On Feb 16, 3:52 pm, wrote:
We moved into a house where the existing vinyl windows were not
installed correctly. Wind comes in between the window and the
casing. On one window, the top one falls down as soon as it is
unlocked. I have already tightened the adjustor screws as much as
possible, but it is not enough. I believe the only way is to shim the
window. I am looking for the best/easiest way to do this. I am up
for any ideas. Thanks

Do you have a complete vinyl window assembly or just vinyl replacement
sashes? The problem you described sounds like poorly installed
replacement sashes. Trying to improve the situation may be nearly
impossible by jiggering the framing. Consider getting some quotes from
a reputable contractor for remedies, then decide the best cpourse of
action. Good luck.

Joe