Structural Insulated Sheathing Lamination for Thermal and Load Performance
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Solution Overview
Problem
Conventional structural sheathing materials do not provide significant insulation value and lack structural strength when used in building construction, necessitating additional insulation methods and materials to enhance both insulation and structural integrity.
Innovation Solution
A structural insulated sheathing system comprising a rigid foam insulation board laminated to a structural member with multiple plies of cellulose fiber, using a cross-linking adhesive over 100% of their interface to enhance bonding and structural strength, while also providing improved insulation and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional structural sheathing materials (plywood, OSB, gypsum board) are used, then structural strength is improved, but insulation value remains insufficient
Solution Approach 1:
The patent combines structural sheathing and insulation into a single integrated panel by laminating rigid foam insulation board to the interior face of structural sheathing (OSB or plywood). This merging eliminates the need for separate insulation installation and provides both structural strength and thermal insulation in one component.
Solution Approach 2:
The patent creates a composite material system by bonding dissimilar materials (structural sheathing and rigid foam insulation) together through lamination. The structural sheathing provides strength and rigidity while the foam insulation provides thermal resistance, creating a composite panel with superior combined performance.
2Loss of energy
If rigid foam insulation board is attached to exterior of structural sheathing, then insulation value is improved, but structural strength and fastener resistance deteriorate
Solution Approach 1:
Instead of attaching insulation to the exterior of structural sheathing, the patent inverts the arrangement by placing rigid foam insulation on the interior face and structural sheathing on the exterior. This inversion allows the structural sheathing to remain exposed for fastener attachment while the insulation is protected and integrated on the interior side.
Solution Approach 2:
The patent uses an adhesive layer as an intermediary between the rigid foam insulation board and the structural sheathing. This adhesive mediator provides strong bonding that transfers structural loads and fastener forces effectively from the sheathing through the adhesive to the insulation, maintaining structural integrity.
3Loss of energy
If rigid foam insulation board is laminated to structural member, then insulation and stiffness are improved, but bonding strength may be insufficient without proper adhesive
Solution Approach 1:
The patent specifies using adhesives with particular properties (high bond strength, compatibility with both OSB/plywood and foam materials) to ensure reliable bonding. The adhesive parameters are selected to match the thermal and mechanical characteristics of the bonded materials, creating a durable connection that maintains both insulation performance and structural integrity.
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 achieves a significant improvement in structural strength, comparable to 7/16″ OSB, with enhanced insulation and stiffness, and improved fastener pull resistance, demonstrating up to 17% improvement in maximum load and comparable performance to conventional insulation methods.
Implementation Method 1
The first face of the foam insulation board is laminated to the second face of the structural member
Implementation Method 2
A structural insulated sheathing including a rigid foam insulation board having a first face and a structural member having a second face
Data Source
AI summary
A structural insulated sheathing including a rigid foam insulation board having a first face, a structural member having a second face, wherein the first face of the foam insulation board is laminated to the second face of the structural member over substantially 100% of the interface between the first face and the second face.