I moved into me home about 10 years ago (1999). Certainteed Sliders (Vinyl Inserts) had been recently installed by prior home owner but I do not know when. Many window did and still had labels on them with size info and installer or purchaser info. The miters on some of the frames are separating to the point you can see thru them. The seals around the glass is separating at the corners on both the inside an outside portion of the windows. No window leaks but air..yes. The best thing I like about the windows is the locking mechanism (Better than what I have seen on Andersen, Marvin and some others. The windows still slide fairly well and the vinyl still appears to be white. As a am starting to replace with new construction windows I am leaning toward the Marvin Integrity Ultrex or Wood-Ultrex. I do not know if Certainteed has improved over the years but I am not going the find out.
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