Deckdrain is a high-strength, high-flow geocomposite drainage layer, specifically engineered to provide long-term protection and water management in podium decks, green roofs, bridge decks, and structural waterproofing applications. It offers a reliable and efficient drainage path while protecting waterproofing membranes from damage caused by water pressure, soil movement, and mechanical stress.

Manufactured from a cuspated high-density polyethylene (HDPE) core bonded to non-woven geotextile filters, Deckdrain quickly channels water away from horizontal surfaces, preventing water buildup and ensuring long-lasting structural integrity. The geotextile layer prevents the ingress of fine particles, maintaining high flow rates over time and avoiding clogging. Certain models in the range are UV-stabilised, increasing durability for exposed applications and extended service life.

Widely used by civil engineers, architects, contractors, local authorities, and roof system designers, Deckdrain is ideal for horizontal drainage under intensive green roofs, podium landscaping, blue-green infrastructure, and protected waterproofing membranes in commercial, public sector, and urban regeneration projects.

Applications
Podium decks and landscaped terraces
Green roofs (intensive and semi-intensive)
Bridge abutments and retaining structures
Tunnels, underpasses, and underground structures
Drainage protection for waterproofing systems
Urban infrastructure and local authority developments

Benefits
Provides consistent drainage under load – even at low gradients
Protects membranes from mechanical damage
High puncture resistance and structural integrity
Easy to cut, handle, and install on site
Available in a range of thicknesses and flow rates for tailored performance
UV-stabilised variants for long-term durability
Reduces hydrostatic pressure, improving roof longevity
Maintains flow capacity even under high compressive loads
Deckdrain is supplied in rolls and can be installed quickly by rolling over flat surfaces or fixing vertically with mechanical fasteners. Overlaps should be maintained according to specification to ensure continuous drainage and geotextile filtration.

Deckdrain Sizes & Flow Rate Specifications
Product Code - Thickness - Flow Rate (l/s/m) - Puncture Resistance - Roll Size
Deckdrain 700 - (700S/NW8) - 7mm - 0.67(l/s/m) - 2400N - 1.1m x 50m
Deckdrain 1200 - (1200S/NW8) - 12mm  - 1.25(l/s/m) - 2300N - 1.1m x 50m
Deckdrain 2500 - (2500S/NW20XUV) - 25mm  -4.30(l/s/m) - 4800N - 915mm x 50m
Deckdrain 5000  - (5000S/NW20XUV) - 50mm - 29.00(l/s/m) - N/A - 915mm x 25m / 50m
Deckdrain 400 - (400S/NW8) - 4mm - Data on request - 1.1m x 50m
Flow rates measured at HG = 0.1 and under 20kPa load, simulating horizontal roof drainage conditions.

Please Note: This product is dispatched directly from our trusted supplier’s warehouse. While we aim to keep product availability as accurate as possible, we do not have live stock control for these items. Availability is subject to change, and delivery can take up to 15 working days, depending on stock levels at the time of order.
Tracking information will be provided where available, but please note this is dependent on the supplier’s shipping process. If you have any questions about lead times or delivery, our team is happy to help before you place your order.

Material | Cuspated HDPE core bonded to non-woven geotextile

Thickness Range | 4mm to 50mm

Drainage Flow Rates |
– 700 (7mm): 0.67 l/s/m
– 1200 (12mm): 1.25 l/s/m
– 2500 (25mm): 4.30 l/s/m
– 5000 (50mm): 29.00 l/s/m
– 400 (4mm): Data on request

Puncture Resistance |
– 700: 2400N
– 1200: 2300N
– 2500: 4800N
– 5000: N/A

UV-Stabilised Options | 2500 and 5000

Roll Sizes |
– 1.1m x 50m (400, 700, 1200)
– 915mm x 50m (2500)
– 915mm x 25m or 50m (5000)

Installation | Rolled out on waterproofing layer; overlaps required. Cut and fix as needed.

Compressive Strength | Suitable for high-load applications

Use Cases | Green roofs, podiums, bridge decks, tunnels, SuDS, retaining walls, protected waterproofing

Service Life | Long-term durability in permanent works