Exterior Wall Drainage Channels for Concealed Moisture Removal
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Solution Overview
Problem
Existing exterior wall assemblies face issues with water and moisture accumulation between layers, leading to degradation of components, necessitating effective drainage solutions to manage moisture migration.
Innovation Solution
The introduction of exterior wall system assemblies with drainage features, including channels and drainage tubes that facilitate the migration of moisture from air cavities to the exterior face, utilizing angled chamfers and channels to direct water away from the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers are used in exterior wall assemblies to provide various performance characteristics, then the wall assembly performance is improved, but water and moisture accumulation between layers occurs leading to component degradation
Solution Approach 1:
The wall assembly is divided into multiple functional layers including sheathing, water-resistant barrier, air cavity, and drainage channels. Each layer performs a specific function in managing moisture while maintaining overall wall performance. The segmentation allows water to be directed to specific drainage points without compromising the insulating or structural functions of other layers.
Solution Approach 2:
A water-resistant barrier layer is introduced as an intermediary between the sheathing and insulation layers. This barrier prevents water penetration while allowing moisture vapor to escape, acting as a mediator that protects internal components from water damage while maintaining the multi-layer performance characteristics.
2Object-affected harmful factors
If drainage features are added to manage moisture migration, then moisture management is improved, but the complexity of the wall assembly increases
Solution Approach 1:
The drainage channels are integrated directly into the sheathing board structure, combining the structural function of the sheathing with the drainage function. This merging eliminates the need for separate drainage components, reducing overall assembly complexity while maintaining effective moisture management.
Solution Approach 2:
The drainage channels are formed as self-contained features within the sheathing boards, with water naturally flowing through gravity-driven channels to drainage points. The system uses the wall assembly's own structure to manage moisture without requiring external active drainage systems, simplifying the overall design.
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
Effectively manages moisture migration by providing a pathway for water to exit the assembly, preventing degradation and ensuring the integrity of the wall components.
Implementation Method 1
a channel formed in the insulation layer... wherein the channel comprises a first channel leg, a second channel leg, and a channel nadir disposed between the first channel leg and the second channel leg, wherein the first channel leg and the second channel leg are aligned superior to the channel nadir
Data Source
AI summary
Exterior wall system assemblies, exterior wall system component subassemblies, and exterior wall system components that incorporate drainage features are disclosed. The drainage features can include a channel or conduit assembly by which moisture that collects within concealed spaces of the respective exterior wall system assembly can migrate via gravity from the concealed spaces out through the exterior wall system assembly to the outside of the building.