duplas hp

Technical Data Sheet

DUPLAS HP is a high quality polymer-rich APP modified bituminous torch-on membrane with a reinforcement core of spunbond non-woven polyester mat. Used for waterproofing of roofs, balconies, Multi-storey car parks and any concreted or cemented flat surface that need waterproofing in building and civil engineering projects.
The DUPLAS HP 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 polyester mat to the required thickness of the membranes.


  • High mechanical properties: good movement accommodation; resistant to tear and puncture
  • High resistance to hydraulic pressure: provides an impermeable and low absorption layer.
  • High temperature tolerance: stable in tropical climates; resistant to thermal ageing and shock.
  • High chemical resistance: withstands effects of salts and other corrosive agents in soil and water.
  • Versatile: available with a range of reinforcements, thickness and surface finishes for use in variety of applications.

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DUPLAS HP membranes are tested in accordance with UEAtc(European Union for Technical Agreement for Construction Industry) and can be tested as per ASTM D5147 (Standard Test Method), ASTM D6222 (Standard Specification) and other relevant international standards.


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


Nominal weightKg / m23.54.55.5
Dimensions (length x width)[m]10 x 1
CoatingAPP – modified bitumen
Carrier180/200/250 g/m2 polyester mat (P)
Top surfacePolymeric foil(F) or Sand(Q) or Slate(S) or(QQ) for both side sand surface
Bottom surfacePrinted Polyethylene foil

To order specify finish, reinforcement and thickness e.g. DULAS HFP 200 4mm for foil finish, 200g/m2 polyester reinforcement and 4 mm thick sheet membrane.


DUPLAS HP membranes are used where a tough, high quality waterproofing system is needed, such as

  • Substructure waterproofing in buildings and civil engineering works (if specified).
  • External surfaces of underground water reservoirs, pools and other liquid retaining structures (if specified).
  • Floors of wet rooms in all type of buildings.
  • Flat and pitched roofs, balconies, terraces, etc.
  • Re-roofing works to the existing structures.


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 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. If used as Slated surface for exposed application additional surface protection is not required.

Protection: If used in Substructure and underground tanks 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 is recommended; on horizontal surfaces a minimum 25 mm thick sand-cement screed may be used.

DUPLAS HP membranes are also suitable for partially bonded or loose laid installation. Contact the technical department of your local distributor for advice.


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


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


Softening point[o C]ASTM D 36150
Penetration, @ 25oCdmmASTM D 514-21
Heat resistance, 2 hrs. @100oC——-UEAtcNo flow
Flexibility at low temperature[o C]DIN 52123-5 to -10
Water absorption%ASTM 570<0.4
Type of carrierg/m2Spun-bond Polyester Mat
Tensile strength (L/T)[N / 5 cm]UEAtc750 / 650900 / 7001050/850
Elongation (L/T)[%]UEAtc40/4545/5050/55
Tear resistance (L/T)NUEAtc220/235230/245250/265
Puncture resistance Static
———UEAtcL4 Static @ 25 Kg
I3 Dynamic @ 9 Joules

In accordance with the standard up to 20% variation is expected

Note: Tolerances on nominal values shown are as per UEAtc directives for polymer modified bitumen membranes. 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 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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