So what’s the culprit here? I can only speculate, but I’d put my money on shrinkage in the second-floor rim joist and wall plates. While I see this problem most often on the gable ends, it is not limited to that area. In other words, the joint that snaps the sections of siding together has become unsnapped. And on just about every one that’s more than a single story, there’s at least one wall where the vinyl siding has unlocked somewhere between the first and second floors. Now when I drive through those neighborhoods, I see many homes that still have their original cladding. By the mid-80s, new developments were popping up, and most of the houses in those communities were sided in vinyl. Mostly, we installed aluminum-usually right over the existing siding. In the early days of my career, we didn’t work on much new construction. I’ve been a siding installer since the 1970s and have had my own business since the 90s.
Shrinkage in the structure behind the siding is most likely the cause.
In older two-story homes with vinyl siding, it’s common to see siding panels that have uncoupled between floors.
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