What turns windows into airtight windows?
The air tightness of a window depends decisively on the number of sealing levels. In order for windows and doors to be airtight, the airtightness tapes must also be cleanly applied on the building site. For buildings with increased requirements, it is recommended that an airtightness concept be drawn up during the implementation planning phase. The a-value is used to measure the air tightness, which is used especially for testing windows and doors (DIN EN 12207).