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An attic or a loft is a space found directly below the pitched roof of a house or other building (also called ''garret'' or ''sky parlor''). As attics fill the space between the ceiling of the top floor of a building and the slanted roof, they are known for being awkwardly shaped spaces with exposed rafters and difficult-to-reach corners. While some attics are converted into bedrooms or home offices, complete with windows and staircases, most attics remain difficult to access (usually by a loft hatch and ladder), and are generally used for storage. It is a word ultimately derived from the Attica region around Athens, Greece (via Attic style architecture). Attics can also help control temperature in a house by providing a large mass of slowly moving air. Hot air rising from lower floors of a building often gets retained in the attic, further compounding their reputation as inhospitable environments. However, in recent years many attics have been insulated to help decrease heating costs since on average, uninsulated attics account for 15% of the total energy loss in an average house.〔(Attic Insulation ) ''retrieved December 14th, 2009''〕 ==Ventilation== Modern building codes require unoccupied attics to be ventilated to reduce the accumulation of heat and moisture that contribute to mold growth and decay of wood rafters and ceiling joists.〔International Building Code, 2003 Edition, Section "1203.2 Attic spaces", Published by the International Code Council〕 One common code requirement is that the total area of attic vents be equal to or greater than 1/150 of the floor area of the attic, with 50% or more of the vent area located in the upper portion of the attic. Various types of turbine ventilators and exhaust fans can also be used to assist with attic ventilation and decrease the required area of passive ventilators. 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「attic」の詳細全文を読む スポンサード リンク
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