Hello,
I want to replace my old aluminum single panes with vinyl double hungs.
I pulled the inside molding off to reveal a rough opening of 36.75 wide, by 60.25 high.
I read that the windows (Certainteed bryn marw II)will be shipped half an inch smaller than the rough opening.... WHY? AND what do I fill the have inch gap with? Do I just sandwich a 1/4 inch board on each side of the rough opening and window?
thanks for any and all help! Keith