Nick,

I think that's a concrete filled form... I HOPE so, anyway.

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Sean,

That's very recent work, all nice and shiny like that... in addition to all the symptoms Markus listed, the ducts right above it are badly rusted, which gives you a standard of comparison. This situation would be a red flag for me; did you check for other possible recent and likely unpermitted work, especially new kitchens and baths? Did you note to your clients that it may not have been permitted, and recommend they check?

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Michael Thomas
Paragon Property Services Inc., Chicago IL
http://paragoninspects.com