ELUMAJA
Architecture
elumaja 133 is a healthy energy efficient two-storey building with five rooms and two bathrooms.
The first floor accommodates a southward facing kitchen-living room (34.5 m²) whereas the two can be separated from each other with a wall. Also on the first floor, are the toilet, the shower room, the sauna and an extra room (14.10 m²) that opens to the south terrace and can be used as the sauna hall, hobby room, guest room or a home gym.
The windows of the second floor bedrooms (16.00m²+17.50m²+17.5m²) face south. Each room has an openable window of 0.9 m of width that can also be fixed into venting position. The second floor also houses the second bathroom with a shower or a bath. For exterior finishing vertical shading or plaster can be used. Options for the roof include a flat, gable or single-pitched roof.
Technical info:
Length: 10.9 m
Width: 7.9 m
Minimal height: 6.9m
Neto area: 133 m²
Bruto area: 171m²
Volume: 332 m³
Exterior finishing
The choices for outer finishing are wood and plaster. In case of double air cavity we usually prefer vertical tar oil processed wood planks that ensure a natural, long lasting outcome which ages with dignity.
If plaster finishing is required, it can be used on top of wool plates covering the air cavities.
Technology
The planned heat load is 18 kWh/(m2a). The calculated energy use is below 65 kWh/(m2a). Energy class A. Efficiency in energy use is accomplished with an insulated (thermal transmittance can reach up to 0.069 W/m2K) and air tight (envelope tightness is 50 to 0.2 1/h) envelope. Heat and hot water needs are covered by a ground source heat pump which is connected also to a heat recovery ventilation system, whereas both of them can be linked to solar panels as well.
The house is heated with water radiators. A fireplace-oven using exterior air can be installed for extra heating. The heat recovery ventilation system is controlled by humidity and CO2 sensors that calculate the real need of fresh air considering the number of people in the room and minimise over-drying during the heating period.
Thanks to ventilation it is possible to cool the rooms with a bypass in summer.
Interior finishing
For the interior finishing, low health risk materials have been used. The base for interior finishing is cross laminated timber that we suggest to cover with a wood oil that would not hide the texture of the wood, but would decrease appearance of micro fractions from drying. Dry room floors are oiled with floor oil or covered with a parquet. Wet floors and walls are tiled.
Constructions
The house is constructed in a factory in three finished modules that are later transported to the plot and mounted on-sight. This secures best possible construction quality and price. The envelope is a double carcass wooden framework supported by cross laminated timber panels (CLT) in the inner layer.
Dold cross laminated timber panels have the perfect size (2.5*5 m) and they can be used both for structure where they help to support the whole building and for interior finishing as well. Plus, they make the envelope air tight while allowing the water vapour to pass through it.
Wood is a renewable ecological material that ages with dignity and is safe and easy to exploit when the life cycle of the house comes to an end. The benefits of the double carcass are that there are no thermal bridges in the entire perimeter and the thickness of insulation can be chosen depending on climate circumstances and energy demands.
We normally use 600 mm of celluwool for insulation. Using celluwool eliminates the need for vapor barrier, which decreases the risk of humidity and health damage in the future. The slab and partitions also have a double carcass which, together with the mineral wool boards ensure maximum sound isolation. The house is placed on a post foundation. Using a post foundation avoids excessive greenery works later.
The openable windows and doors are triple-glazed thermal break frame windows from Viking Windows. To further decrease energy loss from the linear thermal bridges, all non-opening windows are resolved with placing the glass directly into the carcass.