Application of waterproof vents in metal roofs and walls

When heating in the north, the indoor relative temperature and humidity are high, the water vapor partial pressure is large, the water vapor penetrates from the inside to the outside, and the outdoor temperature is low. dew. In areas with hot summer and cold winter, the temperature is high in summer and the air humidity is high. When the indoor air conditioner is refrigerating in summer, due to the high temperature and high humidity outside, when the actual water vapor partial pressure somewhere on the wall is higher than the saturated water vapor partial pressure, condensation will occur. 

According to the principle that water vapor is difficult to enter and easy to exit, we use vapor-permeable waterproof cushion (waterproof vapor-permeable film) and impermeable heat-insulating reflective foil to form a vapor-permeable thermal insulation system to improve the thermal performance of the building envelope. While saving energy, the building structure is no longer dew condensation, away from air conditioning and mold.