Drainage Housewrap With 3D Embossed Bubbles
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Solution Overview
Problem
Conventional housewraps are ineffective in draining water due to flat surfaces that prevent water from flowing downward, leading to potential water damage and moisture issues, and existing textured wraps with porous materials can cause additional problems with water accumulation and adherence of flashing tapes.
Innovation Solution
A multi-layer housewrap with a nonwoven base web featuring a three-dimensional pattern of oval half-bubbles embossed on both sides, coated with a polymer and calcium carbonate mixture, and activated by mechanical stretching to create micropores, allowing for water drainage and breathability while ensuring a tight seal with flashing tapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat sheet housewrap is used, then water barrier function is provided, but water accumulates between the wrap and siding causing moisture problems
Solution Approach 1:
The patent transforms the flat two-dimensional housewrap surface into a three-dimensional structure with raised bumps that create drainage channels. This dimensional change allows water to flow down the channels behind the siding rather than accumulating flat against the wrap, resolving the contradiction between providing a water barrier and preventing water accumulation.
Solution Approach 2:
The housewrap surface is segmented into raised bump regions and channel regions. The raised bumps create discrete drainage pathways separated by the bumps themselves, allowing water to be directed along specific channels rather than spreading uniformly, which prevents accumulation while maintaining the barrier function.
2Ease of operation
If porous material bumps are used for drainage, then water drainage is enabled, but water accumulates in the porous material causing moisture issues
Solution Approach 1:
The patent removes the porous material from the bump structure, extracting the problematic water-absorbing property while retaining the drainage function. The bumps are made of non-porous material that directs water along the channels without absorbing or accumulating it, resolving the contradiction between enabling drainage and preventing water accumulation.
3Ease of operation
If porous mat surface is used, then drainage channels are formed, but flashing tape adhesion is compromised
Solution Approach 1:
The patent applies different properties to different locations: the channel regions provide drainage pathways while the raised bump surfaces provide a smooth, non-porous substrate for flashing tape adhesion. This local differentiation allows both drainage functionality and reliable tape sealing to coexist without compromising either function.
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 housewrap effectively drains water by gravity, prevents liquid water penetration, and allows air and moisture vapor transmission, while ensuring a secure seal with flashing tapes, reducing the risk of water damage and moisture issues.
Implementation Method 1
The coated base web is activated by mechanical stretching of the coated base web in order to create micropores in the coating on the base web
Implementation Method 2
The housewrap has a textured surface in the form of channels which allow water on the surface of the housewrap to drain down by gravity
Data Source
AI summary
A housewrap is a multi-layer drainage wrap. A nonwoven base web has a three-dimensional pattern embossed therein on one surface of the web. This embossed web is then extrusion coated with a polymer coating. The coating is extrusion-coated on to embossed side of the nonwoven base web. The nonwoven base web has the three-dimensionally embossed and coated side as its outward facing surface. The coated base web is then activated by stretching to provide moisture vapor permeance at a rate that allows a building to breathe. The result is a housewrap that is textured on both the inside and outside faces of the housewrap. The texture and weather resistive coating on exterior side facilitates both drainage of water off of the outside face of the housewrap and the circulation of air and moisture around and through the inside face of the housewrap and promotes a tighter seal and better adhesion to flashing tapes reducing further the points of entry for water into the structure.