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Derbigum CG

Waterproofing Membranes for Tanking and Buried Work

The Derbigum CG (Civils Grade) range of products, has been designed to meet the specific requirements for waterproofing in buried and covered situations.

Fields of application

The CG range has been designed and developed for waterproofing in situations such as:


The Derbigum CG range of products comprises of an APP-modified bitumen matrix which has been combined with a composite core of polyester and glass fibre.

This composite carrier imparts high tensile strength and dimensional stability. It is centrally located in the sheet's thickness which results in greater flexibility and ease of torching on either side of the sheet. In the two-layer CG system this assures homogenous bonding, both at laps and to each other.

In a tanking or buried situation, the CG System should be specified as a double layer combination, comprising of one layer CG3 and one layer CG4, fully bonded by means of torch fusion, so as to provide your best protection. Depending on the circumstances and limited risk requirements, either Derbigum CG4 or CG3 may be used in a single layer application.


CG2 CG3 & CG4 CG4H
CG2 is a non-waterproof membrane that is used as a slipsheet, protection sheet, or separation layer. CG2 may be either bonded or mechanically fixed by means of clout nails and roofing washers.

Because of its many attributes, together with its excellent tear resistance CG3 performs as an ideal underlay for Derbigum CG4 or Derbigum SP4 in roofing applications.

CG4H has root growth inhibitors added to the APP matrix. Used in horticultural situations.
Note: Plant types with non-aggressive, non-invasive root systems to be used.



  CG2 CG3 CG4 CG4H
Thickness 2 mm 3 mm 4 mm 4 mm
Width (± 1%) 1000 mm 1000 mm 1000 mm 1000 mm
Length - roll (± 1%) 10 m 10 m 10 m 10 m
Weight - per meter2 (approx) ± 2.1 kg/m2 ± 3.2 kg/m2 ± 4.2 kg/m2 ± 4.2 kg/m2
Weight - per roll (approx) ± 21 kg ± 32 kg ± 42 kg ± 42 kg
Polyester and glass ≥ 100 g/m2 ≥ 100 g/m2 120 g/m2 120 g/m2

CG4 Physical Properties

(minimum performance characteristics)

Tensile Strength 100 mm Longitudinal 380N Transverse 280N
Tensile Elongation   Longitudinal 50% Transverse 60%
Tear Strength Die No. C - ASTM D624 Longitudinal 50N Transverse 50N
Flexibility Derbigum CG was formed over mandrels
diameter 100 mm, 50 mm and 20 mm at 0°C.
Cracking of the surface occurred over 20 mm mandrel only.

Specifications are subject to change without notification. Results shown reflect the minimum performance required
and show the typical test procedures used. Actual field performance will depend on installation methods and site conditions.

Cross Section of Derbigum CG

Cross Section of Derbigum CG


For information on application, safety and storage, please download the data sheet.