A roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most numerous.

In most countries a roof protects primarily against rain. Depending upon the nature of the building, the roof may also protect against heat, sunlight, cold, snow and wind. Other types of structure, for example, a garden conservatory, might use roofing that protects against cold, wind and rain but admits light. A verandah may be roofed with material that protects against sunlight but admits the other elements.

The characteristics of a roof are dependent upon the purpose of the building that it covers, the available roofing materials and the local traditions of construction and wider concepts of architectural design and practice and may also be governed by local or national legislation.

The elements in the design of a roof are:

The material of a roof may range from banana leaves, wheaten straw or seagrass to lamininated glass, aluminium sheeting and precast concrete. In many parts of the world ceramic tiles have been the predominant roofing material for centuries.

Robert Joseph "Bob" Vila (b. June 20, 1946) is an American home improvement television show host known for This Old House (1979–1989), Bob Vila's Home Again (1990–2005), and Bob Vila (2005–2007).

Vila, a Cuban American native of Miami, Florida, received a Bachelor degree in entomology from the University of Florida in 1969. After graduating, he served as a volunteer in the Peace Corps, working in Panama from 1971 to 1973.

Vila was hired as the host of This Old House in 1979 after receiving the "Heritage House of 1978" award by Better Homes and Gardens, for his restoration of a Victorian Italianate house in Newton, Massachusetts. On This Old House, Vila appeared with carpenter Norm Abram as they, and others, renovated houses. In 1989 he left the show under controversial circumstances. Some cite the reason as being a series of conflicts with This Old House executive producer Russell Morash arising from his involvement with outside commercial endorsements, while others cite a specific instance- Vila's commercial work for New Jersey-based Rickel and the subsequent retaliatory pulling of underwriting from Rickel's competitor Home Depot and lumber supplier Weyerhaeuser- as the reason behind his departure. He was replaced by Steve Thomas.

Jon Peters (born John H. Peters; June 2, 1945) is an American movie producer.

Peters was born in Van Nuys, California, the son of Helen (née Pagano), a receptionist, and Jack Peters, a cook who owned a Hollywood diner. He is of Cherokee (father) and Italian (mother) descent. His mother's family owned a renowned Rodeo Drive salon in Beverly Hills. Jack Peters suffered a heart attack and died when his son was ten, and Helen's marriage to a construction worker devastated the family.

Peters went into the family hair styling business and was successful on Rodeo Drive in Hollywood where he made many industry connections. Peters first gained national prominence when he began dating superstar singer and actress Barbra Streisand after designing the short wig Barbra wore for the 1974 comedy For Pete's Sake. He then produced Streisand's 1974 Butterfly album, from which two songs, "There Won't Be Trumpets/A Quiet Thing" and "God Bless the Child", were later released on her Just For the Record box set - on the liner notes she stated that 'no one at the record company shared my enthusiasm. They thought the songs didn't belong on a contemporary album like Butterfly'. In 1976 he was given a controversial producing credit on Streisand's remake of A Star Is Born. He worked with Peter Guber for the next ten years. Their hits included The Color Purple, Flashdance, Batman, and Rain Man. He headed Sony Pictures with Guber for two years until Guber fired him. The pair were the subject of the book Hit and Run: How Jon Peters and Peter Guber Took Sony for a Ride in Hollywood by Nancy Griffin and Kim Masters.