Flexible Control Joint With Intumescent Fire-Sealing Strips
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Solution Overview
Problem
Conventional control joints in wall assemblies are prone to cracking and do not effectively prevent the spread of fire and smoke, while also being susceptible to staining from finishing materials.
Innovation Solution
A control joint design featuring a fire-resistant material strip and a flexible joint configuration that includes a fire-resistant material strip on its legs, which expands to seal gaps and inhibit fire and smoke spread, while also preventing staining by using removable legs or tape to contain finishing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional control joints are used in wall assemblies, then the structure provides basic flexibility for drywall movement, but they fail to effectively prevent cracking and do not adequately address stress relief in large areas of drywall
Solution Approach 1:
The control joint is divided into multiple functional segments: flanges for attachment, flex portion for movement absorption, legs for additional flexibility, and integrated fire-resistant material strips. This segmentation allows each component to address specific functional requirements independently, improving crack prevention without creating an overly complex integrated system.
Solution Approach 2:
The control joint incorporates composite construction by integrating fire-resistant material strips (such as intumescent materials or foam) into the joint structure itself. This composite approach enhances both the mechanical performance for crack prevention and the fire resistance properties, addressing multiple functions simultaneously without requiring separate components.
2Reliability
If control joints are designed with basic flexibility for drywall movement, then installation is simple, but they lack adequate fire resistance and sound insulation capabilities
Solution Approach 1:
The invention merges multiple functions into a single control joint component: structural flexibility for movement, fire resistance through integrated strips, and sound insulation. By combining these functions into one element rather than requiring separate components, the manufacturing process remains relatively simple while achieving enhanced performance across multiple parameters.
Solution Approach 2:
Fire-resistant material strips are strategically positioned within the control joint structure at locations where fire protection is most needed. This localized application of special materials provides effective fire resistance without requiring the entire control joint to be made from complex or expensive fire-resistant materials, thus maintaining ease of manufacture.
3Reliability
If control joints use traditional materials like pure zinc alloy or PVC, then manufacturing is straightforward, but they provide insufficient fire resistance and sound insulation
Solution Approach 1:
The control joint employs composite materials by integrating fire-resistant strips (such as intumescent materials or foam) into the traditional control joint structure. These strips provide both fire resistance and sound insulation properties. The use of targeted material integration rather than bulk material replacement maintains reasonable material quantity while significantly enhancing protective properties.
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 design effectively prevents fire and smoke spread, reduces cracking in large wall areas, and maintains a clean finish by containing finishing materials away from the flexible joint.
Implementation Method 1
Flex portion (16) is configured to allow control joint (10) to flex in order to allow the wallboard panels (24, 26) to move relative to each other
Implementation Method 2
The proposed control joint effectively reduces cracking in drywall by allowing for movement and thermal expansion, while providing fire resistance and improved sound insulation through the use of intumescent materials
Implementation Method 3
The proposed control joint effectively reduces cracking in drywall by allowing for movement and thermal expansion, while providing fire resistance and improved sound insulation through the use of intumescent materials and foam
Implementation Method 4
A control joint design featuring a pair of flanges with a flex portion and legs, where the flanges are perforated for finishing material application and include fire-resistant material strips to enhance fire resistance and sound insulation, allowing for flexible installation between wallboard panels or studs to accommodate movement and thermal changes
Data Source
AI summary
One embodiment of a control joint includes a first flange, a second flange, a flex portion positioned between the first flange and the second flange, a first leg, and a first strip. The first leg extends from the first flange and includes an interior surface facing the flex portion. The first strip may be positioned on at least a portion of a surface of the first leg.