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2 Oaks House / OBIA

© Georgi Ivanov

Architects: OBIA
Location: Sofia, Bulgaria
Architects In Charge: Nikolay Ostrev, Vladislav Ignatov
Area: 475 sqm
Year: 2012
Photographs: Georgi Ivanov, Alumina Elit

Design Team: Nikolay Ostrev, Vladislav Ignatov, Slavin Baylov, Boriana Kostova, Georgi Kostov

Ground Floor Plan

From the architect. The house is located in a low-rise residential area near Sofia, in the outskirts of Mountain Vitosha. The project was preliminary defined as a contemporary house with rational spaces, very high energy efficiency and indoor climate comfort, fully controlled by a building automation system.

© Georgi Ivanov

Main challenge of the design was the preservation of the two existing old oaks and their integration in the spaces of the house. The trees create a natural micro-climate and function as a living element in the composition. The accent in the design concept was defining the space around them. On one hand the house has to be wide-open towards the tree crowns and the yard and on the other was the desire to emphasize on a certain shell or an envelope – explicit and yet very light and airy…, like a paper. Thus appeared the leading concept – taking the „paper theme” with the inherent property of folding.

© Alumina Elit

The factors that determine the shape of the building are the two trees, and one of them is its spatial and functional focus. The living zone at the ground level is a single space U-shape, consisting of kitchen, dining room and living room, fully glazed and open towards the yard.

© Alumina Elit

Each half of the glazed tiles is a sliding element, so that when all elements are open in summer, the living area turns into covered terrace towards the yard. At this level are placed also the main entrance and a garage for two cars. At the upper level are situated two bedrooms, master bedroom and a small office. This second level is thoroughly glazed and open towards the trees so that being on it feels like a walk through the crowns on a covered wooden deck.

© Alumina Elit

Preserving the two existing trees plays a significant role for the thermal balance of the building with so much glazing of the volume. The oaks serve as a natural protection against overheating in summer, contributing to the geothermal cooling heat-pump system which charges the ground with excessive heat, pumped back during the winter season. When the leafs are fallen off in winter the low winter sun penetrates deep in the living spaces, charging the thermal mass in the floor slabs.

© Georgi Ivanov

The house is very energy efficient, it has low-temperature floor heating/cooling with a geothermal heat pump (deep boreholes), triple gas-filled glazing (Uw=1W/m2K), 20-16cm thick glass-wool thermal insulation on the opaque construction. There is also controlled ventilation system with high level of heat-recovery.

© Alumina Elit

The house has a full control building automation system allowing the user to manage from distance all parameters of the building systems as well as drawing statistics of the way the house and its energy is used over time.

2 Oaks House / OBIA © Georgi Ivanov
© Georgi Ivanov
2 Oaks House / OBIA © Georgi Ivanov
© Georgi Ivanov
2 Oaks House / OBIA © Alumina Elit
© Alumina Elit

2 Oaks House / OBIA © Alumina Elit
© Alumina Elit
2 Oaks House / OBIA © Alumina Elit
© Alumina Elit
2 Oaks House / OBIA © Georgi Ivanov
© Georgi Ivanov

2 Oaks House / OBIA © Alumina Elit
© Alumina Elit
2 Oaks House / OBIA © Georgi Ivanov
© Georgi Ivanov
2 Oaks House / OBIA © Georgi Ivanov
© Georgi Ivanov

2 Oaks House / OBIA © Alumina Elit
© Alumina Elit
2 Oaks House / OBIA © Alumina Elit
© Alumina Elit
2 Oaks House / OBIA © Alumina Elit
© Alumina Elit

2 Oaks House / OBIA Ground Floor Plan
Ground Floor Plan
2 Oaks House / OBIA First Floor Plan
First Floor Plan
2 Oaks House / OBIA Section Winter
Section Winter

2 Oaks House / OBIA Section Summer
Section Summer

Cite: "2 Oaks House / OBIA" 25 Feb 2014. ArchDaily. Accessed 25 Feb 2014. <http://www.archdaily.com/?p=479900>
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