Here is something I've never seen before. New vinyl siding was put on a standard residential home 120v/60a. Over the course of 7 months the new siding started to warp or melt. This is happening only on the side where the power comes in. This seems to be isolated only to the vinyl siding only, not other materials like the window caulking or vinyl window trim. This warping or melting seems to be happening in a diagonal direction. The AHJ says it is caused by a bad ground. The house did have a bad ground to the water pipe. In my experience I cannot figure out how a bad ground could have caused this and will have to disagree with the AHJ. What do you think?
