Anti-Telescoping Building Envelope Material with Partial Liner
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Solution Overview
Problem
Existing roof underlayment and house wrapping materials are prone to telescoping during application, lack dimensional stability, and fail to seal nail holes effectively, while also being adhesive to themselves and other layers, which leads to uneven application and water infiltration issues.
Innovation Solution
A multi-layer building envelope material with a substrate facestock, an adhesive layer, and a partial liner that exposes specific areas of the adhesive to prevent telescoping and ensure non-adhesion during rolling, allowing for easy application and effective sealing of nail holes without sticking to itself or other layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If building envelope materials are applied in rolled form with full adhesive coverage, then they provide complete sealing and weather resistance, but they telescope during handling and application
Solution Approach 1:
The adhesive layer is segmented by incorporating a liner that covers only specific portions of the adhesive, creating distinct adhesive-exposed zones and adhesive-covered zones. This segmentation allows the material to be applied in a controlled manner, preventing telescoping while maintaining sealing effectiveness at critical areas.
Solution Approach 2:
Different portions of the building envelope material have different adhesive properties. The liner creates local variations where adhesive is exposed in some areas (for controlled bonding) and covered in others (for telescoping prevention). This local quality differentiation resolves the contradiction between complete sealing and ease of application.
2Reliability
If building envelope materials use full adhesive coverage, then they ensure complete bonding and weather resistance, but they adhere to themselves during rolling and storage
Solution Approach 1:
The liner is extracted or removed from specific portions of the adhesive layer, exposing adhesive only where needed for bonding. This selective extraction prevents the material from adhering to itself during rolling and storage, while still providing complete bonding at the application site through the exposed adhesive zones.
Solution Approach 2:
The liner acts as an intermediary between the adhesive layer and the environment during storage and handling. It prevents premature adhesion by mediating the interaction between adhesive surfaces, allowing easy handling while maintaining bonding capability for eventual application.
3Ease of manufacture
If traditional tar paper is used as underlayment, then it provides low cost and basic coverage, but it absorbs water, wrinkles, expands, and fails to seal nail holes
Solution Approach 1:
The building envelope material uses a composite structure combining a substrate layer with an adhesive layer and a liner. This composite design integrates the benefits of different materials: the substrate provides structural integrity, the adhesive provides bonding and sealing (including nail hole sealing), and the liner provides controlled adhesion properties. This composite approach overcomes the limitations of traditional single-material tar paper.
Solution Approach 2:
The material properties are changed from traditional tar paper by introducing synthetic polymers and controlled adhesive formulations. These parameter changes include water resistance, dimensional stability, and controlled adhesion, while maintaining cost effectiveness through efficient material usage and simplified application processes.
4Stability of the object's composition
If building envelope materials are made dimensionally stable, then they resist tearing and maintain shape, but they lack the flexibility to cold flow and elongate to seal punctures
Solution Approach 1:
The adhesive layer provides dynamic properties that allow the material to adapt to substrate irregularities. The adhesive can flow and conform to nail holes and punctures, providing sealing flexibility, while the substrate maintains dimensional stability. This dynamic behavior of the adhesive component resolves the contradiction between stability and adaptability.
Solution Approach 2:
The adhesive is applied in advance to the substrate and allowed to flow and seal punctures before the final covering layer is applied. This preliminary action of the adhesive provides sealing flexibility and adaptability, while the subsequent substrate layer maintains dimensional stability and resistance to tearing.
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 prevents telescoping, ensures dimensional stability, and provides effective sealing of nail holes and vapor permeability, while maintaining non-adhesive properties during application, thus enhancing the installation process and preventing water infiltration.
Implementation Method 1
an adhesive layer overlying to the substrate facestock
Implementation Method 2
water vapor may pass through relatively freely to avoid problems of dampness or condensation
Data Source
AI summary
A building envelope material is comprised of multiple layers, the layers include a substrate facestock, an adhesive layer, and a liner, the liner does not cover the entire surface of the adhesive in efforts to eliminate telescoping when the building envelope material is in a roll form. The removed portion of the liner may include straight coating removals or pattern coating removals.