Glass unit masonry, standard units must be at least how thick?

The correct answer is based on the requirements specified in the North Carolina Residential Code regarding the thickness of glass unit masonry standard units. Glass block units used in construction must meet a minimum thickness of 3-7/8 inches to ensure structural integrity and performance under load. This thickness is specified to provide adequate strength, durability, and insulation properties, as well as to comply with safety standards in residential construction. Thicker units can provide increased resistance to impact and stress, which is essential in maintaining the longevity and safety of architectural features that incorporate glass masonry. Other thickness options listed do not meet the established minimum requirement, rendering them unsuitable for use in compliance with code standards.