Siphoning Fenestration Drainage Channel Assembly
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Solution Overview
Problem
Existing fenestration assembly drainage systems fail to effectively remove moisture from the gap between the assembly and the rough opening, leading to water penetration and damage, as conventional sealing and flashing methods are either ineffective or exacerbate the issue by trapping water within the structure.
Innovation Solution
A drainage system with a moisture barrier and channel assembly that utilizes siphoning action to expel water from the gap, featuring a vertical moisture barrier with channels that direct water to a drainage area, optimized in size and configuration to create sufficient vacuum pressure for effective water removal without requiring substantial modifications to installation procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealants or caulking are used to prevent water intrusion, then water penetration is reduced, but the sealants separate from the fenestration assembly or wall due to climatic conditions, building movement, surface type, or chemical reactions
Solution Approach 1:
The patent extracts the water blocking function from sealants and relocates it to a drainage system. The channel assembly collects and removes water that penetrates through sealant joints, making the sealant's primary function sealing while the drainage system handles water removal, thus preventing sealant failure from water accumulation
Solution Approach 2:
The channel assembly acts as an intermediary between the sealed joint and the wall structure. It provides a dedicated pathway for water that breaches the sealant, preventing direct contact between water and the sealant-wall interface, thereby reducing the stress and chemical degradation that cause sealant separation
2Reliability
If flashing is installed to divert water, then water diversion is achieved, but flashing may hold water against the fenestration assembly, accelerating decay
Solution Approach 1:
Instead of using flashing to block and divert water away from the assembly (traditional approach), the patent inverts the approach by providing channels that actively collect and remove water that has already penetrated to the drainage plane. This prevents water from accumulating against the assembly while avoiding the trapping effect of traditional flashing
Solution Approach 2:
The channel assembly extracts water from the drainage plane and removes it through dedicated channels, preventing water from remaining in contact with the fenestration assembly and wall structure, thereby eliminating the decay-accelerating effect of water accumulation
3Reliability
If angled pan with ribs is installed to drain water, then water drainage is provided, but installation requires changes to fenestration assembly installation and finishing to accommodate vertical height
Solution Approach 1:
The drainage system is segmented into modular components: the channel assembly with integrated channels, the flashing tape, and the coordination with nailing fin positioning. This segmentation allows each component to be installed independently according to standard practices, avoiding the need for complex coordinated modifications to the fenestration assembly
Solution Approach 2:
The channel assembly serves multiple functions: it provides drainage pathways, integrates with the nailing fin system, and coordinates with standard flashing and weatherproofing layers. This multi-functionality allows the system to work within existing installation frameworks without requiring specialized modifications to the fenestration assembly or finishing procedures
4Stability of the object's composition
If gap between fenestration assembly and rough opening is reduced, then structural tightness is improved, but moisture penetration increases due to shifting or expansion/contraction of materials post-installation
Solution Approach 1:
The channel assembly provides continuous drainage capability throughout the service life of the building. Even as materials expand, contract, or shift, the channels remain open and functional, continuously removing water that penetrates through the joint, thereby maintaining moisture protection despite dimensional changes in the assembly or structure
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 system efficiently removes moisture from the gap between the fenestration assembly and the rough opening, preventing water damage and decay by utilizing the weight of water to create a siphoning effect, ensuring effective drainage without the need for angled pans or substantial installation modifications.
Implementation Method 1
A drainage system with a moisture barrier and channel assembly that utilizes siphoning action to expel water from the gap
Implementation Method 2
optimized in size and configuration to create sufficient vacuum pressure for effective water removal
Data Source
AI summary
A drainage system for a fenestration assembly is located in a rough opening of a structure. The drainage system includes a moisture barrier located between at least a bottom of the fenestration assembly and a bottom inner surface of the rough opening. The moisture barrier includes a vertical portion extending generally vertically downward below the rough opening on an external side of the structure. A channel assembly is located generally below the rough opening. The channel assembly includes at least one channel having a channel entrance proximate the bottom inner surface of the rough opening and a discharge opening direct toward a drainage area. The channel includes an effective cross-sectional area adapted to siphon water located on the moisture barrier to the drainage area.