Experimental study on hygrothermal performances of indoor covering materials

Several clayey materials were prepared in Thermophysical Laboratory of Bari. Hygrothermal properties were measured according to technical standards. In order to consider the potential of earthen materials to improve indoor comfort, the software WUFI+ was used to simulate the hygrothermal behavior of a Test Room, placed in a Mediterranean climate. The analysis was carried out considering the internal surface of the walls of the building covered by five different plasters. Results demonstrated that when considering an unconditioned scenario (without HVAC system) Clay-Straw and Lime-Bentonite lead up to a greater improvement of the hygric performances, unlike traditional coverings as Gypsum or Ceramic tiles. It can be appreciated a greater damping relative humidity and sorption capacity of the earthen coatings. However, in presence of HVAC system any significant variations occurs in terms of energy saving.