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DELTA®-MS Underslab

DELTA®-MS Underslab - Sub-Base Course & Vapor Retarder

DELTA®-MS Underslab For use as vapor retarder and sub-base course below concrete slabs.


When using DELTA®-MS as a sub-base course, you gain crucial advantages:
Protection of the floor slab from rising moisture, high compressive strength, minimum installation time, no equipment cost, and no additional excavation. DELTA®-MS resists acids, alkalines, oils, and solvents. Its toughness and stiffness enables the dimpled sheet to endure the traffic of installers and wheelbarrows.


DELTA®-MS UNDERSLAB 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, because we respect nature and for environmental protection, as well as our strong commitment to sustainability of our products.

The encapsulation of the recycled HDPE ensures that DELTA®-MS is adequately protected against polymer degradation caused by oxidation and environmental influences like acidic soils or alkalinity (concrete), which all-recycle based products are highly vulnerable to. In fact, it is virtually impossible to control the environmental stress crack resistance (ESCR) of HDPE membranes that are made entirely from recycled resin.

DELTA®-MS, equipped with highly effective additive packages, is stabilized against oxidation and provides outstanding compressive strength, impact resistance, chemical and environmental stress crack resistance. Tests performed by independent and accredited laboratories prove the unrivaled sustainability and long-term performance, and are available upon request.


Used as sub-base course, DELTA®-MS Underslab provides crucial advantages: Quick installation time, no equipment, no additional excavation. The product is available in many convenient roll sizes, making installation very easy.

Technical Data

Product name DELTA®-MS Underslab
Color chocolate brown
Material Recycled high-density polyethylene, encapsulated between two layers of special virgin HDPE
Dimple height apprx. 5/16" (8 mm) ASTM D6364-06
Compressive strength

apprx. 5,200 psf (250 kN/m²)

ASTM D6364-06
Fire resistance


B1 available upon request

DIN 4102
Flow rate / unit width @ Hydr. grad. 0.1; 100 kPa

3.0 gal/min/ft (37.5 l/min/m)

ASTM D4716-08
Air-gap volume between dimples apprx. 0.13 gal/ft² (5.3 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
Weight per unit area approx. 17.1 oz/yd² (580 g/m²) ASTM D5261-92 (2003)
Roll length 65' 7" (20 m)
Roll width/Roll weight 3' 6" (1.07 m) 28 lbs (12.7 kg
5' (1.52 m) 41 lbs (18.6 kg)
6' (1.83 m) 47 lbs (21.3 kg)
6' 7" (2.00 m) 51 lbs (23.1 kg)
7' (2.13 m) 55 lbs (24.9 kg)
8' (2.45 m) 63 lbs (28.6 kg)
9' 10" (3.00 m) 77 lbs (34.9 kg)
Service life expectancy

> 25 years (at pH between 4 and 9, and temperature below 25°C). The membrane 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

Product Video

Designing Spaces with DELTA®-MS