Inverted Fleece-Back Flashing Assembly for Low-Energy Roof Membranes
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Solution Overview
Problem
Conventional coatings struggle to adhere effectively to substrates with low surface energies, such as those with surface energies of 40 mN/m or less, which are commonly found in roofing systems.
Innovation Solution
The use of an inverted fleece back membrane system, where the fleece layer is positioned as the uppermost side and is welded to a low surface energy substrate, allowing a liquid applied flashing to be applied directly to the fleece layer, thereby enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional coatings are applied directly to low surface energy substrates, then the application process is simple, but the adhesion strength is insufficient
Solution Approach 1:
The patent introduces a fleece layer as an intermediary between the low surface energy substrate and the liquid applied flashing. The fleece layer has high surface energy and provides a suitable surface for coating adhesion, while the substrate maintains its low surface energy properties. This mediator resolves the adhesion problem without requiring modification of the original substrate or flashing materials.
Solution Approach 2:
The invention creates a composite structure consisting of the substrate, fleece layer, and liquid applied flashing. This composite material system combines the waterproofing properties of the flashing with the adhesion benefits of the fleece layer, achieving both strong bonding and effective water protection.
2Strength
If the fleece layer is positioned as the uppermost side and welded to the substrate, then adhesion is improved, but the installation process becomes more complex
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the fleece layer as the uppermost side rather than the lower side. This inversion allows the fleece to serve as the bonding surface for the liquid applied flashing, while the substrate remains at the bottom. The welded configuration maintains structural integrity while enabling effective adhesion.
3Reliability
If liquid applied flashing is applied to the fleece layer, then waterproofing effectiveness is enhanced, but the number of materials increases
Solution Approach 1:
The fleece layer serves multiple functions: it provides a high surface energy substrate for flashing adhesion, acts as a bonding interface, and contributes to the overall waterproofing system. This multi-functionality reduces the need for separate adhesion promoters or primers, effectively managing material quantity while enhancing reliability.
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 achieves improved adhesion of the liquid applied flashing to low surface energy substrates, with peel strengths ranging from 2 to 15 PLI, ensuring effective waterproofing in roofing systems.
Implementation Method 1
welded to a low surface energy substrate
Data Source
AI summary
Roofing systems are provided. A roofing system comprises a roofing substrate. The roofing system comprises a first roofing membrane adhered to the roofing substrate. The roofing system comprises a second roofing membrane. The second roofing membrane comprises a first layer and a fleece layer. The first layer of the second roofing membrane is located between the fleece layer and the first roofing membrane. The roofing system comprises a liquid applied flashing located on the fleece layer of the second roofing membrane. Related methods are also provided.