My husband and I installed windows that were salvaged and have a problem keeping the top sash in position when we open the bottom sash for ventilation. These are new windows and of high quality but we do not know the manufacturer to research this. I've gone as far as cutting 1" x 1" sticks to wedge under the to sash to keep it opened. This is not the best looking option, and the sticks do not stay in place and fall down between the screen and window. Is there an inexpensive alternative to my sticks...? I've even thought of screwing in screw to hold up the sash but did not want to pierce the seal membrane. Any suggestions would be greatly appreciated. nrogers

First you say they are salvaged windows, and then you say they are new windows...I'm confused. What method is supposed to keep the sash where you want them? Window weights in the wall, with rope and pulleys? Or metal friction tracks? If it's the friction tracks, they should be adjustable for tightness. Look for a screw about midway up the jamb...that's the adjusting screw.

What are the windows made of? Wood, plastic, metal?
Depending on the type they are, will determine the fix.