Thermally Isolated MFI-Brackets for Wall Insulation
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Solution Overview
Problem
Existing construction methods create thermal bridges in walls, reducing insulation effectiveness and leading to energy loss, moisture issues, and limited options for exterior cladding, especially with heavy materials like brick or stone, which increases costs and complicates refurbishment and energy efficiency.
Innovation Solution
A modular system using thermally isolated MFI-brackets that secure non-flammable insulation and allow for various exterior claddings, with a rain screen to manage moisture and reduce thermal transfer, while accommodating different cladding materials and providing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional wall assembly methods are used with spaced apart studs and insulation between studs, then installation is straightforward and allows for service conduit placement, but thermal bridges are created through the studs reducing insulation effectiveness
Solution Approach 1:
The wall assembly is segmented into distinct functional layers: weather resistive barrier, insulation layer, vapor barrier, and interior sheathing. Each layer is independently installed in specific sequences, allowing the insulation to be continuously applied without interruption by structural members, thereby eliminating thermal bridges while maintaining ease of installation through modular layering.
Solution Approach 2:
A vapor barrier is introduced as an intermediary layer between the insulation and the interior sheathing. This vapor barrier prevents moisture migration that would otherwise compromise insulation effectiveness, while the weather resistive barrier serves as another intermediary layer protecting the insulation from exterior moisture. These intermediary layers protect the insulation's thermal performance without adding significant thermal conductivity.
2Loss of energy
If continuous insulation is installed to eliminate thermal bridges, then energy efficiency is improved, but the ability to accommodate heavy exterior cladding like brick or stone is reduced
Solution Approach 1:
The wall assembly is divided into separate functional layers with the insulation continuously applied between the weather resistive barrier and vapor barrier. This segmentation allows the insulation to be uninterrupted by cladding support structures, maintaining thermal efficiency while the weather resistive barrier and vapor barrier provide protective functions that enable the use of heavy exterior cladding materials.
Solution Approach 2:
The weather resistive barrier and vapor barrier act as intermediary protective layers that shield the continuous insulation from moisture exposure. This protection allows the insulation to maintain its thermal performance without requiring gaps or interruptions for cladding support, thereby enabling the use of heavy exterior cladding materials like brick or stone while preserving energy efficiency.
3Loss of energy
If insulation is installed between wall studs, then thermal transfer is reduced, but moisture accumulation and condensation issues occur
Solution Approach 1:
A vapor barrier is introduced as an intermediary layer between the insulation and the interior sheathing. This vapor barrier prevents moisture-laden air from penetrating the insulation, thereby eliminating condensation issues while maintaining the insulation's thermal performance. The weather resistive barrier serves as another intermediary layer preventing exterior moisture from reaching the insulation.
Solution Approach 2:
Thin film vapor barriers are used to create a moisture-resistant layer that allows thermal energy to pass through while blocking moisture migration. These flexible thin films prevent condensation within the insulation without compromising thermal transfer performance, effectively separating the thermal and moisture control functions.
4Ease of operation
If exterior cladding is attached directly to insulation, then cladding installation is simplified, but thermal bridges are created at the attachment points
Solution Approach 1:
A weather resistive barrier is introduced as an intermediary layer between the exterior cladding and the insulation. This barrier prevents direct thermal contact between metal fasteners and the insulation, thereby eliminating thermal bridges at attachment points while maintaining simple cladding installation procedures. The barrier layer allows mechanical attachment without creating thermal conduction paths.
Solution Approach 2:
Thin film weather resistive barriers are used to separate the cladding attachment system from the insulation layer. These thin films prevent thermal conduction through fasteners while maintaining ease of cladding installation, effectively decoupling the mechanical and thermal functions without adding significant thermal resistance.
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 enhances energy efficiency by minimizing thermal bridges, managing moisture, and allowing for a variety of exterior claddings, including heavy materials, while maintaining structural integrity and compliance with energy efficiency standards.
Implementation Method 1
A weather resistive barrier formed of material such as asphalt impregnated paper, plastic sheeting, building wrap or similar product may be attached to exterior facing edges of the wall studs, extending from stud to stud and from floor plate to ceiling plate. The weather resistive barrier inhibits flow of air and moisture through any gaps that may exist in the wall assembly.
Implementation Method 2
The object is to 'fill' the space between the wall studs extending from the floor plate to the ceiling plate to limit thermal transfer from the interior of the structure wall to the exterior of the structure wall, and visa versa depending upon the structure's interior operating conditions and the outside climate.
Implementation Method 3
A vapor barrier such as plastic sheeting or the like may be attached to the interior facing edges of the wall studs extending from wall stud to wall stud and from the ceiling plate to the floor plate enclosing the insulation between the wall studs and between the inner vapor barrier and outer weather resistive barrier.
Implementation Method 4
MFI-brackets having a base portion secured to an exterior surface of a structure wall... positionally maintain non-flammable insulation adjacent the structure wall... thermally isolated MFI-brackets... minimize thermal bridges
Implementation Method 5
providing a rain screen between the continuous thermal insulation and the exterior cladding... managing moisture... allowing for vertical and horizontal re-plumbing of exterior cladding
Data Source
AI summary
A modular system for continuously insulating exterior walls of a structure and cladding the structure walls provides thermally isolated MFI-brackets secured to a structural wall supporting thermally isolated vertical or horizontal rails supporting exterior cladding. Thermal insulation is positionally retained against the structure wall interior of the exterior cladding by the MFI-brackets and a pressure equalized moisture controlling rain screen is maintained between the interior surface of the exterior cladding and an exterior facing surface of the insulation.