The experts opinion!
“Externally beaded windows are less secure than internally beaded windows, you can remove the beads from the outside and take the glass units out.
Also, the part of a wooden window that suffers most from the weather is the bottom bead. After rainfall, water is likely to collect and sit here.
Therefore, if you do not have any external beads then the water simply runs off the glass onto the frame and away. This adds to the longevity of the finished coating too!
It is also important that an internally beaded window has a drained and vented system of glazing to ensure a long life for the glass units.