In 2007 AIGA, the professional association for design, installed a green roof at the AIGA National Design Center in New York. Weston Solutions, Inc., was contracted to create the 1,156-square-foot GreenGrid roof system to top the four-story headquarters. Eight varieties of sedum were planted in four-inch-deep containers, lined by a walkway of recycled rubber pavers. By "greening" its roof, AIGA pursues its ongoing environmental stewardship effort.