Extruded Head Flashing with Modular End Caps for Custom Fit
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Solution Overview
Problem
Existing window and door flashing systems are inefficient in directing moisture away from structures, particularly in accommodating various sizes and shapes, and are costly to manufacture and install due to the need for multiple prefabricated sizes.
Innovation Solution
A head flashing system comprising a center section and end caps, made through extrusion and injection molding, which can be cut to desired lengths and materials, including rigid and flexible plastics, to provide directional drainage and prevent water intrusion, suitable for use with windows and doors of any length, height, or shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple prefabricated sizes of flashing are stocked to accommodate various window and door dimensions, then adaptability to different construction needs is improved, but inventory complexity and storage costs increase
Solution Approach 1:
The flashing system uses a universal base unit with standardized dimensions that can accommodate multiple window and door sizes through adjustable end caps and field cutting, eliminating the need to stock multiple pre-fabricated sizes while maintaining adaptability to different construction needs
Solution Approach 2:
The flashing is divided into a base unit and separate end caps that can be configured in different combinations, allowing the same base component to serve multiple size requirements through modular assembly rather than requiring complete pre-fabricated units in various sizes
2Manufacturing precision
If injection molding tools are used for each size of flashing, then manufacturing precision is improved, but tooling costs and minimum order volumes increase
Solution Approach 1:
A single injection molding tool produces a universal base unit that serves all flashing size requirements, eliminating the need for separate tools for each size while maintaining consistent manufacturing precision across all applications
Solution Approach 2:
The system achieves size variation through field cutting and modular end cap assembly rather than through tooling changes, allowing the same molded base to be adapted to different dimensions through simple mechanical modifications rather than requiring new injection molds
3Productivity
If head flashing is manufactured by extrusion in long lengths, then manufacturing efficiency and economy are improved, but the ability to accommodate specific field dimensions requires additional field cutting and assembly
Solution Approach 1:
The extruded flashing is segmented into a base unit and end caps that can be assembled in the field, allowing efficient long-length extrusion manufacturing while providing modular components that are easy to install and adjust to specific dimensions
Solution Approach 2:
The base unit is pre-manufactured in efficient long extrusions, and the system includes pre-designed end caps and connection features that simplify field assembly, so that the preliminary manufacturing efficiency translates directly to ease of installation rather than requiring complex field fabrication
Data Source
AI summary
A window and door head flashing assembly is fabricated at a construction site to fit specific door or window widths. A center section which may be extruded with a sloped base, a rear flange, and a front lip. End caps may be provided to snap or glue on the center section. The end caps have a perpendicular fin which serves as an end dam to block the lateral movement of water. The assembly may be inverted for use as a sill pan. The center section may be cut to a desired length and installed over arched windows or doors by bending to shape as it is installed. For arched applications, a combination of rigid and flexible PVC may be coextruded to provide a desired cross sectional profile that is flexible enough to be bent around the arch, but stiff enough to retain its cross section for drainage.