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Superinsulation is an approach to building design, construction, and retrofitting that dramatically reduces heat loss (and gain) by using much higher levels of insulation and airtightness than normal. Superinsulation is one of the ancestors of the passive house approach. ==Definition== There is no set definition of superinsulation, but superinsulated buildings typically include: * Very high levels of insulation (typically Rip40 walls and Rip60 roof, corresponding to SI U-values of 0.15 and 0.1 W/(m²·K) respectively) * Details to ensure insulation continuity where walls meet roofs, foundations, and other walls * Airtight construction, especially around doors and windows * a heat recovery ventilation system to provide fresh air * No large windows facing any particular direction * Much smaller than conventional heating system, sometimes just a small backup heater Nisson & Dutt (1985) suggest that a house might be described as "superinsulated" if the cost of space heating is lower than the cost of water heating.〔Nisson, J. D. Ned; and Gautam Dutt, ''The Superinsulated Home Book'', John Wiley & Sons, 1985 ISBN 0-471-88734-X, ISBN 0-471-81343-5〕 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「superinsulation」の詳細全文を読む スポンサード リンク
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