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
Key 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 2400N 1.1m x 50m
Deckdrain 1200 (1200S/NW8) 12mm 1.25 2300N 1.1m x 50m
Deckdrain 2500 (2500S/NW20XUV) 25mm 4.30 4800N 915mm x 50m
Deckdrain 5000 (5000S/NW20XUV) 50mm 29.00 N/A 915mm x 25m / 50m
Deckdrain 400 (400S/NW8) 4mm Data on request 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: HDPE cuspated core bonded to non-woven geotextile
Thickness Range: 4mm to 50mm
Drainage Flow Rate:
700: 0.67 l/s/m
1200: 1.25 l/s/m
2500: 4.30 l/s/m
5000: 29.00 l/s/m
Puncture Resistance:
700: 2400N
1200: 2300N
2500: 4800N
UV-Stabilised Options: 2500 and 5000 grades
Roll Sizes:
1.1m x 50m (700, 1200, 400)
915mm x 50m (2500)
915mm x 25m or 50m (5000)
Installation: Rolled out over waterproofing membranes or structural deck, cut to fit. Fixing optional depending on gradient and structure.
Compressive Strength: Suitable for high-load installations
Service Life: Long-term performance in permanent works