Hi im thinking of changing the 2 upvc windows on a L shaped bay. Lower floor and upper. I've installed smaller windows before, these being by the far the biggest for me. 3m width x 1.5m high and a 500mm side panel as a L shape. I understand I need a corner post to connect the large window to the side panel. Never used a corner post before but seen they just slot in...are they just the height of window flush top and bottom or incorporated into cill ect.. And also is it better to fit cill to wall then place window and screw to cill or put cill on first which I've done in past
Thanks
Mark
Thanks
Mark