Product Data Sheet Show all documents

Sika® Drain-850 Geo

Dimpled drainage and protective sheet with integral filtration layer

Sika® Drain-850 Geo is a high density polyethylene (HDPE), heavy duty drainage and protective sheet with 10 mm high dimples on the bottom layer and a bonded geotextile (PP) filtration layer on the top layer.

  • Very good drainage capacity
  • Very good mechanical resistance
  • Very good impact resistance
  • Resistant to aggressive media in natural ground water and soil
  • Suitable for contact with acidic (soft) water
  • Can be installed on damp and wet substrates
  • The Product forms a drainage channel in the space between the structural elements and the back-filling, soil or substrate to allow water to be drained away
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Product Data Sheet Show all documents

Usage

Sika® Drain-850 Geo is used for:
  • Preformed sheet and liquid applied membrane waterproofing systems
  • Sika® White Box concept for waterproofing retaining walls and heavy-duty roofs and podiums
Please note:
  • When used in combination with PVC waterproofing membranes, a separation layer (geotextile) must be used between the Product and the membrane
  • Maximum installation depth is 10 m
 

Advantages

  • Very good drainage capacity
  • Very good mechanical resistance
  • Very good impact resistance
  • Resistant to aggressive media in natural ground water and soil
  • Suitable for contact with acidic (soft) water
  • Can be installed on damp and wet substrates
  • The Product forms a drainage channel in the space between the structural elements and the back-filling, soil or substrate to allow water to be drained away

Packaging

Roll width

2.4 m

Roll length

12.5 m

Refer to the current price list for available packaging variations.

Colour

Top layer colour

White

Bottom layer colour

Brown or black

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • CE marking and declaration of performance based on EN 13252:2016 Geotextiles and geotextile-related products — Characteristics required for use in drainage systems — Filtration, separation and drainage (F + S + D)
Product Information

Shelf Life

5 years from date of production

Storage Conditions

The Product must be stored in original undamaged packaging in cool and dry conditions. It must be protected from direct sunlight, rain, snow and ice. Always refer to packaging.

Thickness

At 2 kPa

10.0 mm (± 1.0 mm)

Weight

120 g/m² (± 12 g/m²)
Technical Information

Resistance to Static Puncture

1.5 kN (- 0.5 kN)

(EN ISO 12236)

Tensile Strength

Longitudinal (MD)

12.0 kN/m (- 2.0 kN/m)

Transversal (CMD)

10.0 kN/m (- 2.0 kN/m)

Ambient Maximum Temperature of Liquids

+32 °C (water)

Drain flow capacity

Horizontal application at 20 kPa

(S/R, i = 0.04)

0.60 l/(m∙s) (- 0.12 l/(m∙s))

Vertical application at 20 kPa

(S/R, i = 1)

3.50 l/(m∙s) (- 0.70 l/(m∙s))

Vertical application at 20 kPa

(S/S, i = 1)

3.25 l/(m∙s) (- 0.90 l/(m∙s))

Resistance to dynamic perforation

33.0 mm (± 6.0 mm)

(EN ISO 13433)

Compression resistance

350 kN/m2 (± 70 kN/m2)

Water permeability

Normal to the plane

85.0 l/(m2s) (- 30.0 l/(m2s))

Opening size

90 μm (± 30 μm)

(EN ISO 12956)

Elongation at maximum tensile stress

Longitudinal (MD)

70 % (± 40 %)

Transversal (CMD)

70 % (± 40 %)

Application

Application Information

Ambient Air Temperature

Maximum

+55 °C

Minimum

-10 °C
Application steps

SUBSTRATE PREPARATION

Substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, coatings and loose friable materials.

APPLICATION

IMPORTANT

Strictly follow installation procedures

Strictly follow installation procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT

Exposure to UV or weathering

The Product is not resistant to permanent UV exposure or weathering.

  1. Contact Sika Technical Services for more information.

INSTALLATION METHOD:

The waterproofing membrane is installed by loose laying and mechanically-fastening.

Refer to the relevant Sika® application manual and installation instructions.

 

Documents

FAQ

What is Sika® Drain-850 Geo used for?

Sika® Drain-850 Geo is a drainage and protection sheet used to protect waterproofing membranes and manage water discharge in waterproofing systems.

Posted on: 26/06/2025
What types of waterproofing systems can Sika® Drain-850 Geo be used with?

It is designed for use as a protection and drainage with sheet and liquid applied membrane waterproofing systems in areas such as basements, retaining walls, tunnels and foundation walls.

Posted on: 26/06/2025
How does Sika® Drain-850 Geo work?

Sika® Drain-850 Geo consists of a dimpled drainage core with a non-woven geotextile filter fabric bonded to one side. The dimples create a drainage channel, while the filter fabric allows water to pass through while preventing soil particles from clogging the drainage layer.

Posted on: 26/06/2025
What are the key benefits of Sika® Drain-850 Geo?

Sika® Drain-850 Geo offers high drainage capacity and high mechanical and impact resistance. It features an integral filtration layer, is resistant to aggressive substances in groundwater and soil, and is suitable for contact with soft water, which can be aggressive to concrete. The product can be installed on damp or wet substrates, and it forms a drainage channel between structural elements and backfill, allowing water to drain away efficiently.

Posted on: 26/06/2025

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