Prefabricated Wall Outer Foam Layer Airflow Pathways

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Solution Overview

Problem

Conventional prefabricated wall assemblies suffer from reduced thermal resistance and weather penetration due to seams in insulating panels and exterior sheathing, leading to potential damage from environmental elements.

Innovation Solution

A prefabricated wall assembly with an outer foam layer comprising particles and a binder, which creates pathways for airflow and drainage, enhancing thermal resistance and preventing weather infiltration by extending from the frame assembly to the exterior surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If preformed panels are used for insulating layer, then manufacturing efficiency is improved, but thermal resistance is reduced due to seams between panels

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidthermal resistance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent combines multiple preformed insulating panels into a single continuous layer by applying adhesive to the seams and pressing them together. This merging eliminates the thermal breaks at seams while maintaining the manufacturing efficiency benefits of using preformed panels, thereby resolving the contradiction between productivity and thermal resistance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent converts the harmful effect of seams (which reduce thermal resistance) into a beneficial bonding interface by applying adhesive to the seam areas. The seams become bonding zones that join panels together while minimizing thermal loss, transforming the defect into a functional advantage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of operation

If preformed sheets are used for exterior sheathing, then ease of installation is improved, but weather penetration is increased due to seams between sheets

Engineering Contradiction:

Improveease of installationVSAvoidweather penetration

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent merges adjacent exterior sheathing sheets by applying adhesive to their seams and pressing them together. This creates a continuous weather-resistant barrier that maintains the installation simplicity of preformed sheets while eliminating the penetrative pathways that seams would otherwise provide.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent converts the harmful seams in exterior sheathing into beneficial bonding zones by applying adhesive. The seam areas become sealed interfaces that prevent water and air infiltration while maintaining the ease of installation provided by preformed sheets.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If barrier layer is added to minimize weather penetration, then protection is improved, but device complexity is increased

Engineering Contradiction:

Improveweather penetration protectionVSAvoidassembly complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent makes the adhesive serving multiple functions: it bonds insulating panels to each other, bonds exterior sheathing sheets to each other, and provides weather sealing at all seam locations. This multi-functionality eliminates the need for a separate barrier layer, reducing assembly complexity while maintaining protection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the functions of structural bonding and weather barrier protection into a single adhesive system. By merging these functions, the patent eliminates the need for additional barrier layers, thereby reducing device complexity while maintaining or improving weather penetration protection.

Inventive Principle:

Principle #5Merging (Combining)

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 outer foam layer provides increased thermal resistance and prevents environmental elements from entering the building by allowing airflow and drainage, while maintaining structural integrity and reducing water adsorption.

Implementation Method 1

The pathways extend from the top member to the bottom member of the frame assembly for allowing airflow and drainage between the frame assembly and the exterior covering

Methodology Applied

Scientific EffectAirflow: Convection

Implementation Method 2

The pathways of the outer foam layer provide the prefabricated wall with an increased thermal resistance

Methodology Applied

Scientific EffectThermal resistance: Thermal Insulation

Data Source

PatentUS9702152B2Prefabricated wall assembly having an outer foam layer

Publication Date: 2017.07.11 BASF SE

AI summary

A prefabricated wall assembly receives an exterior covering of a building. The prefabricated wall assembly comprises a frame assembly and an outer foam layer. The outer foam layer is coupled to the frame assembly. The outer foam layer extends from the frame assembly to an exterior surface of the outer foam layer. The exterior surface of the outer foam layer is configured to receive the exterior covering of the building. The outer foam layer comprises a plurality of particles and a binder that define a plurality of pathways. The pathways extend vertically through the prefabricated wall assembly from the top member to the bottom member of the frame assembly for allowing airflow and drainage between the frame assembly and the exterior covering.