英国标准5250的这次修订正值气候变化使建筑物处于危险之中 由于两个互补的原因，水分增加了压力: •直接原因是暴雨增多，洪水更频繁、更深、持续时间更长，以及大气湿度增加间接地，通过与节能措施相关的风险，包括减少通风（除非小心管理，否则会增加内部湿度水平）和额外的隔热（这会使织物外层在冬季更冷）。传统建筑的节能改造也可能扰乱其与环境气候的既定平衡，并导致结构中出现水分问题。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This revision of BS 5250 comes at a time when climate change is putting buildings under increasing stress from moisture for two complementary reasons: • Directly, owing to increased driving rain, more frequent, deeper and longer lasting flooding, and increased atmospheric humidities.• Indirectly, through risks associated with energy conservation measures, including reduced ventilation (which, unless carefully managed, will increase internal humidity levels), and extra thermal insulation (which will make the outer layers of the fabric colder in winter). Energy saving retrofits of traditional buildings may also disturb their established equilibria with the ambient climate, and allow moisture problems to develop in the structure.All current amendments available at time of purchase are included with the purchase of this document.