I've been given the chore to replace 2 windows for a homeowner. The PVC windows have nailing flanges that are too wide for the opening. The window itself without the flange is 1" too narrow in width and depth. The old window bucks have wood frames set in the concrete of the basement. Can someone help in pointing me on the correct way to install this window. I was thinking I had to take off the flange and somehow adhere the raw window(without nailing flange) into the opening. Maybe install PT plywood in the opening but that's only 1/2" on all sides. Then I still have to figure out how to get the jamb adhered to the new buck. The PVC window is a hollow frame. So screwing into its sides and top is not going to work. I've cruised the forum here and You tube but not much luck.
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