描述了1990年10月至1992年4月之间进行的一项研究，其中在加利福尼亚州佩塔卢马的一栋共管公寓大楼中，对四个爬行空间内的条件进行了监测。在本研究所选建筑的两端和两个室内单元的爬行空间内，定期监测木材水分含量和环境条件。使用电阻式湿度计测定每个监测爬行空间中梁的含水量，并通过定期称量托梁上悬挂的小木块，在整个研究过程中估计平衡条件。 使用风扇式干湿计、湿度计或与数据采集系统相连的温度/相对湿度探头监测环境条件。本研究的目的是确定在该建筑中选定单元的爬行空间安装地被膜前后，现场情况下木材含水量和环境条件的变化。安装时，在一个内部和一个端部装置上使用了地面覆盖膜。研究发现，地被膜可以降低爬行空间的湿度水平，并使之前潮湿和腐烂的木质构件干燥。 关键词:爬行空间、比较、木材、水分、美国、监测、建筑、内容物、横梁、现场测试、防潮层、防潮层、薄膜、湿度、干湿表、湿度计、探头。引用:研讨会，ASHRAE Trans。1994年，第100卷，第一部分

Describes a study conducted between October 1990 and April 1992 in which the conditions within four crawl spaces were monitored in a six-unit building in a condominium complex in Petaluma, California. Wood moisture contents and ambient conditions were periodically monitored in the crawl spaces of two end and two interior units in the building chosen for this study. The moisture content of the beams in each monitored crawl space was determined using a resistance-type moisture meter, and equilibrium conditions were estimated throughout the study by periodically weighing small wood sections that were suspended from the joists. Ambient conditions were monitored using a fan-aspirated psychrometer, a hygrothermograph, or temperature/relative humidity probes linked to a data acquisition system. The objective of this study was to determine the change in wood moisture content and ambient conditions in a field situation before and after a ground-cover membrane was installed in the crawl spaces of selected units in this building. When installed, the ground-cover membrane was used on one interior and one end unit. The ground-cover membrane was found to reduce humidity levels in the crawl space and allowed previously wet and decayed wood members to dry out.KEYWORDS: crawl spaces, comparing, wood, moisture, USA, monitoring, buildings, content, beams, site testing, moisture barriers, vapour barriers, membranes, humidity, psychrometers, hygrometers, probes.