There are various types of membrane products for insulation. Among them, vapor barrier and breathable membrane are the most commonly used ones. Then what are the differences between these two products?When should we use the breathable membrane and when should we use the vapor barrier?Today we're going to discuss about the question.

The vapor barrier is compressed by impermeable polyethylene and macromolecule shelter.The product is not only waterproof, but also does not allow water vapor to pass through. But there is no product that is completely impermeable.Usually the vapor barrier is with low water vapor transmission rate called vapor retarder. There are also retarders with different classes. PANZHU VAPOR BARRIER has two types with transmission rater of 0.27 us perm and 0.07 us perm.

Different area zone will use different standards and different vapor barriers. Usually the vapor barrier is used inside the insulation in cold areas in order to prevent the moisture from daily work from affecting the insulation. The vapor barrier is used outside the insulation in some humid areas in order to prevent the moisture outside from affecting the insulation.


Breathable membrane is a new kind of product, which is composed of two layers of shelter and one layer of breathable membrane.The breathable membrane in the middle is a high-tech product. Breathable membrane is a kind of microporous membrane with tiny pores inside. This microporous membrane can allow water vapor to pass smoothly but not water molecules.Good microporous membrane can ensure the stability performance of waterproof and air permeability.Different production processes produce membrane with different tensile strength. The latest products of the PANZHU Breathable membrane is with the thickness of 0.3mm and tensile strength of 232N/50mm. 

Waterproof membrane using method:

1. Outside the insulation: Waterproof membrane is used on the exterior of insulation to prevent the influence of strong wind and rain.Because PANZHU waterproof membrane can reach the hydrostatic pressure of 2 meters water column for an hour impermeable (the most advanced detection method in China now), wind protection effect is also very good.Waterproof membrane can increase the R value of insulation, reduce the influence of thermal bridge inside the house, and improve the comfortable level inside the house.Therefore, the most advanced passive house (zero-energy buildings) require the use of waterproof membrane.

2. Inside the insulation: the waterproof membrane is used in the interior of the insulation to prevent the indoor moisture from affecting the insulation, and promote the discharge of water vapor inside the insulation, so as to prevent the phenomenon of mold and rot inside the insulation.

 Breathable membrane

New products of PANZHU waterproofing membrane:

1. Waterproofing membrane flame-retardant: Waterproofing membrane flame-retardant is  processed by adding flame retardant into Waterproofing membrane.Waterproofing membrane flame-retardant is suitable for buildings with higher fire prevention requirements.For example, steel structure roofs where electrical welding is used. Waterproofing membrane flame-retardant can reach fire class B1,which can self-extinguish without flame.Waterproofing membrane flame-retardant enhanced the fire prevention capacity of the building. 

2. Breathing membrane Reflective: the Breathing membrane Reflective adopts vacuum aluminum plating process, and the tensile strength and adaptability to sunlight are enhanced.At the same time, the product also has the function of heat reflecting , which can effectively reduce the loss of heat or cool air inside the house, and prevent the heat outside from entering the room.

In general, whether using vapor barrier or breathable membrane, it depends on the specific local codes. PANZHU ECO FRIENDLY MATERIAL will always be with you.Our aim is to provide extra protection for your living environment!





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