tæthedstjek

Tæthedstjek is a procedure used to assess how airtight a structure or system is. In building contexts, it measures the rate at which air leaks through the building envelope when subjected to a controlled pressure difference, helping to evaluate energy efficiency and indoor comfort. In other industries, it may refer to leak testing of pipelines, tanks, or equipment to identify unintended air or gas leaks.

Most commonly, tæthedstjek in buildings is performed with a blower door or fan pressurization test. The building is sealed except for the test fan; the pressure difference is established (commonly around 50 pascals) and the leakage flow is measured. The result is often expressed as an air leakage rate (ACH50) or the airtightness class. Other methods include bubble tests with soap solution for locating visible leaks, and tracer-gas methods (such as helium or SF6) for more precise leak localization.

Interpreting results: lower leakage rates indicate better airtightness. Improving measures may include sealing gaps around windows and doors, improving insulation, and adjusting ventilation systems. Tests are often performed during construction or after finishing to ensure compliance with energy standards, building codes, or certification schemes.

Standards and practice: tæthedstjek follows international and national standards, including ISO 9972 for determining air permeability of buildings, and various testing protocols for pressure decay or tracer gas methods. The concept is widely used in energy performance assessments, new construction compliance, and safety checks for pressurized systems.