This is a varying problem. Sometimes a little Chinese Drywall causes big symptoms. Sometimes lots of Chinese Drywall causes only minor symptoms. The measurable effects of Chinese Drywall are determined by where the Chinese Drywall is installed in the home, the ventilation and airflow.
If the Drywall is installed around an HVAC system, the reduced sulfur gases can be spread more efficiently throughout the home.
If some portions of the house have symptoms but not others, the tainted Drywall might only be in the location of the symptoms. It is possible for one room of a home to be completely finished with Chinese Drywall, and the ceiling of another room to have only one sheet.
A thorough visual, and destructive, if needed, inspection of the home will reveal the extent of Chinese Drywall installed, no matter how pervasive or elusive the symptoms.
