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.
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.