Change search
ReferencesLink to record
Permanent link

Direct link
Passive crosslaminated timber buildings: Final report Cerbof-project no. 76
Dalarna University, School of Technology and Business Studies, Energy and Environmental Technology. (Energi, skog och byggd miljö)
Dalarna University, School of Technology and Business Studies, Construction.
Dalarna University, School of Technology and Business Studies, Construction.
Show others and affiliations
2013 (English)Report (Other academic)
Abstract [en]

In this project, Stora Enso’s newly developed building system has been further developed to allow building to the Swedish passive house standard for the Swedish climate. The building system is based on a building framework of CLT (Cross laminated timber) boards. The concept has been tested on a small test building. The experience gained from this test building has also been used for planning a larger building (two storeys with the option of a third storey) with passive house standard with this building system.

The main conclusions from the project are:

 It is possible to build airtight buildings with this technique without using traditional vapour barriers. Initial measurements show that this can be done without reaching critical humidity levels in the walls and roof, at least where wood fibre insulation is used, as this has a greater capacity for storing and evening out the moisture than mineral wool. However, the test building has so far not been exposed to internal generation of moisture (added moisture from showers, food preparation etc.). This needs to be investigated and this will be done during the winter 2013-14.

 A new fixing method for doors and windows has been tested without traditional fibre filling between them and the CLT panel. The door or window is pressed directly on to the CLT panel instead, with an expandable sealing strip between them. This has been proved to be successful.

 The air tightness between the CLT panels is achieved with expandable sealing strips between the panels. The position of the sealing strips is important, both for the air tightness itself and to allow rational assembly.

 Recurrent air tightness measurements show that the air tightness decreased somewhat during the first six months, but not to such an extent that the passive house criteria were not fulfilled. The reason for the decreased air tightness is not clear, but can be due to small movements in the CLT construction and also to the sealing strips being affected by changing outdoor temperatures.

 Long term measurements (at least two years) have to be carried out before more reliable conclusions can be drawn regarding the long term effect of the construction on air tightness and humidity in the walls.

 An economic analysis comparing using a concrete frame or the studied CLT frame for a three storey building shows that it is probably more expensive to build with CLT. For buildings higher than three floors, the CLT frame has economic advantages, mainly because of the shorter building time compared to using concrete for the frame. In this analysis, no considerations have been taken to differences in the influence on the environment or the global climate between the two construction methods.

Place, publisher, year, edition, pages
Borlänge: Högskolan Dalarna, 2013. , 43 p.
Solar Energy Research Center, Dalarna University, ISSN 1401-7555 ; 104
Keyword [en]
massivträ, passivhus
National Category
Engineering and Technology
Research subject
Energi, skog och byggd miljö, Passiva massivträhus
URN: urn:nbn:se:du-13667ISRN: DU-SERC—104—SEOAI: diva2:693611
Cerbof, 76
Available from: 2014-02-04 Created: 2014-02-04 Last updated: 2014-02-04Bibliographically approved

Open Access in DiVA

fulltext(4488 kB)1823 downloads
File information
File name FULLTEXT01.pdfFile size 4488 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Rönnelid, MatsWik, TinaJanols, Henrik
By organisation
Energy and Environmental TechnologyConstruction
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 1823 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 947 hits
ReferencesLink to record
Permanent link

Direct link