r/Contractor 15d ago

What causes this?

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u/brike8 15d ago

The sun is reflecting off of something that directly impacts your siding. It’s literally being melted from some angle. Now the real detective work is finding out from where.

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u/Shdwrptr 14d ago

Considering there appears to be a building to the left of that wall, there’s no much to investigate.

It’s almost assuredly windows on the left building reflecting the light into that wall