Moja, the low energy house, a Rockwool and YTONG collaboration
Design
The house was designed as a low energy house, a simple cube with different technical solutions to bring the energy consumption down.
Technical Solution
The house has few openings on external walls without many extensions. The architect developed a design using the following simple solutions;
- A simple design of the house, where the dwelling and the service room are separated
- The dwelling is located on the south with large windows
- Service part of the building is positioned to the north with a minimal number of openings on external walls
- Sliding wooden roll-ups were installed on the south side windows to prevent summer overheating,
- The positioning of the building's longitudinal axis on the land was East-West, with a max. declination of ± 30°
- The house was built completely with YTONG® aerated autoclaved elements
- Triple-glazed windows with Krypton noble-gas fill were installed.
YTONG® building elements
Aerated autoclaved concrete YTONG® is a homogenous building material. It has a very good performance in terms of fire safety, thermal conductivity and acoustic absorption. The lambda value of YTONG® is 0,12 W/(mK), which enables us to optimise the additional thermal shield on the walls, depending on it's orientation.
Basic building element of the external wall was chosen as a 40 cm thick block and the inner bearing walls were made of 25 cm blocks. The installed partitions were built of 15 cm blocks. The building frame was designed in accordance to the EC Earthquake Regulation Nr.6.
The air tightness of the building was achieved by using a fine full-surface mortar bed on all the block joints. External wall surface was coated with an additional fine plaster. Special sealing tapes were also used for the installation of window frames.
External wall and roof insulation with ROCKWOOL products
On the external walls of the Moja house, Rockwool lamella board, called Fasrock L was used as part of the ETICS. The insulation thickness differed depending on the wall orientation. South facade was insulated with 80 mm thick slabs, while the north one used 150 mm. External walls were than covered with wooden Formwork, which was the reason for thickness variation.
Rockwool Rockfloor was also used in the atic and Rockwool Multirock was used for insulating the roof space of the property over standard prefabricated YTONG® deck elements.
Rockwool was chosen for its unrivalled sustainability credentials, thermal performance and durability and to create a good indoor climate, low heat consumption and stable temperatures throughout the building
House before Fasrock L installation
House in a process of putting Fasrock L insulation 
House in a process of applying top mortar 
House with a finished thermal insulating facade system 
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