Foundation Drainage Board With Crisscross Channels And Filter Fabric
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Solution Overview
Problem
Current drainage systems for building foundations face issues such as clogging due to sediment, damage from backfill settlement, and the need for a durable, water-proof, and insulative solution that prevents sediment from entering drainage channels while maintaining effective water flow.
Innovation Solution
A drainage system comprising a drainage board with crisscross channels and an attached filter fabric, where the filter fabric is folded to form a settling strip to prevent tearing and ensure long-term protection against soil clogging, and the system is designed to reduce hydrostatic pressure and maintain insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter fabric is used to prevent sediment from entering drainage channels, then the drainage system is protected from clogging, but the filter fabric may become disturbed, torn, or ripped away by backfill settlement
Solution Approach 1:
The filter fabric is folded back over the top surface of the drainage board during installation, creating a pre-positioned protective configuration. This preliminary action ensures the fabric is properly secured before backfill settlement occurs, preventing subsequent tearing or ripping while maintaining its clogging prevention function
Solution Approach 2:
The folded-back configuration of the filter fabric creates a cushioning effect that absorbs and distributes the forces from backfill settlement. This beforehand cushioning protects the fabric from concentrated stresses that would cause tearing, while maintaining the filter's integrity for preventing sediment entry
2Reliability
If dimple sheeting is used for water-proofing, then water is repelled and air gaps are formed for drainage, but the sheet may collapse or buckle under pressure from backfilled material
Solution Approach 1:
The system combines dimple sheeting with a rigid or semi-rigid drainage board substrate. This composite structure provides the water repulsion and air gap formation of the dimple sheeting while the board substrate resists collapse and buckling under backfill pressure, maintaining both functions under load
3Reliability
If spray liquids are applied to waterproof a foundation, then seamless self-flashing membranes are formed, but the membranes may blister or pinhole if surfaces are not clean and dry, and water may pool underground
Solution Approach 1:
The drainage board and filter fabric system provides a pre-formed physical barrier structure that does not require spray application. This eliminates the need for substrate preparation (cleaning and drying) and prevents the blistering and pinholing issues associated with spray membranes, while also preventing underground water pooling through the integrated drainage channels
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 system effectively directs water through channels without clogging, maintains insulation, and protects the waterproofing membrane from damage during backfill settlement, providing a durable and cost-effective solution for foundation drainage.
Implementation Method 1
a filter fabric attached to a rear side of the drainage board that covers at least a portion of a top side and the front side of the drainage board
Implementation Method 2
The channels provided within the panel are covered by a spin-bonded filter fabric that admits water but keeps soil out. The water enters through the filter fabric and then drains down one or more vertical channels in the panel
Implementation Method 3
Many products currently exist as below-grade insulation panels. Currently, some products exist that provide both insulation and drainage
Implementation Method 4
forming a portion of the filter fabric that is unattached from the drainage board into a settling strip
Data Source
AI summary
A drainage system to be installed against a foundation of a building. The drainage system includes a drainage board having a plurality of channels extending from a bottom side along a front face thereof, and a portion of filter fabric attached to a rear face of the drainage board that covers the front face of the drainage board. The plurality of channels comprise a plurality of left channels and a plurality of right channels that intersect to form a crisscross pattern.