Recycled Cover Board Composite for Roof Impact and Uplift Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercial low slope roofs face challenges in finding a cover board that provides impact protection, temporary water resistance, wind uplift resistance, thermal dimensional stability, and flexibility, while also being receptive to adhesives and mechanical fasteners, and easily installable, especially in re-roofing applications with curved contours.
Innovation Solution
A three-layered cover board composite with a top surface layer of fiberglass web, a bottom surface layer of paper or fiberglass web, and a core layer of discrete paper and polypropylene fragments bonded by a thermoplastic resin, offering improved mechanical flexibility and resistance to compression, wind uplift, and adhesives, and made from recycled materials for sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-density foam is used for thermal insulation, then thermal barrier requirements are achieved, but compressive strength and impact resistance deteriorate
Solution Approach 1:
The roof assembly is segmented into distinct functional layers: the insulating foam layer provides thermal insulation, while a separate cover board layer provides compressive strength and impact protection. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The cover board is constructed as a composite material system combining organic fibers (recycled paper, wood fibers) with inorganic binders (cement, gypsum, or clay). This composite structure provides both the thermal insulation requirements and the necessary compressive strength, while also offering fire resistance and impact protection.
2Strength
If conventional cover boards are used for protection, then compressive strength is provided, but flexibility and ease of installation on curved contours deteriorate
Solution Approach 1:
The cover board achieves flexibility by controlling its density and composition parameters. By using a mixture of organic fibers and inorganic binders in specific proportions, the board attains sufficient flexibility to conform to curved roof contours while maintaining adequate compressive strength through the reinforcement layers and binder matrix.
3Loss of substance
If recycled materials are used for sustainability, then environmental benefits are achieved, but manufacturing precision and consistency deteriorate
Solution Approach 1:
The cover board incorporates localized reinforcement layers strategically positioned within the composite structure. These reinforcement zones compensate for variability in the recycled fiber content, ensuring consistent mechanical properties and manufacturing precision across different batches while maintaining high recycled material usage.
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
The cover board provides enhanced resistance to hail impact, mechanical flexibility, and rapid installation, effectively addressing the challenges of existing cover boards by offering superior performance in low slope roofing assemblies, particularly in re-roofing applications, and promoting recyclability by using waste-derived materials.
Implementation Method 1
a core layer of discrete paper and polypropylene fragments bonded by a thermoplastic resin
Data Source
AI summary
Disclosed herein is a method of manufacturing an improved cover board product with a panel. In some embodiments, the method includes preparing fragments into an assembly; mixing the fragments and an adhesive into a blended core furnish; applying the adhesive to a top side of a bottom layer fabric in the assembly; forming a core mat of the blended core furnish on top of the adhesive; applying the adhesive to a top side of the core mat; applying a surface layer fabric on the top side of the adhesive; pressing the assembly; and cutting and trimming the assembly to form panels.