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Vindar med begränsad ventilation - Fukttekniska undersökningar
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics, Byggteknik.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Tougher fire requirements and the desire to make

simpler designs have enabled construction companies

to go from the traditional well-ventilated attic to attic

with limited ventilation. Theoretically limited ventilated

winds should perform well. The problem you see if there

is construction moisture or external moisture sources.

Problems may occur when the small ventilation is not

able to remove moisture to the extent necessary.

Heavier constructions usually have a large amount of

construction moisture in the attic floor, which can be

transferred to the attic space. Heavier structures with

limited ventilated attics have not been studied


AK Consulting was commissioned to evaluate five attics

to a construction company erected in 2014 and 2015.

Former investigations showed that there was a risk

initially with respect to the excess moisture from

building moisture. This study was carried out with

theoretical calculations on a model of an existing attic

with moisture problems.

The present thesis was commissioned by AK

Consulting. It evaluated the data and reports from the

five attics and assesses them with the help of WUFI BIO

and made theoretical calculations in WUFI.

The study shows that attics with limited ventilations

work well initially and that the ventilation of the attic

does not lead to drier attics. Longer measurement

periods are required in order to see how the wind works

in the long term and in different outdoor climates. It is

difficult to determine the effect of initial

dehumidification of the winds. The attics have little or

no excess moisture over the measurement period.

The recommendations are to dehumidify attics initially

until further studies have been done on similar

structures. It is also important to continue monitoring

the attics in this study to follow up how they work in the

long term and during years with different climatic


Place, publisher, year, edition, pages
National Category
Building Technologies
URN: urn:nbn:se:uu:diva-298216ISRN: UTH-INGUTB-EX-B-2016/03-SEOAI: diva2:945207
Educational program
Bachelor Programme in Construction Engineering
Available from: 2016-07-04 Created: 2016-06-30 Last updated: 2016-07-04Bibliographically approved

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