bring to light this dependence (conductivity/water content) on many kinds building materials. The impact of moisture content on insulation thermal conductivity varies with the type of insulation depending on the composition, properties and internal structure of the materials used, which determine modes of heat transfer and the moisture storage capacity of the material [53]. The next step of our investigation is to expose different types of RSTIB to different temperatures and humidity levels depending on the prevailing climatic conditions and to evaluate their actual thermal performance when they are placed in their locations in the building envelope. The results will be presented in the coming up paper.