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Control of moisture safety design by comparison between calculations and measurements in passive house walls made of wood

Författare

Redaktör

  • Vasco Peixoto de Freitas
  • Helena Corvacho
  • Michael Lacasse

Summary, in English

The use of passive house technique has been used in a new wood framed building in Sweden. Besides the positive effect of reduced energy need, highly insulated wooden houses often have a higher risk of moisture and mould problems. The reason is that critical positions is more exposed to higher relative humidity compared to ordinary houses with thinner insulation. To investigate if an external wall has been correctly designed and constructed it has been investigated both with hourly measurements and by calculations with WUFI 5.0.

The aim of this study is to investigate the result of the moisture design process and the way changes in the design influence the moisture safety with real climate conditions. The study also investigates if WUFI 5.0 is a reliable tool to use in the construction design process. This was investigated by comparisons between measured and calculated relative humidity and temperature in different positions in an exterior wooden wall from April 2009 to October 2010.

In the original design the outer wooden studs have no protecting layer from the ventilated air gap behind the façade. Results from calculations with WUFI 5.0 shows that it is sufficient with a thin protecting thermal insulation on the outside of outer studs to considerably improve the moisture conditions in the outer parts ot the wall. If we never want the relative humidity to be above the critical level, at least 87 mm of insulation have to be applied on the outside of the wooden studs.

Comparisons between measurements and calculations show that WUFI 5.0 can be a reliable tool in moisture design of highly insulated wood framed walls. To get safe results it is important to use reliable climate and correct assumption about the air flow in the air gap behind the façade material.

Publiceringsår

2011

Språk

Engelska

Sidor

25-32

Publikation/Tidskrift/Serie

Proceedings fo the 12th International Conference on Durability of Buildings Materials and Components - XII DBMC

Dokumenttyp

Konferensbidrag

Förlag

FEUP edições

Ämne

  • Building Technologies

Nyckelord

  • moisture
  • measurements
  • WUFI
  • comparisons
  • mould

Conference name

XII DBMC - XII International Conference on Durability of Building Materials and Components

Conference date

2011-04-12

Conference place

Porto, Portugal

Status

Published

ISBN/ISSN/Övrigt

  • ISBN: 978-972-752-132-6