The vapor-permeable membrane is a film that excludes the ingress of water, but perfectly passes steam into one the other side.
IMPORTANT! There is no universal membrane! There is a vapor-permeable membrane and a vapor barrier of completely different concepts with completely different purposes. Incorrect use of these films leads to the destruction of the structure!
After the final stage of construction, when it's time to warm up the roof and walls, use special films. They are placed under a layer of insulation material.
For internal work, the obstacles to evaporation must be taken into account, which excludes the presence of pores and perforations. It is preferable to use a polyethylene reinforced film. It is good if the coating is made of foil with an aluminum base.
This vapor-permeable membrane prevents condensation. And it becomes irreplaceable when working with galvanized materials, corrugated board, etc.
Such membranes have different levels of vapor permeability. This is a daily indicator of the permeability of moisture in the form of steam through a square meter of film. If this indicator is equal to several grams, we consider this sample to be vapor barrier.
If the indicator is from 100 to 1000 grams, this is a vapor-permeable membrane and it has several functions:
Consists of breathable membranes that allow steam to pass outside and prevent moisture from penetrating inside. This technology is used in the manufacture of clothing and footwear.
Regardless of the type chosen, it is important to properly lay the vapor-permeable membrane.
In case of thermal insulation, the film is laid to remove steam from the outside, and for roofing insulation on top of insulation wool. In the case of roofing work without insulation, the film should be laid at the bottom of the rafters.
When working with ceiling ceilings of rooms, the membrane should be located under a layer of insulation.
Often when working with a vapor-permeable membrane, the question arises how to distinguish the wrong side from the front? Everything is very simple. Most often, the manufacturer himself indicates the procedure and technology of work.If there are no special instructions, then one should be guided by color, as a rule, the outer side has a much bright coating.
A large assortment of building materials complicates the choice.
It is preferable to choose trusted, high-quality manufacturers - Tyvek, Tekton, Corotop. , Delta, etc.
Among domestic brands, the Izospan A model is especially popular. It is used as a protective agent for walls and roofs. The membrane will be on the outside.
This vapor-permeable membrane is characterized by excellent strength, environmental friendliness and safety characteristics. The main differences are the absence of harmful components, resistance to various bacterial and chemical infections.
Installation is carried out in the following sequence:
The work is carried out in the following sequence: rough stage, waterproofing, insulation layer, vapor barrier and finishing layer. If all the steps are followed consistently, there will be no moisture retention either inside or outside, which guarantees clean indoor air and a long service life of the floor. The most practical option is considered to be the universal Izospan V. It will protect against moisture, mold and mildew.
Building a house is not an easy task, you need to study all the subtleties and features of building codes and technologies.
Construction design should be done by professionals.
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