Interlocking Curtain Wall Insulation Fire Safety
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Solution Overview
Problem
Existing curtain wall insulation systems fail to effectively inhibit the spread of fire and hot gases through perimeter voids between floor slabs and exterior building structures, as they are not securely interlocked and can be compromised by thermal expansion and material weakening during fires.
Innovation Solution
An interlocking curtain wall insulation system is designed with a frame of transoms and mullions, using compression-fit insulation and hangers to securely position safing insulation between the floor slab and backer bar, ensuring the perimeter voids are sealed against flame and gas spread, with mullion covers protecting the structure from heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If perimeter voids are provided between floor slab and exterior walls to accommodate thermal expansion, then the building structure can be formed square and aesthetically pleasing, but fire and hot gases can spread between floors through these voids
Solution Approach 1:
The system divides the perimeter void into multiple segments by installing fire-blocking components at regular intervals along the curtain wall. Each fire block segments the continuous void pathway, preventing unimpeded fire spread while maintaining thermal expansion capability in each segment.
Solution Approach 2:
Fire-resistant insulation materials and fire blocks are introduced as intermediary elements between the floor slab and exterior curtain wall. These intermediaries fill the perimeter void and block fire propagation while allowing the structure to accommodate thermal expansion through controlled movement paths.
2Object-affected harmful factors
If fire insulation is positioned in the thermal expansion gap, then fire spread is inhibited, but the aluminum curtain wall structure can weaken or melt during fire allowing the insulation to fall from position
Solution Approach 1:
The system uses composite construction combining fire-resistant insulation materials with metal framing systems and fire-blocking components. This composite structure maintains integrity at high temperatures, preventing insulation collapse while providing effective fire retardance through material synergy.
Solution Approach 2:
The design incorporates fire-resistant support structures and anchoring mechanisms installed beforehand that cushion against the potential failure of aluminum components during fire. These pre-positioned elements ensure insulation remains in place even when the aluminum curtain wall weakens or melts.
3Object-affected harmful factors
If trough device filled with urea formaldehyde foam is used, then fire spread is partially inhibited, but air gaps form between trough and curtain wall allowing smoke and flames to rise
Solution Approach 1:
The system merges multiple fire-blocking components including insulation panels, fire blocks, and sealing elements into an integrated assembly that eliminates air gaps. This combined approach ensures continuous fire protection without the gaps that allow smoke and flame penetration.
Solution Approach 2:
The design applies different fire-blocking strategies at different locations within the perimeter void system. Fire blocks are positioned at critical junctions, insulation fills continuous voids, and sealing materials address gap-prone areas, creating locally optimized fire protection throughout the structure.
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
The interlocking system effectively prevents the spread of smoke, flames, and hot gases between floors, maintaining structural integrity by compressively fitting insulation components and using heat-resistant materials to withstand high temperatures, thus enhancing fire safety in building structures.
Implementation Method 1
an insulation having a safing insulation extending between a floor slab and the backer bar and compressively fit therein
Implementation Method 2
compressively fit therein
Implementation Method 3
using heat-resistant materials to withstand high temperatures
Data Source
AI summary
The interlocking curtain wall insulation system comprises a frame connected to a building structure having at least first and second parallel transoms, at least first and second parallel mullions, the at least first and second parallel transoms operably engaging the at least first and second parallel mullions. The device further comprises an insulation including a safing insulation extending between a floor slab and the backer bar and compressively fit therein, an upper curtain wall insulation depending from an upper insulation hanger and compressing the safing insulation, and a lower curtain wall insulation depending from a lower insulation hanger.