I am installing a vinyl replacement window (30 1/4 inches by 44 1/4 inches) and the rough opening is 30 3/4 inches by 45 inches. I have taken out the old window and I have fit the new one into the rough opening.
My question is: Does the new vinyl window allow for extension left to right and top to bottom to make it flush with the rough opening? Is there a screw(s) to modify the dimensions of the window once the installer has it in place. I know I have to caulk the inner perimeter of the window once it is fully installed.