Rakuunantie - extension storey to an apprtment block

Rakuunantie extention storey

Location Finland
Building Year 2016
Architect Architecture design: Minna Lukander ( Talli Oy), drafting phase: Karoliina Hoppu, main drawing phase: Kati Murtola, work drawing phase and construction site project architect: Jukka Sulonen
Structural Design Jyrki Pulkki, Ilpo Hyvärinen (Kiratek Oy)
Constructor Asuntoverstas Attic Fund / Samuel Tuomola
Products Used Kerto LVL
Type Residential Buildings And Gardens

Apartment block extention with Kerto® LVL (laminated veneer lumber)

​Challenge

The planning of an additional storey for an apartment block  was initiated by the housing company. Considerations were the need to finance pipe repairs as well as a synergy benefit in timing.
Rakuunantie is located in a culturally and historically valuable area of stylistically coherent architecture built in the 1950s and 1960s . Apartment blocks along the street have been classified as culturally and historically valuable,  The city’s stance on further construction was favorable, following its strategy of more compact housing.

Solution

The existing building did not have an actual attic space, and the space between the upper  and lower roof structures was too low to allow for building lofts. Instead, expansion was achieved by adding a storey.  In the solution chosen, the floor area of the flats is retracted  from the long facade lines and there is a long, open terrace at the front of the flats. The old mansard roof was demolished, and its edges around the additional storey and eaves were built according to the old model.

Metsä Wood Kerto LVL (laminated veneer lumber) roof elements were used in this project. Kerto LVL elements enabled the main frames in a smaller size and lighter foundation and short erection time.

Result

The additional storey has six new flats, two off each stairwell. The new flats are two-room floor-through flats, with larger three-room flats at the ends that have views in three directions.

References related to extension building

  • De Karel Doorman – 16 floors extension

  • Rakuunantie extention storey

  • Cockfield Windmill – conversion to accommodation using Kerto® LVL

  • Extension to a building in Paris

Search all references

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