Pre-fabricated geocomposite drain consisting of a studded polystyrene core covered with a nonwoven, needle punched polypropylene filter fabric and a smooth polymeric sheet
Hydroduct® 220 is a strong, preformed geocomposite drainage sheet system, comprising a hollow studded polystyrene core. This is covered on one side with a non-woven, needle punched polypropylene filter fabric and on the other side with a smooth polymeric sheet.
This drainage composite has been specially developed to provide a simple and highly practical collector and deflector of unwanted ground water and can be used with Bituthene® waterproof membranes. When installed it will minimise the build-up of percolated surface water against the structure or the waterproof membrane to increase the overall security and performance of the building structure. The construction of the studded sheet also creates an air void to isolate the structure from the effects of the surrounding ground.
An important feature of this system is that it can be used behind trench sheeting and other permanent shoring works to provide a sandwiched water collector/deflector layer to control infiltrated water.
Hydroduct 220 can also be used against existing structures or permanent works to allow Preprufe® membranes to be applied to the smooth polymeric sheet side of the drainage core in reverse tanking applications. Hydroduct 220 has been designed to withstand the ground pressures, compaction forces and wet concrete to provide a high water flow capacity of 3 litre/second/metre width. The drainage sheet must be connected into the site drainage system to minimise hydrostatic build-up and collect infiltrated water using perforated pipes wrapped and linked with the geotextile filter fabric to prevent clogging.
- Enhances waterproofing - relieves water pressure from the structure and waterproofing membrane and eliminates hydrostatic pressure build-up.
- Efficient water collector/deflector - can be used behind trench sheeting and other permanent shoring works as a sandwich drainage layer between the reinforced concrete structure.
- Smooth polymeric backing sheet - protects waterproofing membranes from damage caused by high lateral soil pressure in deep wall construction.
- Simple, convenient drainage layer - alleviates and controls ground water to prevent its entry into substructures and basements.
- Geotextile fabric filter - allows ground water to pass into the drain core while restricting the movement of soil particles.
- High flow capacity - drains 3 litre/sec/metre width.
- Rot proof - unaffected by permanent immersion in water, bacteria, dilute acids and alkalis.
- Economical - eliminates imported aggregate drainage layers.
- Studded core - allows water to flow to designated drainage collection points
Hydroduct 220 must be securely located in position against existing or new construction by fastening with masonry nails, shot fired or pneumatic fixings to support the weight of the sheet and Bituthene membrane. The centres of the fixings will be dependent on the height of the wall, substrate material and profile.The geotextile filter fabric is always laid towards the water face to allow water entry with the smooth polymeric sheet against or ready to receive the Bituthene membrane. The sheets can be joined horizontally and vertically by overlapping the geotextile fabric and butt jointing the studded sheet.
Butt and Cut Jointing
Simple vertical laps and butt joints can be made by separating the geotextile fabric and making a weathered overlap.
Hydroduct 220 can be bent on site to form internal corners. External corners are formed by cutting the dimpled sheets at corners and providing an additional 100mm wide strip of the filter fabric to wrap around corner to prevent infiltration of soil or debris at the overlap joint.
Installation with drainage pipes
Peel back geotextile fabric from studded core. Place drain pipe against core, wrap with fabric and tuck behind core. Place a small amount of soil on fabric to hold in place prior to backfilling.
All exposed edges of Hydroduct Sheet 220 should have extra fabric tucked behind core to seal leading edge to prevent soil from entering the core.
Use with Bituthene membranes
Bituthene self-adhesive membranes can be bonded to the smooth polymeric sheet without priming provided the surface is dry and clean. If joints in Hydroduct 220 are slightly out of alignment owing to irregularities of the substrate they should be overbanded with a 100mm wide strip of Bituthene before applying the overall membrane.
|Property||Test Method||Typical Value|
|Polymer||N/A||High Impact Polystyrene|
|Thickness||ASTM C 366-B||9.5mm|
|Compressive Strength||ASTM D 1621||718kPa|
|Flow Rate||ASTM D 4716||3.0 litre/sec/metre width (gradient 0.1, 37.9 kPa)|
|Property||Test Method||Typical Value|
|Weight||ASTM D 3776||136g / m2|
|Tensile Strength||ASTM D 4632||450N x 600N|
|Trapezoidal Tear||ASTM D 4533||222N|
|Apparent Opening Size||ASTM D 4751||0.150 to 0.212mm|
|Permittivity||ASTM D 4491||6095 Litre / min / m2|
1.22m x 15.25m long roll
|Storage||Keep under cover in original wrapping and cover immediately after installation.|
|Bitustik||150mm x 15.0m rolls|
|Bituthene Tape||50mm x 33m roll|
Equipment by Others
Hammer drill with 6mm diameter masonry drill. Hilti DX 36M cartridge gun and cartridge 6.8/11M calibre, Aerosmith pneumatic nailer, refer to manufacturer for type of fixing. Stanley knife for trimming.
Hydroduct 220 drainage system shall be placed, fixed and terminated at the correct position to suit the ground levels and installed in accordance with the manufacturer’s instructions and supplied by GCP Applied Technologies. For further information contact your local GCP representative.
Health and Safety
Refer to relevant Material Health and Safety data sheets.
For assistance with working drawings for projects and additional technical advice, please contact GCP Applied Technologies.
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Last Updated: 2020-04-06