Bitumen Moisture Barrier with Reflective Top Layer
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Solution Overview
Problem
Existing bitumen-based moisture prevention systems for building structures, particularly walls, are inadequate as they are sensitive to UV light, which degrades their watertightness, and often require heating for application, risking toxic substance release and absorption.
Innovation Solution
A layered structure comprising a bitumen layer with a UV-resistant aluminium foil top layer and a peelable protective film, which reflects UV light, reduces heating risks and allows for safer, quicker application by sticking instead of heating, and features fibres for improved adhesion and tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black plastic layer is applied to protect the bitumen layer from UV light, then the bitumen layer is protected against UV degradation, but the surface temperature increases due to light absorption
Solution Approach 1:
The patent changes the color/reflectivity properties of the top layer from black (absorptive) to white or light-reflecting colors. This allows the layer to protect against UV light while reflecting visible light to minimize heat absorption, thereby reducing surface temperature compared to black plastic coatings.
Solution Approach 2:
The patent uses a composite top layer combining reflective materials (such as metal flakes, glass beads, or white pigments) with UV-resistant polymers. This composite structure provides both UV protection and thermal reflection properties, resolving the contradiction between needing UV shielding and minimizing heat absorption.
2Strength
If heating is used to apply the bitumen layer, then adhesion is improved, but toxic substances are released and absorbed
Solution Approach 1:
The patent replaces the thermal application method with a mechanical or chemical bonding mechanism. The bitumen layer is designed to adhere through pressure-sensitive adhesion or chemical bonding at ambient temperatures, eliminating the need for heating and thereby preventing toxic substance release during application.
Solution Approach 2:
The patent modifies the bitumen layer's formulation to enable adhesion at lower temperatures by changing its rheological parameters or incorporating adhesion promoters. This allows the material to achieve sufficient bonding strength without thermal activation, thus avoiding toxic emissions.
3Reliability
If the protective film is applied continuously, then protection is maintained, but application time increases
Solution Approach 1:
The protective film is divided into modular sections or strips that can be applied separately and quickly. This segmentation allows workers to apply only the necessary portions in a streamlined sequence, reducing total application time while maintaining continuous protection coverage through overlapping or adjacent placement of segments.
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 effectively protects the bitumen layer from UV degradation, reduces thermal warming, and facilitates safer, faster application with reduced toxic substance release, while maintaining high tensile strength and adhesion for effective moisture transfer prevention in building structures.
Implementation Method 1
The UV-resistant top layer comprises aluminium, more preferably an aluminium foil, to make the layered structure at least partially UV reflective to light from above. By applying the layered structure, by which the UV-resistant, and the aluminium UV-resistant, top layer shields the bitumen layer, not only is the bitumen layer protected against UV light, but part of the incident light is also reflected. This helps to prevent the layered structure from warming up.
Data Source
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AI summary
The invention relates to a layered structure and a method for preventing moisture transfer in a building structure, preferably preventing ascending moisture in a wall. The layered structure comprises a bitumen layer comprising a self-adhesive lower side and an upper side, a UV-resistant top layer on the upper side of the bitumen layer, and a water-resistant peelable protective film on the lower side of the bitumen layer. The top layer preferably comprises fibres bringing about irregularities at the surface of the layered structure for an improved attachment of building materials.