NCMA has published new guidelines for "green" (sustainable) concrete masonry units. Concrete masonry building and hardscape products can make a significant contribution to meeting LEED certification. But, when concrete masonry products incorporate recycled materials, due consideration must be given to ensure that the use of these materials does not adversely affect the quality or safety of the units or construction. NCMA's newest TEK, TEK 6-6A Determining the Recycled Content of Concrete Masonry Products provides guidelines for calculating recycled percentages to report to the design team, what can be counted as recycled content toward accumulating LEED points and other sustainability credits, and how credit can be achieved with left over units from a job site. Discussion on determining the fire rating of units produced with unconventional recycled products is also included. The TEK6-6A can be viewed and downloaded through the e-TEK site through one of NCMA's member sponsors which can be accessed through NCMA's website: www.ncma.org. Hard copies can be ordered from the NCMA publication department at 703-713-1900. For more information contact Technical Publications Director Dennis Graber.