When you discover you have corrosive Chinese drywall, it can be overwhelming.  The experts at CDS, LLC will help you through the next steps to determine the best strategy for you.  


Mapping is a very detailed process where the inspector analyzes every wall of the property to determine which walls/ ceilings need to be removed and cleaned of all drywall, dust and debris.  This service is critical if you are preparing to remediate the property.   The walls will be marked with permanent marker alerting the contractor which walls/ceilings/areas must be removed and the areas behind thoroughly cleaned. 


There are numerous class action lawsuits that have been filed against the Chinese manufacturers of the corrosive drywall.  Make sure you contact an attorney to learn your legal rights and options.  In most cases, the drywall labels indicating the brand of corrosive drywall must be documented and the evidence must be preserved.   If you have reactive drywall  and plan to remediate, sell or even walk away from a home in foreclosure, it is absolutely critical to consult an attorney and take steps to preserve evidence to protect any future claims before taking any action.   


Preserving evidence is needed to protect your interests if you are pursing any type of legal action.    The Pre-Trial Order No. 1(I) through the United States District Court Eastern District of Louisiana must be strictly followed.  Having an independent third party professional properly preserving your evidence is critical.  If this is not performed or done correctly, you could jeopardize the evidence.  The manufacturers and suppliers may claim the evidence was damaged and avoid compensating your for your losses. 

CDS, LLC will obtain, document and store (if needed) the evidence per the pre-trial order on your behalf.  

Post Remediation Verification – This is probably one of the smartest steps you can take if you are planning to remediate a property with corrosive Chinese drywall.  CDS, LLC works for the owner, providing an independent, 3rd party inspection by a licensed engineer that includes detailed documentation verifying that properties are free and clear from reactive or corrosive drywall.  

Our company does a complete inspection BEFORE the new drywall is replaced to ensure the all the corrosive drywall, dust, and debris were properly removed.  If the drywall was not removed properly, CDS, LLC will instruct the contractor on what is deficient and make sure corrections are made.  Once everything is completed you will receive a signed Clearance Certificate signed and sealed by a Professional Engineer.    All this documentation will be critical especially if you plan to sell the property at a future time.  


If a property has already been remediated, it's very difficult to know if the job has been done correctly after the drywall has been replaced.  The best way to analyze this type of situation is our Environmental Corrosion Testing or ECT.  Our state of the art method for environmental corrosion testing is the analysis of deposited sulfur on copper and/or silver coupons utilizing x-ray florescence.  The sulfur is a byproduct of the corrosion of the metals from sulfide gases.  Corrosive drywall emits sulfide gases that react with copper and silver to form copper sulfide and silver sulfide respectively on the surface of the test coupons.  Neighboring porous materials will also emit sulfide gases for a limited amount of time due to the exposure to corrosive drywall gases.  The de-absorption process is a critical part of the remediation in order to avoid problematic corrosion of new copper materials that could indicate a false positive for the presence of corrosive drywall.  Testing is done after the de-absorption process and/or treatment for the absorbed gases.  The process of the gases reacting with the test coupons is accelerated utilizing forced air over a set period of time. 

ECT Procedure
Several ECT devices are set inside the main areas of the property and fan(s) are utilized to circulate the air to ensure there were no stagnant pockets of air.  The property must remain vacant and can not be entered during the entire testing process.  The testing is seven (7) days.  Various measures were taken to prevent other potential sources of sulfide gases interfering with the testing.  Other potential sources include sewer gases, gas burning appliances, kerosene heaters, wood or coal stoves, tobacco smoke, malfunctioning chimney’s and outside air entering inside the property. 

After the testing period is completed the coupons are then analyzed using X-ray florescence (XRF)  to quantify the sulfur deposits on the coupons in ug/cm2 (micrograms per square centimeter).  Readings can then be interpreted to determine the presence of sulfide gases that may be present within the subject property.  A non-detect (ND) reading upon analyzing the test coupons indicates there are no detectable sulfur deposits on the surface of the coupons.   This in turn leads to the conclusion that there are no sulfide gases present at any significant or detectable levels during the course of the exposure period.   Positive readings for sulfur are compared against various controls and environmental conditions to draw comparisons and interpret results.