Frontiers of Architectural Research >
Vapour retarders in wood frame walls and their effect on the drying capability
Received date: 06 Dec 2012
Accepted date: 11 Dec 2012
Published date: 05 Mar 2013
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Wood frame walls typically need a vapour barrier at the warm side to avoid interstitial condensation due to vapour diffusion and air leakages from the interior. A more vapour open material than the traditional vapour barriers, here called vapour retarder, could allow condensed moisture, built-in-moisture or moisture from minor leakages to dry to the interior in addition to the outward drying. The application of permeable vapour retarders in wood frame walls have been investigated in this study by the use of a hygrothermal simulation tool. A traditional wood frame wall usually has good drying possibilities to the exterior. If a vapour etarder should have an effect on the total drying, it must not be too vapour tight. The purpose of this study was to find some threshold value for the maximum vapour resistance of a vapour retarder—when arequirementisthatitshouldhavearelativelylargeeffectofthetotaldrying of the wall. The increased risk for condensation as the vapour resistance decreases has however not been investigated in this study. In general it was found that permeable vapour barriers have relatively little effect on the total drying of ordinary wood frame walls in a Nordic climate.
Key words： Vapour barrier; Vapour retarder; Wood frame wall; Drying; Moisture
Stig Geving , Jonas Holme . Vapour retarders in wood frame walls and their effect on the drying capability[J]. Frontiers of Architectural Research, 2013 , 2(1) : 42 -49 . DOI: 10.1016/j.foar.2012.12.003
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