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New insulation product helps energy-saving renovation project in Norway achieve its ambitious goal. Reductions in heat loss will outweigh the project's higher building costs over time.

ROCKWOOL responsibles

AS ROCKWOOL
Gjerdrums vei 19,
Pb 4215 Nydalen,
NO - 0401 OSLO

Phone: +47 22 02 40 00

Main developer

Myhrerenga

Contractors

Agaton Borgen

Architects

Arkitektskap AS v/ Ingvild Røsholt

Project Consultancy

SINTEF Byggforsk

Renovation of the Myhrerenga housing complex in Skedsmokorset near Oslo had two chief aims: to ensure all future energy came from solar collectors and heat pumps, and to minimise heat loss from the apartments through optimised insulation. New tile façades and 20 cm of insulation was therefore added to the seven low-rise blocks containing 168 apartments, with the aim of sealing out cold air and moisture.

The walls were insulated using ROCKWOOL FLEXSSYSTEM, which ensures airtight joins and avoids notorious thermal bridges. ROCKWOOL Granulate PRO was also used as cost-effective insulation for ceilings and roofs.

Rune Olsen from Agaton Borgen had not used this type of insulation before, but was very happy with its flexibility: "There were a few challenges initially around the windows. But as with any new product, we just needed a little time to get used to the system. Overall it was extremely easy to work with, and the insulation was airtight and high performing.


2.1 million KWh saving
SINTEF, the largest independent building research institute in Scandinavia, reports that several international studies have shown that improving energy efficiency is the simplest and cheapest climate initiative. Germany and Austria have been leading the way in renovations based on the passive building model. SINTEF therefore argues for a greater focus in the Scandinavian building sector on upgrading to lower energy consumption in connection with renovation work - much like the Myhrerenga project, which will be economic in the longer term. The construction costs were significantly higher than would be the case for normal façade renovation, but these will be outweighed in time by the energy savings associated with heating and hot water.

The annual energy consumption of 275 kWh/m2 is expected to be reduced to 80 kWh/m2 - a saving of 70%. In addition to saving 2.1 million KWh per year, Myhrerenga will now enjoy an improved indoor climate and more durable, low-maintenance façades.


The annual energy consumption of 275 kWh/m2 will be reduced to 80 kWh/m2 - an impressive saving of 70%.