隔汽膜和透氣膜的區別

隔汽膜和透氣膜的區別

隔汽膜是防潮的塑料薄膜，是防止在各種建筑結構（鋼結構，木屋結構，被動式建筑保溫層）中形成冷凝。在商業建筑或家庭房屋中，隔汽膜可以提高能量效率和房屋舒適度，同時還可以防止潮濕。

怎樣區分隔汽膜和防水透氣膜

隔汽膜的應用十分廣泛，它是用在建筑物保溫層的下層，起到防止室內的潮濕空氣向保溫層滲透的作用。它可以隔絕水和空氣，完全不透氣，因此使用在保溫層的最下層，可以防止室內的水汽滲透到建筑圍護結構中。而防水透氣膜一般是鋪在保溫層的上方，它是一種新的產品，在防水的同時兼具透氣的功能。它的作用是防止室外的雨水進入保溫層，同時能將保溫層的潮氣向外排出，讓保溫層保持干燥，增加建筑的保溫性能，從而使建筑更加節能。

當然，在十分潮濕的地區，也有把隔汽膜使用在建筑的外側的，這個要根據當地的安裝特點進行選擇。

 

A vapor barrier for insulation is a moisture-proof plastic film that prevents condensation in various building insulation such as steel structure, timer frame structure, passive building etc.In commercial buildings or houses, the vapor barrier on insulation improves energy efficiency and living comfort as well as preventing the moisture.

How to distinguish the vapor barrier and breathable membrane

The vapor barrier is widely used at the bottom of the insulation of buildings to prevent the penetration of indoor humid air into the insulation layer.The vapor barrier insulation can isolate water and air, and keeps the room completely airtight. So people use vapor barrier under the insulation layer in order to prevent indoor water vapor permeation into the building envelope.While breathable membrane is installed on the outside part of the insulation layer commonly, it is a kind of new product with both waterproof and breathable performance.Its function is to prevent outdoor rainwater to enter the insulation layer, and at the same time, it can discharge moisture from the insulation layer outwards to keep the insulation layer dry and increase the insulation performance of the building, thus making the building more energy saving.

But, in very wet areas, people also installed the roof vapor barrier as well as wall vapor barrier outside the building structure, this should be decided by the local installation codes.