Waterproof breathable film and vapor barrier film are used together

Waterproof breathable film and vapor barrier film are used together

Waterproof breathable film:

Waterproof breathable membrane: the definition of the "building palisade structure heat transfer calculation and design theory in the book, put forward the" only at the side of the high temperature (the inside palisade structure) dealing with a steam insulation layer are only part of the solution (moisture), must be in the low temperature side handle a quote from thermal insulation layer (insulation) wet out of the air layer, in order to ensure that the thermal insulation layer (insulation layer) and maximum dry ", at the same time, the thermal insulation layer of the lateral "wind paper must do, eliminate the air in the thermal insulation layer (insulation layer) of the internal penetration, with permeable water vapor, but not it is advisable to large-scale air paper". This series of statements are completely consistent with the theory of waterproof vapor permeable film. In the practice of the theory, the ideal results are obtained. At present, the engineering specifications are in GB50693 "slope roof engineering technical specifications", GB50896 "pressed metal plate technical specifications", JGJ/T235 "building external wall waterproof engineering technical specifications". In 2014, JC/ t2291-2014 waterproof gasket standard was issued.

Production process: domestic waterproof breathable film is the top and bottom two layers are high grade polypropylene material, waterproof breathable film middle layer is polypropylene polymer breathable film.


Vapour membrane

1. Steam insulation film is a kind of material used to enhance the air tightness and water tightness of buildings, slow down the discharge rate of water vapor and indoor wet vapor in the concrete structure to the insulation layer, prevent condensation from forming, protect the thermal performance of insulation materials and maintain the structure, and reduce the building energy consumption.

The insulation film is laid on the base layer to strengthen the watertightness of the building and prevent the indoor moisture from penetrating into the insulation layer to protect the insulation layer from erosion. When used together with the waterproof and breathable membrane above the insulation layer, the wall or roof can obtain excellent water vapor isolation effect, and the water vapor in the enclosure can be discharged smoothly through the waterproof and breathable membrane.

Kangda steam insulation film has excellent air insulation, waterproof, steam insulation effect, effectively prevent the invasion of moist air and condensed water into the insulation layer, effectively ensure the thermal performance of the insulation material, so that the building energy saving more effective, more lasting.

Production process: domestic diaphragm is a two-layer structure, but also has a multi-layer structure, according to different technical parameters requirements, the production process is not the same. Is the polypropylene material plus polyvinyl material through composite production.

The water vapor transmission capacity of waterproof breathable film is greater than or equal to 300-1000g/m2/24H

The water vapor transmission rate of the vapor separation film is less than or equal to 15g/m2/24H


The waterproof breathable film and vapor barrier film can be used together to avoid the decrease of thermal resistance and condensation after the moisture content of building envelope increases.