PHBdW: Passivhaus Bau der Woche 09

Neue Heimat Tirol is a city and state-owned development company dedicated to building low-income housing that is energy efficient and design oriented. Many of their projects incorporate a mix of low-income housing, elderly apartments and condos. One of their most recognizable and celebrated undertakings is the Wohnen am Lohbach, completed by Baumschlager & Eberle in 2000.

In 2005, the city of Innsbruck and the local architektenkammer (architecture chamber) held a competition for housing in the Lodenareal. The site, located along the Inn, in the northeast section of the city, formerly held a textile factory.

The competition was won by architekturwerkstatt din a4, with team k2 architekten and architekturhalle Wulz & König placing second and third. The winning scheme was 3 blocks of 2 “el” shaped buildings, each forming a semi-open courtyard. Architekturwerkstatt din a4 and Team K2 designed the 2 blocks for Neue Heimat Tirol, which contain 354 rental units. The third block was developed for ZIMA by Wulz & König.

The cantilevered balconies utilize Schöck Isokorb Type K elements to minimize thermal bridging. 11,300 square feet of roof-mounted solar collectors provide over half the building’s DHW needs. Space heating is supplied mostly through a pellet boiler. Since the loads are so small, heating can be supplied through the floor.

Wall assembly, U-value=0.13 W/m²k (R-43.7)

  • 1 cm plaster finish
  • 24-30 cm EIFS (EPS)
  • 18 cm reinforced concrete
  • 1.5 cm plaster

Roof assembly, U-value=0.11 W/m²k (R-51.6)

  • 10 cm extensive planting
  • waterproofing
  • 30-36 cm EPS
  • Vapor barrier
  • 20-31 cm reinforced concrete deck

Basement Floor assembly, U-value=0.12 W/m²k (R-47.4)

  • Wood flooring
  • Screed and foil
  • 3 cm impact insulation
  • 20 cm reinforced concrete deck
  • 26 cm insulation
  • Windows: U-value=0.78 W/m²K (R-7.5), COG U-value=0.6 W/m²K (R-9.4), SHGC=51%
  • Airtightness: 0.20 ACH50
  • Heating Demand: 14.5 W/m²Ka (4.43kBTU/ft²/a)

Pushing for low-tech solutions, low operation and heating costs, and energy independence – Neue Heimat Tirol sounds like an incredible organization to work with. These strategies allow them to work with some stellar architects, producing quality buildings for those that might not otherwise be able to afford it. The Lodenareal complex is expected to save an astonishing 680 tons of CO2 per year. This is an area where Passivhaus really shines – nearly achieving 2030 Challenge now, at costs slightly more than code minimum buildings. We predict that larger housing estates meeting passivhaus will become the norm, as cities and developers realize significant cost savings can be achieved through these schemes.

Further Reading

  • renderings (pdf)
  • DIN A4 writeup (pdf)
  • construction details (pdf)
  • plans and sections (pdf)
  • neue heimat tirol photos, further information (pdf)

The International PH Alliance has announced that the next International Passivhaus Conference will be May 27-28 in Innsbruck, specifically due to the Lodenareal (pdf). Looks like the perfect time to catch some of those Vorarlberg and Tirolean projects we’ve been meaning to visit…


One response to “PHBdW: Passivhaus Bau der Woche 09

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