Defective Chinese Drywall
This consortium…There are the only five known inspectors, in the greater Houston area and 8 surrounding counties, which are competent to guide an owner thru this process. No other group has spent sufficient research time and sufficient "hands on" experience to develop this help. This research continues because Chinese Drywall continues to be an evolving problem where answers are being found everyday.

 


 

Chinese (Tainted) Drywall

Chinese Drywall Inspectors

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"Identification"

CPSC
The identification process is two steps:
(1) an initial or threshold inspection
visual signs of metal corrosion
evidence of drywall installation during the relevant time period
(2) the identification of corroborating evidence or characteristics.
CPSC Identification Protocols

http://www.cpsc.gov/info/drywall/InterimIDGuidance012810.pdf

Physical indicators

Smell
Colors on sheetrock paper
Names on back of sheetrock
Eagle emblem
Smell
Blackened wires
Tarnishing of any exposed or unexposed metals
Lighting problems
Wiring in electronics and appliances
Stove elements
A/C & electrical failures
Hurricane - Flood - Storm homes
New or remodels since 2001
Peak years 2003 to 2007

Who Made This Problem?

The following list identifies the top 10 drywall samples tested that had the highest emissions of hydrogen sulfide, along with the identity of the manufacturer of the drywall and the year of manufacture, from highest to lowest.

Knauf Plasterboard (Tianjin) Co. Ltd.: (year of manufacture 2005) China
Taian Taishan Plasterboard Co. Ltd.: (2006) China
Shandong Taihe Dongxin Co.: (2005) China
Knauf Plasterboard (Tianjin) Co. Ltd.: (2006) China
Taian Taishan Plasterboard Co. Ltd.: (2006) China
Taian Taishan Plasterboard Co. Ltd.: (2006) China
Shandong Chenxiang GBM Co. Ltd. (C&K Gypsum Board): (2006) China
Beijing New Building Materials (BNBM): (2009) China
Taian Taishan Plasterboard Co. Ltd.: (2009) China
Shandong Taihe Dongxin Co.: (2009) China
Source CPSC.gov

Other Chinese drywall samples had low or no detectable emissions of hydrogen sulfide as did the drywall samples tested that were manufactured domestically.

Knauf Plasterboard Tianjin
Tiger
ShiGao JianCa
USG Corporation
Guangdong Knauf
Knauf Plasterboard (Wuhu)
CertainTeed Corp.
Georgia Pacific Corp.
Dragon Brand, Beijing New Building Materials Co.
CertainTeed Corp.

Pingyi Baier Building Materials Co. Ltd.
Panel Rey S.A.
Lafarge North America
National Gypsum Company
National Gypsum Company
Georgia Pacific Corp
Pabco Gypsum
Temple-Inland Inc
USG Corporation

 

This consortium has tested patch and badge type H2SO testers in several homes with no conclusive or satisfying results and would advise not depending on them for identification.


 

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