dulas Ag

Technical Data Sheet

DULAS AG is a high quality polymer-rich SBS modified bituminous torch-on membrane with a reinforcement core of tough glass fiber, used as a capping layer in waterproofing system. The DULAS range belongs to the Elastoproof group of membranes produced using a special grade of bitumen modified with virgin SBS 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. The top surface of the membrane is laminated with a high quality aluminum foil, which protects the membrane from weathering, UV rays and the bottom surface covered by torchable polyethylene foil.


  • As a capping layer in waterproofing systems. Where reflectivity is required.
  • As a base flashing over the parapet.
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  • Good tensile strength.
  • High heat resistant.
  • Excellent rot and corrosion resistance.
  • Outstanding dimensional stability.
  • High tear resistance.
  • Excellent resistance against mechanical perforation.
  • High resistance to thermal shock.
  • Easy application even at cold temperature conditions.
  • Highly resistant to dilute chemicals.
  • Absolute impermeability to water


DULAS AG membranes conform and exceed the requirements of ASTM, UEAtc and other relevant international standards.


Duproofis an ISO 9001 Quality Assured company, and DULAS AG membranes carry a material warranty against any manufacturing defects.


Thickness(mm)3.0, 4.0, 5.0
Nominal weightKg / m23.5, 4.5, 5.5
Dimensions (length X width)[m]approx. 10 X 1, 8 X 1
CoatingSBS modified Bitumen
Type of carrierGlass grid mat  60 gm/m2
TopAlkali proof Aluminum foil
BottomPolyethylene foil

To order specify thickness e.g. DULAS AG 4 mm for aluminum finish, glass reinforcement and 4 mm thick sheet membrane.


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 5-6 m²/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 begins. 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.


DULAS AGmembranes are supplied in rolls of 1m x 10m, shrink wrapped on pallets. Rolls must be kept upright on pallets under. DULAS AG pallets should not be stacked one over the other.


There are no direct health hazards associated with DULAS AG 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 36120
Penetration, @ 250CdmmASTM D 525 – 35
Heat resistance, 2 hrs. @1000CUEAtcNo flow
Flexibility at low temperature[° C]UEAtc-5 to -10
Water absorption%ASTM D 570< 0.4

Note: These data are correct at the time of printing but may be changed without any prior notice subject to client’s requirements availability of raw materials or other conditions. This data sheet supercedes all previous publications pertaining to this product. All reasonable care has been taken in preparing this document which to the best 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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