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NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Heritage, 1, 3, pp. 293-310, 2007-07-01 Measurement methods of moisture in building envelopes -a literature review Said, M. N.
International Journal of Architectural
NRCC-50039Said, M.N.A version of this document is published in / Une version de ce document se trouve dans: International Journal of Architectural Heritage, v. 1, no. 3, July 2007, pp. 293-310 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42
Measurement Methods of Moisture in Building Envelopes
ABSTRACTThis article reviews the methods, principles, and performances of moisture measurement in building envelopes with a focus on continuous monitoring applications. It compiles an extensive list of closely related literature. Brief examples are presented to demonstrate measurement values and a presentation approach for measured electric-resistance data. Moisture measurement methods have various capabilities. Some methods can quantify moisture content for some building materials such as timber, while also providing comparative values or changes in wetness conditions for other building materials. Other methods are used to warn of excessive wetness conditions in the envelope, particularly in hidden or difficult-to-access areas. Reviewed methods are grouped according to the measurement principle: for example, resistance, voltage, and thermal-based methods. Resistance and voltage-based sensors are most suitable for continuous monitoring applications as they can be readily connected to a data logging system. Voltage-based methods such as the Sereda and printed circuit sensors are usually used to indicate timeof-wetness of surfaces. Their main weakness is durability, which can be quite short in outdoor applications. Resistance-based methods, such as...