Ok guys here it goes, I would like to replace old early 80s horizontal aluminum windows in my house. The exterior is wood siding and the trim around the window exterior is basically 2x4s. On the inside the jamb is wood. I believe they have a nailing fin under the exterior 2x4 trim. My question is, if I pull the sliders out and install a replacement, you will still see the old window frame. If I pull out the old frame there would be a decent size gap between the new replacement and exterior trim. I would think the proper way to do this would be to pull off the exterior trim and install a new, new construction style. If that is the case what would be the most accurate way to measure the rough opening. Am I right on any of this?
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