Exterior Wood-Frame Walls—Wind–Vapour Barrier Ratio in Denmark

Wood-frame walls in cold climates are traditional constructed with a vapour barrier that also constitutes the air-tightness layer. Polyethylene foil as a vapour barrier is likely used; however, other building materials can be used to obtain correspondingly sufficient properties. 1D hygrothermal simu...

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Bibliographic Details
Published inBuildings (Basel) Vol. 11; no. 10; p. 428
Main Authors Morelli, Martin, Rasmussen, Torben Valdbjørn, Therkelsen, Marcus
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2021
Subjects
Airtightness
Building materials
Buildings
Cellulose
Climate
Climatic data
Cold weather construction
Construction materials
Design
Foils
Frame structures
Humidity
hygrothermal simulation
Insulation
Mold
Mold growths
mould growth
Polyethylene
Polyethylenes
Simulation
Vapors
vapour barrier
Walls
Wind
wind barrier
Wood
Wood framed
wood-frame wall
Denmark
Finland
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Summary:Wood-frame walls in cold climates are traditional constructed with a vapour barrier that also constitutes the air-tightness layer. Polyethylene foil as a vapour barrier is likely used; however, other building materials can be used to obtain correspondingly sufficient properties. 1D hygrothermal simulations were conducted for a wood-frame structure to investigate the wind–vapour barrier ratio, and if the vapour barrier of polyethylene foil could be omitted and replaced by other materials. The results were postprocessed using the VTT mould model. The results showed how wood-frame walls can be designed with respect to internal humidity class and diffusion resistance divided into three categories: no risk for mould growth, needs further investigation, and is not performing well as the risk for mould growth is present. For internal humidity classes 1–3, the ratio between wind and vapour barrier must be about 1:5, and 1:10 for classes 4 and 5 to be on the safe side. Simulations were performed for the climate of Lund, Sweden, which were used to simulate climate in Denmark too. Nevertheless, the results are related to climate data and, thus, the location.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings11100428