Roofing membrane, Façade membrane for closed joints DELTA®-MAXX

Extremely tear-resistant, vapour-permeable roofing membrane for all the roof types equipped with covering components. The material is particularly robust, flame retardant and waterproof.
Due to its elasticity and its elevated tear resistance, the roofing membrane is very user-friendly to be processed. In addition, it offers a high level of safety when it comes to installation.

Furthermore, the material can be used as a façade membrane behind a façade cladding with closed joints.

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    DELTA®-MAXX in der Anwendung


  • Very flame retardant
    DELTA®-MAXX is certified as very flame retardant with the fire class B-s1, d2 in accordance with the standard EN 13501-1. This means that the spread of a fire is made more difficult and houses and their residents are offered a better protection.
  • 25 years functional guarantee
    DELTA®-MAXX is also absolutely reliable after years of use. With our 25-year functional guarantee, we offer you the exclusive DÖRKEN quality and long-term performance in writing.
  • Integrated moisture storage
    The products DELTA®-MAXX and DELTA®-MAXX PLUS were the first roofing membranes in Germany equipped with moisture storage. Moisture peaks can be absorbed by the storage fleece on the underside. The moisture can then continuously dry out and any damage to the wooden structure can be avoided.
  • High temperature resistance up to +120°C
    High intensity of solar radiation results in a high temperature load both on the roof covering and on the membrane. With its high temperature resistance, DELTA®-MAXX reliably withstands these phenomena. This is also an indicator of the high level of resistance to aging offered by the membrane.
  • The product may also be used as temporary covering
    DELTA®-MAXX meets all the requirements of the ZVDH regulations and can be used as temporary covering in combination with the system accessories of DELTA®. The result is a temporary protection of the roof structure from moisture and weathering during the working operations on the roof because the works inside the building can be continued.
  • Equipped with DELTA®-AMS and DELTA®-BiCo technologies.


DELTA®-MAXX can be used on pitched roofs with and without hard sheating.
The roofing membrane can be laid rapidly thanks to the smoothed fleece underside.
The high strength in the longitudinal and transverse direction permits a rapid and precise rolling.
The grid structure embossed on the top can be used as an ideal cutting aid.

Technical data

Material Highly tear-resistant polyester fleece equipped with a diffusion-open polyurethane coating.
ZVDH product data sheet Class UDB-A / USB-A
Reaction to fire Fire class B-s1, d2, standard EN 13501-1
Tensile strength approx. 450/300 N/5 cm, standard EN 12311-1 + 2
Watertightness Waterproof W 1, standard EN 13859-1 + 2
Sd-value approx. 0,15 m
Servicetemperature range from -40 °C to +80 °C
Short-term maximum temperature load on the material +120 °C
Resistance against driving rain Passed: Driving rain test of the underlay and the sub-roofing tracks - Technical University TU Berlin
Increased aging requirement Passed, ZVDH product data sheet, Table 1
Weight approx. 190 g/m²
Roll weight approx. 14 kg
Roll size 50 m x 1.50 m




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Would you like information on detailed product properties, use cases or other technical topics?
Then feel free to contact our application department on +49 2330 63 578 or

Do you have questions about prices, availability or the status of your order?
Our sales service will help you with these matters on +49 2330 63 636 or