Vägglag

Vägglag (literally “wall layer”) is a Swedish term used to describe the layered construction of a building wall. It emphasizes that a wall is an assembly of components arranged from the exterior surface to the interior, each serving functions such as protection from the weather, thermal insulation, moisture management, structural support, and acoustics. In practice, vadg would be considered a system of layers rather than a single material.

Common layers in a vägglag include an exterior cladding or facade, a weather- or moisture-protection layer, insulation, a structural wall or frame, and an interior finishing layer. Often there is an air or ventilation gap to manage moisture and temperature gradients. Materials vary by climate and tradition, with options such as brick, timber cladding, mineral wool or foam insulation, and gypsum boards or wood panels for the inner finish. Some constructions also incorporate a dedicated vapor barrier to control moisture diffusion and an airtight layer to improve energy efficiency.

Swedish wall constructions range from timber-frame walls to solid masonry and insulated concrete forms. Modern practice focuses on reducing thermal bridges, ensuring effective moisture handling, and achieving reliable airtightness, frequently using prefabricated wall elements and controlled ventilation with heat recovery.

Standards and practices are guided by Boverkets byggregler (BBR), the Swedish Building Regulations, which establish requirements for energy performance, moisture, fire safety, and structural integrity. Sustainability considerations influence vägglag design, including the use of renewable materials like wood and high-performance insulation, as well as prefabrication to improve quality and construction speed.