derbigum south africa logo
home button Derbigum Products Specifications Data Sheets Contractors Contact
gif of buildings Related Products Banner
Derbigum SPDerbigum CGRelated Products

Derbigum SP

Dual Reinforced Membrane Specified for Exposed Waterproofing

The Derbigum SP (Special Polyester) range of products has been designed to meet the specific requirements for waterproofing in exposed situations. The product is manufactured in South Africa to suit the harsh African climate and conditions.

Fields of application

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


Derbigum Special Polyester 4 mm Roofing is a high performance, UV stable, polymer modified bitumen waterproofing membrane. This dual reinforced product comprises of a high strength polyester core and a top layer of reinforced glass tissue. Derbigum Special Polyester Roofing is compatible with most existing materials, and systems.

Primary Uses

Parapet Walls Exposed Roofs Parking Decks



  SP3 SP4 SP5
Thickness 3 mm 4 mm 5 mm
Width 1000 mm 1000 mm 1000 mm
Length - roll 10 m 10 m 8 m
Weight - per meter 2 (approx.) ± 3.2 kg/m2 ± 4.2 kg/m2 ± 5.25 kg/m2
Weight - per roll (approx.) ± 32 kg ± 42 kg ± 42 kg
Polyester ≥ 100 g/m2 120 g/m2 120 g/m2
Glass Fibre 50 g/m2 50 g/m2 50 g/m2

SP4 Physical Properties

Tensile Strength 50 mm Longitudinal 469N Transverse 374N
Tensile Elongation   Longitudinal 40% Transverse 55%
Tear Strength Die No. C - ASTM D624 Longitudinal 72N Transverse 77N
Flexibility Derbigum SP4 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.
Dimensional Stability
at High Temperature
Test 28 days exposure at 80°C:
movement less than 1 mm/m

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 SP

cross section of Derbigum SP


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