专利申请号:CN201080007426.X,公开号:CN102317072A,申请日:2010.01.29,公开日:2012.01.11,申请人:日本福美化学工业有限公司、蝶理株式会社、住江织物株式会社。本发明提供轻质且即使经过严酷环境条件也能维持优良的钉孔密封性的可以充分地防水且透湿性也优良的建材用透湿防水片材。该透湿防水片材的特征为:具有体积密度0.01 g/cm3以上的无纺布层;在无纺布层的上 Patent application number: CN201080007426.X, Publication number: CN102317072A, Date of application: 2010.01.29, Date of publication: 2012.01.11, Applicant: Fumei Chemical Industry Co., Ltd. of Japan, Dori Co., Ltd., Sumio Textile Co., Ltd. The present invention provides a moisture-permeable and water-permeable waterproof sheet for a building material that is light-weight and can maintain excellent nail hole sealing even under severe environmental conditions and can be sufficiently waterproof and excellent in moisture permeability. The moisture-permeable waterproof sheet is characterized by having a nonwoven fabric layer having a bulk density of 0.01 g / cm3 or more,