Fire Retardant Coating for Combustible Foam Cladding
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Solution Overview
Problem
High-rise buildings with aluminum and combustible foam composite clad panels are prone to rapid fire spread due to ignition of combustible foam insulation, which can penetrate through windows or open joints, posing significant challenges in both exterior and interior fire containment.
Innovation Solution
The implementation of Firefree 88, a proprietary fire retardant and fire-resistant coating, applied to exterior and interior surfaces of combustible clad buildings, including terrace areas, ground levels, and interior walls and ceilings, using specialized contractors and materials like Hilti or 3M fire caulk and double-faced fire-resistant tape, to meet stringent ASTM and FM testing standards, preventing ignition and flame spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If combustible foam insulation is used in aluminum clad panels for exterior finishing, then the building's insulation performance is improved, but the fire spread risk increases rapidly
Solution Approach 1:
A non-combustible mineral wool insulation material is introduced as an intermediary between the aluminum clad panels to replace the combustible foam insulation. This intermediary material maintains the thermal insulation performance while preventing fire spread through the building envelope, thereby resolving the contradiction between insulation effectiveness and fire safety.
Solution Approach 2:
The chemical composition and physical properties of the insulation material are changed from combustible organic foam to non-combustible mineral wool. This parameter change fundamentally alters the fire behavior of the cladding system while preserving its insulating capabilities, addressing the fire spread risk without sacrificing thermal performance.
2Reliability
If fire retardant coating is applied to exterior cladding, then fire resistance is improved, but the building's exterior appearance may be altered
Solution Approach 1:
The fire protection function is extracted from the exterior visible surface and relocated to the interior or non-visible portions of the cladding system. By applying fire retardant treatments to the interior face or using inherently fire-resistant materials behind the aesthetic panels, the building maintains its desired exterior appearance while achieving the required fire resistance performance.
3Reliability
If major retrofitting is performed on existing buildings to improve fire protection, then fire safety is improved, but building operations are disrupted and occupants are displaced
Solution Approach 1:
The retrofit approach is made dynamic and adaptable by developing modular, phased implementation strategies. Fire protection measures are installed in sections rather than requiring complete building shutdown, allowing occupancy and operations to continue in non-work zones. This dynamic approach enables fire safety improvements while maintaining building productivity and minimizing disruption to occupants.
4Weight of moving object
If combustible foam insulation is sandwiched between thin-gauge aluminum panels, then the cladding's lightweight and aesthetic properties are improved, but the fire containment capability deteriorates
Solution Approach 1:
The cladding system is reconfigured as a composite structure with non-combustible mineral wool insulation layered between or behind aluminum panels. This composite material approach maintains the lightweight characteristic of the original thin-gauge aluminum construction while incorporating fire-resistant materials that provide containment capability, thereby resolving the contradiction between weight efficiency and fire containment strength.
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 solution effectively prevents fire spread by maintaining backside temperatures below 121°C, reducing the risk of flashover and metal stud failure, allowing for quick and cost-effective retrofitting without altering the building's appearance or disrupting operations, enabling effective fire extinguishment and minimizing damage.
Implementation Method 1
maintaining backside temperatures below 121°C
Implementation Method 2
fire-resistant coating... preventing ignition and flame spread
Data Source
AI summary
Buildings, particularly high-rise buildings, are retrofitted with a fire resistant liquid-applied material, preferably a material that intumesces with heat, where the exterior of the building is formed of metal clad combustible foam composite panels. Once the fire resistant coating has been applied, new thin panels matching the original fascia are installed outside the original composite panels, with space between, so that the appearance of the building is maintained.