läpivetä

Läpivetä is a Finnish term that translates to "draft" or "through-draft." It commonly refers to an unintended flow of air through a building, often entering through gaps, cracks, or openings in the building envelope. This can occur in various parts of a house, including windows, doors, chimneys, ventilation systems, and even where different building materials meet.

The presence of läpivetä can lead to several undesirable consequences. It can cause significant heat loss, making buildings colder and increasing energy consumption for heating. Conversely, during warmer months, it can allow hot air to enter, making the interior uncomfortable. Drafts can also contribute to the spread of dust and allergens, and in older buildings, they might indicate issues with structural integrity or insulation.

Identifying läpivetä often involves simple observation of air movement or the use of specialized tools like smoke pencils or infrared cameras. Addressing drafts typically involves sealing any identified air leaks. This can range from caulking around windows and doors to more extensive insulation work and proper sealing of ventilation components. Minimizing läpivetä is a key aspect of improving a building's energy efficiency and indoor comfort.