Composite Roofing Membrane With Inorganic Coating for Impact Resistance
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Solution Overview
Problem
Single-ply roofing membranes lack sufficient impact resistance, particularly in steep slope applications, leading to potential damage from hail and other objects, and are susceptible to water penetration through holes or perforations.
Innovation Solution
A novel composite roofing membrane comprising a base layer of thermoplastic polyolefin with a coating layer containing inorganic additives and polypropylene, which includes structural features like air pockets or voids to enhance impact resistance and thermal insulation, and can be installed using mechanical fasteners or adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-ply roofing membranes are used, then installation is simplified and material cost is reduced, but impact resistance is insufficient leading to damage from hail and other objects
Solution Approach 1:
The patent applies composite materials by combining a base layer (polymer-modified bitumen or asphalt) with a reinforcing scrim layer and a protective granular coating layer. This multi-layer composite structure provides both the installation simplicity of single-ply membranes and the impact resistance of reinforced construction, directly resolving the technical contradiction between ease of installation and impact resistance.
Solution Approach 2:
The patent implements nesting by embedding the polymer-modified bitumen membrane within a composite structure that includes an inner layer, a reinforcing scrim, and an outer granular coating. Each layer is nested within the others to create a unified roofing system that maintains the advantages of the base membrane while adding protective functionality.
2Loss of time
If single-ply roofing membranes are used, then installation time is reduced, but susceptibility to water penetration through holes or perforations increases
Solution Approach 1:
The patent uses composite materials with multiple functional layers: a polymer-modified bitumen base layer for waterproofing, a reinforcing scrim for structural integrity, and a granular coating for protection. This composite construction maintains rapid installation while significantly improving resistance to water penetration through punctures or holes.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating a reinforcing scrim layer within the composite structure that provides preemptive reinforcement against punctures and perforations. This reinforcing layer acts as a cushion or barrier that prevents water penetration before it can occur through the membrane.
3Productivity
If conventional asphalt shingles are replaced with composite membrane, then material cost is reduced and installation time is reduced, but impact resistance must be maintained
Solution Approach 1:
The patent employs composite materials that combine the cost-effectiveness and installation speed of single-ply membranes with the impact resistance traditionally associated with multi-layer built-up roofing or asphalt shingles. The polymer-modified bitumen base with reinforcing scrim provides this balanced performance.
Solution Approach 2:
The patent applies parameter changes by modifying the bitumen with polymers to enhance flexibility and impact resistance while maintaining the single-ply membrane format. This chemical modification allows the material to achieve improved mechanical properties without sacrificing installation efficiency.
Data Source
AI summary
A roofing composite membrane includes a base layer including a first thermoplastic polyolefin. A weight of the base layer is between 5 and 25 grams per square foot. A coating layer at least partially coats the base layer. The coating layer includes at least one inorganic additive, and a second thermoplastic polyolefin including polypropylene and having a melt flow rate between 0.5 grams per 10 minutes and 12 grams per 10 minutes.