Wood sorption, capillary condensation and their implications for building envelopes of wood construction

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Conference13th Canadian Conference on Building Science and Technology: 10 May 2011, Winnipeg, Manitoba
Pages113; # of pages: 13
SubjectMoisture transport, wood construction, building envelopes; Moisture performance
AbstractThis paper reviews the existing knowledge and a number of controversial issues concerning the relationship between wood and moisture, around basic concepts such as adsorption/desorption, capillary condensation, and the fiber saturation point. It starts with characteristics of wood micro-structure, with a focus on the pores in cell walls, followed by sorption in wood cell walls, the potential for vapour condensation at high relative humidity (RH) conditions, the measurement of wood equilibrium moisture content (EMC) at different RH levels and the concept of fiber saturation point. The discussion is then focused on the potential impact of a number of wood structure and use-related factors on the measurement of EMC under near-saturated RH conditions, particularly about the use of the pressure plate method for predicting the moisture content of low-permeance softwood species. Recommendations were provided on further studies on EMC measurement and EMC testing methods. The intent of the paper is to improve the understanding of wood properties and behaviour in building applications, and emphasise the importance of moisture management in building envelopes.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number54434
NPARC number20373810
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Record identifierda01dd4d-2fd0-4994-8c8b-7beb7c2c8584
Record created2012-07-23
Record modified2016-05-09
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