Cavity-Wall Insect Barrier with Segmented Filtration
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Solution Overview
Problem
Existing devices in cavity-wall constructions are ineffective in preventing insects of effective size from entering buildings, despite preventing mortar and debris from blocking weep holes, which is a concern for structures like hospitals and restaurants.
Innovation Solution
A mortar-and-debris-catching device with a water-permeable body and a barrier material that allows water to pass while preventing mortar and debris, and includes a smaller opening size barrier material to block insects, which can be positioned over weep holes or within them, using materials like mesh or fabric with insect repellents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-permeable body with larger openings is used to allow water drainage, then water can pass through effectively, but insects can also enter the building
Solution Approach 1:
The device is segmented into two distinct layers: a water-permeable body for drainage and an insect barrier layer for pest prevention. Each layer performs its specific function independently, resolving the contradiction between allowing water through while blocking insects.
Solution Approach 2:
The device combines two different materials with complementary properties: a water-permeable body material that allows water flow and an insect barrier material that blocks insects. This composite structure enables both water drainage and insect prevention simultaneously.
2Object-affected harmful factors
If a barrier material with smaller opening size is used to block insects, then insects are prevented from entering, but mortar and debris may still block the weep holes
Solution Approach 1:
The protective function is segmented into two layers: the water-permeable body prevents mortar and debris from blocking weep holes, while the insect barrier material prevents insect intrusion. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The water-permeable body acts as an intermediary layer between the weep hole and the insect barrier material. It provides structural support and prevents debris accumulation, enabling the insect barrier to function effectively without being compromised by mortar or debris.
3Reliability
If traditional weep hole devices are used to prevent mortar blocking, then debris is kept out, but they lack the capability to prevent insect entry
Solution Approach 1:
The invention merges two previously separate functions into a single integrated device: debris protection and insect prevention. By combining the water-permeable body with the insect barrier material, the device simultaneously addresses both protection needs that were previously handled by separate systems.
Solution Approach 2:
The integrated device performs multiple functions: it protects against mortar and debris blockage while simultaneously preventing insect intrusion. This multi-functional design eliminates the need for separate devices and provides comprehensive protection for the weep holes.
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
Effectively prevents insects from entering buildings while allowing water to drain, addressing the issue of insect intrusion through cavity-wall constructions by using a dual-layered system that captures debris and insects of smaller sizes.
Implementation Method 1
a first water-permeable body that yields a first-average opening size that is large enough to permit water to pass therethrough, but small enough to substantially prevent mortar and other debris from passing therethrough
Implementation Method 2
a water-permeable material that is further adapted to act as a barrier to insects which are of an effective size that is smaller than the first-average opening size (for debris capture)
Data Source
AI summary
An improved device for use in a cavity-wall construction includes a water-permeable body yielding a first-average opening size that is large enough to permit water to pass therethrough, but small enough to substantially prevent mortar and other debris from passing therethrough. The device includes a water-permeable material likewise adapted to permit water to pass therethrough, but also forms a barrier to insects which are of an effective size that is much smaller than the first-average opening size.