I got a call for a water intrusion evaluation. When I got there, I knew this was not water…the residue was oily and sticky. My first thought was a honey bee hive in the wall, but no evidence of bees flying around above the wall. Not urine either. Owner noticed this just in the last few weeks.
This is a frame wall separating the rear porches on a townhouse building. No refrigerant lines above. After a little head scratching, I noticed that the slab had been treated for termites and then asked the owner when this was done. He said about 4-5 years ago. Could this be pesticide oozing out of the cold joint after all this time? I did take a bulk sample and was wondering if EMSL can identify the substance for me. I will call tomorrow, but has anybody seen this happen before, or could it be something else?