Self-adhering Drainage Wrap with Spacer Elements
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Solution Overview
Problem
Moisture penetration into building structures, such as walls and roofs, leads to premature deterioration and mold growth due to the inability of existing systems to effectively manage and drain moisture behind exterior cladding.
Innovation Solution
A self-adhering drainage-promoting wrap with a flexible weather-resistive membrane, spacer elements, and a vapor-permeable adhesive is applied between the inner sheathing and exterior cladding, creating drainage passageways and an open air space to facilitate moisture drainage and evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water resistive covering is applied over inner sheathing members, then moisture penetration into the building structure is reduced, but moisture that does penetrate accumulates behind the cladding causing deterioration and mold growth
Solution Approach 1:
The wrap is segmented into multiple functional layers: a water-resistive membrane layer for blocking moisture penetration, and a separate drainage layer with channels for directing moisture flow. This segmentation allows the system to simultaneously protect against moisture entry while providing a pathway for any penetrated moisture to drain, resolving the contradiction between moisture protection and structure durability.
Solution Approach 2:
The drainage wrap acts as an intermediary layer between the water-resistive covering and the building structure. It mediates the moisture management function by capturing penetrated moisture and directing it through drainage channels to designated exit points, preventing accumulation that would cause deterioration and mold growth while maintaining the protective function of the outer covering.
2Object-affected harmful factors
If an openwork drainage material is applied over the water resistive covering, then drainage passageways are created to prevent moisture accumulation, but the complexity of the building envelope assembly increases
Solution Approach 1:
The patent merges multiple functions into a single integrated wrap assembly: the water-resistive membrane function, the drainage channel function, and the vapor permeable function are combined in one multi-layer structure. This eliminates the need for separate drainage materials and multiple installation steps, reducing assembly complexity while maintaining effective moisture accumulation prevention.
Solution Approach 2:
The drainage wrap is designed as a universal multi-functional component that simultaneously provides moisture barrier protection, drainage capability, and vapor permeability. This multi-functionality allows a single product to replace multiple separate building envelope components, simplifying the overall assembly while effectively preventing moisture accumulation.
3Strength
If a continuous layer of adhesive is applied to secure the wrap, then bonding strength is improved, but vapor permeability may be compromised
Solution Approach 1:
The adhesive layer is designed with local quality variations: it provides continuous bonding coverage for secure attachment to the sheathing, while incorporating vapor permeable properties in specific regions or at controlled levels to allow moisture vapor transmission. This localized differentiation resolves the contradiction between bonding strength and vapor permeability by optimizing each property where needed.
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 solution effectively prevents moisture accumulation, reduces the risk of mold growth, and enhances the sustainability and energy efficiency of building structures by allowing moisture to drain and evaporate, thereby protecting the inner sheathing from damage and improving the building envelope.
Implementation Method 1
the layer of adhesive may be a vapor permeable acrylic adhesive that extends continuously on the rear face of the membrane
Implementation Method 2
a series of separate, spaced-apart, spacer elements bonded to the front face of the membrane and projecting therefrom to a predetermined height... creating drainage passageways and an open air space... to facilitate moisture drainage and evaporation
Data Source
AI summary
A self-adhering drainage-promoting wrap for a building structure includes an elongate, flexible strip of weather-resistive membrane having front and rear faces, a series of separate, spaced-apart, spacer elements bonded to the front face of the membrane and projecting therefrom to a predetermined height, and a layer of adhesive on the rear face of the membrane. Wall and roof assemblies including the self-adhering drainage-promoting wrap are also provided.