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Asphalt roll roofing or membrane is a roofing material commonly used for buildings that feature a low sloped roof pitch in North America. The material is based on the same materials used in asphalt shingles; an organic felt or fiberglass mat, saturated with asphalt, and faced with granular stone aggregate. ==Overview== thumb Roll roofing is usually restricted to a lightweight mat compared to shingles, as it must be rolled for shipment. Rolls are typically by in size. Due to its light weight compared to shingles, roll roofing is regarded as an inexpensive, temporary material. Its wide width makes it vulnerable to temperature-induced shrinkage and tearing as it expands and contracts. Other names for this material are "asphalt prepared roofing, asphaltic felt, cold-process roofing, prepared roofing, rolled roofing, rolled strip roofing, roofing felt, sanded bituminous felt, saturated felt, self-finished roofing felt."〔 "cold-process roofing." ''McGraw-Hill Dictionary of Architecture and Construction''. 2003. The McGraw-Hill Companies, Inc. 20 Dec. 2013 http://encyclopedia2.thefreedictionary.com/cold-process+roofing 〕 Roll roofing is normally applied parallel to the eaves from the bottom of the roof upwards, lapping each new roll in the same manner as shingles. Its use is restricted to roofs with a pitch of less than 2:12. To avoid penetrating the exposed membrane with nails, adhesive or "lap cement" must be used at the bottom edge to keep it from being lifted by the wind. The upper edge of the roll is nailed and covered by the next roll. ==Uses== The main uses are: * for outbuildings * on flat roofs on houses in the UK, a low cost limited life roofing method * as a backup water catching & wind stopping layer under roofing slates & tiles 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「Asphalt roll roofing」の詳細全文を読む スポンサード リンク
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