Contractor

Name : Propriétaire privé

Construction Manager

Name : Vasistas

Contact : [email protected]

 https://www.vasistas.be

Stakeholders

Function : Designer

Vasistas

[email protected]

 https://www.vasistas.be


Architecture

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Function : Structures calculist

Plan B Ingénieurs-Conseils

[email protected]

 http://www.planb-ic.lu/


Technical engineer

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Function : Other consultancy agency

Betic Ingénieurs-Conseils

[email protected]

 https://www.betic.lu


Technical engineer

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Function : Manufacturer

Leko Labs

[email protected]

 https://www.lekolabs.com/


Manufacturer / Supplier of prefabricated elements

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Function : Company

François Kieffer

[email protected]

 https://www.fkieffer.com/


Installer

Contracting method

Separate batches

Owner approach of sustainability

Although the choice of a concrete framework and the use of "classic" materials were initially privileged, the discussions between the client and the architect led them in a second time to apprehend the project in a a more sustained sustainable development approach and thus favor a prefabricated wooden framework , of which the wood used for the manufacture of the walls comes from the Greater Region (Vosges, Black Forest, Luxembourg, etc.).

This choice made it possible to provide a more complete response to needs, by integrating urban planning, functional and technical considerations with the economy of resources, ecology and the biology of materials. The realization of this building thus demonstrates that a new type of construction is possible in the field of single-family homes, whatever their sizes.

Thanks to proven techniques such as underfloor heating or a cooling ceiling system to ensure comfort and techniques to increase the ecological quality of the building such as the recovery of rainwater via 2 cisterns (one on the garden side and one street side), a photovoltaic installation on the roof, treatment with biological filtration for bacteria in the swimming pool, the building was designed to promote a balance between ecological approach and functional construction. Also with an ecological perspective, the installation of two stations for recharging electric cars has also been planned.

The special techniques also include a geothermal heat pump system for heating needs, a heat pump coupled with a thermal system for the production of domestic hot water and a double flow ventilation system with heat exchanger .

The approach taken by the various actors in the project will enable the building to obtain an energy performance class A and aim to obtain the Luxembourg sustainable construction certification “ LENOZ ”.

Architectural description

The architectural concept consisted of creating a building that would dare to assert itself with certainly the purest lines, but while entering into dialogue with the existing heritage of the district. Thus, the architecture is intended to be more timeless than contemporary , in accordance with the wishes of the client. The creation of several volumes which "fit together" with in particular a recessed top floor, give a certain lightness to the volume . The lines are therefore intended to be rhythmic to avoid the massiveness that the creation of a block in one piece could have led. This architectural rhythm is also amplified just as much by the play of facades , mixing plastered surfaces and natural stone surfaces. The timeless character of the building is guaranteed by sober tones, which make the building warm and justify that contemporary shades such as black or white were not used.

The single-family house is made up of several levels, including a basement, a ground floor and two floors. The comfort of the inhabitants is reinforced by the large bay windows offering an impression of inside-outside and guaranteeing optimal contributions of natural light.

In this desire to be part of an approach respectful of the environment , the large-sized stones, found in the ground at the start of the works, were preserved and reworked in order to include them completely in the landscape architecture but also used as retaining walls. The use of mineral materials and wood, was carried out both outside and inside the house to give it a family and cozy atmosphere .

Energy consumption

• Primary energy need : 31,00 kWhep/m².an
• Primary energy need for standard building : 45,00 kWhep/m².an

Calculation method : RGD du 30 novembre 2007 - bâtiment d'habitation

CEEB : 14

• Final Energy : 12,00 kWhef/m².an
Breakdown for energy consumption :

Heating: Primary energy: 15.53 KWHEP / M2.AN Final energy: 5.84 KWHEF / M2.AN Sanitary hot water: Primary energy: 6.71 KWHEP / M2.AN Final energy: 2.52 KWHEF / M2.AN Auxiliaries and ventilation: Primary energy: 9.19 KWHEP / M2.AN Final energy: 3.46 KWHEF / M2.AN

More information :

The figures mentioned correspond to the building permit project.

Envelope performance

• Building Compactness Coefficient : 0,47

Indicator : EN 13829 - n50 » (en 1/h-1)

• Air Tightness Value : 0,60

Systems

Heating system :
• Geothermal heat pump
Hot water system :
• Heat pump
• Solar Thermal
Cooling system :
• Geothermal heat pump
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Solar Thermal
• Heat Pump on geothermal probes
• Renewable energy production : 22,00 %

Photovoltaic panels (22,000 kWh / year)
3 thermal solar panels with empty tubes

Smart Building

BMS :

The house is equipped with micro-perforated blinds. In summer, these let in just the right amount of natural light to illuminate the room, while rejecting most of the sun's rays during the day, and automatically open after dark to let the heat sink in. clear out.
In winter, the blinds close completely at night to conserve the heat of the day. The use of solar energy is maximized, both to light the rooms and to heat them.

The building also has a fully connected home automation system, making it possible to optimize the regulation of the building and thus avoid energy losses.

GHG emissions

• GHG in use : 7,70 KgCO₂/m²/an
Methodology used :

Linked to the Energy Performance Certificate

Life Cycle Analysis

Developed in-house at Leko Labs

Eco-design material :

The LCA diagram is part of a logic of cradle to cradle certification . Positive carbon footprint, the structural part allows more storage than GHG emissions.

Water management

Rainwater collection via 2 cisterns (one on the garden side and one on the street side)

Indoor Air quality

Permanent controlled mechanical ventilation

Air quality: class 2 according to DIN EN 16798-1

Comfort

Health & comfort :

One of the advantages of the Leko superstructure is the use of up to 10 times less glue and the naturally strong, untreated wood material. In addition, the single-family house has bio-sourced insulation, that is to say without mineral wool, avoiding the inconvenience associated with it.

Calculated indoor CO2 concentration :

< 1250 ppm donc classe 2

Calculated thermal comfort : Certificat de Performance Energétique et Simulations Thermiques Dynamiques

Product

Leko Labs wooden superstructure



Leko Labs

[email protected]

 https://www.lekolabs.com/


Product category : Gros œuvre / Structure, maçonnerie, façade

The wooden solution offered by the manufacturer Leko Labs has many advantages for new construction compared to more traditional methods. Based on the assumption that 2/3 of the world's population will live in cities and that concrete is one of the most polluting elements today, the company offers a rapid, efficient and ecological construction system.
In fact, the construction time with the Leko Labs superstructure is cut in half and can be used for any construction.

LEKO Labs has indeed developed a highly automated means of prefabrication which revolutionizes the way of approaching low carbon construction. Using software, they translate an architect's plans into a "LEKO Superstructure" in just a few minutes. Each wall of the digital model is represented by a data package which is then transmitted to an automated production line, at the heart of which the parts will be shaped and then assembled by robots to form the walls. All that remains is to assemble them on site. Greener houses, recyclable, positive carbon footprint, produced in a very short timeframe, this innovation clearly opens up the possibilities.

LEKO Labs is working with Betic Consulting Engineers on this project so that special techniques are also integrated into the process. In the long term, the openings, the passages, the dimensions will be automatically calculated on the basis of the technical drawings provided by the technical engineering offices to be integrated into the production.

Urban environment

Confidential

Land plot area

Land plot area : 1 063,00 m²

Built-up area

Built-up area : 36,00 %

Green space

Green space : 366,00

Parking spaces

1st basement: 5 parking spaces for cars
Ground floor: 2 parking spaces for cars

Building Environmental Quality

• consultation - cooperation
• comfort (visual, olfactive, thermal)
• energy efficiency
• renewable energies
• building end of life management
• building process
• products and materials