Pipes, Drainage & Ducting

GeoDrain GEO 8-250 – Drainage Board with Geotextile for Retaining Walls (8 mm, 250 kN/m²)

Drainage, protection and filtration in a single sheet. CR GEO 8-250 heat-bonds a 100 g/m² PP filtration geotextile to an 8mm HDPE dimple core, so the filter layer arrives already fixed, already aligned and already overlapping correctly. That removes an entire installation step from the wall - no separate geotextile roll, no independent overlap detailing, no risk of the filter slumping behind the sheet during backfill. At 250 kN/m² it covers the mainstream basement and retaining wall market with strength in hand.

Specification-Matched Performance Classes - 8 mm / 250 kN/m², 10 mm / 400 kN/m² and 20 mm / 200 kN/m² configurations aligned to established South African civil and green-roof drainage requirements.

Bare Sheet or Integrated Geocomposite - Choose DS 8-600 for waterproofing protection and drainage-cavity applications, or GEO 8-250 / GEO 10-400 with factory-bonded PP filter geotextile where filtration and drainage are required together.

400 kN/m² Heavy-Duty Civil Drainage - GEO 10-400 combines a 10 mm drainage core with 400 kN/m² compressive resistance for basements, retaining structures, podiums, underground parking and demanding civil works. Its published flow capacity is 4.11 × 10⁻³ m²/s at 20 kPa, i = 1.

Purpose-Built Green Roof Drainage - GR 20/200 provides a 20 mm perforated profile, 200 kN/m² compressive strength, 6.0 L/m² water storage and 10.6 L/s·m drainage capacity for green roofs, planters and landscaped podiums

Designed for Waterproofing Protection - HDPE dimple cores create a defined drainage and separation layer that protects below-ground waterproofing from direct soil contact and backfill-related mechanical damage.

Overview

CR GEO 8-250 is a geocomposite drainage sheet combining an 8mm HDPE dimpled core with a 100 g/m2 polypropylene filtration geotextile heat-bonded to the outer face. The dimple core performs the drainage and protection role. The geotextile prevents soil fines migrating into the drainage cavity and progressively blinding it. Together they deliver in one product what would otherwise be two separate materials and two separate installation operations.

The value of the bonded construction is realised on site rather than on the datasheet. A separately laid filter fabric has to be positioned, tensioned, fixed and lapped independently of the sheet behind it, and every one of those steps is an opportunity for the fabric to slump, tear at a fixing or lose its overlap during backfill. Once soil reaches the drainage cavity through a failed overlap, the cavity silts up and the wall loses its drainage function permanently. Heat-bonding the geotextile to the core eliminates that failure mode by construction rather than by workmanship.

At approximately 250 kN/m2 compressive strength the sheet covers the mainstream basement, foundation and retaining wall market with strength in hand rather than at its limit. In-plane water flow capacity is 2.48 x 10-3 m2/s at unit hydraulic gradient under 20 kPa, and the bonded geotextile has a water permeability of 80 x 10-3 m/s, so the filter admits water considerably faster than the core needs to convey it. Tensile strength is MD 11 kN/m and CMD 9 kN/m.

Independently assessed durability is 50 years in natural soils between pH 4 and pH 9 at soil temperatures below 25 degrees Celsius, with CE certification to DIN EN 13252 and Class E reaction to fire. The sheet must be covered within two weeks of installation to protect it from UV exposure. Supplied in 2m x 20m rolls and installed dimples toward the structure, geotextile facing the soil, with a minimum 100mm overlap at all sheet edges. Fixed with GeoDrain MP sealing buttons or MP screws into insulation, and terminated at the top edge with MP Profil PVC or aluminium closure strip.

MaterialHDPE dimple core + PP filtration geotextile
Structure8mm dimpled core with heat-bonded PP geotextile
ColourBlack core with grey geotextile
StandardCE to DIN EN 13252 · Class E fire · 50-year durability
Roll Width2.0 m (±0.05 m)
Roll Length20 m (±0.2 m)

Typical Properties

Property	DS 8-600	GEO 8-250	GEO 10-400	GR 20/200
Type	Bare HDPE	Geocomposite	Geocomposite	Geocomposite
Dimple Height	8mm	8mm	10mm	20mm
Compressive Strength	250 kN/m²	250 kN/m²	400 kN/m²	200 kN/m²
Filter Layer	None	Bonded PP	Bonded PP	Separate PP
Roll / Sheet Width	2.0m	2.0m	2.0m	2.4m
Roll / Sheet Length	20m	20m	12.5m	20m
Perforated	No	No	No	Yes
Coverage	40 m²	40 m²	25 m²	48 m²
Water Storage	-	-	-	6.0 L/m²
Primary Application	Protection	Standard drainage	Heavy-duty drainage	Green roofs

Note: The above specifications represent the product family properties. Please refer to the product datasheet for individual SKU values.

Typical Applications

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Basement & Foundation Waterproofing Protection

GeoDrain DS 8-600 is an 8 mm, 250 kN/m² bare HDPE dimpled protection sheet for basement walls, foundations and below-ground waterproofing systems. Installed outside the waterproofing layer, it provides mechanical protection and creates a defined drainage and ventilation cavity between the structure and surrounding backfill. Specify where an integral filter geotextile is not required.

Retaining Wall & Below-Ground Drainage

GeoDrain GEO 8-250 combines an 8 mm, 250 kN/m² HDPE drainage core with bonded PP filter geotextile for retaining walls, basement walls and foundation drainage. The geotextile filters surrounding soil fines while allowing water to enter the drainage core and discharge toward the designed subsoil drainage system, combining filtration, drainage and waterproofing protection in one layer.

Deep Basement, Podium & Underground Structure Drainage

GeoDrain GEO 10-400 is the heavy-duty drainage geocomposite for deep basements, podium decks, underground parking, tunnels and demanding civil structures. The 10 mm HDPE drainage core provides 400 kN/m² compressive resistance with bonded PP filtration geotextile and published in-plane flow capacity of 4.11 × 10⁻³ m²/s at 20 kPa, i=1, providing drainage and filtration under higher imposed loads.

Green Roof, Planter & Podium Landscape Drainage

GeoDrain GR 20/200 is a perforated 20 mm HDPE drainage and water-storage board for extensive green roofs, roof gardens, planter boxes and landscaped podiums. The system provides 200 kN/m² compressive strength, 6.0 L/m² water storage and 10.6 L/s·m drainage capacity, retaining useful moisture within the planted build-up while allowing excess water to discharge toward roof outlets

Compatible Systems

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GeoDrain DS 8-600 – 8mm HDPE Dimpled Drainage & Protection Board, 250 kN/m²

Bare HDPE dimpled drainage and waterproofing protection sheet for basements, foundations, retaining walls and below-ground structures. The 8 mm profile and 250 kN/m² compressive class provide a continuous protection and drainage cavity between the waterproofing system and backfill where an integral filter geotextile is not required. A high-volume choice for basement waterproofing protection, foundation drainage and general civil construction.

GeoDrain GEO 8-250 – 8mm Geocomposite Drainage Board for Basements & Retaining Walls, 250 kN/m²

Geocomposite drainage sheet combining an 8 mm HDPE drainage core with bonded PP filter geotextile for filtration, drainage and waterproofing protection in one layer. Designed for retaining walls, basement walls, foundations, planter walls and other below-ground applications where soil fines must be filtered before water enters the drainage cavity. Specify GEO 8-250 where an integrated filter layer is required.

GeoDrain GEO 10-400 – 10mm Heavy-Duty Geocomposite Drainage Board, 400 kN/m²

High-performance geocomposite drainage sheet for deep basements, retaining structures, underground parking, podium decks, tunnels and demanding civil works. The 10 mm HDPE drainage core provides 400 kN/m² compressive resistance with a factory-bonded PP filter geotextile and published in-plane flow capacity of 4.11 × 10⁻³ m²/s at 20 kPa, i=1. Designed for projects requiring higher load resistance and drainage capacity than standard 8 mm systems

GeoDrain GR 20/200 – 20mm Green Roof Drainage & Water Storage Board, 200 kN/m²

Perforated HDPE green roof drainage board for extensive green roofs, roof gardens, planter boxes and landscaped podiums. The 20 mm reservoir profile combines 200 kN/m² compressive strength with 6.0 L/m² water storage and 10.6 L/s·m drainage capacity, retaining useful moisture within the planted build-up while allowing excess water to discharge to roof outlets. Supplied in 2.4 m × 20 m rolls.

Installation Guidance

Standard Method Statement

Substrate Preparation & Product Selection – Confirm the specified GeoDrain grade, compressive strength and filtration requirement before installation. Waterproofing membranes and concrete substrates must be sound, clean and free of sharp projections or debris that could damage the drainage core. Complete and inspect waterproofing before covering it. For horizontal applications, confirm designed falls, drainage outlets and discharge paths before laying the drainage board.

Vertical Installation & Overlaps – Install DS 8-600, GEO 8-250 or GEO 10-400 in the orientation shown on the approved project detail, with geocomposite filter geotextile facing the soil or backfill side. Secure sheets using fixings compatible with the substrate and waterproofing system, keeping penetrations above the waterproofed zone wherever practicable. Form continuous overlaps between adjacent sheets and ensure geotextile overlaps prevent soil fines entering the drainage core. Do not leave open joints, displaced fleece or exposed drainage edges.

Drainage Outlet & Backfilling – The drainage layer must terminate into a designed collection and discharge system such as a perforated subsoil drain, drainage channel or approved outlet. Maintain an uninterrupted drainage path at the base of walls and around penetrations. Backfill carefully to prevent displacement, puncture or crushing of the sheet, avoiding direct impact from large aggregate or compaction equipment. GEO 10-400 provides 400 kN/m² compressive resistance where higher imposed loads require a heavy-duty drainage geocomposite

Green Roof & Podium Installation – Install GR 20/200 horizontally over the completed waterproofing/protection build-up with the reservoir and perforation arrangement positioned in accordance with the approved green-roof detail. Maintain free drainage to roof outlets and perimeter channels and install a suitable filter geotextile above the board before placing growing medium where required. GR 20/200 provides a 20 mm profile, 200 kN/m² compressive strength, 6.0 L/m² water storage and 10.6 L/s·m drainage capacity

Quality Assurance & Testing

Field QA/QC Checklist

Delivery & Storage: Materials checked against the delivery note and conformance certificates, stored off the ground, covered from UV and kept clear of sharp objects and fuel.
Orientation: Dimples placed against the structure or soil as specified; filter fabric facing the backfill.
Laps & Fixing: Vertical and horizontal laps and fixing points to the manufacturer's guide; top edge closed with a finishing strip.
Drainage Outlet: Base connected to the drainage pipe or outlet; falls checked.
Backfill: Backfill placed in layers without tearing the fabric or crushing the board.

Manufacturing Standards

ISO 12958 in-plane flow capacity
Manufacturer installation guide
CE to DIN EN 13252 · Class E fire · 50-year durability

Documents

CATEGORY GUIDEPDF DOCUMENT

Product Selection Guide

Compare performance properties across the entire category hierarchy before specifying.

View guides

INSTALLATIONPDF DOCUMENT

Installation & Method Statement

Standard deployment procedures, installation specifications, and field application method statements.

QUALITY CHECKLISTREQUEST ON DEMAND

QA/QC Site Checklist

Field quality control procedures, inspection checklists, and testing standards to verify installation integrity.

TECHNICAL SPECREQUEST ON DEMAND

Technical Data Sheet (TDS)

Guaranteed minimum average roll values (MARV) and material testing properties.

ACCESSORIES GUIDEREQUEST ON DEMAND

Chemical Resistance / Accessories Guide

Chemical compatibility matrix and list of auxiliary materials needed for installation.

Projects Using GeoDrain GEO 8-250 – Drainage Board with Geotextile for Retaining Walls (8 mm, 250 kN/m²)

Case studies and reference projects for GeoDrain GEO 8-250 – Drainage Board with Geotextile for Retaining Walls (8 mm, 250 kN/m²) will be published shortly. Contact our technical team for reference projects across Africa.