/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en 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. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1061/(ASCE) 0887-381X(2008)22:4(103) Journal of Cold Regions Engineering, 22, 4, pp. 103-123, 2008-12-01 High performance vacuum insulation panel: development of alternative core materials Mukhopadhyaya, P.; Kumaran, M. K.; Normandin, N.; van Reenen, D.; Lackey, J. C. 2008-11-19A version of this document is published in / Une version de ce document se trouve dans: Journal of Cold Regions Engineering, v. 22, no. 4, 2008, pp. 103-123 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. Construction (IRC) is investigating a number of fundamental aspects related to the performance and construction of VIP, which this paper discusses. More specifically, it reviews the underlying basics behind the functioning of VIPs and presents results from the investigation into the development of alternative core materials for VIP construction.

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en 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. Special Technical Publication, 1320, pp. 456-470, 1997 A Logical extension of the ASTM standard E96 to determine the dependence of water vapour transmission on relative humidity Lackey, J. C.; Marchand, R. G.; Kumaran, M. K. ASTMhttp://www.nrc-cnrc.gc.ca/irc A Logic a l e x t e nsion of t he AST M st a nda rd E9 6 t o de t e rm ine t he de pe nde nc e of w a t e r va pour t ra nsm ission on re la t ive hum idit y NRCC-40105Lackey, J.C.; Marchand, R.G.; Kumaran, M.K. April 1997A version of this document is published in / Une version de ce document se trouve dans: Special Technical Publication, 1320, pp. 456-470, April 01, 1997 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-42 ASTMLes 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 It is well koowo that the water vapour transmission properties of hygroscopic building materials depend on the local relative humidities(rh). Traditionally, the ASTM Standard E96 specifies only two conditions of rho The dry cup method in the standard corresponds to a mean rh of 25 % and the wet cup to 75 %. This information is not enough to describe the behaviour of the material through the entire range of rho European standards have already proposed an extension of the existing standard to address this issue. ASTM standard should follow this change. A logical extension of the E96 standard to include the effect of rh on water vapour transmission properties has been proposed and is being discussed by one of the C16 Committee Task Groups. This paper presents the application of the proposed extension to several common building materials. The details include the operating principles of a constant temperaturerh chamber and the effects on the test results, of the vapour resistance offered by still air inside the cup, the surface resistanc...

Polyisocyanurate (polyiso) foam insulation with impermeable facers is known for its superior insulating properties in building envelope applications. The impermeable facer on both sides of polyiso foam insulation board is designed to increase and maintain the long-term thermal resistance (LTTR) of the insulation. Currently, the Institute for Research in Construction (IRC)/National Research Council (NRC) of Canada, in association with the Canadian Polyisocyanurate Council, has embarked on a research project to develop a standard test methodology that would help to quantify the design LTTR value of polyiso foam insulation boards with impermeable facers. This paper outlines the research project and presents preliminary test results from experimental work. These preliminary results are discussed with a view to developing a methodology that will be used as the basis for a National Standard in Canada for the determination of LTTR of polyiso foam insulation with impermeable facers.

With the advent of high power personal computers, hygrothermal computer models have become powerful tools for building physicists and building practitioners alike. Researchers active in the field of hygrothermal analyses have developed many such models in recent years (Hens, 1996; Trechsel, 2001). All these models require a set of very reliable inputs to yield meaningful results. Among these inputs include the properties of the building materials. The most commonly used properties today are those from an International Energy Agency Annex (Kumaran, 1996). As building materials evolve there is a need for continuous updating of the information on their hygrothermal properties. At the Institute for Research in Construction two recently concluded projects have generated detailed information on the hygrothermal properties of more than 70 building products that are currently used in Canada and the United States of America (Kumaran et al. 2002a, Kumaran et al. 2002b). One of these projects (Kumaran et al. 2002a) was specifically looking at the ranges of the properties shown by contemporary products in North America. The products chosen included wood and wood based materials, bricks, mortar, stucco and building membranes. This paper reports only the information on wood-based products such as oriented strand board (OSB), plywood, wood fibreboard and wood siding. The properties that have been measured in both projects include: thermal conductivity equilibrium moisture content water vapour permeance water absorption coefficient moisture diffusivity and air permeance

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