are one of the main methods used to date the temples, along with inscriptions. In modern rural Cambodia, the nuclear family typically lives in a rectangular house that may vary in size from four by six meters to six by ten meters. It is constructed of a wooden frame with gabled thatch roof and walls of woven bamboo. Khmer houses are typically raised as much as three meters on stilts for protection from annual floods. Two ladders or wooden staircases provide access to the house. A steep thatch roof overhanging the house walls protects the interior from rain. Typically a house contains three rooms separated by partitions of woven bamboo. The front room serves as a living room used to receive visitors, the next room is the parents' bedroom, and the third is for unmarried daughters. Sons sleep anywhere they can find space. Family members and neighbors work together to build the house, and a house-raising ceremony is held upon its completion. The houses of poorer persons may contain only a single large room. Food is prepared in a separate kitchen located near the house but usually behind it. Toilet facilities consist of simple pits in the ground, located away from the house, that are covered up when filled. Any livestock is kept below the house. Chinese and Vietnamese houses in Cambodian towns and villages are typically built directly on the ground and have earthen, cement, or tile floors, depending upon the economic status of the owner. Urban housing and commercial buildings may be of brick, masonry, or wood. Religion Cambodia is predominantly Buddhist with 80% of the population being Theravada Buddhist, 1% Christian and the majority of the remaining population follow Islam, atheism, or animism. Buddhism has existed in Cambodia since at least the 5th century CE. Theravada Buddhism has been the Cambodian state religion since the 13th century CE (excepting the Khmer Rouge period), and is currently estimated to be the faith of 90% of the population. A smaller number of Cambodians, mostly of Vietnamese and Chinese descent, practice Mahayana Buddhism. The main orders of Buddhism practiced in Cambodia are Dhammayuttika Nikaya and Maha Nikaya. Islam is the religion of a majority of the Cham (also called Khmer Islam) and Malay minorities in Cambodia. According to Po Dharma, there were 150,000 to 200,000 Muslims in Cambodia as late as 1975. Persecution under the Khmer Rouge eroded their numbers,