Prof. V. Peixoto de Freitas Building Physics Laboratory, Department of Civil Engineering Faculty of Engineering of University of Porto Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal vpfreita@fe.up.pt Dr. J.M.P.Q. Delgado Building Physics Laboratory, Department of Civil Engineering Faculty of Engineering of University of Porto Rua Dr. Roberto Frias, s/n 4200-465 Porto, Portugal jdelgado@fe.up.pt Dr. Michael Lacasse National Research Council Canada (NRC/ CNRC) Institute for Research in Construction Ottawa, Canada Michael.Lacasse@nrc.ca