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Mjörnell, K. & Olsson, L. (2019). Moisture safety of wooden buildings – design, construction and operation. Journal of Sustainable Architecture and Civil Engineering, 24(1), 29-35
Open this publication in new window or tab >>Moisture safety of wooden buildings – design, construction and operation
2019 (English)In: Journal of Sustainable Architecture and Civil Engineering, ISSN 2029-9990, Vol. 24, no 1, p. 29-35Article in journal (Refereed) Published
Abstract [en]

During the last decade, building in wood has increased, mainly due to environmental awareness and targets to decrease the carbon footprint originated from the production of building materials. New technologies such as CLT (cross laminated timber) have accelerated the construction of multi-story wooden buildings. The CLT structure has been used both for housing and offices. Due to the extensive size of the buildings and relatively fast assembly of the buildings, weather protection has not always been used. It is commonly known that building materials sensitive to moisture need to be protected against high moisture conditions and water during construction. If this is not done, there is an increased risk of microbial growth which can result in health problems for future users of the building, extensive costs for the remediation and exchange of materials, but also lack of trust in the construction industry. There are disagreements between the building industry and researchers how sensitive wooden buildings are to exposure to high moisture levels and water during storage at sites and construction. Based on results from several research projects studying moisture conditions both in the laboratory and in the field, recommendations for procurement, storage and handling of wood during construction to assure moisture safety are suggested in this paper.

Place, publisher, year, edition, pages
Kauno Technologijos Universitetas, 2019
Keywords
CLT, Guidance, Massive wooden buildings, Moisture safety, Mould growth
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39928 (URN)10.5755/j01.sace.24.1.22341 (DOI)2-s2.0-85071775890 (Scopus ID)
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved
von Platten, J., Holmberg, C., Mangold, M., Johansson, T. & Mjörnell, K. (2019). The renewing of Energy Performance Certificates—Reaching comparability between decade-apart energy records. Applied Energy, 255, Article ID 113902.
Open this publication in new window or tab >>The renewing of Energy Performance Certificates—Reaching comparability between decade-apart energy records
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2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 255, article id 113902Article in journal (Refereed) Published
Abstract [en]

Energy Performance Certificates are currently one of the most extensive data sources about the energy performance of the EUs building stock and consequently provide support for researchers and policy makers in energy regulation. As Energy Performance Certificates are being renewed, there are new possibilities to study energy performance development over time and to evaluate the building-specific effect of energy policies and measures. This paper aims to explore this possibility. In Sweden, owners of multifamily buildings had to obtain their first Energy Performance Certificate no later than the end of 2008, and with a period of validity of 10 years many owners have now obtained a second Energy Performance Certificate for their building(s). This enables unprecedented quantitative, building-specific evaluations of the change in energy performance over time. However, comparability between old and new Energy Performance Certificates must be assured. This study develops a novel three-step method to attain comparability between old and renewed Energy Performance Certificates. Results show that while many pairs of Energy Performance Certificates were considered comparable, procedural changes in methods for determining heated floor area in Swedish Energy Performance Certificates caused an overestimation of energy performance improvement of approximately 7 kWh/m2 per building which had to be corrected for. The results of this paper indicate that old and renewed Energy Performance Certificates can be utilised to successfully map development of energy performance and enable evaluation of the impact on energy performance from policies and measures that have been carried out between the two points of audit. © 2019 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Building stock, Energy efficiency, Energy Performance Certificate, Evidence-based policy, Long-Term Renovation Strategy, Renovation, Buildings, Energy policy, Building stocks, Energy performance, Evidence-based
National Category
Natural Sciences Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39972 (URN)10.1016/j.apenergy.2019.113902 (DOI)
Note

Funding details: Svenska Forskningsrådet Formas, 2017-01449; Funding text 1: The authors would like to thank the Swedish authorities Boverket and Energimyndigheten for their collaborative approach to providing data and utilising the works of this paper in the update of the Swedish Long-Term Renovation Strategy. This work was supported by The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (Formas) [grant number 2017-01449 ] within the project National Building-Specific Information (NBI). The authors have no conflicts of interest to declare. Appendix A . Tables A.1–A.4 Energy performance Energy performance is the yearly, temperature corrected, and area-normalised energy used for heating, domestic hot water, and building electricity for lighting and ventilation. Domestic electricity use is not included.

Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved
Mangold, M., Mjörnell, K., Durgun, Ö. & Johansson, T. (2018). Fastighetsägares förutsättningar för renovering av sina byggnadsbestånd från miljonprogramstiden. Bygg&Teknik, 2
Open this publication in new window or tab >>Fastighetsägares förutsättningar för renovering av sina byggnadsbestånd från miljonprogramstiden
2018 (Swedish)In: Bygg&Teknik, ISSN 0281-658X, Vol. 2Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [sv]

Byggsektorn står inför ett stort renoveringsbehov. Byggnader från miljonprogramstiden har nått en ålder då många olika byggnadsdelar når sin förväntade livslängd. Detta renoveringsbehov är inte jämnt fördelat bland Sveriges fastighetsägare. Det stora flertalet av de ännu ej renoverade byggnaderna från miljonprogramstiden ägs av fastighetsbolag knutna till SABO, men det finns även många privata fastighetsägare och bostadsrättsföreningar som har ett eftersläpande renoveringsbehov eller som har renoverat men fortfarande har en hög energianvändning och alltså troligtvis inte genomfört nödvändiga energieffektiviseringsåtgärder. Det finns också olika förutsättningar för att göra de investeringar som krävs, vilket beror på företagens soliditet, fastigheternas värde och möjligheten att få lån, utrymme för hyresökning etc. Detta gör att renoveringstakten inte kommer att täcka renoveringsbehovet och att vissa delar av fastighetsbeståndet kommer att vara mer eftersatt.

Keywords
Fastighetsägare, renovering, energianvändning, hyresökning, social hållbarhet
National Category
Environmental Analysis and Construction Information Technology
Identifiers
urn:nbn:se:ri:diva-36095 (URN)
Projects
Nationell Byggnadsspecifik Information
Funder
Swedish Research Council Formas
Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2019-06-27Bibliographically approved
Höjer, M. & Mjörnell, K. (2018). Measures and Steps for More Efficient Use of Buildings. Sustainability, 10(6), Article ID 1949.
Open this publication in new window or tab >>Measures and Steps for More Efficient Use of Buildings
2018 (English)In: Sustainability, ISSN 20711050, Vol. 10, no 6, article id 1949Article in journal (Refereed) Published
Abstract [en]

As urbanization continues and more people move into cities and urban areas, pressure on availablelandfornewconstructionswillcontinuetoincrease. Thissituationconstitutesanincentiveto reviewtheneedforinteriorspaceandusesofexistingbuildings. Agreatdealcanbegainedfromusing existingbuildingsmoreefficientlyinsteadofconstructingnewones: Reducedresourceusageduring construction(investments,naturalresources,andenergy),operation,andmaintenance;moreactivityper squaremeterofbuildingscreatesagreaterbasisforpublictransportandotherservices;moreintensive useofbuildingscreatesamorevibrantcitywithoutbuildingonvirginland. Theaimofthispaperisto initiateadiscussionregardinghowdigitalizationcanaffectthedemandandsupplyofinteriorspace in existing buildings and elaborate on how policy can support more resource-efficient uses of space. New activity-based resource measurements intended for use in buildings are proposed, and several principles that have the potential to decrease environmental impact through more efficient usage of space are outlined. Based on these ideas for encouraging the flexible use of building spaces that are facilitatedbydigitalizationandthenewmeasurementapproaches,afour-stepprincipleforconstruction isproposed: Thefirststepistoreducethedemandforspace,thesecondistointensifyusageofexisting space, the third is to reconstruct and adapt existing buildings to current needs, and the fourth is to constructnewbuildings. Urgingpolitical,municipal,construction,andreal-estatedecisionmakersto contemplatethisprinciple,particularlyinviewofthenewconditionsthatdigitalizationentails,willlead tomoresustainableconstructionand,inthelongterm,asustainablebuiltenvironment.

Keywords
resource use; energy use; interior space utilization; buildings; sharing; digitalizatio
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33929 (URN)10.3390/su10061949 (DOI)2-s2.0-85048257456 (Scopus ID)
Available from: 2018-06-11 Created: 2018-06-11 Last updated: 2019-01-09
Femenías, P., Mjörnell, K. & Thuvander, L. (2018). Rethinking deep renovation: The perspective of rental housing in Sweden. Journal of Cleaner Production, 195, 1457-1467
Open this publication in new window or tab >>Rethinking deep renovation: The perspective of rental housing in Sweden
2018 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 195, p. 1457-1467Article in journal (Refereed) Published
Abstract [en]

This study examines renovation strategies among owners of rental housing in Sweden in response to European energy policies that promote deep renovation as a means to reduce carbon emissions from residential buildings. Case studies of eleven housing companies, seven public and three private, were designed with the aim to examine housing owners’ attitudes and renovation strategies, and how policies and objectives for energy efficiency become incorporated into these attitudes and strategies. Results are illustrated in typologies that distinguish between renovation strategies with either a more commercial or a more societal focus and spanning between deep and partial renovation. The typologies can be used to discuss how different aspects influence renovation, and illustrates how strategies change over time. The study identifies a trend in which housing owners are increasingly relying on partial or over-time renovation. Cost is one important driver, but social responsibility toward tenants and in some cases the protection of cultural heritage are also found to be important. A distrust of fixed models for renovation was observed. The paper questions the concept of deep renovation and suggests instead partial and over-time renovation as a way forward toward sustainable renovation. Partial renovation can bring together energy efficiency with environmental, financial, social, and cultural objectives of housing management. If managed properly, over-time renovation can reduce the risk of an investment, and has the advantage of allowing future technological advancements in energy efficiency to be included in current planning.

Keywords
Sustainable renovation; Renovation process; Strategies; Energy efficiency; Housing owners; Multi-residential housing; Typologies
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-33227 (URN)10.1016/j.jclepro.2017.12.282 (DOI)2-s2.0-85040353123 (Scopus ID)
Funder
Swedish Research Council Formas
Available from: 2018-02-09 Created: 2018-02-09 Last updated: 2018-12-20Bibliographically approved
Ranhagen, U., Bogren, M., Mjörnell, K., Sandberg, J., Persson, A., Schylberg, K., . . . Lindh, H. (2017). Attraktiva livsmiljöer och flöden: åtta teman för planering av framtidens goda stad. Stockholm: Kungliga Vetenskapsakademien IVA
Open this publication in new window or tab >>Attraktiva livsmiljöer och flöden: åtta teman för planering av framtidens goda stad
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2017 (Swedish)Report (Other (popular science, discussion, etc.))
Place, publisher, year, edition, pages
Stockholm: Kungliga Vetenskapsakademien IVA, 2017. p. 72
Series
IVA-M, ISSN 1102-8254 ; IVA-M486
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-32883 (URN)978-91-7082-960-4 (ISBN)
Note

IVA-projektet Framtidens goda stad

Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2019-02-04Bibliographically approved
Mjörnell, K. (2017). En stark forskningsmiljö om hållbar integrerad renovering, SIRen. Husbyggaren (5), 20-21
Open this publication in new window or tab >>En stark forskningsmiljö om hållbar integrerad renovering, SIRen
2017 (Swedish)In: Husbyggaren, no 5, p. 2p. 20-21Article in journal (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Svenska Byggingenjörernas Riksförbund, 2017. p. 2
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-32874 (URN)
Available from: 2017-12-15 Created: 2017-12-15 Last updated: 2018-08-22Bibliographically approved
Johansson, P., Mjörnell, K. & Arfvidsson, J. (2017). Examples of characteristics of wood that affect mould growth: a meta-analysis. European Journal of Wood and Wood Products, 75(4), 603-613
Open this publication in new window or tab >>Examples of characteristics of wood that affect mould growth: a meta-analysis
2017 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 75, no 4, p. 603-613Article in journal (Refereed) Published
Abstract [en]

Building materials differ in their susceptibility to mould growth. Wood is a material often considered to have a low mould resistance. However, wood is not a homogenous material and different characteristics of the material are expected to have an impact on mould growth. In this paper, it was shown that wood species (pine or spruce), sawing pattern (centre-board or side-board) and surface structure (planed or sawn) affected mould growth. In addition, it was indicated that the susceptibility cannot be described by one single parameter, but also depends on other parameters. It is therefore difficult to estimate the susceptibility of wood in general. These conclusions were drawn from a meta-analysis, using data from five separate, previously performed laboratory studies conducted at 90% relative humidity and 22 °C, and from a laboratory study performed at 95% RH and 22 °C. © 2016 Springer-Verlag Berlin Heidelberg

Keywords
Molds, Laboratory studies, Meta analysis, Mould growth, Mould resistances, Sawing patterns, Single parameter, Wood
National Category
Microbiology
Identifiers
urn:nbn:se:ri:diva-27587 (URN)10.1007/s00107-016-1127-x (DOI)2-s2.0-84995395731 (Scopus ID)
Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2018-08-22Bibliographically approved
Höjer, M., Mjörnell, K., Andersson, O., Kallstenius, Å., Lennebo, R., Minoz, Å. & Renander, L. (2017). Här är fyra smarta alternativ till att bygga nytt. Dagens samhälle, Article ID 29 maj.
Open this publication in new window or tab >>Här är fyra smarta alternativ till att bygga nytt
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2017 (Swedish)In: Dagens samhälle, article id 29 majArticle in journal, News item (Other (popular science, discussion, etc.)) Published
Abstract [sv]

Vi behöver 710 000 nya bostäder inom en tioårsperiod, men även behovet av andra fastigheter ökar när befolkningen växer. Det är hög tid att lyfta alternativ till att bygga nytt. Här presenteras en fyrstegsprincip för mer effektivt användande av ytor, skriver forskare, fastighetsägare och arkitekter med flera tillsammans.

https://www.dagenssamhalle.se/debatt/har-ar-fyra-smarta-alternativ-till-att-bygga-nytt-17320

Place, publisher, year, edition, pages
Stockholm: Dagens Samhälle AB, 2017
National Category
Engineering and Technology Social Sciences
Identifiers
urn:nbn:se:ri:diva-32884 (URN)
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2019-02-04Bibliographically approved
Mangold, M., Mjörnell, K. & Johansson, T. (2017). Nya digitala verktyg ger bättre bild av renoveringsbehovet. Bygg & Teknik (5)
Open this publication in new window or tab >>Nya digitala verktyg ger bättre bild av renoveringsbehovet
2017 (Swedish)In: Bygg & Teknik, no 5, p. 4Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [sv]

Byggsektorn är inne i en period av mycket hög aktivitet. Över 700 000 nya bostäder efterfrågas, samtidigt som miljonprogrammets byggnader börjar nå sin förväntade livslängd. Detta är en enorm utmaning, men det är också en möjlighet, där vi kan nå energi- och klimatmål och skapagoda boendemiljöer till rimlig kostnad.

Place, publisher, year, edition, pages
Stockholm: Byggteknikförlaget, 2017. p. 4
National Category
Engineering and Technology
Identifiers
urn:nbn:se:ri:diva-32882 (URN)
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2019-06-27Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3863-0740

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