constructional solutions to identify the most reliable fire safety solution
  • Testing of facade cladding made of:
  • Sintered stone
  • Panelling made of composites and aluminium or steel sheets
  • Glass-reinforced concrete
  • Framed and frameless photovoltaic modules
  • Fibre-cement panels

Final Comments

  • This technical evaluation will be valid indefinitely, provided that no material or technical changes are made to the AGS substructure systems.
AGS SYSTEM: Rainscreen Cladding System

View of the test elements in the 1st minute of the test

AGS SYSTEM: Rainscreen Cladding System

View of the test elements in the 61st minute of the test


Product Scope and Summary of the Certificate

The certificate tests the corrosion resistance of the AGS System’s ventilated facade solutions in a category C5 corrosion environment in the laboratory.

Key factors assessed

  • The possible application of the ZM310 and ZM430 zinc-magnesium coatings as anti-corrosion protection in the AGS steel substructure
  • Evaluation of corrosion resistance of construction elements made of GD350 steel, coated with Magnelis® ZM430


  • Testing resistance to neutral salt spray showed that ZM430 zinc-magnesium coating can effectively protect red corrosion on sheet metal surfaces after 1500 hours of exposure
  • Testing resistance to humid atmosphere showed that it can protect corrosion on sheet metal surface even after 15 cycles of exposure.
  • The AGS steel substructure with ZM310 zinc-magnesium coating can be used in an environment of the C5 corrosion category.


A test was conducted by the Warsaw University of Technology to determine the heat conductivity coefficient for 2.5 mm-thick brackets made of GD 350 steel with Magnelis® ZM430 zinc coating, used in ventilated facades manufactured by AGS.

Key findings

Table: Summary of calculation results for average conductivity coefficient for a 2.5 mm thick bracket made of GD 350 steel, with Magnelis® ZM 430 zinc coating.

The numerical results conclude that AGS system successfully obtained brackets of low heat conductivity coefficient through the openwork profile structure that extends the heat path.

AGS Magnelis® Brackets And Rails

Our products use Magnelis® for unprecedented corrosion resistance—even in the most hostile environments.

What is Magnelis®?

  • It’s an exceptional metallic coating produced by preparing pre-galvanized steel in a molten bath of 93.5% zinc, 3.5% aluminium, and 3% magnesium. The alloy is applied by continuous hot dip galvanizing process.

    The zinc-metallic unique composition offers breakthrough in corrosion protection and cut-edge protection. It also permits conventional processing operations that are possible with hot dip galvanised steel, such as drawing, bending, profiling, stamping, clinching, etc.

    Magnelis® coated steel is available in a variety of steel grades (steels for deep drawing and cold forming applications, high strength low alloy steels, and structural steels) and coating masses.

    Its use is approved for civil construction by a number of national bodies:

    • France: ETPMETPM for Magnelis®® by CSTB
    • Germany: DIBtDIBt Z-30.11-51 for Magnelis®®
    • Sweden: Technical Approval no. SC0559-13 for Magnelis®®
rainscreen cladding materials

Benefits of Using Magnelis®

  • Some other features of Magnelis® that give our products a competitive edge:

    • Outstanding corrosion resistance

    Magnelis® can resist corrosion for a lot longer compared to standard galvanized products,. Its specific composition allows it provide more effective corrosion protection than coatings containing lower magnesium content.

    Moreover, Magnelis® forms a dense layer on highly deformed zones, giving them the same durable protection as flat surfaces.

    High corrosion resistance means that the product requires less metallic coating to ensure equivalent corrosion protection compared to standard hot dip galvanized steel. This also facilitates processing steps, such as welding.

    • Edge protection with self-healing effect

    Magnelis® forms very dense zinc-based protective film when exposed to the environment, protecting the surface from outside penetration. It provides protection even on the perforations and uncoated edges owing to its 3% magnesium content.

    The Magnelis® film gradually covers the red rust present on uncoated zones. In fact, it’s almost impossible for the environment to penetrate the Magnelis® film.

    • Outperforms galvanized steel in almost all types of environments.
      Outdoor tests of salt spray and cyclic corrosion have proven that the protection provided by Magnelis® against long-term corrosion is three times better than galvanized steel.
    • Magnelis® shortens the logistics chain owing to its simpler fabrication process
    • Magnelis®’ ability to protect deformed shapes gives manufacturers the freedom to optimise designs.
    • Magnelis® has lower friction coefficient than that of standard hot dip galvanized steel, which leads to reduced powdering in forming operations.
    • Significantly reduces maintenance costs
    • Wide feasibility range
    • Environmentally-friendly

Applications of Magnelis®