Multilayer Fire-Rated Joint Gasket for Dynamic Wall Deflection
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Solution Overview
Problem
Conventional methods for creating fire-rated head-of-wall joints in building structures are time-consuming and expensive, and they do not effectively prevent the passage of fire, heat, and smoke through dynamic joints between walls and ceilings, especially in multi-story buildings.
Innovation Solution
A fire-blocking gasket profile with multiple layers, including a vinyl material, a foil lining, and an intumescent material, is used to seal the head-of-wall joint, allowing for dynamic movement and providing effective fire, smoke, and sound insulation by expanding to fill the deflection gap during a fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mineral wool material is stuffed into the head-of-wall joint and elastomeric material is sprayed over it, then fire resistance is achieved, but the installation process becomes time-consuming and expensive
Solution Approach 1:
The fire-blocking gasket profile is pre-assembled with the intumescent material and foil lining attached during manufacturing, eliminating the need for on-site assembly of multiple components. This preliminary preparation significantly reduces installation time while maintaining fire resistance performance
Solution Approach 2:
The invention combines multiple fire protection functions into a single integrated gasket profile component that includes the vinyl profile, foil lining, and intumescent material as one unified assembly. This merging of components simplifies the installation process compared to the conventional separate mineral wool and elastomeric material application
2Adaptability or versatility
If the head-of-wall joint is designed to allow dynamic movement for deflection accommodation, then building stability is improved, but fire, heat, and smoke can more easily pass through the joint
Solution Approach 1:
The gasket profile is designed to be flexible and dynamic, allowing it to accommodate the relative movement between the wall and ceiling while maintaining the fire seal. The vinyl profile can deform elastically to follow the deflection gap opening and closing, ensuring continuous fire protection throughout the movement cycle
Solution Approach 2:
The intumescent material within the gasket profile expands when exposed to fire heat, increasing its volume to fill the deflection gap and create a tighter seal against fire, heat, and smoke. This thermal expansion mechanism allows the joint to maintain fire resistance even when in a dynamic, open position
3Reliability
If intumescent material is used to block fire and smoke, then fire resistance is improved, but the material must be precisely positioned to expand into the deflection gap at the correct time
Solution Approach 1:
The intumescent material is pre-positioned and secured to the vinyl profile during manufacturing, ensuring it will expand into the deflection gap at the correct time and location during a fire event. This preliminary positioning eliminates the need for complex on-site adjustment while maintaining precise fire blocking performance
Solution Approach 2:
The foil lining acts as an intermediary layer between the vinyl profile and the intumescent material, helping to contain and direct the expansion of the intumescent material into the deflection gap. This intermediary structure ensures precise positioning without requiring complex manufacturing tolerances
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 gasket profile effectively seals the head-of-wall joint, preventing the passage of smoke, heat, and noise, while being cost-effective and flexible enough to accommodate building movements, and it passes relevant fire rating tests.
Implementation Method 1
When temperatures rise (e.g., due to a fire), the intumescent material on the DDATM fire block product expands. This expansion creates a barrier which fills the deflection gap and inhibits or at least substantially prevents fire, heat and smoke from moving through the head-of-wall joint
Implementation Method 2
Intumescent materials work well for this purpose, because they swell and char when exposed to flames helping to create a barrier to the fire, heat, and/or smoke
Data Source
AI summary
A fire-rated component for a fire-rated joint, such as a head-of-wall assembly, includes an elongate body having at least a first layer, which can be in the form of a polymer profile. A second layer can be or include a foil lining and a third layer can be or include an intumescent material. The elongate body, such as the first layer, defines an air gap. The foil lining and/or the intumescent material can be positioned within the air gap. A planar lower portion of the first layer of the elongate body is positioned between a header track and a wallboard in the fire-rated joint. A non-planar upper portion of the first layer of the elongate body is positioned at least partially within a deflection gap of the wall assembly and sealingly engages the ceiling.