Foam Wall Structure Shear Strength via Braced Cavity
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Solution Overview
Problem
Current insulated wall panel solutions, such as pre-fabricated panels and Structural Insulated Panels (SIPs), face challenges in meeting stringent insulation requirements while being cost-effective and labor-efficient, particularly in providing adequate shear strength for seismic and high-load applications, and often require additional materials and labor for installation.
Innovation Solution
A foam wall structure incorporating a foam panel attached to a frame with a brace disposed within a cavity, featuring a plurality of brace members connected by lateral load-bearing connectors, enhances shear strength and thermal performance without the need for additional materials like OSB or house wrap, allowing for pre-fabricated construction and reduced on-site labor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-fabricated wall panels with fiberglass insulation are used, then installation is simple, but the R-value is suboptimal and air barrier performance is poor
Solution Approach 1:
The patent combines rigid foam insulation boards with adhesive materials and vapor barrier materials to create a composite wall panel system. The rigid foam provides both insulation and structural integrity, while the adhesive and vapor barrier layers ensure continuous air sealing and prevent moisture intrusion, resolving the contradiction between simple installation and reliable air barrier performance.
2Reliability
If SIPs with EPS foam are used, then thermal performance is provided, but the R-value per inch is limited and additional materials are required
Solution Approach 1:
The patent changes the insulation material parameter from EPS foam to rigid foam insulation boards with higher R-value per inch. This parameter change allows achieving the same or better thermal performance with less material thickness, reducing the quantity of substance needed while maintaining reliable thermal performance.
3Strength
If increased nailing pattern is used to strengthen walls, then shear strength is improved, but labor intensity increases
Solution Approach 1:
The patent incorporates bracing members and shear wall panels into the wall assembly during pre-fabrication before the wall is installed on-site. This preliminary action provides the necessary shear strength in advance, eliminating the need for increased nailing patterns during construction and maintaining high construction speed without sacrificing strength.
4Adaptability or versatility
If on-site insulation installation is performed, then flexibility is maintained, but installation inconsistencies and trade scheduling conflicts occur
Solution Approach 1:
The patent pre-installs rigid foam insulation boards, adhesive materials, and vapor barrier materials into wall panels at a controlled manufacturing environment before delivery to the construction site. This preliminary action ensures consistent and precise insulation installation without the variability and scheduling conflicts associated with on-site installation, while still providing adaptability through pre-fabricated panel configurations.
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 provides improved shear strength and thermal performance, meeting stringent insulation standards while reducing construction costs and labor, and simplifying installation processes, ensuring consistent insulation and easier integration of utility components.
Implementation Method 1
a foam layer received within at least a portion of one of the voids within the frame, wherein the foam layer adheres to at least a portion of the faced polyisocyanurate panel
Implementation Method 2
a faced polyisocyanurate panel attached to at least a portion of a front frame surface
Data Source
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AI summary
Wall structures and methods of manufacturing wall structures are described. The wall structures include a frame, a foam panel attached to the frame, a brace disposed in a cavity defined by the frame, and a foam layer. The wall structures can impart a high wall racking strength and good thermal performance through the combination of the foam layer, brace, and the foam panels.