A very important area in energy efficient construction is thermal insulation.Insulation has always been a demanding requirement when buildings are constructed, particularly in places where extreme climates are a common way of life.In order to achieve the highest possible thermal insulation resistance, new insulation materials and solutions with low thermal conductivity values are being developed, where the current practice is to utilize insulation materials in ever increasing thicknesses in the building envelopes.Noteworthy, very thick building envelopes are not desirable due to several reasons, e.g.considering space issues with respect to both economy, floor area, transport volumes, refurbishment issues, architectural restrictions and other limitations,material usage and existing building techniques.