By Eveliina Sarapää & Karoliina Hartiala (ARKK Sarapää)
Helsinki is growing fast. While all efforts are being made in Helsinki to build more housing, the demand has been greater than the supply for a number of years. The old wooden town Porvoo is situated within commuting distance from Helsinki, and the pressure to provide new housing is felt there, too.
Marski, situated in the center of Porvoo, is a 50’s built 2-3-storey commercial building. It houses a number of uses ranging from supermarket to dance studio and locksmith to restaurant. While the ground floor should and will stay as an active urban streetfront, the upper floors and the rooftop have potential for new housing.
Marski proposes the creation of an urban apple garden on top of the commercial building. By taking the feel of the summer villa and bringing it to the city we can offer the best of both worlds: your own garden in the middle of urban amenities. Public transport is near, so commuters won’t need to drive to work. The new rooftop village has references in old wooden Porvoo, creating a recogniseable Porvoo feel.
The existing slanting roof structure will be demolished and a new straightened Kerto-beam roof slab will be built so the current attic becomes a full-height space for loft apartments. The beam structure of the slab reduces material use to a minimum and reduces the overall weight of the slab - crucial when building on top of an old building. Modular lvl-built small villas will be lifted on top of the new roof. The rooftop modules can be almost entirely prefabricated, causing minimal disruption to the existing users of the building.
The façade material of the existing building is light grey render. The extension will have a wide wooden panel façade, which will turn grey within time. The use of material will distinguish between the new and the old. The extension will be slightly set back from the existing wall, creating a natural break point between the old and the new.
Access to the roof will be provided by extending the existing stair to the roof and building an additional stair and a new lift next to the building. The existing drainage system has enough capacity to facilitate new additions.