Uloskerros

Uloskerros is a Finnish term that denotes the outermost layer of a structure, product, or material. The concept centers on the surface that faces the external environment or the outside of a multilayer assembly. Its precise meaning depends on the context, but the common ideas are protection, weather resistance, and visible appearance.

In construction and building technology, uloskerros refers to the external protective layer of a wall or facade. This layer is designed to withstand weather, UV exposure, and mechanical wear, while providing an interface to the interior. Typical uloskerros materials include brick, wood siding, fibre cement boards, metal panels, and external plaster. The outer layer is often installed with a ventilation gap and is paired with an inner layer (sisäkerros) to manage moisture and insulation. Durability and performance depend on material choice, exposure, and maintenance practices.

In textiles, uloskerros describes the outer shell fabric of a garment, particularly outerwear. It is selected for properties such as windproofing, water resistance, and durability, and is usually combined with a lining and sometimes an insulating layer.

In other engineered contexts, uloskerros can denote the outer coating or protective surface of components, influencing aesthetics, corrosion resistance, and wear. The term is widely applicable but its exact definition is defined by the specific field and the surrounding multilayer structure.