The installation of windows and exterior doors really is a science in its own right today.
To improve the energy effi ciency of buildings, a number of standards and regulations have
been issued that place high requirements not only on the tightness of the external
envelope but also thermal and acoustic insulation as well as optimal weather protection.
The [German] Energy Saving Ordinance in particular stipulates in this conjunction that
“the heat transmitting, enclosing surface, including joints, are to be sealed so that they
are permanently airtight in accordance with recognised rules of technology” (EnEV, § 6
– clause (1), Tightness, Minimum Air Exchange).
Constructions Refurbishing Wet-Applied Sealants