GEO-Fabrics-COL-Logo-155x45.png (1)

Cuspate Drainage Composites

GEOfabrics cuspates are polymeric sheet materials that have been vacuum formed into either a stud or cup to provide a void space for the passage of liquid or gas. They are available in a range of heights to suit design requirements.

Cuspate Composite

It is common for a cuspate to be used as a component in a Geocomposite, in conjunction with a geotextile filter. They are commonly used in gas protection systems, cut off walls around contaminated land, at the rear of bridge abutments and retaining walls, and around buried structures. GEOfabrics manufacture Cuspates from optimum quality high density polyethylene or polypropylene, which is extruded into a range of different thickness membranes.

The sheet is formed in an extrusion process, whereby semi-molten polymer is extruded through a flat die, with normal thicknesses from 0.4 to 2mm. These impermeable membranes are vacuum formed into geocuspated cores between 6mm and 40mm thick, depending on the mechanical and hydraulic properties required.

Vacuum forming is a simplified version of thermoforming, whereby a sheet of plastic is heated to a forming temperature, stretched onto a single-surface mould, and forced against the mould by a vacuum (suction of air).

An alternative to Vacuum forming involves a continuous process where semi-molten polymer is formed between two corresponding rollers with male and female forming points. This process allows us to control quality from polymer source through to finished cuspated drainage core.

Typical uses are:

  • Green Roof systems
  • Horizontal drainage systems
  • Vertical Drainage systems
  • Gas Venting systems
  • GEOfabrics cuspates are named in accordance with the thickness of the material; e.g. CO20 = 20mm thick
  • They are also supplied as composites with a geotextile filter bonded to either one side (FC) or both sides (FCF)

View Related Products

GEOfabrics has a range of products across a variety of different sectors

RK4 – Trackbed Geocomposite

PadTex – Energy Sector Lining System

LFX – Landfill Basal Drainage Composite

Geomembrane composites (FM/FMF)

Net Based Composites (FN/FNF)

GPT Range


Other Product Categories

GEOfabrics has a range of products across a variety of different sectors




View Related Sectors
& Solutions

See how GEOfabrics can help you in other areas

Gas Venting

Discover how GEOfabrics can help you
Contact us for more information and assistance.

View our Technical Hub

Industry News

ISO 14001 & 9001 Certification

GEOfabrics certified to ISO9001 and ISO14001

Flood and Coast Telford

Future Landscape and Playspaces 2023

Recent Tech Papers

Root Barriers Comparison Report

Geocomposite to Prevent Pumping Failure

CuTex Root Barrier Effectiveness Report

Development of Geocomposite to Prevent Mud Pumping

Geocomposite Material In Landfill Containment

Geosynthetics in Coastal Engineering Protection

Difficulties with Unit Weight

Designing with the Cylinder Test

Recent Downloads

Case Studies

York Flood Alleviation Scheme Case Study

Culemborg Geldermaston Inspection Pads Rail

Case Studies

Rivenhall Integrated Waste Management Facility Slope Drainage – GPT Drainage Geocomposite

Installation Guides & Certificates

ISO 14001 & 9001 Certificate

Design Information

LFX Stone Selector Guidance

Design Information

Cylinder testing geomembranes and their protective materials: LFE2

Design Information

Introduction to Geosynthetics

Rail Rig Laboratory Test

Case Studies

York Flood Alleviation, Erosion control – HPS2.5

Rivenhall Integrated Waste Management Facility Slope Drainage – GPT Drainage Geocomposite

Culemborg Geldermalson Rail Inspection Pad – RK12 Drainage Geocomposite

Geotextiles for Coastal Protection – HPS14C Case Study

GEOfabrics HPS14C has been successfully installed below the rock armour at Withernsea. Nearly 70,000 t...

Urban Greening Project – Rome

Municipio Roma VII is the most heavily populated Municipio in the Italian Capital with more than 300,0...

Residential Root Protection – CuTex Case Study

As part of a wider contract PBA Solutions were responsible for the design and installation of a tree r...

View Sectors

GEOfabrics cover a wide range of sectors.

Root barriers


The construction industry is under ever increasing legislative and commercial pressure which require innovative appro...

General Civils

The use of geosynthetics in civil engineering applications has continued to grow exponentially over the last two deca...


The design of an engineered waste containment system is considered a continuous project, including all operational ac...

Coastal & River Defence

Marine erosion can occur when the sea is energised by wind and gravity to produce waves, tides, and currents: it is c...


Geosynthetics have been employed to perform a number of functions in track construction and rehabilitation for almost...
Discover how GEOfabrics can help you today
Contact us for more information and assistance.