L-Shaped Bracket Cladding System for Wood Frame Moisture Protection
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Solution Overview
Problem
Existing wood-framed doors and windows with aluminum cladding face issues with structural integrity and moisture resistance due to the use of thin rolled aluminum cladding, which can lead to delamination and rotting of the wood frame.
Innovation Solution
A low-profile removable cladding system using a self-supporting cladding member and a rigid L-shaped bracket, where tension is created by flexing the cladding member to secure it to the fenestration frame member, enhancing structural integrity and moisture resistance without relying on adhesive or button-style fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin rolled aluminum cladding is applied directly to the wood frame surface, then the cladding can be easily applied, but the structural integrity is significantly less and moisture resistance is poor
Solution Approach 1:
The cladding system is divided into separate components: a thin rolled aluminum cladding member and a rigid L-shaped bracket. The bracket is attached to the wood frame with fasteners, and the cladding member is then attached to the bracket. This segmentation allows each component to be optimized independently - the cladding remains thin and easy to apply, while the bracket provides the necessary structural support.
Solution Approach 2:
The rigid L-shaped bracket serves as an intermediary element between the thin rolled aluminum cladding and the wood frame. This intermediary provides the structural support that thin aluminum cannot provide on its own, while still allowing the cladding to maintain its thin, easy-to-apply characteristics. The bracket transfers loads from the cladding to the frame.
2Ease of manufacture
If thin rolled aluminum cladding is applied directly to the wood frame surface, then the cladding can be easily applied, but moisture resistance is poor leading to delamination and rotting
Solution Approach 1:
By separating the cladding member from the wood frame through an intermediate bracket, the system creates a gap that prevents direct moisture transfer. The bracket acts as a barrier that protects the wood frame from moisture that might accumulate behind the cladding, thereby preventing rotting and delamination while maintaining ease of application.
Solution Approach 2:
The L-shaped bracket serves as a protective intermediary that shields the wood frame from moisture. It creates a drainage plane and prevents capillary action that would otherwise allow moisture to reach and damage the wood, while still allowing the thin aluminum cladding to be easily applied to its outer surface.
3Strength
If Euro-style thick extruded aluminum cladding is used, then structural rigidity and moisture resistance are improved, but the profile becomes thicker and more complex
Solution Approach 1:
The system segments the structural support function from the cladding surface. Instead of making the cladding itself thick and complex to provide structural rigidity, the support function is assigned to a separate L-shaped bracket. This allows the cladding to remain thin and simple while the bracket provides the necessary rigidity with a straightforward L-shaped design.
Solution Approach 2:
The L-shaped bracket acts as an intermediary that provides structural rigidity without adding complexity to the cladding surface. It creates a simple, clean profile by keeping the structural elements behind the cladding plane, allowing the visible cladding to remain thin and aesthetically pleasing while still providing the required strength.
4Strength
If Euro-style button-style fasteners are used to secure cladding, then structural integrity is improved, but the cladding becomes difficult to remove and requires complex fastening mechanisms
Solution Approach 1:
The attachment system is segmented into two stages: the bracket is first attached to the frame with removable fasteners, then the cladding is attached to the bracket. This segmentation allows the cladding to be removed by simply detaching it from the bracket, without requiring complex button-style fasteners. The bracket remains securely attached to the frame, providing ongoing support.
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 provides comparable strength and thermal performance to thicker cladding systems, improves sightlines, and prevents bending or twisting of the cladding and frame members, while maintaining moisture resistance and structural integrity.
Implementation Method 1
They held a cladding member and a rigid L-shaped bracket onto a fenestration frame member by tension caused by flexing of the cladding member
Implementation Method 2
tension caused by flexing of the cladding member
Data Source
AI summary
A low-profile cladding system that can be readily applied to doors, windows, fixed light openings, or curtain walls where thermal performance is important. The cladding system utilizes a cladding member in combination with an L-shaped bracket to attach and secure the cladding member to a frame or sash. The cladding member is held to the frame or sash by tension or pressure between opposite ends of the cladding member. This tension is created by the L-shaped bracket in combination with the cladding ends as the L-shaped bracket engages one cladding member end and is pivoted into an indentation, or recess, in the frame or sash. The other cladding member end engages a groove along the side of the frame or sash opposite to the indentation.