Räystäs

Räystäs is the overhanging edge of a roof that projects beyond the exterior walls of a building. The term is used in Nordic languages, including Swedish and Finnish, to describe the horizontal line formed by the roof edge as it shelters the wall below. The overhang is typically supported by the roof structure, such as rafters or a timber or metal framework, and is finished with elements like a fascia board and, on the underside, a soffit. A rain gutter is commonly mounted along the outer edge to channel water away from the wall.

The räystäs serves several practical purposes. It protects the wall from rain and snow, helps shade fasades from direct sun, and reduces moisture-related damage. By extending the roof, it can contribute to thermal management around the wall, aiding in both cooling and drying of exterior surfaces. Proper ventilation at the eaves is important to prevent condensation in attics or roof spaces, which may be addressed with ventilated soffits or other design features.

Construction and appearance vary with climate and style. In traditional Nordic architecture, räystäs depths are often noticeable, and exposed rafters or decorative timber work may be used. Modern designs sometimes tuck the overhang behind a boxed soffit or minimize the projection for a sleeker profile. Materials for the overhang range from timber and brick to metal and composite cladding, chosen for durability and compatibility with the building’s exterior.

See also: eaves, soffit, fascia, gutter.