Sprayable Functional Layer for Building Envelope
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Solution Overview
Problem
Existing methods for applying functional layers to building envelopes, particularly on roofs, are time-consuming and prone to damage due to mechanical, chemical, and physical stress, especially in geometrically complex areas like rafter fields, where traditional composite films and adhesives like tapes fail to adhere well to damp or dusty surfaces.
Innovation Solution
A sprayable or brushable plastic film with specific additives, referred to as the 'spray film,' which can be applied quickly and securely to various surfaces, including damp ones, without the need for special fasteners, and can be used in conjunction with or as a replacement for traditional composite films in difficult-to-reach areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional composite films and adhesive tapes are used to protect building envelopes, then waterproofness and vapor barrier properties are achieved, but application time increases and adhesion fails on damp or dusty surfaces
Solution Approach 1:
The patent replaces mechanical adhesion systems (adhesive tapes requiring surface preparation and mechanical pressing) with a sprayable liquid film system. The liquid film is applied by spraying onto the surface, where it naturally adheres and forms a continuous protective layer without requiring mechanical fastening or surface drying, thus eliminating the time loss associated with surface preparation and mechanical application while maintaining reliable adhesion on damp or dusty surfaces.
Solution Approach 2:
The patent changes the physical state of the protective film from solid (adhesive tape) to liquid (sprayable film). This parameter change allows the film to be applied in liquid form that can penetrate and adhere to damp or dusty surfaces, then dries or cures to form the required protective barrier. The liquid state enables coverage of complex geometries and difficult-to-reach areas without requiring surface preparation, significantly reducing application time while maintaining adhesion reliability.
2Ease of manufacture
If adhesive tapes are used to seal building composite films, then connections are achieved, but application becomes difficult on damp or dusty surfaces and time-consuming
Solution Approach 1:
The patent replaces the mechanical adhesive tape system with a sprayable liquid film system. The liquid film is sprayed directly onto the areas requiring sealing, where it flows to cover the surface and adheres naturally without requiring mechanical pressing or alignment. This eliminates the time-consuming steps of tape measurement, cutting, positioning, and pressing, while the liquid formulation ensures easy application on damp or dusty surfaces that would prevent tape adhesion.
Solution Approach 2:
The sprayable liquid film enables continuous application across the surface without the interruptions required by tape application (alignment, pressing, trimming). The liquid can be sprayed continuously over complex geometries and difficult-to-reach areas, maintaining a continuous flow of application action. This continuity eliminates the start-stop nature of tape application, significantly reducing sealing time while improving ease of application on challenging surfaces.
3Reliability
If building composite films are laid in rafter fields, then protection against external influencing factors is achieved, but connection to formwork becomes difficult and time-consuming
Solution Approach 1:
The patent replaces the mechanical film-laying and fastening system with a sprayable liquid film system. The liquid film is sprayed directly onto the formwork and rafter field areas, where it adheres to the formwork and creates the required protective barrier. This eliminates the difficulty of mechanically connecting films to formwork in hard-to-reach rafter fields, as the liquid spray naturally coats all surfaces including vertical and angled formwork surfaces without requiring manual positioning or fastening.
Solution Approach 2:
The patent transitions from applying protective film in a two-dimensional plane (laying sheets on horizontal surfaces) to three-dimensional spray coverage (atomized liquid reaching all surfaces including vertical and angled areas). The spray application method delivers the protective film in all directions, ensuring complete coverage of the formwork and rafter field connections that are difficult to access, thereby improving ease of operation while maintaining reliable protection against water and vapor.
4Reliability
If traditional film laying methods are used in geometrically complex areas, then coverage is achieved, but application becomes time-consuming and prone to damage
Solution Approach 1:
The patent replaces the mechanical film-laying system with a sprayable liquid film system. The liquid spray can rapidly cover geometrically complex areas including vertical surfaces, angled surfaces, and difficult-to-reach corners without requiring manual positioning or manipulation. This dramatically increases application speed while the liquid formulation ensures complete coverage and proper adhesion to all surfaces, maintaining the required watertightness and airtightness that would be difficult to achieve with traditional mechanical methods in such complex geometries.
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 spray film significantly reduces application time, enhances adhesion and water resistance, and maintains structural integrity, achieving airtightness and vapor barrier properties while being flexible and resistant to UV, heat, and moisture, thus simplifying the installation process and improving the durability of the building envelope.
Implementation Method 1
By choosing the appropriate material for the spray film, it can be ensured that it adheres securely to the outside of the formwork, meaning that special fasteners are not necessary.
Implementation Method 2
a film applied by spraying and/or brushing, which is easy to apply
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
The invention relates to a method for producing a functional layer of a building envelope (2). According to the invention, it is provided that the functional layer is applied at least in certain areas to the outside (15) of the formwork (11) by brushing and/or spraying and forms an airtight and/or watertight film (10) as a vapor barrier after application.