Laminated Roof Shingle Tab Width and Step-Off Design
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Solution Overview
Problem
Laminated asphalt shingles lack the aesthetic appeal of wood shingles due to their thinner appearance, despite offering cost, service life, and flammability advantages.
Innovation Solution
The design of laminated asphalt shingles with a first sheet having a mineral granule surface and a second sheet with tab cut-outs, where the tab cut-outs are aligned to create a step-off area that enhances the visual thickness illusion by using a contrasting colored mineral granule surface and visible markings for proper installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If laminated asphalt shingles are manufactured with standard tab width and single-layer construction, then manufacturing cost is reduced and production is simplified, but aesthetic appearance and visual thickness are insufficient compared to wood shingles
Solution Approach 1:
The shingle is divided into multiple layers (base mat layer, overlay layer, and intermediate layer) with tab cutouts at different positions. This segmentation creates a multi-dimensional structure that produces shadow effects and visual depth, making the shingle appear thicker without actually increasing material thickness.
Solution Approach 2:
The patent introduces a third dimension of visual perception through layered construction and shadow play. By stacking multiple layers with offset tab cutouts, the design creates perceived depth and thickness along the vertical dimension, transforming a two-dimensional flat shingle into a three-dimensional visual structure.
2Shape
If the overlay layer width is reduced to create tab-simulating areas, then aesthetic appearance is improved, but the exposed base layer area increases which may affect durability
Solution Approach 1:
The intermediate layer is applied selectively only to specific areas where enhanced tab definition is needed, rather than covering the entire shingle surface. This localized application maintains the durability benefits of exposed mineral granules in critical areas while improving the aesthetic appearance of tab edges where visual definition is most important.
Data Source
AI summary
A laminated composition shingle includes a first sheet having a first mineral granule surface and a first rectangular shape without tab cut-outs laminated with a second sheet having a second mineral granule surface. The second sheet has tab cut-outs along only one longer edge of the second sheet. The laminated composition shingle has a shingle width and an exposure width perpendicular to the long edges and a first width that is twice the exposure width. The shingle width is the first width plus 2 inches (51 mm). The tab cut-outs have a tab width in the direction of the shingle width less than the exposure width minus ⅛ of an inch (3 mm).