I inspected a home today that was built in the 2004/2005 time frame. The AC evaporator coil had typical rust/corrosion; however the thin copper tubing on the evaporator coil had the black corrosion associated with tainted drywall. (see attachment). I have either seen all or none and that is the main reason for posting.
Ground wires on 5 sample outlets through out the home and metal parts, i.e. faucets, spigots, door hardware etc had no visible corrosion.
Unfortunately the refrigerator was brand new and the coils were clean.
Ceiling drywall markings over two livable areas of the home were National Gypsum which is not a Chinese drywall manufacture.
According to the latest guidance from the CPSC (March 2011), for homes built or renovated in the 2001-2009 time frame the Threshold Inspection is positive if there is Blackening of copper electrical
wiring and/or air conditioning evaporator coil and Mean ground wire corrosion
Based on the CPSC guidance, this home meets the requirements for suspect tainted drywall and therefore meets the prerequisite for Step 2, “Corroborating Evidence”
Would you agree?