Cement Board Wall System with Drainage Channels
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Solution Overview
Problem
Existing exterior wall board systems are susceptible to water and moisture intrusion, leading to damage and corrosion, and lack sufficient shear strength, with complications and waste in their construction processes.
Innovation Solution
A cement wall board system that integrates drainage channels with structural cement boards, eliminating the need for wood-based sheathing and organic water-resistive barriers, using a fluid-applied water-resistive barrier and cement-compatible adhesive to form drainage channels between cement boards for water management and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wood-based sheathing and organic water-resistive barriers are used, then the system is easier to manufacture and install, but the system becomes susceptible to water damage and corrosion
Solution Approach 1:
The patent removes wood-based sheathing and organic water-resistive barriers from the wall system, extracting the components that are susceptible to water damage and corrosion. This eliminates the vulnerability to water intrusion while maintaining the structural and protective functions through alternative materials.
Solution Approach 2:
The patent employs composite materials including cement-based sheathing and inorganic water-resistive barriers that combine resistance to water, moisture, and corrosion. These composite materials provide enhanced durability and reliability by integrating multiple protective properties into a single system.
2Reliability
If cement board system with drainage channels is used, then water damage prevention is improved, but the system complexity increases
Solution Approach 1:
The patent combines the drainage channel formation with the adhesive application process. The adhesive is applied in a manner that simultaneously bonds the cement board and creates drainage channels, merging two functions into a single operational step and reducing overall system complexity.
Solution Approach 2:
The drainage channels are formed automatically through the adhesive application process itself, without requiring separate drilling or channel-creating steps. The adhesive placement pattern self-generates the drainage pathways, allowing the system to create its own water management infrastructure during installation.
3Object-affected harmful factors
If traditional multi-layer stucco system is used, then water-resistive protection is achieved, but construction time and material waste increase
Solution Approach 1:
The patent extracts and eliminates multiple traditional stucco layers (scratch coat, brown coat, finish coat) and associated materials (wire lath, building paper) from the wall system. This streamlines the construction process by reducing the number of sequential steps and material applications required to achieve water-resistive protection.
Solution Approach 2:
The cement board and adhesive system perform multiple functions simultaneously: providing structural support, creating drainage channels for water management, and serving as a substrate for finishing materials. This multi-functionality consolidates several traditional layers into a more efficient integrated system.
4Ease of operation
If wood-based sheathing and organic barriers are used, then installation is simpler, but material waste and cleanup burden increase
Solution Approach 1:
The patent uses cement-based composite materials that are more durable and generate less waste during installation and over time. These materials reduce the need for replacement and minimize debris requiring cleanup, addressing the waste issue while maintaining ease of installation through standardized components.
Data Source
AI summary
A system comprising an inner cement wall board, an outer cement wall board, and a cement or concrete compatible adhesive formed between the fluid-applied water-resistive barrier and the outer cement wall board, wherein the cement or concrete compatible adhesive forms drainage channels between the inner cement wall board and the outer cement wall board.