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In addition to achieving excellent indoor climate and acoustic comfort, a Swedish construction project using a new insulation system exceeded the energy requirements of the Swedish Forum for Energy Efficient Buildings (FEBY) for passive buildings.

*(ro-en) project_rw_responsible*

ROCKWOOL AB
Kompanigatan 5
SE-550 11
Jönköping
Sweden

Phone: +46 36 570 52 00

*(ro-en) project_developer*

Afab Bygg Henrik Thoren

*(ro-en) project_contractor*

Afab Bygg

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Bjerking AB Uppsala,

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www.afabbygg.se
www.bjerking.se
www.rockwool.se

Henrik Thorén of Thorén Byggproduktion AB is an ambitious man, which he demonstrated when asked to build new condominiums at Sunnersta in Uppsala. "We saw great advantages in building the new apartments with the lowest possible energy emissions, and why not surpass the criteria for passive buildings? It was a good opportunity to build the first building of this type in the area."

To achieve passive building certification, the power requirement for heating must not exceed 10 W/m2. The building in Sunnersta achieved a power requirement of 9.4 W/m2 and an outside energy need of 22 kWh/m2 per year. Fulfilling these strict requirements demands efficient technical equipment. But according to Henrik, the most important factor is to reduce heat loss through the climate shield.

"In league with ROCKWOOL we worked out intelligent and efficient solutions for the exterior walls and roof, and even the internal structures adjacent to the colder outer rooms," he says.


Many advantages
The apartments at Uppsala have stone wool lining the wall exteriors and interiors and the roof. In consultation with ROCKWOOL, construction solutions were chosen which fulfil requirements for fire safety, acoustic comfort and sound transfer between apartments. "We chose FLEXSYSTEM and FlexiBatts because the system and product offered many advantages," explains Henrik. "We saw the products as very efficient to work with. They also exceeded our heat insulation and fire safety requirements, and FLEXSYSTEM provided flexible façade cladding options."

As a result, the building's façade which is primarily rendered, was combined in places with horizontal wooden panels, improving the visual appeal of the entire building.

"The extensive, flexible layer of insulation on the outside keeps the organic structural components ever warm and dry, minimising the risk of humidity problems which can impact on indoor climate and structural integrity in the longer term," says Henrik Thorén.


"We saw the products as very efficient to work with and they also exceeded our technical requirements."
Henrik Thorén, Thorén Byggproduktion AB.