Roofing membrane delta®-alpina

Tear resistant roofing membrane for slightly inclined flat roofs. Can be welded with hot air or solvent welding agent.

In combination with the DELTA® system components the roofing membrane enables the creation of a rain-proof and watertight sub-roof in accordance with ZVDH regulations.

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    DELTA®-ALPINA in der Anwendung auf einem flach geneigtem Dach
    smallRetina 08:59:52
    DELTA®-ALPINA in der Anwendung auf einem flach geneigtem Dach
    smallRetina 08:59:52
    DELTA®-ALPINA in der Anwendung auf einem flach geneigtem Dach
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    DELTA®-ALPINA Verlegung
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    DELTA®-ALPINA in der Anwendung

Advantages

  • 25-year guarantee of function
    DELTA®-ALPINA remains completely reliable after years of use. The exclusive DÖRKEN quality and long-term performance are confirmed in writing: with our 25-year guarantee of function.
  • Enables the creation of a rain-proof and watertight sub-roof
    In combination with the DELTA® system components (DELTA®-ALPINA BAND, DELTA®-ALPINA QSM, DELTA®-FLEXX-BAND) DELTA®-ALPINA enables the creation of a rain-proof and watertight sub-roof in accordance with ZVDH regulations.  An “individual contractual agreement” is to be concluded between contractor and customer for the creation of a rain-proof or watertight sub-roof.
  • Maximum laying safety 
    The surface of the roofing membrane is extremely slip and tear-proof, offering maximum safety during application.
  • Minimal offcuts 
    The symmetrical structure means that DELTA®-ALPINA can be applied irrespective of side. This results in minimal offcuts. This saves material and costs.
  • Processing also possible at low temperatures
    DELTA®-ALPINA guarantees assured processing - even at low temperatures. This helps avoid weather-related downtime.
  • Strict standards fulfilled
    DELTA®-ALPINA meets the strict standards of the alpine nations Switzerland and Austria.
    Austria: Underlayment (DU Type II) according to ÖNORM B 3661:2017 and according to ÖNORM B 4119 for sub-roofs with enhanced rain resistance
    Switzerland: Underlayment for enhanced and extreme stresses according to SIA 232/1:2011
  • Equipped with DELTA®-AMS and DELTA®-BiCo technologies.

Application

DELTA®-ALPINA can be laid quickly and safely. Trapezoid counter battens are not required.
The product is laid onto a casing or comparable pressure resistant surface. The roll must be aligned without creasing. The roll is secured in the area of the upper and side overlaps using concealed staples or clout nails.
Welding can be undertaken homogeneously with both DELTA®-ALPINA QSM (welding seam width min. 4 cm) and hot air (welding seam width min. 2 cm. ÖNORM B 4119 min. 4 cm). 

Technical data

Material Highly tear-resistant PES non-woven fabric with breathable PU coating top and bottom.
Suitability In the case of fully insulated and ventilated roofs, on casing or a comparable pressure resistant surface.
Germany: Underlayment according to ZVDH Class UDB-A
Austria: Underlayment (DU Type II) according to ÖNORM B 3661:2017 and according to ÖNORM B 4119 for sub-roofs with enhanced rain resistance
Switzerland: Underlayment for enhanced and extreme stresses according to SIA 232/1:2011
Reaction to fire Class E, EN 13501-1
Fire index 4.2, VKF
Tensile strength approx. 450/410 N/5 cm, EN 12311-1+2
Shearing resistance of joints approx. 400 N, EN 12317-2
Watertightness Watertight W 1, EN 13859-1+2
Sd-value approx. 0.30 m, EN ISO 12572
Servicetemperature range from -40 °C to +80 °C
Short-term maximum temperature load of the material +120 °C
Weight approx. 350 g/m²
Roll weight approx. 16 kg
Roll size 30 m x 1,50 m

Accessories

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Contact

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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 atabvf@doerken.de.

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 membranes@doerken.de.