Here is  photo provided by fellow Passive House seminar attendee Paul Eldrenkamp. What you are looking at is the effect of sunlight bouncing off of the neighbor’s windows and creating a sundial-like pattern on the facade of this building. I am not sure what temperatures are needed to produce this kind of damage—I have seen damaged vinyl siding from barbeque grills that were placed too close to homes. Needless to say, I try to stay away from the product as I don’t feel that it is suited for a quality building.

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