The reason is that the wood gives way. All Outline elements are made with Scandinavian pine tree wood. As wood is a natural material, e.g., made of living material, it will work according to the season and therefore it may be necessary to adjust its elements during the course of the year.
In the autumn/winter, there is greater humidity, which means that the elements will ‘expand’. Therefore, the windows should be adjusted to achieve the right functionality despite temperature fluctuations and changes in humidity. Perhaps the strike plate needs to be loosened so that the window does not tighten or bind, thus achieving a better seal.
In the spring and summer, the elements will work the opposite way, because during this time there is not so much airiness as during the winter.
HOW TO SOLVE THE PROBLEM
How to tighten or loosen a top guided window
A top guided window can be tightened or loosened by turning the screw in the sliding block on each side. The screws must be tightened equally on both sides, otherwise the frame may be out of alignment.
The frame on the Daylight window with top-control can be adjusted in height. This is done using a 4 mm allen key.