当允许空气流经建筑物隔热系统（即隔热层、蒸汽缓凝剂、粘合剂、夹子等）时，产生的R值为零。流经绝缘层的空气通常携带水分，导致冷凝、发霉、腐烂和腐蚀。出现这些情况的原因是蒸汽缓速器/绝缘系统设计错误和/或安装不当。在本文中，作者回顾了40年来关于绝缘/湿度问题的咨询。保温系统需要仔细设计和安装，以提高热效率。 单位:双引证:研讨会，ASHRAE交易，1998年，第104卷，第2部分，多伦多

When air is allowed to flow through a building insulation system (i.e., insulation, vapor retarder, adhesive, clips, etc.) the resulting R-value is zero. The air flowing through the insulation usually carries moisture with it, resulting in condensation, mildew, rot, and corrosion. These conditions occur due to a faulty vapor retarder/insulation system design and/or inadequate installation.In this paper, the author reviews 40 years of consulting on insulation/moisture problems. Insulation systems need to be carefully designed and installed for thermal efficiency.Units: Dual