kivivilla

Kivivilla is the Finnish term for mineral wool insulation used in building construction. It is typically made from natural rock materials, most commonly basalt, which are melted at high temperatures and spun into fibers. The resulting product is manufactured in forms such as batts, boards, or loose-fill material, and is used to improve thermal performance and sound insulation in various parts of a building.

The material is non-combustible and offers high fire resistance, contributing to the overall safety of structures. In addition to fire protection, kivivilla provides thermal insulation with a thermal conductivity commonly in the range of about 0.032 to 0.040 W/m·K, depending on product density and form. Its fibrous structure also yields good acoustic insulation, helping to reduce sound transfer between rooms and through building envelopes. While kivivilla is resistant to moisture in many applications, it is generally installed to stay dry to maintain performance and avoid mold growth.

Common applications include insulation of exterior and interior walls, roofs and attics, floors, and around HVAC services. In Nordic countries, kivivilla is widely used in new construction and renovations, often in timber-frame or masonry buildings, where space efficiency and long-term durability are valued.

From an environmental and safety perspective, mineral wool is formulated to be durable and recyclable where facilities exist. Installation should minimize fiber dust, and installers may wear protective equipment to prevent skin or respiratory irritation during handling. Kivivilla is one of several mineral wool products used worldwide for robust, fire-safe insulation.