About Dexkorvo

What this site covers

Dexkorvo is a reference resource focused on one narrow topic: the selection of energy-efficient windows for buildings in Poland. The content covers three areas — glazing types (single, double, and triple pane), window frame materials (uPVC, aluminium, timber), and the thermal performance regulations that apply under Polish building law.

The site does not sell windows or recommend suppliers. It does not carry advertising. Content is produced using publicly available technical standards, manufacturer documentation, and regulatory texts.

Why this topic

Windows represent a disproportionate share of building heat loss relative to their area. A single-pane window loses heat roughly four times faster than a well-insulated wall section. The 2021 update to Poland's technical building conditions (Warunki Techniczne) introduced a maximum whole-window U-value of 0.9 W/m²K — tighter than many existing buildings can meet without replacement. Understanding what the regulations require, and what product specifications correspond to compliance, is useful for anyone specifying or replacing windows in Poland.

Content accuracy

Technical figures cited on this site are drawn from published standards (EN 673, EN ISO 10077, EN 14351), manufacturer technical documentation, and official regulatory texts. Where exact figures depend on specific product configurations, this is noted. U-value ranges are indicative; certification data from specific manufacturers or independent testing laboratories should be used for compliance purposes.

The site does not publish statistics, research findings, or claims that cannot be traced to a named publicly available source. If a claim would require inventing a figure, the content uses qualified language rather than a specific number.

Updates

Regulatory content is reviewed when significant changes to Polish building technical conditions or EU EPBD requirements occur. Product and materials content is reviewed periodically. Each article displays its last-reviewed date.