What is the popular science gas barrier of PVC film?

The PVC membrane science air barrier is a structural layer designed to reduce the ventilation of the ground, walls or roof in buildings. It is a relatively new building product, first (in the mid-1980s) in Canada as a means of building energy efficiency.

When water vapor enters the insulation layer through the structural layer, the moisture content of the insulation layer will increase, and the thermal conductivity will also increase, resulting in a decrease in the insulation capacity of the insulation layer. And because the waterproof layer above the insulation layer is not breathable, the moisture in the insulation layer cannot diffuse away.At this time, the insulation layer will gradually lose its insulation effect as the moisture increases, resulting in flexible waterproof bulges and cracks, making the waterproof layer Loss of water resistance. The key to solving this problem is to set up a gas barrier layer under the insulation layer and on the leveling layer to block the water vapor from the room below.