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Fuktstudie om uteluftsventilerade vindar med beräkningsprogrammet Simple Cold Attic Model från Annex 55
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.
2014 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Moisture related Study in outdoor air ventilated attics with the calculation program Simple Cold Attic Model from Annex 55 (English)
Abstract [sv]

Fuktskador på uteluftsventilerade vindar är ett ökat problem, i det mer miljömedvetna Sverige. Genom tjockare vindsbjälklagsisolering minskar både energiförlusten genom bjälklaget och uppvärmningsbehovet i huset, men hur många funderar på vad som händer med det förändrade klimatet på vinden och hur det kan påverka fuktförhållandena i utsatta delar av konstruktionen.

Studier från Chalmers Tekniska Högskola har framställt ett fuktberäkningsprogram för uteluftsventilerade vindar vid namn Simple Cold Attic Model. Programmets funktion och potential har prövats i denna rapport genom en beräkningsanalys av en uteluftsventilerad vindskonstruktion. Försök till att förbättra fuktsäkerheten i konstruktionen har utförts och redovisas i rapporten. 

Studien har påvisat att den studerade konstruktionen inte är fuktsäker om den uppförs i Stockholmsområdet. Det visades även att aktiva val i konstruktionen kan förebygga fuktskador. 

Studien har påvisat vikten av inte beräkna med medelår för klimat och hur det påverkar beräkningsresultatet av mögeltillväxt. Detta har understrukit vikten av att ha ett beräkningsprogram som Simple Cold Attic Model som kraftigt reducerar beräkningsmängden vid fuktriskbedömning. 

Rekommendationen till företaget AK Konsult är att tillämpa beräkningsprogrammet när det har utvecklats till fullo.

Abstract [en]

Moisture Damage in outdoor air ventilated attics is a growing problem in the more environmentally conscious Sweden. Thick ceiling insulation reduces both energy loss through the soffit and the need for heating in the house, but how many people are thinking about what happens to the changing climate on the wind and how it can affect moisture conditions in deprived parts of the structure.Studies from Chalmers University of Technology have resulted in a moisture calculation program for outdoor air ventilated attics named Simple Cold Attic Model. The program's performance and potential have been examined in this report, through a calculation analysis of an outdoor air ventilated attic construction. Attempts to improve the moisture safety in the construction have been carried out and are presented in this report.The study has demonstrated that the studied structure is not moisture-proof if it is built in the Stockholm area. It also shows that an active choice in the design can prevent moisture damage.

The study has shown the importance of not calculating with an average year for climate and how it affects the calculation result of mold growth. This emphasizes the importance of having a calculation tool as Simple Cold Attic Model, that significantly reduces the amount of calculations in the assessment of moisture related damage.

The recommendation for AK Konsult is to apply the calculation program when it is fully developed.

Place, publisher, year, edition, pages
2014. , 37 p.
Keyword [en]
attic, moisture, annex 55, mold, damage, calculation, program, probability, stochastic, Simple Cold Attic Model
Keyword [sv]
uteluftsventilerad, vind, kallvind, fukt, annex 55, mögel, fuktskador, beräkningsprogram, stokastisk, Simple Cold Attic Model
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-149297OAI: oai:DiVA.org:kth-149297DiVA: diva2:738903
External cooperation
AK Konsult Indoor Air AB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Supervisors
Examiners
Available from: 2014-08-19 Created: 2014-08-19 Last updated: 2014-08-19Bibliographically approved

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