Humidity

Every window must have drainage openings through which water from the space between the sash and the frame is discharged outside. Such openings are usually milled into the front part of the frame and covered with covers in various colors.

There is also the possibility to drain water outside through openings drilled in the lower part of the frame – so-called concealed drainage, which works well in combination with an external metal or aluminum windowsill with an extra nose that is screwed behind the drainage openings with a 5-chamber sill connection.

I have often seen that this was not executed correctly.

Is the base area below the threshold sealed? Here there is an interface between many tradespeople. It often happens that after removing the paving, the screed insulation can be seen from the outside.