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XPS - Extruded Polystyrene
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Nova’s online store offers XPS extruded polystyrene boards in a range of thicknesses and pack sizes. The material is used for thermal protection in buildings, but choosing a board based on its name or thickness alone is often not enough. The installation area, type of construction and whether the board will remain exposed to direct sunlight are also important factors.
Choosing the right XPS is a key step in improving the energy efficiency and long-term performance of building structures. Extruded polystyrene, or XPS, consists of rigid closed-cell boards known for their high strength and moisture resistance. Unlike conventional foam polystyrene, material produced by extrusion absorbs virtually no moisture and maintains its dimensional stability even under demanding climatic conditions.
Where is Nova XPS used and how is the right thickness chosen?
Different structural applications require different load resistance and board thicknesses. In foundations, basement walls and underfloor heating systems, high-strength boards can be installed beneath concrete screed because their high compressive resistance prevents settlement. Thinner boards are used for internal partitions and ceilings where saving space is a priority.
Made to local standards, Nova-manufactured products allow materials to be selected according to specific dimensional requirements and load classes (TIP1500, TIP2000). Choosing the correct size helps prevent thermal bridging and noticeably speeds up installation.
How does extruded polystyrene differ from traditional materials?
The main differences of extruded polystyrene lie in its manufacturing technology and physical-mechanical properties. Thanks to its closed-cell structure, XPS insulation has a high water vapour diffusion resistance factor (μ = 90-100) and low thermal conductivity (0.030-0.035 W/mK), helping the material retain its thermal resistance even in damp environments. When a project requires both comprehensive sound insulation and thermal protection, the high density of polystyrene minimises the risk of deformation under load.
The material has an operating temperature range of -50°C to +75°C, supporting reliable performance in both extreme cold and summer heat. Chemical compatibility must also be considered during installation: the boards are resistant to acids but sensitive to organic solvents, petrol and compounds from the ether group.
What mistakes are common when installing XPS façade insulation?
A common mistake is leaving boards exposed for too long after fixing them to a façade. Because the material is sensitive to ultraviolet (UV) radiation, prolonged exposure to direct sunlight can degrade the surface layer, making timely plastering or the application of a protective layer necessary. Proper façade system performance also depends on specialised adhesive cement and correctly selected fixing dowels to create strong adhesion between the boards and the wall.
Another common mistake is overlooking the surface type: compared with smooth boards, rough or grooved-textured boards provide much better adhesion to plaster mixes. Textured boards are therefore recommended for façades and for covering beams and columns.
How is the XPS price determined and what affects savings?
The final product cost is directly related to board thickness, density and the total square metres included in each pack. When planning an insulation budget, overall thermal insulation should be assessed not only by its initial cost but also by long-term energy efficiency. High-quality extruded polystyrene can noticeably reduce heating and cooling utility costs and does not require periodic replacement.
When selecting XPS boards for construction and renovation projects, the main considerations are the type of structural load, moisture level and board surface structure. Nova’s online store offers a varied selection, making it possible to choose material with the required specifications and order directly from the website.