Mineral Wool Fire Barrier in Rear-Ventilated Facades
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Solution Overview
Problem
Existing rear-ventilated building facades face challenges in achieving long-lasting fire protection due to the reliability and cost-effectiveness of current fire barriers, which often rely on fiber materials that degrade over time and require complex constructions.
Innovation Solution
A rear-ventilated building facade design where the fire barrier, made of mineral wool, extends over the entire depth of the rear ventilation gap and features uniformly distributed openings, ensuring ventilation while preventing fire spread, with a simple and cost-effective configuration that maintains stability and effectiveness over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire barriers are made from fiber materials that can close gaps in case of fire, then fire protection is improved, but the structure becomes complex and the materials degrade over time
Solution Approach 1:
The fire barrier is pre-positioned in the rear ventilation gap before fire occurs, eliminating the need for dynamic gap-closing mechanisms. The mineral wool panel is installed in advance at the correct location, ready to perform its fire-blocking function immediately when needed, without requiring complex activation systems or degradation-resistant prestress mechanisms.
Solution Approach 2:
The invention uses a simple, inexpensive mineral wool panel that can be replaced if necessary, rather than complex, expensive fiber materials with prestress mechanisms. The fire barrier is designed as a straightforward, maintainable component that prioritizes cost-effectiveness and simplicity over long-term indestructibility.
2Reliability
If fire barriers completely close the rear ventilation gap, then fire spread is prevented, but ventilation and moisture removal are blocked
Solution Approach 1:
The fire barrier incorporates local openings or perforations in specific areas, allowing ventilation and moisture removal to continue while maintaining fire protection. The mineral wool panel is designed with localized openings that permit air flow but are sufficient to block fire spread, creating different functional zones within the same component.
3Reliability
If steel plates are used as fire barriers with thickness ≥ 1 mm, then fire resistance is improved, but the cost and weight increase
Solution Approach 1:
The invention changes the material parameter from dense steel to lightweight mineral wool, achieving comparable fire resistance through different physical properties. The mineral wool panel achieves fire protection through its inherent fire-resistant characteristics and positioning, rather than relying on the mass and density of metal, significantly reducing weight while maintaining effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design provides reliable and long-lasting fire protection by ensuring the fire barrier is already in position to prevent flame spread, while allowing sufficient ventilation, and can be installed in a cost-effective manner, enhancing the fire resistance and service life of the facade.
Implementation Method 1
the rear ventilation gap is interrupted in the vertical direction by at least one fire barrier, which is configured as a mineral wool panel
Implementation Method 2
there is a space, in which moisture that may be present can be reliably removed, is present due to the rear ventilation gap
Data Source
Figure 1
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Figure 4
AI summary
The present invention pertains to a rear-ventilated building facade (1) with a load-bearing external wall (2), with an insulation layer (3) formed from insulation panels (31) and with a facade cladding (4), wherein the facade cladding (4) is installed by means of a load-bearing structure, forming a rear ventilation gap (5), at a spaced location from the insulation layer (3), and wherein the rear ventilation gap (5) is interrupted in the vertical direction by at least one fire barrier (6), which is configured as a mineral wool panel. It is characterized in that the at least one fire barrier (6) extends over the entire width of the rear ventilation gap (5), and that the at least one fire barrier (6) has at least one opening extending in the vertical direction in the area of the rear ventilation gap (5). The present invention further provides a process for manufacturing a rear-ventilated building facade (1). It is thus possible to perfect a rear-ventilated building facade of this class such that a lastingly reliable fire protection can be achieved with a cost-effective configuration.