Concrete
Currently, most concrete tile manufactured in North America is produced in automated extrusion plants. Typically, semidry concrete mixes composed of Portland cement, water, and sand or fine aggregate are mixed and then extruded under high pressure. Typically, color is added by mixing mineral oxide pigments with the base materials or by spraying the color on the surface after the concrete has been extruded. Cementitious glazes containing pigments also are used where glazed surfaces are desired. The concrete tile is put into a kiln for drying. The surfaces of some tiles also are sprayed with sealers. 
 

Manufactuers

		http://www.eagleroofing.com
		http://www.monierlifetile.com
		http://www.hansonrooftile.com
		http://www.auburntile.com