risør technical college

RISØR TECHNICAL
COLLEGE
The school is a Norwegian pilot project under the international research
project TES EnergyFacade, which aims at developing a method for the energetic modernisation of the building envelope, based on woodframed prefabricated facade elements. Risør Technical College was retrofitted with new
facades and improved roof insulation in the project period 01.01.2008 to
31.12.2010. The heat energy demand for the school building was reduced
from 325 kWh/m2a to 49 kWh/m2a, a saving in energy use of 275 kWh/m2a.
Co-funded by the Intelligent Energy Europe
Programme of the European Union
GENERAL INFORMATION
Location: Risør, Norway
Project type:
Renovation
Net cost:
14,8 million EURO
Main contractor:
Trebyggeriet AS
Architect:
Arkitektstudio AS
Building owner:
Aust-Agder County Counsil
Gross floor area:
3 086 m2
Number of stories:
2 (main building) and
1 (wing with classrooms)
Construction time:
Jan. 2008 Aug.2009
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COOPERATION MODEL
A pilot project in the international research project TES
EnergyFacade (www.tesenergyfacade.com). The partners
consisted of the technical universities in München, Helsinki
and Trondheim (NTNU - Faculty of Architecture and Fine
Art). Industrial partners from all three countries were also
included.
Trebryggeriet AS, which produced the facades, was invited
in as an industrial partner in this project. Arkitektstudio AS
was hired as an external research partner and was responsible for the design.
The pilot project was financed by the Aust-Agder County
Counsil.
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TECHNICAL SOLUTIONS AT A GLANCE
•
•
Dramatically improved energy performance of the
school building
Prefabricated timber facade
ENERGY DATA / SUPPLY
Due to the renovation of the facade and roof, the heating
demand for the school building was reduced from 325
kWh/m2a to 49 kWh/m2a, a saving in energy use of
275 kWh/m2a.
Picture1 Risør Technical College before renovation
Picture 2 Risør Technical College after renovation
Picture 3 Cross section of the prefabricated facade mounted to the excisting concrete foundations
Picture 4 From the production of the facade elements
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Co-funded by the Intelligent Energy Europe
Programme of the European Union
DESCRIPTION OF CONSTRUCTION
The new walls are designed as a timber structure with an
outer cladding of 21 mm thick spruce boards
(Picea abies) and an inner cladding of 22 mm OSB
boards.
The basic element consists of two parts:
- an inner part with the OSB board fixed to a 96 mm
thick timber frame filled with mineral wool insulation.
- an outer part with a 198 mm thick timber frame that
was filled with wood fiber insulation and then assembled. In addition it has a 12 mm OSB board on the inside,
and on the outside an 18 mm impregnated wood fiber
board, 48 mm vertical slats for ventilation and 48 mm
horizontal slats fixed to these which serve as the basis
for the external vertical boards.
This part rests on steel brackets fixed to the concrete
foundations and is connected to the inner part with
screws.
Between the two parts there is a «tolerance gap» filled
with mineral wool insulation.
The total thickness of the wall is 500 mm, and the new
U-value is 0,13 W/m2K.
The insulation in the roof was in addition improved
by blowing mineral wool fiber into the existing timber
frame roof structure.
FABRICATION OF THE FACADE
The elements were fabricated in the controlled environment of the Trebyggeriet Company.
The element left the factory complete (with windows
mounted, external cladding pretreated with mineral
paint, and wrapped in plastic foil) and was transported
by truck to the site, where the truck’s crane was used
for assembling.
The entire process was extremely smooth, leading to
only a minor disruption of the school’s daily activities.
LESSONS LEARNED
When creating the model for the facades, data was extracted from the architect’s model and brought into the
fabrication model.
The reason for this is that the fabricator feels that in
order to have a complete understanding of the project,
it is necessary for them to build their own digital model.
In their opinion, this is the only way to ensure the
technical quality of the project based on their detailed
knowledge of the structure.
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Overall, by using prefabricated facades, the renovation
costs were more predictable, the construction work on
site was considerably shorter. The building envelope
can also easily be up-graded using different cladding
materials and integrated components.
THE RENEW SCHOOL PROJECT WILL DISPLAY 18 RENOVATED OR NEW
SCHOOL BUILDINGS ALL OVER EUROPE
The RENEW SCHOOL project aims at retrofitting a large number of school buildings to Nearly Zero Energy Building (nZEB)
standard. The project will promote and increase high-energy performance and prefabricated timber-based renovation of
school buildings in Europe.
The project assists municipalities, school owners/-financiers and companies with appropriate tools and solutions and offers
exchange possibilities for them.
Integrated and multifunctional solutions are based on:
•
Timber prefabrication (with integrated facilities)
•
Ventilation (indoor air quality)
•
Intelligent daylight / shading (control)
•
Renewables (on-site or nearby)
The project has chosen 18 frontrunner buildings, presenting them to municipalities, school owners, companies and users as
good examples and solutions for the renovation of existing school buildings to fully nZEB standard.
1. Romsdal Secondary School
2. Søreide Primary School
3. Risør Technical College
4. Backsippans Preschool
5. School CVO Heusden-Zolder
6. Detmold Vocational College
7. Gymnasium Reutershagen
8. Schwanenstadt
9. Rainbach
10. Neumarkt
11. St.Leonard
12. Tišina kindergarten
13. Lavrica kindergarten
14. Kekec kindergarten
15. Storžek kindergarten
16. Siemianowice
17. Vibeengen
18. Capriva del Friuli kindergarten
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CONTACT INFORMATION:
Karen Bruusgaard, Asplan Viak AS
(karen.bruusgaard@asplanviak.no, +47 970 99 234)
Armin Knotzer, AEE INTEC (a.knotzer@aee.at, +43-3112-5886-369)
- Coordination Renew School
Follow us on www.renew-school.eu
The sole responsibility for the content of this folder lies with the authors. It does not necessarily reflect the opinion of the European Union. Neither the EASME
nor the European Commission are responsible for any use that may be made of the information contained therein.
Co-funded by the Intelligent Energy Europe
Programme of the European Union