Abstract
Extruded polystyrene (XPS) otherwise known as a thermoplastic polymer has a closed cell structure and is often
stronger, with a higher mechanical performance. XPS is a pressed material and is sold in different thicknesses
ranging from 2 cm to 10 cm, thus having a weight that varies from 28 to 45 kg/m3 due to the force and pressure
exerted on it. In general, XPS material has very low thermal conductivity and is resistant to bending. This
material obtains typical values of thermal conductivity between 0.025 and 0.040 W/m∙K., which means that it is
ideal for surfaces that have to withstand weight, continuous traffic, etc. It is also resistant to moisture
absorption and has a homogeneous density. Other characteristics of the material are good acoustic properties,
easy assembly, and high durability over time. It should always be kept in mind that the surface where the
thermal insulation will be applied must be leveled, cleaned, and dried. Primer is applied, before placing the
thermal insulation on the surface. Then, XPS boards are placed on the surface, adhering to the corresponding
mortar.
This paper will deal with different cases of application of XPS tiles in the city of Tirana. A closer look at the
resistance of this material from the day of application until today will be analyzed. The results during the
observations showed high thermal stability of the material and no mold surface.
EPS Expanded Polystyrene, otherwise known by the Dow Chemical trademark name STYROFOAM, is a
lightweight product made from expanded plastic beads. It was first discovered by Eduard Simon in 1839 in
Germany. EPS in its composition has 95% air and only about 5% plastic. This material is used because of its
excellent properties, including good thermal insulation, good protective properties, and extremely lightweight.
EPS is inert in nature and therefore does not result in any chemical reaction. EPS is durable, strong, and
lightweight and can be used as an insulated panel system for facades, walls, roofs, and floors, as floating
material in marine construction, and as a lightweight filler in road and railway construction.
Different examples from the city of Tirana, of buildings where XPS and EPS materials are applied, are going to
be analyzed, drawing conclusions.