Subsill Pressure Chambers Circuitous Water Path
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Solution Overview
Problem
Sills and subsills face challenges with air and water infiltration through weep holes and fastener penetrations, with weep flaps often forming imperfect seals and failing over time, leading to ineffective water and air barrier performance.
Innovation Solution
The introduction of pressure chambers within the subsill that route water and air through circuitous paths, combined with overflow chamber assemblies equipped with back-flow preventers and drain tubes, to enhance drainage and reduce infiltration, with the structure of these features primarily dependent on the subsill rather than the sill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If weep flaps are used to reduce water infiltration through weep holes, then water resistance is improved, but reliability deteriorates because weep flaps can form imperfect seals, get stuck open due to debris, and fail over time
Solution Approach 1:
The subsill is divided into multiple pressure chambers separated by partitions, creating a segmented system where water must pass through multiple controlled apertures rather than a single weep hole with a unreliable flap. This segmentation isolates defects and ensures continuous drainage path control.
Solution Approach 2:
Pressure chambers act as intermediary zones between the exterior and interior, forcing water to pass through controlled apertures in chamber walls rather than directly through weep holes. This intermediary structure provides reliable water control without depending on mechanical weep flaps.
2Productivity
If a direct drainage path is used from back to front of the subsill, then drainage efficiency is improved, but water infiltration resistance deteriorates because water can easily penetrate through the direct path
Solution Approach 1:
The drainage path is made circuitous rather than direct, with water forced to travel through multiple apertures in pressure chamber walls at different positions. This curved, indirect path increases resistance to water infiltration while maintaining drainage capability through gravity.
Solution Approach 2:
The drainage system transitions from a one-dimensional direct path to a multi-dimensional circuitous route through pressure chambers, requiring water to navigate through apertures positioned at different heights and locations, thereby increasing path length and resistance.
3Object-affected harmful factors
If pressure chambers with circuitous paths are introduced to improve water and air infiltration resistance, then infiltration resistance is improved, but device complexity increases due to multiple chambers and partitions
Solution Approach 1:
The subsill is segmented into multiple pressure chambers using vertical partitions, creating a modular structure that systematically controls air and water infiltration through each chamber while maintaining overall structural integrity and functionality.
Solution Approach 2:
The pressure chamber structure serves multiple functions simultaneously: it controls water drainage through circuitous paths, blocks air infiltration through pressure differential, and provides structural support for the sill assembly, thereby reducing the need for separate components.
4Reliability
If overflow chamber assemblies with back-flow preventers are added to enhance drainage capacity, then drainage reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
Overflow chamber assemblies are pre-positioned within the subsill structure with back-flow preventers already installed, enabling them to immediately activate when excess water reaches the trough, providing preliminary protection against overflow before water can cause damage.
Solution Approach 2:
The overflow chambers act as cushioning capacity built into the system, temporarily holding excess water that exceeds the normal drainage capacity of pressure chambers, and gradually releasing it through controlled back-flow preventers to prevent sudden overflow and damage.
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
This solution significantly improves the resistance to air and water penetration by lengthening the path for water and air, reducing pressure, and providing effective drainage through circuitous routes and overflow chambers, thereby enhancing the overall performance of the sill assembly.
Implementation Method 1
The inventor observed that he could slow water and air infiltration into the subsill, by lengthening the water and air path within a subsill, and thereby improve a sill assembly's resistance to air and water penetration. These pressure chambers can route water and air through apertures in the pressure chamber walls or partitions.
Implementation Method 2
Water typically is drained out by gravity from the back of the subsill to the front of the subsill through apertures in the front wall known as weep holes.
Implementation Method 3
A back-flow preventer such as a check valve or ball valve can be added to the exit port to prevent back flow of water from the drain into the subsill.
Data Source
AI summary
A subsill positioned at least partially under a sill in a sill assembly. The sill assembly positioned under a door or window. Two or more pressure chambers extend lengthwise between the subsill and sill. Pressure chambers can extend one behind another. The subsill can include a backstop with some of the pressure chambers extending lengthwise between the backstop and the sill. Apertures in the pressure chambers are positioned to force water to flow by a circuitous path.