MOISTURE PERFORMANCE OF TIMBER-FRAMED EXTERNAL WALL STRUCTURES

摘要

This research looks into the moisture behaviour of different timber-framed external wall structures under Nordic climate conditions. Wall structures were studied under laboratory conditions using new test equipment built in connection with the study. The behaviour of structures can be analysed under computer-controlled conditions without disturbances. The objectives of this study is to find out how different wall structures absorb moisture and also how they dry. The study examined, for instance, condensation and mould risks, the need for a vapour barrier in wall structures, and the impact of pressure difference on the behaviour of structures. The study focused mainly on two wall structure types: a cellulose insulation wall with a air barrier and mineral wool insulated wall with a vapour and air barrier.