Drainable Weather Resistive Barrier with 3D Meltblown Layer
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Solution Overview
Problem
Existing weather resistive barriers face challenges in providing effective multidirectional drainage, are prone to damage during installation, and are often expensive, limiting their application to vertical surfaces and increasing labor costs.
Innovation Solution
A drainage promoting fabric with a three-dimensional, non-uniform or non-continuous meltblown layer on a weather resistive barrier, comprising meltblown shot and ropes, offering high drainage efficiency, durability, and versatility for various installation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional weather resistive barriers with single-direction ridges and channels are used, then water drainage is effective in vertical applications, but they cannot be used in non-vertical applications such as gable ends or angular installations
Solution Approach 1:
The patent transitions from two-dimensional planar drainage structures to three-dimensional protruding ridge structures that extend perpendicular to the barrier surface. This dimensional change enables water to drain in multiple directions simultaneously, allowing the barrier to function effectively on vertical walls, horizontal roofs, and angular surfaces like gable ends without requiring different product configurations.
Solution Approach 2:
The weather resistive barrier is designed with three-dimensional ridges and channels that provide multidirectional drainage capability, making it universally applicable to various surface orientations including vertical walls, horizontal roofs, and angular installations. This multi-functional design eliminates the need for different barrier types for different applications.
2Ease of operation
If compressible weather resistive barriers are used to enable installation on various surfaces, then installation flexibility is improved, but the barriers are susceptible to being crushed during installation
Solution Approach 1:
The weather resistive barrier employs a flexible membrane structure that can conform to various surface geometries during installation while maintaining its functional integrity. The flexibility is achieved through the thin-film construction that bends and adapts to different angles and contours without crushing or permanent deformation, enabling reliable performance across vertical, horizontal, and angular applications.
3Ease of manufacture
If rigid polymer line segments are used to provide drainage, then drainage function is achieved, but the barriers are manufactured in narrow widths, are very expensive, and require adhesion to a second weather resistive barrier
Solution Approach 1:
The patent integrates the drainage ridges and channels directly into the weather resistive barrier membrane itself, combining what were previously separate components (rigid polymer drainage elements and the barrier material) into a single unified structure. This eliminates the need for adhesion to a second barrier and allows manufacturing in standard wide widths, reducing both material and installation complexity.
Solution Approach 2:
The weather resistive barrier is designed as a single comprehensive solution that provides both weather protection and multidirectional drainage functions in one product, eliminating the need for additional separate drainage barriers or adhesion layers. This universal design simplifies both manufacturing and installation processes.
Data Source
AI summary
Drainage promoting fabrics having commercial applications (e.g., housewrap) are provided. The drainage promoting fabric, according to certain embodiments of the invention, includes a weather resistive barrier having an outer surface, and a three-dimensional, non-uniform or non-continuous meltblown layer positioned on the outer surface of the weather resistive barrier. The meltblown layer may comprise meltblown shot, meltblown ropes, or both.