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A floor is the walking surface of a room or vehicle. Floors vary from simple dirt in a cave to many-layered surfaces modern technology. Floors may be stone, wood, bamboo, metal, or any other material that can support the expected load. The levels of a building are often referred to as floors although a more proper term is story or storey. Floors typically consist of a subfloor for support and a floor covering used to give a good walking surface. In modern buildings the subfloor often has electrical wiring, plumbing, and other services built in. As floors must meet many needs, some essential to safety, floors are built to strict building codes in the first world. == Special floor structures == Where a special floor structure like a floating floor is laid upon another floor then both may be referred to as subfloors. Special floor structures are used for a number of purposes: * Balcony, a platform projecting from a wall * Floating floor, normally for noise or vibration reduction * Glass floor, as in glass bottomed elevators * Nightingale floor makes a noise when an intruder walks on it * Raised floor, utilities underneath can be accessed easily * Sprung floor, improves the performance and safety of athletes and dancers 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「floor」の詳細全文を読む スポンサード リンク
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