CLT envelope works hygrothermally safe if the panel is not covered by material layers that cause moisture accumulation on the CLT surface, which in turn increases the risk of moisture damage. The most critical period is the start of the service life immediately after construction when the CLT moisture content equilibrates and the excess moisture dries out. In addition to the drying capacity, the airtightness of the building envelope must also be ensured, for which in many cases an internal airtight membrane is used. General recommendations are usually given for the use of the membrane. Mainly to use “low” water vapor resistance products. The objective of this research was to analyze the effect of the internal airtight membrane on the dry-out performance of the vapor-permeable CLT external wall and to find the parameters of water vapor resistance at which the sufficient dry-out is not prevented.
Keywords: CLT envelope, moisture accumulation, airtight membrane
Authors
Villu Kukk
Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
Jaan Kers
Department of Materials and Environmental Technology, Tallinn University of Technology, Estonia
Targo Kalamees
Login to download the PDF