Pre-fabricated Insulated Foam Wall Structures with High Racking Strength
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Solution Overview
Problem
Current insulated wall panel solutions, such as those incorporating fiberglass or Structural Insulated Panels (SIPs), face challenges in meeting strict insulation standards, requiring additional materials and labor, and often rely on wood or OSB panels with high fastener pull-out strength, which can lead to inconsistencies and increased costs.
Innovation Solution
A method of manufacturing pre-fabricated insulated wall structures by spray applying a foam-forming composition into a cavity within a frame, allowing the foam to expand and adhere to a foam panel, achieving a high racking strength of at least 500 pounds per linear foot without the need for wood or OSB panels, by controlling foam density and environmental conditions during application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wood panels, plywood panels, or OSB panels are used to achieve high racking strength, then the structural strength is improved, but the material cost and complexity increase
Solution Approach 1:
The patent removes wood panels, plywood panels, and OSB panels from the wall structure, retaining only foam panels. The foam panels are equipped with reinforcement members and adhesive layers that provide the necessary racking strength without requiring additional wood-based panels, thereby simplifying the overall structure while maintaining strength requirements.
Solution Approach 2:
The patent creates a composite structure by combining foam panels with reinforcement members (such as metal or wood strips) and adhesive layers. This composite approach allows the foam panel itself to provide thermal insulation while the reinforcement members provide structural strength, eliminating the need for separate wood panel layers.
2Ease of manufacture
If fiberglass batting is used for insulation, then the insulation material is easy to install, but the R-value and air barrier performance are insufficient
Solution Approach 1:
The patent uses foam panels as the insulation material, which provides homogeneous and consistent thermal performance throughout the wall assembly. The foam panels maintain uniform density and R-value properties, eliminating the variability and installation inconsistencies associated with fiberglass batting while still being easy to install as pre-fabricated units.
3Reliability
If additional materials such as OSB panels and house wrap are used, then the wall structure meets insulation requirements, but the material cost and construction time increase
Solution Approach 1:
The foam panels serve multiple functions simultaneously: they provide thermal insulation, act as an air barrier, and contribute to the structural integrity of the wall assembly when combined with reinforcement members and adhesive. This multi-functionality eliminates the need for separate OSB panels and house wrap layers, reducing material quantity while meeting all insulation requirements.
Solution Approach 2:
The patent merges the functions of insulation, air barrier, and structural support into a single integrated foam panel system with reinforcement members and adhesive layers. This consolidation eliminates the need for multiple separate material layers (fiberglass, OSB, house wrap), reducing both material quantity and construction complexity while maintaining compliance with insulation requirements.
4Ease of manufacture
If foam panels with low fastener pull-out strength are used, then the material cost is reduced, but the racking strength is insufficient
Solution Approach 1:
The patent applies adhesive layers to the foam panels and reinforcement members before assembly, creating a strong bonded connection that compensates for the low fastener pull-out strength of the foam panels. The preliminary application of adhesive ensures that the structural strength is achieved through chemical bonding rather than relying solely on mechanical fasteners, thereby maintaining racking strength while using cost-effective foam panel materials.
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
This approach results in consistent, high-strength insulated wall structures that meet stringent insulation requirements, reduce material and labor costs, and eliminate the need for additional panels, while improving thermal performance and installation efficiency.
Implementation Method 1
the foam layer adheres to at least a portion of the polyiso panel
Implementation Method 2
allowing the foam-forming material to expand within at least a portion of the cavity to form a foam layer deposited in the cavity
Data Source
AI summary
Methods of manufacturing wall structures having high racking strength are described in this specification. The methods include spray applying a foam-forming composition into a cavity of a wall structure, wherein the wall structure is disposed in a climate-controlled spray application station and allowing the foam-forming material to expand within at least a portion of the cavity to form a foam layer deposited in the cavity. In the methods, the foam layer is formed in-situ during the manufacturing method, and the density of the foam layer is selected and the relative humidity and dew point of the air in the climate-controlled spray application station throughout the spray applying is selected so that the wall structure has a racking strength of at least 500 pounds per linear foot.