Gypsum Drywall Problems
Gypsum board is known by a number of names, including drywall, sheet rock, green board, blue board or wall board. Problems with gypsum board can occur prior or after installation. Problems with gypsum board after installation are issues generally not related to the product but resulting from faulty handling or finishing, or damage caused on the construction site. There are a number of gypsum board problems, some very serious, that occur prior to installation.
Chinese Drywall
Verify the source of gypsum board before using it in a construction job, or when undertaking a remodeling project. Gypsum board manufactured in China between 2004 and 2007 has been found to contain higher than acceptable sulphur content. Referred to as "Chinese Drywall," this gypsum board emits sulfur gases that damage copper mechanisms and is harmful to humans. Identify Chinese drywall by the stamped/printed marking on the back that reads "Made in China." The predominate manufacturer of this gypsum board uses a blue and yellow label. After installation, Chinese drywall can be identified by indoor air quality testing and checking if adjacent copper mechanisms are turning black. The smell of sulfur is often prevalent in a structure with Chinese drywall. A certified building inspector and construction defect remediation specialist should be consulted for positive identification and safe removal of Chinese drywall.
Damage During Transport
Delivery, shipment, storage and moving of gypsum board can create a number of problems. Gypsum board can be cracked, broken, split, chipped or crushed. Careful handling and protection during transport ensures the gypsum board is in good condition and suitable for installation and finishing. A delivery of damaged drywall can be refused and returned to the supplier. However, sometimes broken gypsum board can be salvaged; cut broken drywall into smaller pieces suited to the project and discard unusable sections.
Exposure to Elements
Delivery, shipment or storage in wet conditions gives gypsum board a higher than acceptable moisture content. Checked with a moisture meter, 15 percent moisture is an acceptable maximum for gypsum board prior to installation. Moisture content higher than 15 percent may result in microbial growth--commonly know as mold. Job site storage, especially of gypsum board, should be monitored to ensure a quality finished project.
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