HYDRODUCT® Horizontal Drainage & Irrigation Sheets

Creep resistant geocomposite drainage sheets, providing highly efficient drainage or irrigation to horizontal roofs and decks


HYDRODUCT® drainage sheets are pre-fabricated geocomposites comprising studded polystyrene drainage cores covered with polypropylene filter fabrics. Usually used in conjunction with GCP waterproofing membranes they provide efficient, cost effective drainage planes to horizontal roof and concrete deck surfaces to quickly route water into drainage outlets.

HYDRODUCT® drainage sheets should always be correctly linked with drainage outlets to ensure water is drained into the roof or deck drainage system.


  • Polystyrene has minimal creep under long term loading - drainage capacity maintained
  • Fully compatible with GCP waterproof membranes
  • Provides additional factors of safety against water penetration through roof decks
  • Range of filter fabrics to cover hard and soft landscaped finishes
  • Range of compressive strength cores to suit different loading and trafficking conditions
  • Provides an efficient, low cost drainage plane to horizontal roof decks
  • Geotextile filter fabrics prevent soil particles entering drainage core - minimises risk of clogging
  • Rot proof - unaffected by immersion in water and resistant to dilute concentrations of chemicals
  • Quick and easy to install - no site plant needed
  • HYDRODUCT® 401 and 501 provide both water discharge and retention functions for low and regular maintenance green roofs.

Product Range



Polypropylene non-woven filter fabric on one face of an 12 mm studded drainage core. For pedestrian and lightly trafficked roof decks. Can be applied to waterproof membranes that have been covered with protection boards.


Polypropylene non-woven filter fabric on one face of an 12 mm studded drainage core with a pressure dissipation plastic film bonded to the other face. For service reservoirs and other buried concrete structures. For service reservoirs only can be applied to BITUTHENE® 4000 without protection boards.



Polypropylene woven filter fabric on one face of an 12 mm high strength studded drainage core. For vehicular trafficked roof decks and where cementitious overlays are used.


Polypropylene non-woven filter fabric on one face of an 12 mm studded drainage core with a separation geotextile bonded to the other face. For low and regular maintenance green roofs and planter boxes with minimum falls of 1 in 80.


Polypropylene non-woven filter fabric on one face of a 26 mm studded drainage core with a separation geotextile bonded to the other face. For draining and irrigating, low and regular maintenance green roofs and planter boxes with falls of less than 1 in 80.

HYDRODUCT® Root Barrier

Heavy-duty polyethylene root barrier for green roofs and planter boxes.


  • Do not apply hot asphalt/bitumen to HYDRODUCT® products.
  • HYDRODUCT® products are not suitable for use with rubber or plastic paving slab supports.
  • At temperatures below 0°C, additional fixings are necessary to secure the geotextile to the drainage core. Contact GCP for further details.

Technical Data: HYDRODUCT®

  200 220 650 401 501 ROOT BARRIER
Core Thickness (mm) 12 12 12 12 26 0.8
Width (m) 1. 25 1. 25 1.25 1.25 1.25 6
Length (m) 32 32 32 32 20 25
Comprehensive strength (kN/m2) 700 700 900 700 500 -
Drainage flow at 2% gradient under load of 20 kN/2 (l/s/m) 0.60 0.60 0.72 0.68 2.14 -

Declared Values according to EN 13252:2000 + A1:2005

Resistance to static puncture (CBR test) (kN) > 1.26 > 3.1
Tensile strength (kN/m) MD: > 7 CMD: > 7 MD: > 7 CMD: > 7
Dynamic perforation resistance (cone drop test) (mm) > 26 > 8.8
Characteristic open size (μm) 100 ± 30 173 +33 / -88
Water permeability normal to the plane (ms) ≥ 0.063 ≥ 0.048
Water flow capacity in the plane (m2/s) ≥ 3.5 x 10-3 ≥ 3.8 x 10-3
Durability To be covered within 30 days. Predicted to be durable for a minimum of 25 years in natural soils with 4 < pH > 9 and soils temperatures < 25°C
Dangerous substances NPD

Exempt from EN 3252: 2000 + A1:2005

Applications: HYDRODUCT®

  200 220 650 401 501 ROOT BARRIER
Pedestrian deck/terrace          
Deck planter boxes      
Vehicle trafficked deck          
Intensive green roof      
Extensive green roof      
Service reservoirs and buried concrete structures          
Inverted roofs        


Installed on top of GCP waterproofing membranes and protection boards. HYDRODUCT® filter fabrics are bonded to the drainage core with pressure-sensitive glue which permits the fabric to be peeled back to form overlaps etc.

The glue can be softened if required using a hot air gun. Do not use an open flame since this will damage the fabric. The geotextile filter fabric is always laid towards the water face to allow water entry. The sheets can be joined by overlapping the geotextile fabric 100 mm and butt jointing the studded sheet at the flat selvedge. Cut Fasteners are then used to form a connector at centres to suit application by interlocking a minimum of two dimples on each sheet and reinstating the fabric to form a weathered lap.

Butt and Cut Jointing

Simple butt joints can be made by carefully separating the geotextile fabric and making a weathered overlap and fastening the joints using Cut Fasteners which interlock to form a connector at centres to suit application.


HYDRODUCT® can be generally bent on site to form internal corners. External corners are formed by cutting the dimpled sheets at corners and providing an additional 100 mm wide strip of the fabric to wrap around corner and overlap joint then bonding with BITUSTIK®.

Installation with drainage pipes

Cut studded core to suit drainage outlet. Slit geotextile and tuck under core to hold in place prior to installing or finishes.

Sealing edges

All exposed edges of HYDRODUCT® should have extra fabric tucked behind core to seal leading edge to prevent debris or silt from entering the core. Loose lay HYDRODUCT® Root Barrier (where necessary) to the waterproofing protection layer. Form a minimum 75 mm overlap at all joints. All laps in HYDRODUCT® Root Barrier should be fused welded with a 110 volt hot air gun. Ensure all laps are clean and dry. Wait until hot air gun temperature has stabilised and use off-cuts to test temperature and technique. Form weld by slowly moving gun along the lap and rolling the upper sheet with a small roller.Do not overheat the laps. Check weld strength and re-heat poorly welded areas


A variety of surface finishes can be laid directly on top of HYDRODUCT® drainage sheets, dependent on deck use. Contact GCP Technical Services for further guidance.

Health and Safety

There is no legal requirement for a Safety Data Sheet for the HYDRODUCT® range of products. For health and safety questions on these products please contact GCP Applied Technologies.

Alt Text


Grace Construction Products Ltd
Ipswich Road, Slough, Berkshire SL1 4EQ
United Kingdom
12 CPD-44
0799 EN 13252:2000 + A1:2005
HYDRODUCT® 200, HYDRODUCT® 220, HYDRODUCT® 401, HYDRODUCT® 501, HYDRODUCT® 650 Geotextile for filtration, separation and drainage (F+S+D) in drainage systems, Type F+S+D

gcpat.ae | United Arab Emirates customer service: +971 4 5139560

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement,recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

BITUTHENE, BITUSTIK, and HYDRODUCT are trademarks, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

© Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Alpharetta, GA 30009, USA
P. O. Box 5006, Office 2104, 21 Floor, The Exchange Tower, Opp. JW Marriott Marquis Hotel, Business Bay, Dubai – United Arab Emirates
This document is only current as of the last updated date stated below and is valid only for use in the UAE. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.ae. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2022-11-18