Drywall Expansion Joint Sealing with Foam Profile and Thin Plate
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Solution Overview
Problem
Existing drywall expansion joint sealing solutions are often bulky and material-intensive, hindering movement and requiring large joint widths to achieve sufficient movement absorption, especially for fire protection.
Innovation Solution
A compact drywall design featuring a foam sealing profile and a thin protective plate that overlaps the sealing profile and planking, allowing for maximum movement absorption without restricting the paneling, and using a two-layer planking for enhanced fire protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing solutions are used for expansion joints, then fire protection requirements are met, but the sealing device becomes very voluminous and material-intensive
Solution Approach 1:
The sealing device is divided into distinct functional segments: a foam sealing profile for acoustic and smoke sealing, and a separate protective plate for fire protection. This segmentation allows each component to be optimized independently, reducing the overall volume while maintaining fire protection reliability.
Solution Approach 2:
The protective plate is designed with localized thickness variations, being thinnest (less than 80%, preferably less than 60%) at the front side where it overlaps the planking, while maintaining sufficient thickness for fire protection. This local quality optimization reduces material usage and device volume while preserving the required fire safety performance.
2Adaptability or versatility
If large joint widths are used to achieve sufficient movement absorption, then movement freedom is increased, but the sealing device becomes more voluminous
Solution Approach 1:
The foam sealing profile's compressibility parameter is optimized to enable sufficient movement absorption within a compact volume. By selecting foam with appropriate mechanical properties, the sealing device achieves the required movement freedom without increasing joint width or device volume.
Solution Approach 2:
The sealing profile is designed to dynamically adapt its compression state based on the expansion joint's movement. The foam material allows elastic deformation during movement cycles, providing movement absorption capability while maintaining a compact sealed state when stationary, thus reducing the required joint width.
3Loss of substance
If the protective plate is made thinner for material efficiency, then material usage is reduced, but fire protection capability may be compromised
Solution Approach 1:
The sealing device combines foam material for acoustic and smoke sealing with a protective plate made of fire-resistant material. This composite structure allows the protective plate to be thinner than traditional solid fire barriers, achieving material efficiency while maintaining fire protection through the synergistic combination of materials with complementary 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 solution provides a compact, material-efficient drywall with reliable acoustic, smoke, and fire-proof sealing, ensuring long-term integrity of the expansion joint while minimizing damage to the sealing profile through elastic deformation.
Implementation Method 1
the sealing profile is compressed by less than 70% for all intended movement absorption or joint widths of the movement joint. Since foams only have a limited compressibility, this ensures that the sealing profile is only deformed elastically and not plastically.
Data Source
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AI summary
A drywall partition (10) has a sheathing (16) and a sealing device (28) for sealing an expansion joint (20) between a perimeter side (22) of the sheathing (16) and an adjacent building component (18). The sealing device (28) comprises a sealing profile (30) made of foam and a protective plate (32) which is offset relative to the sheathing (16) such that the protective plate (32) overlaps the sealing profile (30) and the sheathing (16) at their ends. The protective plate (32) has a wall thickness (d) that is less than 80% of the total wall thickness (W) of the sheathing (16). Furthermore, a method for manufacturing such a drywall partition (10) is provided.