Roofing Shingles With Extended Water-Impermeable Sheet
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Solution Overview
Problem
Conventional roofing shingles require significant material usage and can leave potential leak points between adjacent shingles due to the headlap portion extending above the exposure zone, which compromises the integrity of the roof's water-tight seal.
Innovation Solution
A roofing shingle design featuring a water impermeable sheet that extends beyond the head edge and side edges of the shingle body, providing a top and side lapping structure to close the roof to water penetration, while reducing the material usage by minimizing the headlap portion and utilizing structural elements and sealants to direct moisture downward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the headlap portion of shingle material is reduced or eliminated, then material usage is reduced and cost is decreased, but potential leak points are created between adjacent shingles where no shingle material is beneath the joint
Solution Approach 1:
The shingle is divided into distinct functional zones: an exposure zone with full shingle material for aesthetics and primary protection, a fastening zone for mechanical attachment, and a headlap zone with reduced or eliminated shingle material. This segmentation allows material reduction while maintaining protective function through alternative means (adjacent shingle overlap).
Solution Approach 2:
The invention uses the adjacent shingle's exposure zone as an intermediary element to provide the protective function that would normally require headlap material. The neighboring shingle acts as a mediator, extending its exposure zone to cover the joint area, thereby eliminating the need for traditional headlap material while maintaining water-tightness.
2Reliability
If the headlap portion extends above the exposure zone to ensure water-tight sealing, then reliability is improved, but material consumption increases
Solution Approach 1:
The exposure zone of each shingle serves multiple functions: it provides the aesthetic appearance of a traditional shingle, acts as the primary weather protection layer, and extends laterally to function as the headlap protection for adjacent shingles. This multi-functionality eliminates the need for separate headlap material.
Solution Approach 2:
The invention merges the functions of the exposure zone and headlap zone into a single continuous shingle structure. By extending the exposure zone laterally to cover the joint area, the design combines what were traditionally separate functional zones, reducing material usage while maintaining protective integrity.
3Reliability
If conventional shingle material is used throughout the entire shingle including headlap, then water-tight sealing is ensured, but material cost and weight increase
Solution Approach 1:
The shingle design applies different material qualities to different zones: the exposure zone and fastening zone use conventional shingle material with full structural properties, while the headlap zone uses reduced or eliminated material since the protective function is provided by adjacent shingles. This local differentiation optimizes material usage and reduces weight.
Data Source
AI summary
A roofing shingle includes a shingle body having a buttlap portion with a butt edge and a headlap portion with a head edge, a first side edge and a second side edge. An exposure zone extends from the butt edge toward the headlap portion and is configured to be exposed to the environment when the shingle is installed on a roof. A water impermeable sheet is attached to the shingle body and has a width, length, first end and second end. The width extends from between about the butt and head edges to beyond the head edge of the shingle body. The length extends from between about the first and second side edges to beyond the first side edge. The sheet is formed from a different material than the shingle body.