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  • 1.
    Adeboye, Peter Temitope
    et al.
    Chalmers University of Technology, Sweden.
    Bettiga, Maurizio
    Chalmers University of Technology, Sweden.
    Aldaeus, Fredrik
    RISE, Innventia.
    Larsson, Per Tomas
    RISE, Innventia.
    Olsson, Lars
    RISE, Innventia. Chalmers University of Technology, Sweden.
    Catabolism of coniferyl aldehyde, ferulic acid and p-coumaric acid by Saccharomyces cerevisiae yields less toxic products2015In: Microbial Cell Factories, ISSN 1475-2859, E-ISSN 1475-2859, Vol. 14, no 1, article id 149Article in journal (Refereed)
    Abstract [en]

    Background: Lignocellulosic substrates and pulping process streams are of increasing relevance to biorefineries for second generation biofuels and biochemical production. They are known to be rich in sugars and inhibitors such as phenolic compounds, organic acids and furaldehydes. Phenolic compounds are a group of aromatic compounds known to be inhibitory to fermentative organisms. It is known that inhibition of Sacchromyces cerevisiae varies among phenolic compounds and the yeast is capable of in situ catabolic conversion and metabolism of some phenolic compounds. In an approach to engineer a S. cerevisiae strain with higher tolerance to phenolic inhibitors, we selectively investigated the metabolic conversion and physiological effects of coniferyl aldehyde, ferulic acid, and p-coumaric acid in Saccharomyces cerevisiae. Aerobic batch cultivations were separately performed with each of the three phenolic compounds. Conversion of each of the phenolic compounds was observed on time-based qualitative analysis of the culture broth to monitor various intermediate and final metabolites. Result: Coniferyl aldehyde was rapidly converted within the first 24 h, while ferulic acid and p-coumaric acid were more slowly converted over a period of 72 h. The conversion of the three phenolic compounds was observed to involved several transient intermediates that were concurrently formed and converted to other phenolic products. Although there were several conversion products formed from coniferyl aldehyde, ferulic acid and p-coumaric acid, the conversion products profile from the three compounds were similar. On the physiology of Saccharomyces cerevisiae, the maximum specific growth rates of the yeast was not affected in the presence of coniferyl aldehyde or ferulic acid, but it was significantly reduced in the presence of p-coumaric acid. The biomass yields on glucose were reduced to 73 and 54 % of the control in the presence of coniferyl aldehyde and ferulic acid, respectively, biomass yield increased to 127 % of the control in the presence of p-coumaric acid. Coniferyl aldehyde, ferulic acid and p-coumaric acid and their conversion products were screened for inhibition, the conversion products were less inhibitory than coniferyl aldehyde, ferulic acid and p-coumaric acid, indicating that the conversion of the three compounds by Saccharomyces cerevisiae was also a detoxification process. Conclusion: We conclude that the conversion of coniferyl aldehyde, ferulic acid and p-coumaric acid into less inhibitory compounds is a form of stress response and a detoxification process. We hypothesize that all phenolic compounds are converted by Saccharomyces cerevisiae using the same metabolic process. We suggest that the enhancement of the ability of S. cerevisiae to convert toxic phenolic compounds into less inhibitory compounds is a potent route to developing a S. cerevisiae with superior tolerance to phenolic compounds.

  • 2.
    Baison, John
    et al.
    SLU Swedish University of Agricultural Science, Sweden.
    Vidalis, Amaryllis
    Technische Universität München, Germany.
    Zhou, Linghua
    SLU Swedish University of Agricultural Science, Sweden.
    Chen, Zhi-Qiang
    SLU Swedish University of Agricultural Science, Sweden.
    Li, Zitong
    University of Helsinki, Finland.
    Sillanpää, Mikko J
    University of Oulu, Finland.
    Bernhardsson, Carolina
    SLU Swedish University of Agricultural Science, Sweden.
    Scofield, Douglas
    Uppsala University, Sweden.
    Forsberg, Nils
    SLU Swedish University of Agricultural Science, Sweden.
    Grahn, Thomas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Karlsson, Bo
    Skogforsk, Sweden.
    Wu, Harry
    SLU Swedish University of Agricultural Science, Sweden.
    Ingvarsson, Pär K
    Umeå University, Sweden.
    Lundqvist, Sven-Olof
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging. IIC, Sweden.
    Niittylä, Totte
    SLU Swedish University of Agricultural Science, Sweden.
    García-Gil, M Rosario
    SLU Swedish University of Agricultural Science, Sweden.
    Genome-Wide Association Study (GWAS) identified novel candidate loci affecting wood formation in Norway spruce2019In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313XArticle in journal (Refereed)
    Abstract [en]

    Norway spruce is a boreal forest tree species of significant ecological and economic importance. Hence there is a strong imperative to dissect the genetics underlying important wood quality traits in the species. We performed a functional Genome-Wide Association Study (GWAS) of 17 wood traits in Norway spruce using 178101 single-nucleotide polymorphisms (SNPs) generated from exome genotyping of 517 mother trees. The wood traits were defined using functional modelling of wood properties across annual growth rings.We applied a LASSO based association mapping method using a functional multi-locus mapping approach that utilizes latent traits, with a stability selection probability method as the hypothesis testing approach to determine significant Quantitative Trait Loci (QTLs). The analysis provided 52 significant SNPs from 39 candidate genes, including genes previously implicated in wood formation and tree growth in spruce and other species. Our study represents a multi-locus GWAS for complex wood traits in Norway spruce. The results advance our understanding of the genetics influencing wood traits and identifies candidate genes for future functional studies.

  • 3.
    Chen, Zhi-Qiang
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Karlsson, Bo
    Skogforsk, Sweden.
    Lundqvist, Sven-Olof
    RISE, Innventia.
    Garci­a Gil, María Rosario
    SLU Swedish University of Agricultural Sciences, Sweden.
    Olsson, Lars
    RISE, Innventia.
    Wu, Harry X.
    CSIRO Commonwealth Scientific and Industrial Research Organisation, Australia.
    Estimating solid wood properties using Pilodyn and acoustic velocity on standing trees of Norway spruce2015In: Annals of Forest Science, ISSN 1286-4560, E-ISSN 1297-966X, Vol. 72, no 4, p. 499-508Article in journal (Refereed)
    Abstract [en]

    Key message: Strong genetic correlations were observed between Pilodyn measurement and wood density, and between acoustic velocity and MFA. Combination of Pilodyn penetration and acoustic velocity measurements from standing trees can provide reliable prediction of stiffness of Norway spruce for breeding selection.

    Context: Traditional methods for the estimation of solid wood quality traits of standing tree such as wood density, microfibril angle (MFA), and modulus of elasticity (MOE) are time-consuming and expensive, which render them unsuitable for rapidly screening a large number of trees in tree breeding programs.

    Aim: This study aims to evaluate the suitability of using Pilodyn penetration and acoustic velocity (nondestructive evaluation) to assess wood density, MFA, and MOE for Norway spruce.

    Methods: Pilodyn penetration and Hitman acoustic velocity, as well as wood density, MFA, and MOE using benchmark SilviScan were measured on 5618 standing trees of 524 open-pollinated families in two 21-year-old Norway spruce (Picea abies) progeny trials in southern Sweden.

    Results: Strong genetic correlations were observed between Pilodyn measurement and wood density (rg = −0.96), and between acoustic velocity and MFA (rg = −0.94). Combination of Pilodyn penetration and Hitman acoustic velocity measurements (Formula presented.) obtained from standing trees showed a genetic correlation with benchmark MOE of 0.99. This combined MOE(Formula presented.) had higher selection efficiency for benchmark MOE (92 %) compared to 58–60 % using acoustic velocity alone and 78 % using Pilodyn penetration alone.

    Conclusion: Combination of Pilodyn penetration with Hitman acoustic velocity provided very high selection efficiency for the three most important quality traits for wood mechanical properties in Norway spruce.

  • 4.
    Chen, Zhi-Qiang
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Karlsson, Bo
    Skogforsk, Sweden.
    Mörling, Tommy
    SLU Swedish University of Agricultural Sciences, Sweden.
    Olsson, Lars
    RISE, Innventia.
    Mellerowicz, Ewa J.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Wu, Harry X.
    SLU Swedish University of Agricultural Sciences, Sweden; CSIRO Commonwealth Scientific and Industrial Research Organisation, Australia.
    Lundqvist, Sven-Olof
    RISE, Innventia.
    Gil, María Rosario García
    SLU Swedish University of Agricultural Sciences, Sweden.
    Genetic analysis of fiber dimensions and their correlation with stem diameter and solid-wood properties in Norway spruce2016In: Tree Genetics & Genomes, ISSN 1614-2942, E-ISSN 1614-2950, Vol. 12, no 6, article id 123Article in journal (Refereed)
    Abstract [en]

    Adverse genetic correlations between growth traits and solid-wood, as well as fiber traits are a concern in conifer breeding programs. To evaluate the impact of selection for growth and solid-wood properties on fiber dimensions, we investigated the inheritance and efficiency of early selection for different wood-fiber traits and their correlations with stem diameter, wood density, modulus of elasticity (MOE), and microfibril angle (MFA) in Norway spruce (Picea abies L). The study was based on two large open-pollinated progeny trials established in southern Sweden in 1990 with material from 524 families comprising 5618 trees. Two increment cores were sampled from each tree. Radial variations from pith to bark were determined for rings 3–15 with SilviScan for fiber widths in the radial (RFW) and tangential (TFW) direction, fiber wall thickness (FWT), and fiber coarseness (FC). Fiber length (FL) was determined for rings 8–11. Heritabilities based on rings 8–11 using joint-site data were moderate to high (0.24–0.51) for all fiber-dimension traits. Heritabilities based on stem cross-sectional averages varied from 0.34 to 0.48 and reached a plateau at rings 6–9. The “age-age” genetic correlations for RFW, TFW, FWT, and FC cross-sectional averages at a particular age with cross-sectional averages at ring 15 reached 0.9 at rings 4–7. Our results indicated a moderate to high positive genetic correlation for density and MOE with FC and FWT, moderate and negative with RFW, and low with TFW and FL. Comparison of several selection scenarios indicated that the highest profitability is reached when diameter and MOE are considered jointly, in which case, the effect on any fiber dimension is negligible. Early selection was highly efficient from ring 5 for RFW and from rings 8–10 for TFW, FWT, and FC.

  • 5.
    Johansson, Carl-Johan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Jermer, Jöran
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Lycken, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Rekommendation avseende fukt i virke för inbyggnad2013Report (Refereed)
  • 6.
    Mjörnell, Kristina
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratory investigation of sills and studs exposed to rain2012In: Proceedings of the 5th International Building Physics Conference, 2012, , p. 7Conference paper (Refereed)
  • 7.
    Mjörnell, Kristina
    et al.
    RISE - Research Institutes of Sweden, Built Environment. Lund University, Sweden.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Moisture safety of wooden buildings – design, construction and operation2019In: Journal of Sustainable Architecture and Civil Engineering, ISSN 2029-9990, Vol. 24, no 1, p. 29-35Article in journal (Refereed)
    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.

  • 8.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Diffusionsöppna underlagstak för fuktsäkra tak2007In: Bygg & Teknik, Vol. 4, no 7, p. 34-35Article in journal (Other (popular science, discussion, etc.))
  • 9.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Fuktförhållanden i välisolerade takkonstruktioner: fältmätningar2015In: Bygg & teknik, ISSN 0281-658X, no 4, p. 12-16Article in journal (Refereed)
    Abstract [sv]

    Fyra takkonstruktioner har undersökts med avseende på fukt och risk för mögelpåväxt. Studien visar varken på mögelpåväxt eller direkt risk för mögelpåväxt i de studerade takkonstruktionerna. Flera faktorer kan ha haft positiv betydelse såsom värmepåverkan från solen, smart vindsventilation med värmekälla, viss påverkan från passiv värmekälla från installationer och värmebryggor, lagom ventilation men även gynnsamt uteklimat. Dessutom har husen allmänventilation med till- och frånluft eller frånluft, vilket minskar risken att fuktig inomhusluft läcker ut i taken.

  • 10.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Fuktmätningar i fyra trähus2013Report (Refereed)
    Abstract [sv]

    Syftet är att öka kunskapen om rådande fukt- och temperaturtillstånd och dess varaktighet i välisolerade träbyggnaders klimatskärm och dess betydelse för mikrobiell påväxt.

  • 11.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Fuktmätningar under två år efter byte av putsfasad2011Report (Refereed)
    Abstract [sv]

    Fuktskador har upptäckts i hus med putsade, enstegstätade regelväggar vilket har behandlats i ett branschgemensamt forskningsprojekt om ”Fuktsäkerheten i putsade, enstegstätade regelväggar”. Inom forskningsprojektet framkom att det är viktigt att följa upp fuktförhållanden i konstruktioner som byggs eller byggs om, detta för att kontrollera att resultatet blir det önskade. Representanter från entreprenörer och materialtillverkare tillfrågades att upplåta byggnader, som ska renoveras eller nyproduceras, för uppföljning av fukttillstånd i yttervägg bakom putsfasad. Det som kunde erbjudas då var två områden i Helsingborg där fasaderna behövde byggas om. I denna fältstudie har fukt- och temperaturmätning skett kontinuerligt under en tvåårsperiod, i hus som byggts om men fortfarande har den ”enstegstätade” lösningen men med förbättrade detaljlösningar, och i ett hus som byggts om med en ”tvåstegstätad”, ventilerad lösning.

  • 12.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Fuktsäkra tak ska fuktsäkras2009In: Bygg & Teknik, Vol. 4, no 9, p. 33-34Article in journal (Other (popular science, discussion, etc.))
  • 13.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Ingen tar funktionsansvaret för byggnadskonstruktioner2014In: Fastighet & Bostadsrätt, no 4, p. 1-Article in journal (Other (popular science, discussion, etc.))
  • 14.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratoriestudie av inläckagemängder i sju olika otätheter i fasad exponerad för slagregn och vattenstänk2015Report (Refereed)
    Abstract [sv]

    Syftet med denna studie var att undersöka vilken betydelse vattenstänk, olika vindtryck, olika regnbelastningar samt kombinationer av dessa har på inläckageflödet i olika otätheter i fasad. Resultaten visar exempelvis att andel inläckageflöde för flera otätheter ligger kring 2 procent av påförd regnbelastning på 1,22 l/min-m. Regnbelastningen bedöms kunna motsvara kraftigt slagregn som rinner längs fasaden på slagregnsutsatta flervåningsbyggnader. Mätningar visar överlag att betydande vattenmängder, 0,03 l/min per otäthet kan läcka in kontinuerligt, vid kraftig regnbelastning, genom fasad även i relativt små osynliga otätheter som bedöms som vanligt förekommande. Detta även om fasaden är tryckutjämnad såsom i exempelvis välventilerade fasader.

  • 15.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratoriestudie av syllar och reglar som utsatts för regn2011Report (Refereed)
    Abstract [sv]

    Our experience from site visits is that timber sills are not protected if it rains while the house is under construction. However, opinions in the building industry are divided as to whether this presents a problem in terms of risk of mould growth. This study was carried out in order to investigate whether wooden sills and studs can withstand being briefly exposed to water before they are built in by the rest of the structure, or while they are built in, and whether there is any risk of mould growth.

  • 16.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratoriestudie av träfasaders täthet mot slagregn2012Report (Refereed)
    Abstract [sv]

    Laboratory investigation of the resistance of wooden façade to driving rain The objective of this study has been to obtain better knowledge of the protection against driving rain provided by present-day wooden façades, whether prefabricated or constructed in situ, by investigating how well the exterior of the façade, penetrations and connections withstand rain.

  • 17.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratoriestudie av träregelväggar med olika vindskydd2011Report (Refereed)
  • 18.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Laboratory investigation of timber frame walls with various weather barriers2012Report (Refereed)
  • 19.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut. Chalmers University of Technology, Sweden.
    Laboratory study of driving rain resistance of four façade systems with window fittings - Experimental results of leakage flows2016In: CESB 2016 - Central Europe Towards Sustainable Building 2016: Innovations for Sustainable Future, 2016, p. 1233-1240Conference paper (Refereed)
    Abstract [en]

    Facades generally experience leaks and driving rain is considered to be a significant source of moisture, which should be taken into account when carrying out moisture calculations for exterior walls. Water can leak into the exterior walls and facades to a greater or lesser extent. However, we lack specific information with details on the amount of penetrating water. Four facade systems have been examined. Three of the facade systems were different in that there was one ventilated system, one single-stage sealing system and two drained systems. To better understand the exact importance of seals and variations in installation and workmanship, these factors have also been studied. The measurements show significant water leakage where seals are absent. Even in cases with seals present, there are leakages. Although the installations were performed by professionals, it was still leaky which shows that facade systems with window fittings should be designed and tested for any anticipated defects in order to ensure that the exterior wall are not subject to moisture damage.

  • 20.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Lösningar för krypgrundsproblematiken2006In: Bygg & Teknik, Vol. 8, no 6, p. 12&13-Article in journal (Other (popular science, discussion, etc.))
  • 21.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Omfördelning av fukt och risk för mikrobiell påväxt på virkesstycken i virkespaket2012Report (Refereed)
    Abstract [sv]

    Syftet med denna studie är att öka kunskapen dels om tiden för fuktomfördelning i virkesstycken i virkespaket, dels om betydelsen av fuktinnehåll i kombination med lagringstemperatur och lagringstid med avseende på mikrobiell påväxt.

  • 22.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    P-märkning av byggsystem för takkonstruktioner och taktäckning2012In: Bygg&Teknik, no 4, p. 26-28Article in journal (Other (popular science, discussion, etc.))
  • 23.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    P-märkning av byggsystem för ytterväggar och fasader2009In: Bygg & Teknik, Vol. 8, no 9, p. 33-34Article in journal (Other (popular science, discussion, etc.))
  • 24.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Built Environment, Building Technology. Chalmers University of Technology, Sweden.
    Rain intrusion rates at façade details - A summary of results from four laboratory studies2017In: Energy Procedia, 2017, p. 387-392Conference paper (Refereed)
    Abstract [en]

    More knowledge and realistic data on inward leakage is needed not only to better understand and confirm rain resistance of different facades, but also to carry out reliable theoretical moisture risk assessments of façade details in external walls. This article is an attempt to highlight amounts of expected leakage based on four laboratory studies. The results show that under heavy driving rain conditions, there may be continuous point leakage of significant volumes of water (0,01-0,05 l/min) in small invisible deficiencies, and corresponds to up to 2% of the applied water load. The leakage rate also depends, more or less, on the size, position and geometry of the deficiency, cumulative runoff rates, size of projecting details and surface properties. © 2017 The Authors.

  • 25.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Built Environment, Building Technology. Chalmers University of Technology, Sweden.
    Rain resistance of façades with façade details: A summary of three field and laboratory studies2018In: Journal of Building Physics, ISSN 1744-2591, E-ISSN 1744-2583, Vol. 41, no 6, p. 521-532Article in journal (Refereed)
    Abstract [en]

    ne of the main functions of the exterior walls and façades is to protect the indoor and the sensitive parts of construction from the outdoor climate. Exposure of driving rain is the most prominent moisture source a wall has to resist. Despite this, there is a lack of information on rain resistance. Field measurements on real-life external walls show that recurrent water leakage under driving rain conditions is observed in five out of seven new-built houses in Sweden, including those with ventilated façades. About a 100 commercial laboratory façade tests, mounted by façade suppliers, and targeted laboratory experiments showed that it is almost impossible to achieve fully tight façade solutions, and keep them sealed. Nearly, all test walls with façade details leaked, almost regardless of façade type and sealing efforts. The results from field and laboratory measurements of rain resistance in new buildings in Sweden show that façades are usually not water-tight and also that very small deficiencies can cause substantial amount of water leakage. © 2017, © The Author(s) 2017.

  • 26.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Results from laboratory of wind driven rain tightness in different types of facades2014Conference paper (Refereed)
  • 27.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Slagregnstäthet hos fasader och vindskydd2014In: Bygg & Teknik, no 2, p. 32-36Article in journal (Other (popular science, discussion, etc.))
  • 28.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Studie av kondensrisk i ett mekaniskt ventilerat golv2008Report (Refereed)
  • 29.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Torrt träbyggande krävs2011In: Bygg & Teknik, Vol. 5, no 11, p. 16-17Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Det är vanligt att träkonstruktioner blir blöta under byggskedet i samband med regn och risken för mögelpåväxt är stor. Bättre konstruktionslösningar, regnsäkraa montagemetoder eller heltäckande väderskydd behövs. Luftfuktigheten ute är generellt sett inget problem vid prefabricerat trähusbyggande.

  • 30.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Typgodkänd krypgrund håller fukten borta2011In: Husbyggaren, no 3, p. 24-27Article in journal (Other (popular science, discussion, etc.))
  • 31.
    Olsson, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Är det risk för mögelpåväxt i välisolerade träregelväggar?2014In: Bygg & Teknik, no 5, p. 44-47Article in journal (Other (popular science, discussion, etc.))
  • 32.
    Olsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Ehnlund, Anders
    Torra tak - Undersökning av oventilerat parallelltak med underlagstaksprodukten Tyvek Pro samt undersökning av cellulosaisoleringens fuktegenskaper2000Report (Refereed)
  • 33.
    Olsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Gustavsson, Thorbjörn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Certifiering inom energieffektivt byggande2009In: Bygg & Teknik, Vol. 2, no 9, p. 73-74Article in journal (Other (popular science, discussion, etc.))
  • 34.
    Olsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Johansson, Pernilla
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Mjörnell, Kristina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Moisture and mould in prefabricated timber fram constructions during production until enclosure of the house2011Conference paper (Other academic)
  • 35.
    Olsson, Lars
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Mjörnell, Kristina
    RISE - Research Institutes of Sweden.
    Väderskyddat byggande: - eller omfattande fukt- och mögelkontroll av fuktexponerat virke, konstruktioner och KL-trä?2017In: Bygg & Teknik, no 5, p. 4Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    När det gäller byggnadskonstruktioner så behöver allt fuktkänsligt byggmaterial skyddas mot förhöjd fuktighet och vatten. Görs inte detta så är risken stor bland annat för mikrobiell påväxt och byggnadsdelar behöver undersökas med avseende på fukt och mikrobiell påväxt.Anledningen till att det behöver undersökas med avseende på mikrobiell påväxt handlar inte bara om risken för hälsobesvär hos framtida brukare av byggnaden eller sanerings- och undersökningskostnader och utbyte av material och konstruktioner som följd av uppfuktning, utan även etik- och miljökonsekvensfrågor som blivit alltmer betydelsefullt i byggprojekt

  • 36.
    Olsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Mjörnell, Kristina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Johansson, Pernilla
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Kartläggning av fuktförhållanden vid prefabricerat trähusbyggande2010Report (Refereed)
  • 37.
    Olsson, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Samuelson, Ingemar
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi.
    Mjörnell, Kristina
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggnadsfysik och innemiljö (ETi ).
    Det är inte bara fukten utan även marken som är problemet med krypgrunden.2015In: Bygg & teknik, no 7, p. 63-Article in journal (Other academic)
  • 38.
    Zhou, Linghua
    et al.
    SLU Swedish University of Agricultural Science, Sweden.
    Chen, Zhiqiang
    SLU Swedish University of Agricultural Science, Sweden.
    Lundqvist, Sven Olof
    RISE - Research Institutes of Sweden, Bioeconomy. IIC, Sweden.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy.
    Grahn, Thomas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Karlsson, Bo
    Skogforsk, Sweden.
    Wu, Harry
    SLU Swedish University of Agricultural Science, Sweden; CSIRO, Australia.
    García-Gil, Maria
    SLU Swedish University of Agricultural Science, Sweden.
    Genetic analysis of wood quality traits in norway spruce open-pollinated progenies and their parent plus trees at clonal archives and the evaluation of phenotypic selection of plus trees2019In: Canadian Journal of Forest Research, ISSN 0045-5067, E-ISSN 1208-6037, Vol. 49, no 7, p. 810-818Article in journal (Refereed)
    Abstract [en]

    A two-generation pedigree involving 519 Norway spruce (Picea abies (L.) Karst.) plus trees (at clonal archives) and their open-pollinated (OP) progenies was studied with the aim to evaluate the potential of plus-tree selection based on phenotype data scored on the plus trees. Two wood properties (wood density and modulus of elasticity, MOE) and one fiber property (microfibril angle, MFA) were measured with a SilviScan instrument on samples from one ramet per plus tree and 12 OP progenies per plus tree (total of 6288 trees). Three ramets per plus tree and their OP progenies were also assessed for Pilodyn penetration depth and Hitman acoustic velocity, which were used to estimate MOE. The narrow-sense heritability (h2) estimates based on parent– offspring regression were marginally higher than those based on half-sib correlation when three ramets per plus tree were included. For SilviScan data, estimates of the correlation between half-sib, progeny-based breeding values (BVs) and plus-tree phenotypes, as well as repeatability estimates, were highest for wood density, followed by MOE and MFA. Considering that the repeatability estimates from the clonal archive trees were higher than any h2 estimate, selection of the best clones from clonal archives would be an effective alternative.

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