Roofing Shingle Folded Tabs Reduce Cracking
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Solution Overview
Problem
Existing hip, ridge, or rake shingles with multiple laminated layers folded 180° are prone to cracking, affecting their weathering and aesthetic performance.
Innovation Solution
A shingle design featuring a plurality of panels on each side of a panel portion, stacked and sandwiched between extended tabs, with only the outer layer folded 180° to reduce cracking, allowing for adjustable thickness and improved aesthetic appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If multiple laminated layers of shingle material are folded 180° back upon themselves to provide thickness, then the shingle achieves a thick appearance, but cracks can form due to the thickness of the double fold
Solution Approach 1:
The shingle is divided into multiple separate layers: a base layer, intermediate panels, and a folded tab layer. This segmentation allows the thickness to be achieved through stacking multiple thinner layers rather than folding a single thick layer, reducing stress concentration and preventing cracks while maintaining the desired thick appearance.
2Shape
If separate shingles are used for hips, ridges, and rakes to achieve a finished appearance, then aesthetic quality is improved, but the complexity of manufacturing and installation increases
Solution Approach 1:
The shingle design incorporates multiple functional elements within a single product: the main body provides the aesthetic appearance, the extended tabs enable folding for thickness, and the layered construction provides durability. This multi-functional design allows one shingle type to serve multiple purposes that previously required separate shingle varieties.
3Shape
If the number of stacked panels is increased to vary the thickness, then the desired thickness can be achieved, but the manufacturing complexity increases
Solution Approach 1:
The invention allows thickness to be adjusted by changing the number of intermediate panels stacked between the base layer and the folded tab, rather than changing the fundamental construction method. This parameter-based adjustment maintains manufacturing simplicity while enabling thickness variation to match different architectural requirements.
Data Source
AI summary
A hip, ridge or rake shingle comprised of a plurality of panels sandwiched on each panel portion side of a layer of shingle material, such that each panel portion can be folded along a fold line, and wherein tabs are provided for each panel portion, adapted to be bent backwardly upon themselves, sandwiching thickening panels therebetween. The shingles can be laid up on a hip, ridge or rake of a roof, to yield desirable thickened features.