Dave Sr. from SWISCO responded:
November 17, 2016
Hmm... there could be two reasons you're running into this problem. One is that the 26-426 was not installed properly, where the wings are put into the proper groove on the sides of the main frame of the window. The other problem could be that the main frame of the window bowed out in the middle of the frame. If that were the case, you would need to shim the center of the frame to square/plumb up the sides.
|