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Analys av fuktomlagring i välisolerad parallelltak: Analys med simuleringsprogrammet Wufi 2D
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2013 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Analysis of moisture rearrangements in ventilated roofs : Analysis with the simulation program Wufi 2D (English)
Abstract [sv]

Idag ökar man isoleringen alltmer i takkonstruktion för att spara energi. Ökad mängd isolering minskar temperaturen över takets yttre delar och höjer den relativa fuktigheten där.  Dessutom finns risk att fuktigt material byggs in mellan alltmer täta skikt vilket leder till att det tar längre tid för byggfukten att torka. Detta resulterar i en ogynnsam fuktfördelning med höga relativa fuktigheter över konstruktionen där risken för mikrobiell påväxt ökar. Syftet med denna studie är att utreda hur fuktomlagring sker baserad på inbyggnadsfuktkvoten i välisolerade parallelltak. För att göra riskbedömning av olika takkonstruktioner har fuktsimuleringar gjorts i Wufi 2D där resultat analyserats i Wufi Bio för bedömning av risknivå för mikrobiell påväxt. Resultaten indikerar klart skillnad mellan val av ventilerad och oventilerad takkonstruktion. Det råder även en skillnad mellan val av isoleringsmaterial, takets färdigställandedatum, takets exponeringsriktning och takets utvändiga ytskikt. Slutsatsen är att det råder en större risk för mikrobiell påväxt hos oventilerad takkonstruktion, takkonstruktion som färdigställs under höst (den 1 oktober) jämfört med vår (den 1 april), takkonstruktion som är exponerad mot norr jämfört med söder samt takkonstruktion med utvändigt ytskikt av plåt istället för sedum.

Abstract [en]

Today there's an increase in the use of insulation in roof constructions in order to save energy. Increased amount of insulation allows temperature drops in the outer layers of the roof resulting in higher relative humidity in the surrounding construction.  There is also a risk that moist materials are built-in between tight layers which contributes to longer drying processes in order for the moisture to successfully dry out.

This also contributes to an unfavorable divide in moisture with high relative humidity settling on top of the construction where risk of microbial growth is the greatest. The aim of this study is to investigate how moisture behaves based on the mounting quota of moist in well insulated parallel roof constructions.

To make a risk assessment of different roof constructions, different simulations have been created in Wufi 2D where results are further analyzed in Wufi Bio for final assessment on whether there is an apparent microbial advantage. The result help shimmer light on the differences between ventilated and unventilated roof constructions. There is also an evident importance in choice of insulation materials, the finish-date for the roof, exposure vulnerability and the outer coating of the roof.

The conclusion is that there is a greater risk of microbial damages in unventilated roof constructions when comparing the roof construction that is finished first of October in comparison to first of April, the roof construction that is exposed to north rather than south and to the roof construction with outer surface layer of tin rather than sedum.

Place, publisher, year, edition, pages
2013. , 67 p.
Keyword [en]
moisture rearrangement, built-in moisture, ventilated roofs, unventilated roofs, well insulated roofs, mineral wool, cellulose fibers, masonite beam, Wufi 2D, Wufi Bio
Keyword [sv]
fuktomlagring, inbyggnadsfuktkvot, ventilerat parallelltak, oventilerat parallelltak, välisolerat parallelltak, mineralull, cellulosafibrer, masonit balk, Wufi 2D, Wufi Bio
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-127027OAI: oai:DiVA.org:kth-127027DiVA: diva2:643423
External cooperation
AK-Konsult Indoor Air AB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-08-27 Created: 2013-08-27 Last updated: 2013-08-27Bibliographically approved

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