Advantages of high performance building envelopes with exterior insulation are getting to be recognized in Japan and there exists several projects completed so far. However those envelopes are not yet quite popular in the construction marcket since they require a cost increase of 10% or higher. In order to develop a high performanse building envelope with an affordable cost, quality quantifications are very important for various kinds of construction methods on building wall assemblies with exterior insulation. Multiple performances, such as thermal resistance, thermal inertia, moisture resistance, moisture buffering and hygro-thermally induced dimensional change are to be quantified for better understanding on the coupled phenomena. In the context described above, three specimens with different kinds of exterior insulation practices and a specimen for their reference were made and installed on the interface partition of a dual climate chambers in Kyoto Institute of Technology, and longterm measurement over six months have been carried out under transient hygro-thermal boundary conditions generated by the indoor and outdoor chambers. In this paper, experimental results on hygro-thermo-mechanical responses of wall specimens with exterior insulation will be presented. In order to quantify transient hygro-thermo-mechanical changes, four specimens were made with about 140 sensors deviced in. Measurements have been carried out to record and analyze the complete responses of hygro-thermo-mechanical status for each specimens, which allow us to establish a trial benchmark data for developing a fully linked mathematical model of hygro-thermo-mechanical changes on building materials． Two kinds of inorganic insulation materials are specially forcused in the experiment, which are popular in the cohesive exterior insulation detail in Japan. The most practical advangtage for these materials is that adhesive tile finishes can be applied on these underlays. However they are generally applied in the molding installation and supposed to be less permeable than EPS and finish mortars used in EIFS. This implies negative effects on the drying process of the internally captured moisture at the casting time. These insulation materials were installed in the specimens and thier hygro-thermo-mecanical characteristics have been quantified in the experiment. Recorded strain data will clarify the mechanical movement of adhesive mortar between tile and the underlay insulation materials with respect to the hygrothermal transient stuations.