Roofing membrane, Roofing membrane for hard sheathing DELTA-XX PLUS® STRONG

This extremely tear-resistant roofing membrane is highly reliable, as it impresses with proven longevity. This provides fully-insulated pitched roofs – whether with or without formwork – with long-term protection. The reinforced fabric of the breathable membrane ensures its high tear resistance. It can withstand the toughest weather conditions!

In addition, the membrane was also developed specifically for large batten widths and offers a high level of safety during application.

New from 01/01/2023

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  • Proven longevity
    DELTA-XX PLUS® STRONG offers proven longevity. A characteristic that our membrane has illustrated under the toughest conditions and in a range of test procedures. The corresponding ETA also testifies to the high performance and resistance. 
  • Guaranteed functional for 30 years
    We grant a 30-year warranty on our DELTA-XX PLUS® STRONG – including costs of installation and removal. Our promise for your protection! If a warranty case occurs, we will deal with this immediately and without complication. This means that you are always on the safe side.
    Click here for the warranty statement.
  • Integrated adhesive strips
    Particularly practical are the integrated adhesive zones on both edges, enabling swift and reliable gluing of overlaps. At the same time, they also keep out cold air and moisture. This ensures more efficiency, comfort and cost savings
  • Especially tear resistant
    The four-layer structure of the membrane comprises a spun-bonded fabric foil combination with integrated, strong grid reinforcing. This means that DELTA-XX PLUS® STRONG is especially robust and tear resistant. An advantage that makes installing the membrane considerably safer and also delivers long-term protection for the roof.

DELTA-XX PLUS® STRONG corresponds with DIN 4426 with large-format tiles.


The new DELTA-XX PLUS® family


Whether it is ventilated or unventilated pitched roof structures with or without formwork – DELTA-XX PLUS® STRONG is suitable for a wide range of applications. In addition, the membrane can also be used as temporary roofing for up to four weeks, giving the roof reliable protection against the elements during the construction phase. The roofing membrane can also be used as a base layer under metal roof coverings, fibre cement panels or slate, as well as façade membrane behind ventilated cladding with closed joints.

Technical data

Material Multi-layer roofing membrane from tear-resistant, breathable combination of PP spun-bonded fabrics, fabric reinforcement and PU functional layer. With integrated self-adhesive strips.
Reaction to fire E (EN 13501-1)
Fire index no. 5.2 (VKF)
Tensile strength approx. 500/500 N/5 cm (EN 12311-1)
Watertightness Class W1 (EN 1928)
Sd-value approx. 0,08 m (EN ISO 12572)
Servicetemperature range -40°C to +80°C
Short-term maximum temperature resistance of material (< 8h / day) to +100°C
UV-related outdoor weathering duration 12 weeks
Temporary roofing function 4 weeks
Resistance against driving rain passed (Driving rain test for lining and underlay sheeting – TU Berlin)
Enhanced ageing resistance requirements passed (ZVDH product data sheet , table 1)
Weight approx. 180 g/m²
Roll weight approx. 14 kg
Dimensions 50 m x 1,50 m
CE conformity EAD 030218-01-0402 / EN 13859-2




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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