Drainage Sheet
Drainage Sheet
The drainage sheet is a professional drainage and protection system that ensures controlled water evacuation on foundation retaining walls, basement walls, terraces and other below-grade structural surfaces. It protects structures from water pressure, moisture and soil-related exposure, extending the life of waterproofing systems.
Product description
What Is a Drainage Sheet?
A drainage sheet is an HDPE-based protective drainage product that ensures controlled water evacuation in foundation and retaining wall waterproofing systems. Its dimpled structure creates an air gap between the structure and the soil, helping to channel water toward the drainage line.
It also shields waterproofing membranes from mechanical damage that can be caused by soil backfill, supporting long-term performance of the whole system.
Advantages of the Drainage Sheet
- Provides controlled water drainage
- Protects foundation retaining walls from moisture
- Shields the waterproofing membrane against mechanical impact
- Withstands soil pressure
- Offers a long service life
- Easy to install
- Helps the structure breathe
- Reduces mold and dampness
Areas of Use
- Foundation and retaining wall applications
- Basement walls
- Below-grade structural surfaces
- Terrace drainage systems
- Garden walls
- Applications over parking decks
- Tunnel and infrastructure projects
- Green roof systems
Types of Drainage Sheet
Standard Dimpled Drainage Sheet
A standard HDPE drainage sheet used in foundation and retaining wall applications.
Technical Features
- HDPE-based structure
- Dimpled surface
- High compressive strength
- Water drainage capability
Geotextile-Faced Drainage Sheet
A professional drainage solution whose filter fabric reduces the risk of the drainage line clogging.
Technical Features
- Geotextile filter layer
- Enhanced drainage performance
- Soil filtration
- Long service life
Technical Specifications
| Property | Description |
|---|---|
| Product Type | HDPE Drainage Sheet |
| Application Area | Foundations, retaining walls, basements, terraces |
| Surface Structure | Dimpled |
| Function | Water drainage and protection |
| Strength | Resistant to soil pressure |
| Installation Type | Mechanical fixing |
How Does a Drainage Sheet Work?
Its dimpled surface creates an air gap between the wall and the soil. Water that collects in this gap is channeled to the drainage line in a controlled manner, which prevents water pressure from building up against the structure.
At the same time, the drainage sheet protects waterproofing membranes from mechanical impact that can occur during backfilling.
Application Method
Once the waterproofing system on the surface is complete, the sheets are installed with the dimpled side facing outward.
The sheets are fixed to the retaining wall with mechanical anchors or fasteners. Laps should be made at joints, and drainage continuity must be maintained.
Technical Drawing Description
Foundation Retaining Wall Drainage System
- Reinforced concrete retaining wall
- Bituminous waterproofing membrane
- Drainage sheet
- Geotextile filter layer
- Drainage pipe
- Soil backfill
Technical Catalog
📄 You can review the catalog file for the product's technical details.
Gün Yalıtım Technical Catalog – Download PDF
FREQUENTLY ASKED QUESTIONS
What is a drainage sheet used for?
It provides controlled water drainage on foundations and retaining walls and protects the waterproofing system.
Does a drainage sheet let water through?
A drainage sheet allows water to pass and directs it to the drainage line. The goal is to move water away from the structure.
Where is a drainage sheet used?
It is used on foundation retaining walls, basement walls, terraces, green roofs and below-grade structural surfaces.
Does a drainage sheet protect the membrane?
Yes. It protects the membrane against mechanical impact that can be caused by soil backfill.
What advantage does a geotextile-faced drainage sheet offer?
Its filter fabric reduces clogging of the drainage system and makes water drainage more efficient.
