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The ModernaHus concept halves construction time, reduces construction costs and consumes at least 30 percent less energy. The concept is a success and Skanska has now constructed Sweden’s first ModernaHus building in Västervik with tenant-owned apartments.
ModernaHus is a new and slightly different method for constructing residential buildings. The construction technology is safe, green …and fast! Instead of constructing the buildings on site, the framework and facade are cast in Skanska’s plants in Strängnäs and Bollebygd to save time and ensure quality. The completed construction elements are then delivered to the site where they are assembled.
The total execution period is about 7-8 months. A ModernaHus building is constructed in about half the time it takes to construct a traditional building.
ModernaHus buildings are available in six different formats. “Önneby” was chosen in Västervik, with five floors and 22 tenant-owner apartments. The apartments are bright with open floor plans and large balconies.
From 2009, all ModernaHus have been certified in accordance with Skanska’s “Green worksite” environmental marking system. This entails standards such as strict emission requirements for machinery, energy-efficient lighting, and a stricter application of chemical and waste management requirements than those imposed by law.
Johan JohansenSkanska Sweden+46 10 44 86 197
Mejl Johan Johansen
Marknadssegment: Apartment buildings
The ModernaHus concept is already green and energy-efficient by its basic design.
One of the secrets behind the low energy consumption is a well-insulated building envelope with minimized thermal bridges and recycled exhaust air. The building’s technological solutions also create a pleasant indoor environment, and only approved materials and material combinations have been used to achieve high indoor air quality and climate comfort.
The success of Skanska’s ModernaHus concept is mainly due to the combination and standardization of the most well-tried and best solutions. Energy-efficiency measurements of completed ModernaHus have shown that deviations between our calculations and measured values are a maximum of 2 percent.
The criteria for Nordic Ecolabeled residential buildings were released in December 2009. We expect ModernaHus to be the first Ecolabeled residential building in the market.
Skanska’s ModernaHus is a proprietary project and focuses on prefabricated construction. The concept is flexible and can be adapted to a range of settings.
The objective of the project is to minimize construction costs, reduce construction time, raise quality and enable lower lifecycle costs.
The concept is based on innovative solutions and a high degree of prefabrication, entailing that volume elements, like pieces of Lego, are constructed in plants and then assembled at the construction site.
The project prerequisites for the Tändstickan block were excellent. Skanska owned the land, had already constructed four adjacent buildings, the detailed development plan was complete and the waterside location could hardly be more ideal.
The framework and facades for the building in Västervik were manufactured in our Strängnäs plant. The completed construction elements were then transported to Västervik for assembly. Assembly consisted of three separate phases.
In Phase 1, the land phase, the foundation is laid. The prefab foundation is assembled with partly cast-in-place concrete. This takes about 6-8 weeks.
Phase 2, the framework phase, is the process that most differentiates ModernaHus construction from that of traditional buildings. Assembling the framework is extremely fast and only requires a few fitters. The prefab framework and other installations such as bathrooms and steps are assembled in this phase.
The framework phase includes a tight ceiling. This phase took very little time in Västervik, where around ten fitters assembled the framework in just 29 days. The standard period for a building with eight floors is six to eight weeks but with fewer floors, Tändstickan could be assembled much faster.
The dry phase is the third and final stage. This phase is also faster than traditional construction due to the high degree of prefabrication and because many activities have already been completed during the framework phase. The dry phase takes about 16 weeks, including drying, which takes about 50-60 days.
The total execution period for ModernaHus construction is about 7-8 months.
One tenant-owner building with 22 apartments, halved construction time and a total execution period of 7-8 months: 6-8 weeks for the land phase, 6-8 weeks for the framework phase and 16 weeks for the dry phase.