Minitalo (Tiny house) “Tupla” (“Double”)
A two square meter test building for ecological and compact construction, space for short-term accomodation and working
The project was initiated by Dodo’s Urban planning and living group in the Urban Action Day of spring 2016. It was a proof of concept that citizens could build their own tiny house, although some of the designers and builders had previous knowledge and experience.
It was based on architecture Master’s thesis concept, but scaled down to 1:2 as a result of limited budget, skills, time and space constraints.
It was originally meant to be portable and to be kept only indoors, but later it was gradually enlarged and moved outside.
- Preferred recycled, organic, chemical free materials and hygroscopic minimal risk structures. Cost-efficiency was also an important factor.
- Main structure made of 2×2 and 2×4 timber.
- Hunton wood-fiber insulation, 5 cm thickness.
- Wind protection boards, 12 mm thickness.
- Wood panel facades with Osmocolor Organowood protection treatment.
- Extensive variable (5-15 cm) thickness green roof with sedum on the sides, meadow in the center and strawberry on the lower edge.
- Multiple layer construction: growing medium, filter layer, drainage layer, moisture retardation layer, root protection layer, waterproofing, bitumen roofing, wood roofing.
- Growing medium comprised of green roof soil, biochar and volcanic stone.
- Actively watered using drip irrigation system run by solar and wind powered 12 V timed pumps. 220 liter water tank under the floor, rainwater collection from roofs.
- First year was a success regardless of the hot and dry summer. No maintenance or replanting was needed after the winter. Even the strawberries survived!
- InnoGreen modular green wall system with various herbs.
- Actively watered using pipes run by solar and wind powered 12 V timed pumps. 220 liter water tank under the floor, rainwater collection from roofs.
- First year was a success regardless of the hot and dry summer. The green wall was replanted after winter, because most of its plants were annual anyway.
- Thermostat controlled electric heated clay floor using solar and wind power.
- Passive solar energy utilization.
Interior (work in progress)
- Plywood walls.
- Foldable sofa bed and desk.
- Double windows. Largest window area to the south and west to maximize solar gain.
- South facing brick wall provides thermal mass in addition to the clay floor.
Electronics (work in progress)
- Solar-powered 12 volt electric system with USB outlets. Total 1 kW combined power available from Kääntöpöytä solar panels and wind turbine and additional 100 W from own solar panel.
- Adjustable RGB LED-lightning, adjustable active ventilation system, sensor system and remote control.
- Original design: Anu Säilynoja
- Main builders and modified design: Petri Kangassalo, Sauli Kinnunen, Leino Kuuluvainen, Lauri Lundahl
- Additional builders: Afrizal, Enrica Perotti, Theodor Schönberg, Anu Säilynoja, Ari Virtanen
- Insulation material: Hunton
- Facade treatment material: Osmocolor
- Heated clay floor: Leino Kuuluvainen, Natural Building Company
- Green wall modules: InnoGreen
- Plants: InnoGreen, Eija Leinonen
- Schematics: Enrica Perotti, Lauri Lundahl, Anu Säilynoja
- 3d model: Lauri Lundahl, Petri Kangassalo
- Material transport: Kirmo Kivelä, Sami Soininen
- Web site: Petri Kangassalo, Kirmo Kivelä