Roofing Membrane Sealing Strip for PVC-to-Non-PVC Joints
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Solution Overview
Problem
Existing methods fail to effectively join PVC and non-PVC roofing membranes, leading to inadequate adhesion, durability issues, and susceptibility to environmental conditions, limiting the creation of hybrid roofing systems that combine both materials.
Innovation Solution
A method involving a water impermeable liquid applied membrane is used to create a durable, watertight seal between adjacent roofing membranes, utilizing polymer resin primer layers and a sealing strip to bond incompatible membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive bonding is used to join PVC and non-PVC membranes, then the membranes can be connected, but the adhesion strength is poor and unreliable
Solution Approach 1:
The patent introduces a sealing strip as an intermediary component between the PVC and non-PVC membranes. This sealing strip acts as a mediator that is compatible with both membrane types, enabling reliable bonding without direct contact between the incompatible PVC and non-PVC materials. The sealing strip creates a bridge that allows adhesive bonding to work effectively across the joint.
Solution Approach 2:
The patent segments the joint assembly into distinct components: the PVC membrane, the sealing strip, and the non-PVC membrane. By dividing the joint into separate elements rather than attempting direct bonding, the system allows each component to be optimized for its specific function, with the sealing strip providing the necessary adhesion interface between the incompatible materials.
2Ease of manufacture
If heat welding is used to join PVC and non-PVC membranes, then the membranes can be connected, but seam failures occur due to inadequate fusion or overheating
Solution Approach 1:
The sealing strip serves as a mediator that prevents direct heat contact between PVC and non-PVC membranes, eliminating the risk of inadequate fusion or overheating. The sealing strip creates a thermal barrier that allows the joint to be formed without subjecting the incompatible materials to excessive heat, thereby preventing seam failures.
3Ease of manufacture
If mechanical fastening is used to join PVC and non-PVC membranes, then initial attachment is provided, but the integrity of the roofing system is compromised over time
Solution Approach 1:
The sealing strip acts as a mediator that distributes mechanical loads and prevents water infiltration at the joint between PVC and non-PVC membranes. By creating a sealed interface rather than relying on mechanical fasteners alone, the system maintains long-term integrity and prevents degradation over time.
4Device complexity
If PVC and non-PVC membranes are placed in direct contact, then the joint is simple, but plasticizer migration occurs from PVC to non-PVC membrane adversely affecting performance
Solution Approach 1:
The patent segments the joint by placing the sealing strip between the PVC and non-PVC membranes, preventing direct contact. This segmentation isolates the plasticizer migration issue to the sealing strip interface rather than allowing it to affect the entire membrane system, thereby preserving the performance of both membrane types.
Solution Approach 2:
The sealing strip serves as a barrier that prevents plasticizer migration from the PVC membrane to the non-PVC membrane. By introducing this intermediary layer, the system blocks the harmful chemical interaction while still allowing the joint to function as a unified waterproofing system.
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 the formation of hybrid roofing systems with both PVC and non-PVC membranes, reducing repair and installation costs while ensuring long-term water tightness and durability.
Implementation Method 1
adhesively bonding the sealing strip via the lower major surface to at least a portion of the first polymer resin primer layer PR1 and at least a portion of the second polymer resin primer layer PR2
Data Source
AI summary
A method for sealing adjacent roofing membranes of a hybrid roofing assembly. The method involves applying a sealing strip to establish a connection between the adjacent roofing membranes and creating a durable water tight seal at a joint between the adjacent roofing membranes, using a water impermeable liquid applied membrane. The method enables connecting in a water-tight fashion two incompatible roofing membranes using a water impermeable liquid applied membrane, thereby enabling the creation of hybrid roofs and reducing both repair and installation expenses.