Silly windows

We have windows that are more or less well made. Theres one thing that is not great: when it rains they leak: water passes under the windows. Can you see why, as engineer Jansen did? (These windows open to the inside.)

Yes, the window sill is highest outside, and every step to the inside is one centimeter lower. So any water that reaches the underside of the windows will want to come inside, and it does. Very silly.

There are wooden slats at the bottom of the windows, even with anti-capillary grooves, but they don't work, as the window sill is quite wide and horizontal. It should have been slightly tilted so water drains away. It isn't, and the water doesn't, and will reach the bottom of the windows, and leak inside. More than enough to thoroughly soak a big bath towel.

Engineer Jansen screwed an extra aluminium L-profile onto the window sill, and attached a U-profile onto the bottom of the windows, so water will drain off off the U-profile, on the outside of the L-profile. There it will drain away. At least it should not reach the inside of the house any more.

Now eagerly awaiting rain