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Unread 03-09-2006, 08:24 PM   #8
Rob, P.E.
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Join Date: Jan 2006
Posts: 121
Those windows look familiar to me. Take a shot of the window with the blind and bottom sash open slightly. They look like full PVC construction and may or may not have self-flashing feature through a nailing strip. In any event, the problem with such windows is that PVC can crack, and often does with typical reasons being that the rough opening is too tight and doesn't leave sufficient thermal expansion area; the window was "gently abused" during installation causing a stress crack; the corner wasn't fused properly during manufacture; or, ice build-up caused a fracture. I can tell you how to repair the cracks if they're found...
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