Diffusion-Open and Diffusion-Tight Internal Insulation Systems

Abstract

The current energy performance requirements extend beyond new buildings, including existing and historic buildings. Improving the thermal performance of buildings is an important factor for energy consumption reduction. Usually, an external insulation system is used in order to enhance thermal performance. This method of insulation is preferred as the safest. For listed buildings, this method of insulation is often not feasible due to legislative constraints. In such cases, internal insulation becomes an alternative, despite the number of risks it poses. New so-called capillary-active materials are currently being developed. This article is focused on the principle of diffusely open and diffusely closed internal insulation systems.