duplas g

Technical Data Sheet

DUPLAS G is a high quality polymer-rich APP modified bituminous torch-on membrane with a reinforcement core of tough glass fiber used as a first layer in multi-layer roof waterproofing systems.The DUPLAS range belongs to the plastoproof group of membranes produced using a special grade of bitumen modified with virgin APP polymer. The polymer-rich mixture is used to saturate and coat both sides of the glass fiber mat to the required thickness of the membranes


1-High heat resistance

2-Excellent rot and corrosion resistance with high dimensional stability.

3-Excellent resistance against and thermal shocks.

4-High chemical resistance: withstands effects of salts and other corrosive agents in soil and water.

5-Absolute impermeability to water

6-Versatile, available in wide range of finishes and thickness.

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DUPLAS G membranes conform and exceed the requirements of ASTM, UEAtc and other relevant international standards.


Duproof is an ISO 9001 Quality Assured company, and DUPLAS G membranes carry a material warranty against any manufacturing defects.


Nominal WeightKg/m23.54.5
Dimensions (l X w)[m]10 X 1
CoatingAPP – modified bitumen
Type of Carrier 50-60 g/m2  glass fiber mat
TopPolymeric foil (F) or Sand (Q) or Slate (S)
BottomPrinted Polyethylene foil

To order specify finish and thickness e.g. DUPLAS FG 4mm for foil finish, glass reinforcement and 4 mm thick sheet membrane.

DUPLAS G membranes are used

  • As a first layer in multi-layer roof waterproofing systems.
  • In waterproofing of substructures such as concrete footings, tie beams, neck columns and below grade walls.


Surfaces onto which the membrane is to be applied must be sound, clean and dry. Dust, loose material and protrusions must be removed and cracks, holes etc made good.

Priming: Apply one coat of DUPRIME solvent-based bituminous primer to all surfaces at 5-6m²/lit and allow to dry. Primed surfaces must be covered within the same day. If left exposed for longer periods, clean and re-prime before applying the membrane.

Membrane Application: Position the rolls carefully with the correct orientation before the torching operation begin. Heat the lower surface of the rolls with a propane gas torch and unroll as the bitumen begins to melt. Maintain minimum 100 mm side laps and 150 mm end laps between rolls, staggering the joints where possible. All seams must be heat sealed from the top to ensure watertight laps.

Protection: Once laid, it is recommended to protect the membrane from long-term exposure, construction abuse and backfill, preferably within 24 hours. On vertical areas DUBOARD protection board is recommended; on horizontal surfaces a minimum 25 mm thick sand-cement screed may be used.

Contact the technical department of your local distributor for advice.


DUPLAS G membranes are supplied in rolls of 1m x 10m; shrink wrapped on pallets. Rolls must be kept upright on pallets under shade. DUPLAS G pallets should not be stacked over each other.


There are no direct health hazards associated with DUPLAS G membranes. Normal precautions for hot and volatile substances should be observed during application. Refer to our MSDS sheets for advice.


Softening point[° C]ASTM D 36150
Penetration, @ 250CdmmASTM D 514-21
Heat resistance, 2 hrs. @1100CUEAtcNo flow
Flexibility at low temperature[° C]DIN 521230 to -2
Dimensional stability- (L/T )%UEAtc±0.5 / ±0.5

Note: These data are correct at the time of printing but may be changed without any prior notice subject to clients requirements availability of raw materials or other conditions. This data sheet supersedes all previous publications pertaining to this product. All reasonable care has been taken in preparing this document, which to the best of our knowledge is accurate and true. Recommendations and suggestions are made in good faith and should only be considered for general guidance. No liability is assumed or taken by us in relation to the application, as usage conditions and any labour involved are beyond our control.

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