Introduction to Kedebang waterproof and vapor permeable membrane
Kedebang waterproof and vapor permeable membrane is made of high-performance composite materials by hot melting. The product has good waterproof, air permeability and aging resistance. The product has unique breathing function, which can allow water vapor to pass freely, but cannot penetrate after condensation, so as to ensure the dryness and comfort of the building, and avoid the damage of the building's maintenance structure (roof and wall )。
Waterproof and vapor permeable membrane is a layer of membrane laid outside the building insulation layer, and the waterproof and vapor permeable membrane technology is to save energy consumption, protect the living environment, improve the durability and comfort of the building by strengthening the air tightness and water tightness of the building, which can more effectively ensure the dryness of the maintenance structure (exterior wall and roof) and play a significant role.
one Strengthen the air tightness and water tightness of buildings
Practice has proved that no matter what facade form or roof laying form is used, the airtightness of the enclosure structure cannot be guaranteed. As for the exterior wall, it is difficult to avoid the cracking of the plastering, the lap joint of the hanging plate is difficult to be tight, and the simple masonry block can not achieve the "impermeable wall". These problems can be found at the internal and external corners, joints and doors and windows It is more obvious around. Through these non closed pores, air flow and water vapor can invade the enclosure structure, which has a serious impact on the energy consumption, durability and comfort of the building.
two Building energy consumption
Rainwater and moisture entering the envelope with airflow will reduce the effective thermal resistance of the insulation layer, resulting in more energy consumption. Of course, the influence of water vapor on different insulation materials is different.
The intruded airflow will form convection circulation inside the building envelope, and will also reduce the effective thermal resistance of the insulation layer, resulting in more energy consumption. Similarly, the influence of air flow on different insulation materials is different.
When air flows into the room, people will have to use larger HVAC equipment to compensate for the heat/energy loss, thus increasing building energy consumption.
three Building durability
The water vapor intruding into the interior of the enclosure structure will lead to the formation of water vapor condensation (so-called condensation water) in the wall cavity, accelerating the aging of building materials, such as steel corrosion and wood decay, which will have a serious impact on the durability of the building.
four Building comfort
The invasion of air flow will adversely affect the indoor thermal comfort; Bring pollutants deposited on different building components and radiation from building materials or outdoor, thus affecting indoor air quality; The water vapor entering the building envelope creates conditions for the condensation of water vapor in the envelope, leading to the formation of mold, which affects the indoor air quality and the health of residents.
It can be seen that strengthening the air tightness and water tightness of buildings is crucial to building energy conservation and environmental protection.
five Building vapor permeability
Due to the temperature difference between indoor and outdoor, it is difficult to avoid the condensation inside the building envelope. However, in fact, only when the enclosure structure is always in a wet state will it cause moisture problems, resulting in adverse effects on building energy consumption, durability and comfort. Therefore, in order to avoid the occurrence of problems, ensure the vapor permeability of the building, so that it can achieve natural drying by diffusing water vapor to the outside, it is particularly important.
