The objective of this study was to test whether compliance with the current Danish best practice recommendations concerning design of the cold attic space will prevent damaging moisture levels. The project was performed as a full-scale experimental setup in the cool temperate climate of Denmark. The setup comprised 18 north-facing attic spaces with varying ventilation principles and varying infiltration scenarios. The relative humidity and temperature were measured in attic spaces, indoor and outdoor, for almost 3 years. The hygrothermal performance of the attics was evaluated by post-processing and comparing the data with predicted mould growth risk and with visual observations of mould growth. The results showed that following the recommended passive ventilation strategies made the hygrothermal performance in attics with diffusion-open roofing underlay worse. In addition, increasing vapour diffusion tightness of the roofing underlay made the hygrothermal performance of the cold attic spaces under the eaves worse, except for attics with passive ventilation but without infiltration. The hygrothermal performance of the attics with diffusion-tight roofing underlay was poor when combining infiltration and the assessed ventilation strategy. The performance of the same attic without infiltration showed that some degree of ventilation was needed. External roof insulation did not significantly improve the hygrothermal performance of the attic.

中文翻译：

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屋檐下朝北、寒冷的阁楼空间的湿热评估，具有不同的结构屋顶场景

这项研究的目的是测试符合丹麦目前关于冷阁楼空间设计的最佳实践建议是否会防止破坏性的湿度水平。该项目是在丹麦凉爽的温带气候中作为全尺寸实验装置进行的。该设置包括 18 个朝北的阁楼空间，具有不同的通风原理和不同的渗透场景。在室内和室外的阁楼空间中测量了近 3 年的相对湿度和温度。通过后处理并将数据与预测的霉菌生长风险和霉菌生长的视觉观察进行比较，评估阁楼的湿热性能。结果表明，遵循推荐的被动通风策略会使带有扩散开放式屋顶衬垫的阁楼的湿热性能变差。此外，屋面垫层水汽扩散密性的增加使得屋檐下寒冷的阁楼空间的湿热性能变差，除了被动通风但没有渗透的阁楼。当渗透和评估的通风策略相结合时，带有防扩散屋顶衬垫的阁楼的湿热性能很差。没有渗透的同一阁楼的性能表明需要一定程度的通风。外部屋顶保温材料并没有显着改善阁楼的湿热性能。除了有被动通风但没有渗透的阁楼外，屋面衬垫的蒸汽扩散密封性的增加使屋檐下寒冷的阁楼空间的湿热性能变差。当渗透和评估的通风策略相结合时，带有防扩散屋顶衬垫的阁楼的湿热性能很差。没有渗透的同一阁楼的性能表明需要一定程度的通风。外部屋顶保温材料并没有显着改善阁楼的湿热性能。除了有被动通风但没有渗透的阁楼外，屋面衬垫的蒸汽扩散密封性的增加使屋檐下寒冷的阁楼空间的湿热性能变差。当渗透和评估的通风策略相结合时，带有防扩散屋顶衬垫的阁楼的湿热性能很差。没有渗透的同一阁楼的性能表明需要一定程度的通风。外部屋顶保温材料并没有显着改善阁楼的湿热性能。当渗透和评估的通风策略相结合时，带有防扩散屋顶衬垫的阁楼的湿热性能很差。没有渗透的同一阁楼的性能表明需要一定程度的通风。外部屋顶保温材料并没有显着改善阁楼的湿热性能。当渗透和评估的通风策略相结合时，带有防扩散屋顶衬垫的阁楼的湿热性能很差。没有渗透的同一阁楼的性能表明需要一定程度的通风。外部屋顶保温材料并没有显着改善阁楼的湿热性能。