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Building Information Modeling/ Virtual Design & Construction
Skanska has constructed one of Sweden’s first Nordic Ecolabled residential buildings in the Stationsmästaren block in central Söderköping. The building was constructed under Skanska’s ModernaHus concept which halved the construction time, decreased construction costs and reduced energy consumption by 25 percent. The concept was the first in the Nordic region to receive a Ecolabel license.
Ecolabeling means that the building meets a series of rigorous environmental requirements, including low energy consumption and low environmental impact.
The Stationsmästaren block was built following the ModernaHus construction process. Instead of constructing the building on site, the framework and façade were cast in Skanska’s plant in Strängnäs, which meant that the building was completed in record time.
The turf-cutting ceremony took place in May 2011, the building was completed in January 2012 and the first tenants moved into the climate-smart apartments in February. Each apartment is equipped with water saving toilets and taps and energy labeled appliances. The apartments also have individual meters for household electricity, heating and hot water, which means that the residents can influence their energy consumption themselves.
Marknadssegment: Apartment buildings
Sustainable and environmentally adapted construction processes are often high on property owners’ agendas. ModernaHus’s energy consumption is between 25 and 50-percent lower compared with the levels prescribed by the Swedish National Board of Housing, Building and Planning’s Construction Standards.
Environmental and sustainable development were key elements of the project of constructing the Stationsmästaren block. The residential building’s Nordic Ecolabel means that it has low energy consumption and environmental impact. Furthermore, it means that the building is constructed with the most environmentally friendly materials available on the market. Detailed operating and maintenance plans must also be in place that make it easy to ensure that the environmental impact of the building remains low in terms of energy consumption.
The Ecolabeled building was constructed under Skanska’s own ecolabel entitled “Green Workplace,” which means that the environmental ambitions are higher than Skanska’s standard requirements and the workplace has to meet a number of criteria. For example, at least 95 percent of waste must be reused or recycled, energy efficient lighting must be used and only Ecolabeled kitchen, hygiene and cleaning chemicals may be used.
However, it is not only during the construction process that a focus on sustainability is important. Once the building has been constructed, there are many climate-smart benefits that the residents can enjoy. For instance, Nordic Ecolabled buildings must be equipped with water saving toilets and taps, only energy labeled appliances are permitted and good ventilation is an essential feature. Each apartment also has individual meters so that the residents can have full control of and influence and reduce their energy consumption.
Skanska was contracted by municipal housing company Ramunderstaden to construct an Ecolabeled four-story building containing 16 rental apartments in Söderköping. The building is Skanska’s first Ecolabeled residential building. The building, which was constructed under the ModernaHus concept, is highly energy efficient, has a low environmental impact and uses materials that contain as few environmentally harmful substances and substances that are hazardous to health as possible.
ModernaHus focuses on efficient and industrialized construction and offers a shorter project planning and construction period compared with traditional construction projects. Skanska was the first in the Nordic region to receive an Ecolabel license for residential buildings under the ModernaHus concept.
Instead of constructing the building on site, the framework and façade are cast in Skanska’s plant in Strängnäs. Other parts of the building, such as the bathroom, windows, ducts for electric cables and junction boxes for power points and circuit breakers are prefabricated at the plant, all to enhance the efficiency of the construction process. Once the prefabricated parts are completed, they are transported to the site where they are assembled. Traditional foundation work must be performed before the actual module assemble stage. The land conditions in Söderköping were difficult and a 39-meter bore depth, 50 holes and 150 piles were needed to create a very stable foundation.
After the foundation was laid, work on the structure began. The first prefabricated framework parts and façades were delivered to the construction site in August. Once on site the framework parts were assembled, rather like a large Lego set. Assembly of an entire floor could be done as quickly as in two and a half days.
But it is not only the quick assembly process that makes ModernaHus so successful. The heating can be turned on as soon as the roof is in place. The rapid assembly process also means that exposure to damp and moisture is minimal compared with a normal construction process. In Söderköping, the drying process was significantly shortened compared with a traditional construction process and neither construction fans nor current were needed.
The dry phase can start as soon as the roof has been assembled. This phase involves the assembly of interior walls, painting, floor-laying and building the kitchen.
Another advantage of ModernaHus is that the construction site is kept clean and structured. Waste is also markedly reduced and the amount of material that needs to be transported to a landfill is minimal.
With the shorter project and construction time, the property owner can also start generating income more quickly. In addition, ModernaHus’s energy consumption is between 25 and 50-percent lower compared with the levels prescribed by the Swedish National Board of Housing, Building and Planning’s Construction Standards.