Masonry is the builing of structures from individual units laid in and bound together by mortar, and the term "masonry" can also refer to the units themselves. The common materials of masonry construction are brick, stone such as marble, granite, travertine, limestone; concrete block, glass block, and tile. Masonry is generally a highly durable form of construction. However, the materials used, the quality of the mortar and workmanship, and the pattern the units are put in can strongly affect the durability of the overall masonry construction. Masonry units, such as brick, tile, stone, glass brick or concrete block conforming to the requirements specified in the 2006 International Building Code (IBC) Section 2103.