Wall Assembly with Integrated Closed Cell Foam Sheathing
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Solution Overview
Problem
Conventional wall assemblies for buildings face issues with thermal resistance, moisture penetration, and structural integrity due to seams in insulating and sheathing layers, which compromise energy efficiency and durability.
Innovation Solution
A wall assembly comprising a frame assembly, a sheathing layer with a closed cell foam layer bonded to the frame, and an outer fiberboard, where the closed cell foam layer is made of materials like expanded polystyrene, extruded polystyrene, or polyisocyanurate, providing thermal and moisture resistance while the fiberboard offers structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If preformed panels are used for insulating layer, then ease of manufacture is improved, but thermal resistance deteriorates due to seams between panels
Solution Approach 1:
The patent merges the insulating layer and sheathing layer into a single integrated foam layer. This eliminates the seams between separate panels while maintaining ease of manufacture through a continuous foam structure that provides both insulation and structural support functions simultaneously.
Solution Approach 2:
The patent uses a composite foam structure that combines insulating properties with sheathing functionality. The foam layer integrates multiple functions (insulation, structural support, and weather resistance) into a single material system, eliminating the need for separate panels and their associated seams.
2Ease of manufacture
If preformed sheets are used for exterior sheathing, then ease of manufacture is improved, but moisture penetration worsens due to seams between sheets
Solution Approach 1:
The patent combines the exterior sheathing function with the insulating foam layer into a single continuous foam structure. This eliminates seams between separate sheathing sheets while maintaining ease of manufacture, and simultaneously prevents moisture penetration through the continuous foam barrier.
Solution Approach 2:
The patent uses a continuous foam layer that acts as a flexible barrier shell. This thin film structure provides seamless coverage that prevents moisture and weather elements from penetrating through gaps or seams, while still being easy to manufacture as a continuous material.
3Loss of energy
If rigid foam layer is placed on exterior of sheathing layer, then thermal break is improved, but structural integrity worsens due to damage during handling and installation
Solution Approach 1:
The patent merges the rigid foam layer with the sheathing layer into a single integrated foam structure. This eliminates the need for separate layers that could be damaged during handling, while maintaining the thermal break function through the continuous foam material that provides both insulation and structural strength.
Solution Approach 2:
The patent uses a composite foam structure that combines the thermal insulation properties with enhanced structural integrity. The foam material itself provides both the thermal break and the structural strength needed to resist damage during handling and installation, eliminating the need for separate protective layers.
4Ease of manufacture
If fasteners are used to couple sheathing layer to frame assembly, then ease of manufacture is improved, but weather element penetration worsens due to seams and fastener gaps
Solution Approach 1:
The patent replaces the mechanical fastening system with a chemical bonding system. The foam layer is bonded to the frame assembly using adhesives or chemical bonding agents, eliminating the need for fasteners that create gaps and seams. This substitution maintains ease of manufacture while preventing weather element penetration through the continuous bonded interface.
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 enhances thermal resistance, moisture resistance, and structural capacity, reducing energy losses and damage from weather elements while maintaining high structural integrity and ease of assembly.
Implementation Method 1
The closed cell foam layer is made of materials like expanded polystyrene, extruded polystyrene, or polyisocyanurate, providing thermal and moisture resistance
Implementation Method 2
The closed cell foam layer is made of materials like expanded polystyrene, extruded polystyrene, or polyisocyanurate, providing thermal and moisture resistance
Data Source
AI summary
Described herein is a wall assembly for use in walls of energy efficient residential or commercial buildings which can provide improved thermal resistance, moisture resistance and structural capacity. The wall assembly includes a frame assembly; a sheathing layer; a closed cell inner foam layer for coupling the layer to the frame assembly; and an outer fiberboard. Also described herein is a method of manufacturing the wall assembly.