Double-Sided Separation Sheet for Fully Adhered Roof Waterproofing
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Solution Overview
Problem
Existing waterproofing and roofing membranes face challenges in providing fully-adhered systems for green roofs and aged bitumen roof systems due to volatile compound migration, leading to increased complexity and costs, and the need for a simplified installation method.
Innovation Solution
A double-sided self-adhering separation sheet with distinct adhesive layers on a polymeric carrier layer, eliminating the need for self-adhering membranes and contact adhesives, allowing for reduced material and installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-adhering membranes with pre-applied adhesive layers are used, then fully-adhered roof systems can be provided, but the complexity and costs increase due to migration barriers being required
Solution Approach 1:
The patent introduces a separation sheet as an intermediary component between the substrate and the roofing membrane. This separation sheet includes a adhesive layer that bonds to the substrate and a release liner that prevents premature adhesion. By using this intermediary, the patent eliminates the need for migration barriers in the membrane itself, thereby reducing complexity while maintaining reliable adhesive bonding.
Solution Approach 2:
The patent segments the adhesive bonding function into a separate component (the separation sheet) rather than integrating it into the membrane structure. The separation sheet is a distinct layer with its own adhesive properties, which separates the bonding function from the waterproofing function of the membrane, allowing each component to be optimized independently.
2Object-affected harmful factors
If migration barriers are added to membranes to prevent volatile compound migration, then adhesive layer protection is improved, but production costs and installation complexity increase
Solution Approach 1:
The separation sheet acts as a protective intermediary between the volatile compounds in the substrate and the adhesive layer. Instead of adding barriers within the membrane structure, the separation sheet provides this protective function externally, simplifying membrane manufacturing while still protecting the adhesive layer from harmful volatile compounds.
3Reliability
If contact bonding is used to adhere membranes to substrates, then adhesive bonding can be achieved, but installation time and volatile compound emissions increase
Solution Approach 1:
The separation sheet comes pre-coated with an adhesive layer and pre-covered with a release liner during manufacturing. This preliminary preparation eliminates the need for on-site adhesive application and flashing-off processes, allowing installers to simply peel and stick the membrane directly to the substrate, thereby significantly reducing installation time.
Solution Approach 2:
The separation sheet is designed to be self-adhering through its pre-applied adhesive layer, eliminating the need for separate contact adhesive application steps. The system serves itself by incorporating the adhesive function directly into the separation sheet component, streamlining the installation process.
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
Enables fully-adhered roof systems with reduced material and installation costs by using PVC and bitumen membranes without migration barriers, simplifying the construction of new green roofs and renovating aged bitumen roofs.
Implementation Method 1
A first adhesive layer (3) composed of a first adhesive composition and a second adhesive layer (4) composed of a second adhesive composition different from the first adhesive composition
Data Source
AI summary
A separation sheet includes a polymeric carrier layer, a first adhesive layer, a second adhesive layer, and optionally a first and a second release liner. A method for producing a separation sheet, a method for waterproofing a substrate, a waterproofed substrate, and a use of the separation sheet for bonding of roof membranes to roof substrates.