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DELTA®-DRAIN - for horizontal applications

DELTA®-DRAIN – for horizontal applications

DELTA®-DRAIN - Horizontal Application Drainage and protection system with high compressive strength for horizontal applications. DELTA®-DRAIN is versatile and can be applied under thin substrate layers and pavers, as well as in garden roof applications, i.e. extensive green roofs, where effective drainage is required.


DELTA®-DRAIN acts as a surface drainage course. The geotextile is thermally bonded to the dimpled core, and serves as a reliable filter medium to prevent the drainage core from clogging.

DELTA®-DRAIN is highly pressure-resistant, able to withstand pressures of up to 5200 psf (250kN/sqm). The membrane is absolutely rot-proof and acts as reliable drainage for radon and methane gas.


Dimpled membrane made of special high-density polyethylene and PP non-woven TYPAR® geotextile.

The high-density polyethylene drainage core with a specially designed dimple pattern provides high compressive strength and toughness, and an outstanding drainage capacity that makes it suitable for almost any horizontal application.

DELTA®-DRAIN is manufactured with an exclusive co-extrusion process, utilizing 60 % recycled High Density Polyethylene (HDPE) from municipal recycling programs in the middle, and two thin layers of a specific grade of virgin HDPE on the outside. We use this process, exclusive to the dimple sheet industry, due to our respect for nature and environmental protection, as well as our strong commitment to sustainability of our products.

The encapsulation of the recycled HDPE ensures that DELTA®-DRAIN is adequately protected against polymer degradation caused by oxidation and environmental influences like acidic soils or alkalinity (concrete).
DELTA®-DRAIN, equipped with highly effective additive packages, is stabilized against oxidation and provides outstanding compressive strength, impact resistance, and chemical and environmental stress crack resistance.


The product is easily unrolled on horizontal surfaces. Available in 6' and 8' wide rolls, DELTA®-DRAIN is offered as the largest size drainboard available on the market today, saving valuable time during installation.

Technical Data

Product name
Color drainage-core: brown; geotextile: gray

drainage-core: recycled & virgin high-density polyethylene

geotextile: polypropylene

Dimple height 5/16" (8mm) ASTM D6364-06
Compressive strength approx. 5,200 psf (250 kN/m²) ASTM D6364-06
Air-gap volume between dimples 0.13 gal/ft² (5.3 l/m²)
Water penetration resistance (core) > 120 psi (815 kPa)

AATCC 127-1995

Flow rate / unit width @ Hydr. grad. 0.1; 180 kPa

1.4 gal/min/ft (17.4 l/min/m)

ASTM D4716-08

Temperature range -22°F to +176°F (-30°C to +80°C)
Chemical properties Excellent chemical resistance, resistant to root-penetration, rot-proof
Toxicity non-toxic, non-polluting
Weight per unit area approx. 21.1 oz/yd² (715 g/m²) ASTM D5261-92 (2003)
Roll dimensions/Roll weight 6' x 65' 7" (1.83m x 20m) 60 lbs (27.2 kg)
8' x 65' 7" (2.45m x 20m) 73 lbs (33.1 kg)

Service life expectancy > 25 years (at pH between 4 and 9 and temperature below 25°C). The product should not be exposed to UV light for more than 30 days.

DELTA® is a registered trademark of Ewald Dörken AG, Herdecke, Germany.

More Information

System overview

Overview DELTA® Premium Moisture Protection System for Basements


Incorporate DELTA Products into your plans quickly and easily by downloading our design files from