- Building Type : Office building < 28m
- Construction Year : 2012
- Delivery year : 2015
- Address 1 - street : 9233 DIEKIRCH, Luxembourg
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 2 750 m2
- Construction/refurbishment cost : 7 500 000 €
- Cost/m2 : 2727.27 €/m2
Primary energy need :
(Calculation method : DIN V 18599 )
The building construction is comprised of three sections and altogether it extends over three full storeys: two regular, wooden buildings, both orientated to the north along the high street and to the south parallel to the walkway on the banks of the Sauer River. With the directional angle predetermined by the building’s position, together they form an inner core with a solid concrete structure providing a stabilizing element.
Innovative concepts were used such as taking water from the adjacent Sauer River to heat and cool the building, targeted ventilation and night cooling using ventilation flaps, a zone-controlled ventilation concept and architecturally integrated PV panels.
This Ministry of Sustainable Development and Infrastructure pilot project produces more energy than it consumes and uses water from the river to control the building’s temperature; it has integrated photovoltaic panels.
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Data accuracy: Third party certified
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3rd part certified
Designeratelier b architecte Christian Barsotti
OthersDaedalus Engeneering s.à.r.l. Ingenieur (Statik)
OthersEnerventis Lux S.A. Ingenieur (HVAC)
OthersE3Consult s.à.r.l. DGNB-Zertifizierung & Bauökologie
OthersInterakustik GmbH Akustiker
OthersIFES GmbH Tageslichtsimulation
OthersAIB Vinçotte Luxembourg Brandschutzkonzept
OthersSeco Luxembourg Kontrollbüro
Owner approach of sustainability
the objective for this building project was to design a building which would not only meet the needs of its future occupants but which would also be optimized for sustainability in every aspect and which in addition would produce more energy than it requires for its operation and construction.
To achieve this, the clients decided at a very early planning stage to ensure that the project would meet the German Sustainable Building Council’s sustainability criteria (Deutsche Gesellschaft für nachhaltiges Bauen (DGNB)) which meant that in addition to ecological and economic criteria, the assessment of its sustainability also included social and technical considerations, process-oriented quality and location.
Two construction volumes with three floors, constructed entirely in timber which contain the office floors with a core set in concrete containing the service areas, staircases, wet rooms and utility shafts. The basement has a watertight, concrete structure and houses the archives, storage rooms and technical facilities. This design has the advantages of a light outer envelope with the wooden construction offering maximum heat insulation and a heavy inner core providing the storage mass, guaranteeing that any variations in temperature inside the building are slight.
Furthermore, for the main structure the number of materials was rigorously limited to the two basic materials – wood and concrete – which give the building its natural calm and clarity. The interior fittings hardly use any other sorts of materials so it is always possible to combine design considerations with technical ones. The individual Douglas fir wooden facade continues the design theme into the outer envelope, giving the building its own particular character. Wood comes to the fore, not only in the outer envelope and the facades, but also in the inner concrete core where the texture of the wood is also both visible and tangible through the concrete surface made from vertical planking. The light floor consisting of a polished cement screed with integrated pipes that cool during the summer and heat during the winter make it possible to have large, homogenous areas because few joints are needed. The wooden ceiling elements as well as the wall cladding using 3-layer solid wood panels round off the materials concept. Differentiation between the various areas and rooms is achieved through white storage elements that alternate with transparent doors and partition walls. The office areas are located in the two upper storeys. In the northern section there is a more enclosed office structure that is lit by a regularly perforated facade. In the southern section of the building there are large open plan areas which offer flexible office space. The modular south facade overlooking the Sauer River is designed as a mullion and transom façade and with the transparent solar shades these areas enjoy the maximum amount of natural daylight throughout the whole space. This means that use of artificial lighting can be reduced to a minimum. The public and semi-public areas in the ground floor such as the reception area, library, presentation and meeting rooms and cafeteria can be glimpsed through the main entrance and the wooden facade as it gradually opens up along the high street.
Net floor area: 2,750 m2
Gross floor area: 3,300 m2
Gross building volume: 12,700 m3
- 80,00 kWhpe/m2.year
- 142,00 kWhpe/m2.year
- 0,15 W.m-2.K-1
- Heat pump
- Low temperature floor heating
- Heat pump
- Reversible heat pump
- Floor cooling
- Double flow heat exchanger
- Solar photovoltaic
- Other, specify
- Heat pump
- 12,81 KgCO2/m2/year
- 143,60 KgCO2 /m2
Life Cycle Analysis
Suspended acoustic panels (floating ceiling panels): Ecophon Solo
SAINT-GOBAIN Ecophon AB
In the work station areas rectangular board ceiling absorbers are SAINT-GOBAIN suspended from the ceilings which can reflect indirect lighting at the same time. Ecophon is made from colour-coated glass wool.
Wooden roof frame: panel elements in the twin wall ceilings
The ceilings in the building’s office sections are made with cavity panel elements with square or rectangular cavities.
These span over 6.00 m from the building core to the exterior walls. Underneath the cavity panels there are visible wooden surfaces. These cavity panels comply with all the guidelines for eco-friendly building, with the certification planned for the building, with fire protection features, with simple and flexible laying of technical cables, with vibration absorption and impact sound protection as well as with the thermal mass activation for the overall structure.
Interior fittings – LivingBoard P2
Pfleiderer Holzwerkstoffe GmbH
Type P2 chipboard glued formaldehyde-free and therefore particularly low-emission, with decorative melamine resin direct coating on both sides in a single sheet construction. Low-emission applications for interior furnishings and furniture, and especially suitable for items which need to comply with the DGNB’s stringent requirements regarding lack of contaminants in indoor air.
Acoustic panels & wall cladding: Agrop 3-layer European Spruce CE SWP/2 Top Nature
AGROP NOVA a.s.
AGROP multilayer panels are produced from coniferous sawnwood and are dried to 8%
(larch 12%). Each layer consists of a solid wood lamella (top layer). The 3-layer panels have a middle layer, which is rotated by 90° relative to the two outer layers. AGROP multilayer panels are manufactured from natural wood in compliance with strict environmental standards. The adhesive used is water-resistant and gluing of the top layer is AW 100 and D4 conforming to international standard EN 204, and for this formaldehyde-free gluing is carried out.
Wood wool panels: Troldtekt – Wood wool panels
Troldtekt Deutschland GmbH
Troldtekt is the classic panel in the Troldtekt range, comprised of a single layer it is used in many different types of buildings. Troldtekt acoustic panels are CE-marked and comply with the requirements for fire protection classification B-s1,d0 (low flammability). Troldtekt acoustic panels can be installed directly onto wooden battens or in a suspended profile system. These wood wool panels are composed solely of natural materials: wood and cement.
Design screed: Variety-Floor design screed, Granidur Bianco/Nero
KORODUR International GmbH
Design screed Granidur Bianco and Granidur Nero is a cement-based resin-free building material. This is a factory-produced ready-to-use dry mortar for the production of polished, decorative screeds with a top layer of 15 mm average thickness. Given its high resistance to mechanical loads, its durability and anti-slip properties, it is especially suitable for office and administration buildings.
Honeycomb fill: Fermacell
Fermacell honeycomb screed is laid over all the wooden floor elements. Then the honeycomb and areas with fittings and piping are filled in with a fill. Finally sound insulation is laid over the honeycomb fill (Rockwool Floorrock SE). The fill is used to increase mass and optimize the noise absorption properties of the overall structure.
Sound dampening: Rockwool Floorrock SE
DEUTSCHE ROCKWOOL Mineralwoll GmbH & Co. OHG
Sound dampening for ceilings underneath screed constructions. Restricted surface loading capacity with extremely good sound insulation. Sound dampening measurements of integrated slabs produce an estimated subsonic noise level of 73 dB. By using Rockwool SE a value of 53.4 dB can be achieved.
Located at the entrance to Diekirch directly opposite the railway station, only the pedestrian precinct separates this new building from the adjoining bank of the Sauer River. The plot is a narrow cuneiform strip of land between the high street and the Sauer and the building is comprised of two wooden constructions that fan out opposite one another and which are connected by a narrow building core. With the Sauer River and its river bank walkway at the back on the south side and at the front the high street with a continuous sweep on the north side, there are two axes that converge at a point and which give the concept its fundamental shape. A third axis has been established with the planned pedestrian passage from the railway station to the river walkway. Originally a perimeter block that stood at the entrance to Diekirch, this plot provided an opportunity to create a structure which would mark the entrance to the town. As far as transport connections are concerned, being part of the “Nordstad” development this prominent location is of even greater significance given that it is sited opposite the railway station.