Ventilating Firestop with Segmented Intumescent Shield
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Solution Overview
Problem
Existing intumescent-based passive vents fail to effectively stop fires within the required time, especially when construction parts bend or move during a fire, and they require accurate fitting and straight contact surfaces, limiting their flexibility and efficiency.
Innovation Solution
A ventilating firestop comprising a self-supporting mesh with a semi-open intumescent pattern that forms a shell quickly in fire heat, allowing for rapid expansion and formation of a fire-insulating shield, while additional intumescent material fills the volume for extended fire resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard intumescent vents are used to stop fire within 5 minutes, then fire stopping performance is achieved, but the vents require thick layers that take a long time to close gaps and require accurate fitting with straight contact surfaces
Solution Approach 1:
The intumescent material is segmented into two distinct functional zones: a shell-forming intumescent layer positioned at the fire-exposed surface that rapidly expands to form a protective shell within seconds, and a volume-filling intumescent material in the interior that expands more slowly to fill remaining gaps. This segmentation allows the firestop to achieve both rapid initial protection and complete gap closure, resolving the contradiction between fast response time and complete fire stopping performance.
Solution Approach 2:
The shell-forming intumescent is positioned in advance at the fire-exposed surface, ready to immediately form a protective barrier upon heat exposure. This preliminary positioning ensures that the first heat stress is absorbed by the shell formation rather than being lost to interior intumescent material, achieving rapid fire stopping performance within seconds of fire exposure without requiring thick overall layers or accurate fitting.
2Ease of manufacture
If ordinary intumescent-based vents are used, then simple and effective firestop is achieved, but they fail when cladding or construction parts bend or are consumed in fire creating openings for fire spread
Solution Approach 1:
The firestop system transitions from a static configuration to a dynamic adaptive structure. The self-supporting mesh provides initial structural integrity, but the intumescent material dynamically responds to heat by expanding and adapting its volume. The shell-forming intumescent creates a rigid protective barrier, while the volume-filling intumescent continuously adapts to fill gaps created by thermal expansion of surrounding construction parts, maintaining firestop performance even when cladding bends or moves during fire.
Solution Approach 2:
The system utilizes parameter changes in the intumescent material properties in response to temperature. As temperature increases, the intumescent material undergoes chemical transformation and volumetric expansion. The shell-forming intumescent changes from a thin coating to a thick protective shell, while the volume-filling intumescent expands to occupy available space, automatically adapting to construction movement and maintaining fire resistance without requiring pre-adjustment for thermal effects.
3Reliability
If intumescent material is positioned close to the shell, then volume filling is achieved, but heat transfer is lost to the interior intumescent delaying shell formation
Solution Approach 1:
Different regions of the firestop assembly are assigned different qualities and functions. The shell-forming intumescent has properties optimized for rapid expansion and shell formation (positioned at the fire-exposed surface), while the volume-filling intumescent has properties optimized for sustained expansion and gap filling (positioned in the interior). This local differentiation ensures that heat first activates the shell-forming material for immediate protection, while the interior volume-filling material activates subsequently to complete the fire barrier, eliminating heat waste and achieving both rapid shell formation and complete volume filling.
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 solution achieves full fire insulation within 5 seconds, significantly faster than conventional vents, and provides extended fire resistance by forming a rapid shell and filling the volume with intumescent material.
Implementation Method 1
Heat that finds its way to another intumescent at the same time and thereby reduces heat uptake in the shell will delay the formation of the shell
Implementation Method 2
When exposed to heat from a fire, the intumescent material expands and closes the vent
Data Source
AI summary
The invention relates to a ventilating firestop (10), comprising a load-bearing mesh (12) fitted with an intumescent (14), wherein the mesh (12) is malleable to a completely or partially confined volume (22), and the intumescent (14) applied to the mesh (12) forms a stripe pattern of intumescent spaced apart and with ventilating openings (30) between the stripes. At least the intumescent (14) in a plane which is exposed by fire forms a fine mesh and rapidly expandable stripe pattern which, during the fire attack phase, seals the openings (30) and forms a fire-insulating shield (40), and the intumescent (14) located separately from the shield (40), after formation of the shield (40), is expandable to subsequently fills up the remaining volume (22) in the firestop (10).