Cruciform Cavity Wall Barrier Water Management
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Solution Overview
Problem
In buildings with cavity walls, existing methods fail to effectively prevent water and small pieces of mortar from mixing with insulating material during retrospective installation, leading to potential contamination and structural issues.
Innovation Solution
A cruciform-shaped fitting is installed within the cavity wall, featuring a V-shaped channel to collect and direct water away from the insulation, while allowing insulation material to fill the spaces between its limbs, and is supported by pins to prevent mortar from falling onto the insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cavity wall barrier is installed to prevent water and mortar from mixing with insulation material, then the insulation integrity is improved, but the device complexity increases
Solution Approach 1:
The barrier is segmented into multiple functional components: a V-shaped water collection channel at the top, cruciform cross-section limbs that create insulation spaces, and support pins for stabilization. This segmentation allows each component to perform its specific function while maintaining overall system reliability.
Solution Approach 2:
The cruciform fitting performs multiple functions simultaneously: it collects water through its V-shaped top channel, provides spaces for insulation material between its limbs, supports the insulation material, and prevents mortar from bridging across the cavity. This multi-functionality reduces the need for separate components.
2Reliability
If the cavity wall barrier is designed with water collection channels and support structures, then protection against water and mortar contamination is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The barrier can be manufactured as a flexible plastic sheet that is folded or formed into the cruciform shape with V-shaped channels. This approach simplifies manufacturing compared to rigid structured components, as the flexible material can be easily formed, folded, and installed in the cavity space.
Solution Approach 2:
The barrier design allows for flexibility in installation and configuration. The cruciform structure can be adapted to different cavity widths, and the flexible material enables easy adjustment during installation while maintaining the protective functions.
3Reliability
If the barrier structure is made complex with multiple limbs and channels, then the effectiveness in preventing water and mortar mixing with insulation is improved, but the device complexity increases
Solution Approach 1:
The water collection function and insulation support function are merged into a single cruciform structure. The V-shaped channel collects water while the limbs simultaneously create spaces for insulation material, combining multiple protective functions in one integrated component.
Solution Approach 2:
The barrier utilizes the third dimension within the cavity space by creating a cruciform structure that extends vertically and horizontally. The V-shaped channel is positioned at the top to collect water, while the limbs extend downward to create insulation spaces, effectively using vertical and horizontal dimensions to achieve multiple protective functions.
Data Source
AI summary
A fitting for a cavity wall within a building includes an elongate member adapted to be supported within the cavity wall. The fitting has two adjacent limbs formed with holes along its length, to allow insulation to pass into an interior of the fitting. Two adjacent limbs form a V-shape channel extending along the top of the fitting when installed, to collect and direct water to the ends of the fitting and out through the boundary wall of the cavity. The fitting has a cross-shaped cross-section, and can be placed in the cavity retrospectively. The cross-shape of the fitting is provided almost flat when dispensed from a reel and when entering the cavity, then springs into the cross-shaped cross-section when the elongate member is straightened in the cavity, to fit tightly within the cavity. The fitting can be inserted into the cavity wall from inside or outside the building.