Year1
- 厚度：
- 0.25mm
- 不透水性：
- 3000
- 水蒸汽透过量：
- 2400
Jiakun-Waterproof Breathable Membrane
It is produced by an intermediate layer of polyethylene microporous breathable film and two layers of polypropylene polymer materials through advanced thermal composite technology. The product is laid on the insulation layer of the exterior wall (roof) of the building. It not only strengthens the water tightness of the building, but also uses its unique breathable function to smoothly discharge the moisture inside the enclosure, thereby effectively maintaining the service life of the building and playing a role. It has the functions of thermal insulation, energy saving and improving living environment.
Waterproof and Breathable Membrane Structure
Jiakun - Waterproof and Breathable Membrane is composed of polymer polypropylene material + polyethylene microporous membrane + polymer polypropylene material through thermal compounding or laminating.
The polyolefin microporous breathable membrane has excellent breathability, and the product is durable and has a long service life. The polyethylene microporous membrane is not only resistant to corrosion and acid and alkali, but also has excellent elongation properties. It can rebound quickly after being pierced by a nail to increase the sealing performance.
Shanghai Jiakun waterproof breathable membrane parameters:
Parameter performance
Product specifications
Water vapor transmission rate (/ ㎡.)
Water impermeability
Breaking strength
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Elongation at break ()
Tear properties
Low temperature flexibility (℃)
Resistance (months)
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1. Working principle of building waterproof and breathable membrane
In the state of water vapor, water particles are very small. According to the principle of capillary movement, it can Smoothly penetrates into the capillary tube to the other side, thereby causing vapor permeability. When water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (the water molecules pull and compete with each other), the water molecules cannot smoothly break away from the water droplets and penetrate to the other side, which prevents the water from Penetration occurs, making the breathable membrane waterproof.
2. The significance of water vapor permeability in building waterproof and breathable membranes
The condensation of water vapor in building exterior walls and roofs will seriously affect the performance of building insulation materials and the durability of the building envelope, leading to the growth of mold. The main cause of dampness is liquid water and gaseous water that penetrate into the interior of the building envelope with the help of external air. Some early buildings used waterproof membranes, which were laid outside the insulation layer as a building cladding system to enhance the air-tightness and water-tightness of the building. However, this waterproof membrane is not breathable, and the moisture in the building envelope still cannot be dissipated and cannot be completely solved. Moisture issues. Later, breathable waterproof membranes were used as building cladding systems (hereinafter referred to as waterproof breathable membranes), which prevented liquid and gaseous water from penetrating outside the building and at the same time allowed the water vapor in the insulation layer to be quickly discharged. The combined use of the vapor barrier layer and the waterproof and breathable membrane enhances the air tightness and water tightness of the building, solves the problem of moisture and mold resistance, and effectively protects the thermal performance of the envelope structure, thereby truly achieving the purpose of saving energy consumption.
Main features of waterproof breathable membrane:
Structural stability: This is achieved by the direct solidification and bonding of the mesh structure on the surface of the membrane and the cement structure.
Water impermeability: This is achieved by relying on the rolled polyethylene core layer and the stable bonded interface structure that is transversely impermeable.
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Resistance to atmospheric aging: This is achieved by relying on the good antioxidant and ozone resistance of polyethylene and polypropylene, as well as the cement structure that is stably combined with the membrane and completely blocks ultraviolet light.
Mechanical protection: It relies on the surface reinforcement layer and the cement material protective layer with stable performance.
Ultraviolet light protection: It is borne by the protective layer of cement material. The rolled material after construction completely blocks ultraviolet light.
Construction feasibility: It is achieved by relying on the direct solidification and bonding of the network void structure provided by the surface reinforcement layer of the coil and the cement material. In the waterproofing system, the waterproofing membrane is bonded to the main structure of the building and bonded to the protective layer using cement materials. Therefore, the structural stability is good and will not weaken over time. At the same time, the construction does not require low moisture content of the main body of the building.
Environmental protection feasibility: The product is non-toxic and non-polluting, and does not pollute the environment during the construction process.
Seepage blockage when the waterproof layer is accidentally damaged: Jiakun waterproof breathable membrane focuses on the overall waterproofing performance of the structure, rather than emphasizing the individual ability of the waterproofing membrane material to prevent water penetration. In the entire waterproofing system, the layer-by-layer structure plays a blocking role in water leakage. When the main material of the coil is accidentally damaged, the total seepage flow at the leakage point of the main material of the coil is controlled so that no open water flow is formed, thereby achieving engineering waterproofing. the overall effect.
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