tulenkestoluokitukset

Tulenkestoluokitukset refer to the classification systems used to determine the fire resistance of building materials and structures. These classifications are crucial for ensuring safety in buildings by indicating how long a material or structural element can withstand fire without compromising its integrity. The primary purpose is to allow occupants time to evacuate and to limit the spread of fire.

In Europe, the Euroclass system is widely adopted, classifying materials from A1 (non-combustible) to F (easily flammable). This system assesses various aspects of fire behavior, including combustibility, flame spread, heat release, smoke production, and the formation of flaming droplets. Each material is assigned a primary Euroclass, and depending on the specific performance, it can also receive additional classifications related to smoke production (s1, s2, s3) and flaming droplets (d0, d1, d2).

Beyond material classification, there are also classifications for structural elements like walls, floors, and beams, often expressed in minutes or hours (e.g., EI 60, REI 120). EI stands for "integrity" and "insulation," meaning the element prevents fire penetration and heat transfer for the specified duration. REI adds "load-bearing capacity," indicating it also retains its structural strength. These classifications are determined through rigorous testing by accredited laboratories and are essential for architects, engineers, and builders to select appropriate materials and design safe structures according to building codes and regulations.