Renovation of an Office Building with Prefabricated Wooden Element—Case Hedensbyn
There is a major need of cost-effective renovation that leads to lower energy consumption and better environment. This article shows the results from a pilot case of a newly developed prefabricated building system. It is an industrially prefabricated insulated wooden element adapted to renovation and upgrading of building envelopes. The renovated building is a one-story office building located in Skellefteå in the north of Sweden. Energy performance, thermal bridges, risk of moisture problems, LCA, applicability of the renovation method and assembly time were evaluated during the planning and execution of the renovation. Results from this case show that the elements were very light and easy for one person to handle at the building site. There is a great potential to reduce assembly time with improved joints and element sizes adapted to the building as well as improved batch packaging from the factory. With 100 mm insulation, the renovation gives a certain energy savings, and LCA calculations show that the reduction of climate impact due to reduced heating energy used during a service life 50 years corresponds to the climate impact of the renovation measures. The risk of microbial growth can be regarded as small.
KeywordsFaçade renovation Building envelope Prefabricated wood element Energy efficiency Thermal bridge Insulation Climate impact Retrofitting
This paper was written within the project, Nordic Built Concept for renovation and upgrading of residential buildings, supported by Nordic Built, Swedish Energy Agency, The Swedish Research Council Formas and industry partners from Sweden, Norway and Finland. The work with “Case Hedensbyn” was also supported by Nordic Renovation Center, a project financed by an EU Interreg program with participants from Sweden, Norway and Finland to exchange best praxis and information on renovation.
- 1.International Energy Outlook 2017, report number DOE/EIA 0484 September 2017 Issued by International Energy AgencyGoogle Scholar
- 2.EU Commission, in Clean Energy For All Europeans—Energy Efficiency Directives, (11 2016), pp. 4–6Google Scholar
- 4.Swedish Energy Agency, Energy in Sweden 2017, ET2017:12, (2017) p. 9Google Scholar
- 5.The Swedish Research Council Formas, in SB11 Helsinki—World Sustainable Building Conference, ed. by G. Bergström, U. Save-Öfverholm, Comprehensive knowledge of building and housing (2011) p. 19Google Scholar
- 6.TES Energy Façade, www.tesenergyfacade.com/, 19 August 2016
- 7.Smart TES, www.tesenergyfacade.com/index.php?id=14_smarttes, 19 August 2016
- 11.EPD TermoElement, 2016, www.epd-norge.no
- 12.EN15804:2012 + A1:2013 Sustainability of construction works—environmental product declarations—core rules for the product category of construction products, 2013Google Scholar
- 13.M. Wikner, Z. Holmstedt, in Utvärdering av renoveringssystem för ytterväggar (Evaluation of refurbishment system for external walls) (in Swedish), B.Sc. Thesis—Energy Engineering, Dep. of Applied Physics and Electronics, Umeå University, SwedenGoogle Scholar
- 14.P. Blom, in Termowood elementer, SINTEF Rapport no SBF2015F0287(in Norwegian), 16 June 2015Google Scholar