duplas ag

Technical Data Sheet

DUPLAS AG is a high performance heat resistant, waterproofing sheet membrane, reinforced by a tough non-woven glass mat to provide excellent dimensional stability. The mat is thoroughly impregnated and coated both sides with APP modified bitumen.

The plastomeric nature of the synthetically modified coating is designed as a homogeneous mixture of a special bitumen and high quality type virgin APP polymer that ensures high product quality and outstanding performance. The top surface of the membrane is covered with special tough heat reflective Aluminum foil and the bottom is laminated with fast melting Polyethylene foil.

Download Now


DUPLAS AG is used as

1-Cap sheet in a single or in multi layer waterproofing systems for new –building projects as well as for re-roofing.

2-The membrane is highly durable and flexible that it can be applied to various types of exposed roofs.


  • Excellent heat resistance and dimensional stability.
  • Outstanding resistance to weathering and UV-radiation.
  • Solar reflective flashing membrane
  • Cost effective.
  • High resistance against mechanical damage.
  • Excellent resistance to soil and wide range of chemicals compounds.
  • Rot proof.
  • Excellent impermeability to water


Nominal WeightKg/m23.54.5
Dimensions [length X width][m]10 X 1
Coating—–APP – modified bitumen
Carrier—–Glass fiber 50-60 g/m2  glass fiber mat
Top—–Aluminum Foil
Bottom—–Printed Polyethylene foil


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.

The use of APP modified bitumen provides excellent flexibility in laying conditions, even at high ambient temperature, and because of its higher softening point, the installation is made by torch-application.

Contact the technical department of your local distributor for advice.


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


There are no direct health hazards associated with DUPLAS 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 36Min. 150
Penetration, @ 250CdmmASTM D 514 – 21
Heat resistance, 2 hrs. @1100C——UEAtcNo flow
Flexibility at low temperature[° C]DIN 52123-2 to -5
Water absorption%ASTM 570<0.4
Tensile strengthN/5 cmUEAtc400/280

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.

Duproof Download And Send