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DELTA-Grundmauerschutz, Drainage und Abdichtung

DELTA®-MS 20 - Tunnel Bottom Application

Its high drainage capacity enables DELTA®-MS 20 to meet all requirements for occurring water problems on tunnel construction projects.


With its 20 mm studs and very high drainage capacity, DELTA®-MS 20 is suited for use as a high performance seepage and drainage layer in tunneling and other double-shell horizontal or vertical constructions.


Studded membrane made of special, high-density polyethylene.


When laid horizontally on the bottom: Laid between the base slab and carriageway surface, DELTA®-MS 20 effectively drains away any water and channels it to the drainage pipe.

Technical Data

Product name DELTA®-MS 20
Color chocolate brown
Material Recycled high-density polyethylene, encapsulated between two layers of special virgin HDPE
Dimple height approx. 3/4" (20 mm) ASTM D6364-06
Compressive strength

apprx. 4,270 psf (200 kN/m²)

ASTM D6364-06
Fire resistance


B1 available upon request

Flow rate / unit width @ Hydr. grad. 1.0; 100 kPa 41.8 gal/min/ft (528 l/min/m) ASTM D4716-08
Flow rate / unit width @ Hydr. grad. 0.1; 100 kPa 11.2 gal/min/ft (139 l/min/m) ASTM D4716-08
Flow rate / unit width @ Hydr. grad. 0.02; 100 kPa 5.0 gal/min/ft (62.2 l/min/m) ASTM D4716-08
Air-gap volume between dimples approx. 14 l/m²
Water Penetration Resistance > 120 psi (815 kPa)

AATCC 127-1995

Water Vapor Transmission < 22 ng/(Pa s m²)

ASTM E96, Meth. A

Vapor permeance < 0.3 perms [grains/h/ft²/in Hg]

ASTM E96, Meth. A

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

Roll length

65' 7" (20 m)

Roll width

6' 6" (2 m)

Service life expectancy

> 25 years (at pH between 4 and 9, and temperature below 25°C). Do not expose to UV light for longer than 30 days.


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


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