Prefabricated Wall Panel Drainage Channels
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Solution Overview
Problem
Existing prefabricated exterior wall panel systems lack efficient and aesthetically acceptable drainage features, as traditional methods like starter tracks and flashing are impractical due to moisture diversion issues and installation difficulties.
Innovation Solution
Incorporating a panel body with a frame, exterior layer, insulation layer, wedge with a sloped surface, and channels aligned with openings in the exterior layer, along with edge wraps and a water barrier layer, to create a drainage system that directs moisture out of the panel through weep holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional starter track or flashing is used for drainage, then moisture can be removed from the wall interior, but the installation becomes impractical due to handling difficulties and inadequate performance
Solution Approach 1:
The drainage feature is merged directly into the prefabricated wall panel by forming channels within the insulation layer itself, rather than using separate starter tracks or flashing components. This integration eliminates the need for separate drainage components and their associated installation complexities, while maintaining effective moisture removal through the panel's built-in channel system that directs water to weep holes.
Solution Approach 2:
The wall panel's own insulation layer serves the dual function of both insulation and drainage. The channels are formed directly within the insulation material, allowing the panel to drain moisture from its own interior without requiring external drainage components. The insulation layer essentially services its own drainage needs through the integrated channel system.
2Reliability
If starter track is used to direct moisture, then drainage function is provided, but moisture is directed into the joint between panels which creates new problems
Solution Approach 1:
The drainage function is extracted from the panel joints and relocated to the interior of each individual panel. By forming channels within the insulation layer of each panel and providing weep holes in the panel's exterior face, the system removes moisture directly from within each panel without requiring moisture to travel through or into the joints between panels. This extracts the drainage action from the problematic joint area.
Solution Approach 2:
Each panel is given its own independent drainage capability through locally-formed channels within its insulation layer. Rather than relying on a continuous drainage system through joints, each panel has its own localized drainage path from the interior insulation to the exterior weep holes, making the drainage function a local property of each panel rather than a system-wide joint-dependent feature.
3Reliability
If prefabricated panels are made without drainage features, then factory inspection can ensure panel integrity, but no efficient means exists to divert water from the drainage plane
Solution Approach 1:
The drainage channels are formed preliminarily within the insulation layer during the prefabrication process, before the panel is shipped to the construction site. The channels are created as integral features of the panel assembly, with the insulation layer itself being formed or modified to include the drainage pathways. This preliminary formation of drainage features allows the panels to maintain their integrity during manufacturing while already possessing the capability to divert water.
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 effectively removes moisture from the interior of the wall panel system, achieving high drainage efficiency with minimal water absorption and practical installation, as demonstrated by testing with drainage efficiencies of 98.6% and 99% in two embodiments.
Implementation Method 1
a wedge (360) disposed between the base (130) and the insulation layer (162), wherein the wedge (360) includes a sloped surface (352)
Implementation Method 2
The panel body also can include a first edge wrap (176) disposed between the insulation layer (162) and the first side edge (124) of the panel body, a second edge wrap (176) disposed between the insulation layer (162) and the second side edge (134) of the panel body
Data Source
AI summary
Prefabricated exterior wall panel systems that incorporate one or more drainage features are disclosed. The drainage feature can include a channel formed in the panel body in fluid communication with an interior portion of the panel body and an opening in the front face of the panel. The drainage feature also can include a wedge having a sloped surface thereon on which the channel can be aligned. The exterior wall panel systems having these drainage features can be used in the exterior cladding of buildings and other structures.