High-Density Mineral Wool Wall with 3D Grid for Crack-Resistant Plaster
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Solution Overview
Problem
Existing exterior building wall coating techniques face challenges with heavy materials, moisture-related dimensional variations, and cracking issues due to the use of cement slabs and metal laths, particularly in wooden frame houses, where perfect dryness and protection from rain are required, leading to inefficiencies and increased costs.
Innovation Solution
A three-dimensional grid structure supported by mineral wool panels with a density of at least 40 kg/m³, which is elastic and non-dimensional varying with water or thermal shocks, allowing for the application of a conventional cement-based coating without joint treatment and accommodating structural movements, thereby reducing the risk of cracking and improving installation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cement plates or OSB plates are used to support plaster coating, then the coating can be applied, but the plates are heavy to handle (approximately 13kg/m²)
Solution Approach 1:
The invention changes the density parameter of the mineral wool from conventional low-density (flexible) wool to high-density wool with at least 40 kg/m³, making it rigid enough to support plaster coating directly without requiring heavy cement or OSB plates, thereby reducing the weight and handling difficulty while maintaining structural support capability
Solution Approach 2:
The invention uses a three-dimensional grid structure as an intermediary element that bridges the mineral wool and the plaster coating, providing mechanical support for the coating while allowing the lightweight wool to remain the primary insulation layer, eliminating the need for heavy intermediate plates
2Reliability
If cement-based coating is applied on cement slabs with high dimensional variation, then coating can be applied, but cracking occurs due to dimensional variations up to 2.5 mm/m with humidity
Solution Approach 1:
The invention changes the material parameter from conventional rigid cement slabs to elastic high-density mineral wool, which can accommodate dimensional variations through its elastic properties, thereby preventing stress concentration and cracking in the plaster coating while maintaining dimensional stability
Solution Approach 2:
The invention uses the elastic properties of mineral wool as a flexible intermediate layer that can deform to accommodate dimensional changes in the underlying structure, absorbing stresses that would otherwise transmit to the rigid plaster coating and cause cracking
3Adaptability or versatility
If light and flexible mineral wool is used for insulation, then cable and pipe passage is facilitated, but no coating can be applied directly on the wool requiring additional plaster support plates
Solution Approach 1:
The invention changes the density parameter of mineral wool to at least 40 kg/m³, transforming it from a flexible material that requires additional support structures to a rigid material that can directly support plaster coating, thereby eliminating the need for additional plates and simplifying the overall system
Solution Approach 2:
The invention creates a composite system combining high-density mineral wool with a three-dimensional grid structure, where the wool provides both insulation and structural support capabilities, eliminating the need for separate support plates while maintaining the ability to accommodate utilities
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 mineral wool panel with a three-dimensional grid structure provides a durable and crack-resistant coating solution, reducing material weight, eliminating the need for joint treatment, and enhancing the insulating and protective properties of the building structure, while allowing for quicker and more reliable application processes.
Implementation Method 1
The mineral wool interposed between the coating on the one hand and the structure of the building on the other, such as a load-bearing structure in a wooden frame or a support structure for the coating in OSB plates or cement fibers, all of which are liable to deform depending on atmospheric conditions, is sufficiently elastic to withstand all dimensional variations.
Implementation Method 2
A three-dimensional grid structure can be composed of a three-dimensional grid or of a two-dimensional grid and of a set of spacers along a third dimension.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The wall has a mineral wool panel (1) having density equal to 40 kilogram per cubic meter. The mineral wool panel is covered with a three-dimensional (3D) grid structure (2) used as a plaster substrate (3). The grid structure is maintained by fasteners e.g. screws (7), passing through the mineral wool panel. The grid structure is made of glass cloth and alkali-resistant metal, where thickness of the mineral wool panel is equal to 20 mm. The mineral wool panel and the grid structure are fixed on a bracing panel (4) e.g. wooden panel.