Cemesto is a sturdy, light-weight, waterproof and fire-resistant composite building material made from a core of sugar cane fiber insulating board surfaced on both sides with asbestos and cement. Its name is a portmanteau word combining "cem" from "cement" and "esto" from "asbestos." A type of prefabricated home using this material came to be called cemestos. In addition to houses and office buildings, cemesto was used to build gasoline stations and factories.