Name: DELTA®-ALPINA
Brand: DELTA®

Features

30-year functional warranty
Dörken guarantees that a professionally installed DELTA®-ALPINA keeps its watertightness (Class W1) for 30 years. If it fails in that time, Dörken replaces the material and also covers the cost of removal and re-installation.
Class 1 and Class 2 sub-roofs
Used with the DELTA® system components (DELTA®-ALPINA BAND, DELTA®-ALPINA QSM, DELTA®-TILAXX ULTRA and DELTA®-FLEXX BAND), it lets you build a seam-welded underlay with integrated counter batten (Class 1) or with nail sealing tape under the counter batten (Class 2) to the German ZVDH rules (product data sheet UDB-eA).
Safe to work on
The surface is highly slip-resistant and tear-resistant, so installers can move around the roof with confidence.
Less waste
The membrane is built up symmetrically, so either side can face up. That means fewer offcuts and lower material costs.
Works in cold weather
It can still be processed reliably at low temperatures, which helps avoid weather delays on site.
Meets alpine standards
Complies with the demanding Austrian (ÖNORM B 3661 and B 4119) and Swiss (SIA 232/1) requirements for underlays under enhanced and extreme stress.
Heavier grammage
The current version is heavier than before, giving an extra safety margin when welding seams.

Equipped with DELTA®-AMS and DELTA®-BiCo technologies.

Where to Use

A robust, vapour-open underlay for low-pitch roofs, laid quickly and safely on sarking boards or another pressure-resistant deck. Trapezoid counter battens are not needed.

Roll the membrane out without creases and fix it in the top and side overlap zones with concealed staples or clout nails.

Seams are welded homogeneously, either with DELTA®-ALPINA QSM solvent welding agent (seam width at least 4 cm) or with hot air (at least 2 cm; 4 cm under ÖNORM B 4119).

Product Data

Material: Highly tear-resistant PES non-woven fabric with breathable PU coating on top and bottom
Suitability: Fully insulated, ventilated roofs on sarking boards or a comparable pressure-resistant deck
Germany: ZVDH product data sheet UDB-eA (diffusion-open underlays for extended applications)
Austria: underlay DU Type II to ÖNORM B 3661:2017 and ÖNORM B 4119 (enhanced rain resistance)
Switzerland: underlay for enhanced and extreme stresses 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
Shear resistance of joints: approx. 400 N, EN 12317-2
Watertightness: W1, EN 13859-1+2
Sd value: approx. 0.30 m, EN 1931
Service temperature: -40 °C to +80 °C
Short-term max. temperature: +120 °C
Weight: approx. 370 g/m²
Roll weight: approx. 16.7 kg
Roll size: 30 m × 1.50 m