DELTA NP DRAIN – Geocomposite Drainage Sheet | Reliable Foundation Protection

DELTA NP DRAIN

DELTA®-NP DRAIN is a high-performance geocomposite drainage sheet designed to protect foundation walls and extend the service life of buildings. Its welded geotextile layer filters soil particles, preventing clogging of the studded structure and enabling controlled drainage of water toward drainage pipes.

Advantages

Dual Protection:
Creates an additional waterproof layer over the insulation system, providing protection against leakage and surface water.

Durable Protection:
Safeguards waterproofing systems against point loads and soil settlement pressure.

Compatibility:
Can be used together with all types of waterproofing systems.

Easy Installation:
The integrated self-adhesive overlap strip reduces installation errors and provides immediate watertight sealing.

Filtration Performance:
The PP geotextile layer filters soil particles, maintaining long-term drainage performance.

No Additional Gravel Layer Required:
Compliant with DIN 18195-4 and DIN 18195-6 standards; backfill materials can be applied directly.

Building Physics Solutions:
Helps prevent moisture and pressure-related problems in waterproof concrete structures.

Application Areas

Foundation Walls:
Provides vertical drainage by directing water away from the structure.

Underground Structures:
Protects basements and retaining walls against moisture and water pressure.

Green Roofs and Terraces:
Protects waterproofing layers and enables efficient drainage of excess water.

Landscaping Applications:
Creates a reliable drainage layer beneath soil surfaces.

Application Note:
The drainage sheet must be installed with the geotextile surface facing the soil. Water is filtered through the geotextile layer, passes through the studded structure and is transferred to drainage pipes.

Technical Data

Property	Value
Material	Brown HDPE studded sheet + welded PP geotextile
Stud Height	8 mm
Air Volume Between Studs	5.3 l/m²
Compressive Strength	~150 kN/m²
Drainage Capacity (20 kN/m²)	1.9 · 10⁻³ m²/s (EN ISO 12958)
Geotextile Water Permeability	8 · 10⁻² m/s (EN ISO 11058)
Tensile Strength	MD 11.9 / CMD 12.3 kN/m (EN ISO 10319)
Temperature Resistance	-30°C / +80°C
Roll Dimensions	20 m x 2 m
Durability	25 years (EN 13252 Annex B, under suitable soil conditions)

Why Choose DELTA®-NP DRAIN?

Protects waterproofing systems against water and mechanical impacts
Extends building life with long-lasting drainage performance
Provides easy installation and cost advantages
Eliminates the need for additional drainage materials thanks to DIN standard compliance

Frequently Asked Questions (FAQ)

1. What makes DELTA®-NP DRAIN different?

Its geotextile layer filters fine soil particles and prevents clogging, ensuring continuous drainage performance.

2. Is a gravel drainage layer required?

No. Thanks to its compliance with DIN 18195 standards, additional drainage gravel is not required.

3. How durable is DELTA®-NP DRAIN?

Under suitable soil conditions, it maintains its performance for up to 25 years without biological degradation.

4. Where can DELTA®-NP DRAIN be used?

It can be used for foundation walls, basements, retaining walls, green roofs and landscaping applications.

5. What should be considered during installation?

The geotextile surface must always face the soil side, and overlap joints should be properly sealed to ensure waterproof performance.

DELTA®-NP DRAIN is a reliable geocomposite drainage solution that ensures long-lasting drainage and waterproofing performance for modern construction projects.