A field research study was conducted to investigate the wetting and drying characteristics in three 2 × 6 wood-framing wall specimens when they were subjected to different heat, air, and vapor flow transmission. The stud cavity of the wall specimens were filled with glass-fiber insulation having a nominal thermal resistance of R-20. The three wall specimens consisted of an exterior oriented strand board sheathing of 11-mm thick, spun-bonded olefin membrane, and vinyl siding. To investigate the effect of air/vapor barrier on the moisture performance, the first and second wall specimens, referred in this paper as “W1” and “W2,” included a 6-mil polyethylene sheet that was installed on the interior side of the stud cavity, behind a painted drywall. However, in the third wall specimen, referred as “W3,” the interior side of the stud cavity was closed by painted drywall without air/vapor barrier. To investigate the effect of the exterior insulation on the moisture performance of wood-framing walls with an air/vapor barrier, an insulation board made of extruded polystyrene (XPS) (50 mm thick and having a nominal thermal resistance of R-10) was installed in the wall specimen W2 on the exterior side of the spun-bonded olefin membrane. With and without air/vapor barrier, and with and without exterior insulation, this research study accounted for different parameters that may affect the wetting and drying characteristics in the wall specimens. These parameters included the pressure differential across the wall specimens, indoor humidity, outdoor cold climates, and air leakage as a result of creating deficiencies that provided a path for air leakage in the wall specimens. A test protocol was developed in this study that permitted investigating the effects of these parameters on the hygrothermal performance of wood-framing wall systems.

进行了一项野外研究，以研究三个2×6的木框墙样品在不同的热，空气和蒸汽流动条件下的润湿和干燥特性。壁样品的螺柱腔中填充了标称热阻为R的玻璃纤维绝缘材料-20。这三个壁标本由11毫米厚的外层定向刨花板护套，纺粘的烯烃膜和乙烯基壁板组成。为了研究空气/蒸汽屏障对湿气性能的影响，在本文中称为“ W1”和“ W2”的第一和第二个壁试样包括一个6密耳的聚乙烯片材，该片材被安装在玻璃棉片的内侧。螺柱腔，在粉刷过的石膏板后面。但是，在第三个壁样品（称为“ W3”）中，螺柱腔的内侧被没有空气/蒸汽屏障的粉刷干墙封闭。为了研究外部隔热对带有空气/蒸汽屏障的木框架墙的防潮性能的影响，采用了一种由挤塑聚苯乙烯（XPS）（厚度为50毫米，标称热阻为R）制成的隔热板。-10）安装在纺粘烯烃膜外侧的壁试样W2中。有无空气/蒸汽屏障，有无外部绝缘，这项研究考虑了可能影响壁试样湿润和干燥特性的不同参数。这些参数包括壁试样两端的压差，室内湿度，室外寒冷的气候以及由于缺陷产生的空气泄漏，这些缺陷为壁试样中的空气泄漏提供了路径。在这项研究中开发了一个测试协议，该协议允许调查这些参数对木框墙系统的湿热性能的影响。