Key figures
All the numbers at a glance.
All values from the home and product pages collected in one place – system, measured impact and references. For tenders, planning and comparison.
System & technology
Module size800 × 500 mm (0.4 m²) · 2.5 modules per m²
Plantingapprox. 50 plants per m², around 1 litre of root space per plant
Vegetation carriermineral-bound, dimensionally stable, over 45 % water retention per litre of substrate
Total weightbelow 50 kg/m² (fully water-saturated), usually without additional structural measures
Reaction to fireB-s1,d0 according to EN 13501-1:2018
StandardsÖNORM L1136 (AT) · FLL guideline (DE)
Irrigationsensor-controlled on demand, drippers 1.6 l/h every 20 cm, frost protection, remote monitoring
Water consumptionbelow 1 m³ per m² and year
Pre-cultivation8–10 weeks, fully green from day one
Maintenanceas a rule 1 maintenance visit per year
Insulation effect (hot box)U-value 0.72 W/(m²·K) planted & rear-ventilated – around 13 % better than the ungreened wall (0.83); measured insulation effect, not an energy certificate value
Constructionhigh-strength aluminium/steel, corrosion-protected, stainless steel; rear-ventilated
Developmentover 15 years of research & development, including with BOKU Vienna
Measured impact (HEDWIG project, Wien Energie Simmering)
Air temperatureup to 5.6 °C cooler air at the greening (daytime); around 2.5 °C on average during the 2025 heatwave
Solar radiation88–90 % less behind the greening (June/July 2024), up to 98 % during the 2025 heatwave
Surface temperature9–16 °C cooler than sheet metal, masonry or window frames (infrared measurement)
Evapotranspirationaround 129 ml per m²·h; 3–5 l per m² and day in high summer (HEDWIG, MARGRET) – draws heat from the surrounding air (equivalent to 2–3 kWh per m² and day)
Leaf coverage96–99 % projected coverage
References
Completed19 projects, around 2,800 m² in Austria & Germany
AwardBuGG Gebäudegrün des Jahres 2025 · 2nd place (Hauptbahnhof Rheydt)
Wiener Linien LängenfeldgasseVienna · 492 m² · 2025
Barmherzige SchwesternVienna · 260.7 m² · 2024
Hauptbahnhof RheydtMönchengladbach (DE) · 195 m² · 2024
Wien Energie DonaustadtVienna · 147.5 m² · 2022
Cold storage logistics TKLVienna · 144 m² · 2023
Mittelpunktbibliothek BerlinBerlin (DE) · approx. 140 m² · 2025
Wagramer Straße 64Vienna · 106 m² · 2025
PenederFraham (Upper Austria) · 80.8 m² · 2022
GPA WienVienna · 59.6 m² · 2024
Wien Energie SimmeringVienna · 55 m² · 2021 (HEDWIG measurement site)
SeegasseVienna · 50 m² · 2023
Technical values according to NatureBase product documentation (Technical Information 02/2026). Impact values: Stangl R. et al. (2026), HEDWIG project, Berichte aus Energie- und Umweltforschung 59a/59b/2026, BMIMI – depend on location and building. Insulation effect from hot-box measurement. Project areas according to the NatureBase project list.
Technical details → All projects →