Holzwohnen, Wien

Green living in the city

The "Holzwohnen Wien" project is an example of sustainable densification in urban areas: the office Holzbau Mach is replacing the existing buildings on its own premises with a high-quality residential building with 21 rental flats - and its own office on the ground floor of the building. The new building in the 14th district is being constructed using solid timber construction. The focus of "Holzwohnen" is on ecological living and a comfortable climate, so Felix Mach, planner of the project and managing director of Mach Holzbau, also relies on energy-efficient surface temperature control, which also ensures special living comfort: it heats in winter and cools in summer. The client also relies on quality for the drinking water installation.

Dati di progetto:

  • Wien, Austria
  • Palazzina residenziale
  • Completamento lavori: 2021

Contributo Uponor

  • Surface temperature control with Uponor Tacker underfloor heating wet system
  • Hygienic drinking water installation on the floors
  • Convenient installation of the distribution and riser lines
CO2 in view


Wood as a building material facilitates green building enormously; compared to other building materials, it has a neutral CO2 balance: one tonne of CO2 is bound in every cubic metre of wood. In solid wood construction, i.e. building with multi-layered solid wood panels glued together at right angles to each other, large quantities accumulate so quickly - about 600 m³ of solid cross-laminated timber was used for the new building. "Holzwohnen" thus stores 600 tonnes of CO2, which is roughly equivalent to the pollutant emissions of ten cars over a period of 37 years.


"During the entire planning process, the focus was on building sustainably and enabling ecological living," explains Mach. Accordingly, geothermal energy was chosen as the energy source for heat generation in combination with a heat pump for this project. "This heating technology is particularly efficient when the temperature level only needs to be raised a little, i.e. the flow temperature of the heating system is low," explains Mach. "This is the case with surface heating systems. Among other reasons, this is why we opted for panel heating from Uponor for the entire 1,400 square metres."


Well tempered in all seasons


For the planner and client, the focus of the "Holzwohnen Wien" project was not only on ecological living, but also on flats with a feel-good climate. "The underfloor heating ensures even warmth - there is no coldness underfoot. The best prerequisites for feeling really comfortable at home," emphasises Mach. In summer, the system creates pleasant cooling in the same way. Because by opting for geothermal energy, the builder-owner has also created the basis for pleasant room temperatures on hot summer days: The comparatively cold earth temperature is then used for cooling.


"Simple" convinced the experts during installation


The ease of installation also played a major role in the decision to use the Uponor Tacker underfloor heating wet system for the underfloor heating. All the components are precisely coordinated with each other and so the system is installed quickly, easily and - thanks to the appropriate tool - ergonomically. And all components are designed for maximum safety and reliable operation.


For the drinking water installation on the individual floors, the installation company Bernhardt Gebäudetechnik used Uni Pipe PLUS and the associated S-Press PLUS fittings up to dimension 32. Uni Pipe PLUS is characterised by the innovative SACP technology (Seamless Aluminium Composite Pipe) - it is the world's first multilayer composite pipe with a seamless extruded aluminium layer. The innovative pipes allow up to 40 percent tighter bending radii than conventional composite pipes, so that changes in direction due to pipe bends are easy to implement during installation. This means fewer fittings and a shorter assembly time. S-Press PLUS fittings are particularly robust and facilitate easy installation thanks to corresponding colour coding.


The distribution and riser pipes made of composite pipes used were also particularly easy to install thanks to the modular Uponor RS press fittings - thanks to pre-pressing on the workbench. On site, the pre-assembled composite pipe sections could then simply be inserted and locked into the fittings without the need for tools. This meant there was no need for strenuous work with heavy pressing tools at narrow angles or in an overhead position.


Ecological living down to the smallest detail


Holzbau Mach also paid attention to sustainability when it came to the other building materials. "We rely on natural materials," emphasises Mach. This applies, for example, to the thermal insulation: mineral wool was used for the exterior insulation and wood fibre insulation was chosen for the interior. Natural building materials such as clay plaster on the walls, visible wooden ceilings and the oiled real wood parquet regulate the humidity and provide a noticeably better indoor climate. The built-in windows and patio doors have triple insulating glazing and thus also high insulation values - they keep the noise level of the busy Linz street outside. "With "Holzwohnen" we have created a real oasis of well-being in the middle of Vienna," Mach sums up.

Informazioni sul progetto

Linzerstrasse 359, 1140 Wien


Sito web

Anno di fine lavori

Tipo di progetto
nuova costruzione

Palazzina residenziale

Product Lines
Uponor S-Press PLUS
Uponor Tacker
Uponor Uni Pipe Plus
Uponor MLC
Uponor RS



Building owner:

Mach Holzbau, 


Execution of building services:

Fa. Bernhardt Gebäudetechnik GmbH, Biedermannsdorf

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