Hydraulic barriers for roofing works now presented in a large assortment. And it is not easy to choose them without knowing the features and advantages of each type of materials. Today we will talk about diffusion membranes - a roll material that conducts moisture on only one side. If you put such a membrane on a surface, moisture will evaporate from it, but will not get inside due to its special structure. It is this property that makes membranes especially in demand in regions with large temperature differences.
Read in the article
- 1 How a diffusion membrane works
- 2 Varieties of diffusion membrane
- 3 How to correctly lay a diffusion membrane
- 4 Special membranes for specific tasks
How a diffusion membrane works
Depending on the manufacturer's decision, such materials can be called differently: conductive or semi-conductive, vapor barrier, diffusion membrane.
Note! The name "film" should not be - it is a completely different material.
So that the developer does not make a mistake when laying, the sides of the membrane are marked. Failure to identify the right side can lead to catastrophic damage insulation in just a couple of weeks.
The more microscopic holes in the surface of the roll material, the better the membrane wicks moisture away.
Varieties of diffusion membrane
Diffusion membranes, as already mentioned, the better they remove moisture, the more holes they have. According to this principle, the material is divided into three categories: low diffusion with a capacity of up to 300 mg per square meter, medium - from 300 to 1000 mg and high - more than 1000 mg.
A comment
Mikhail Starostin
Head of the team of the repair and construction company "Dom Premium"
“The special properties of diffusion membranes are used not only in construction. They are also in demand in agriculture as a material for greenhouses. "
How to correctly lay a diffusion membrane
The water barrier is placed between the roofing material and the thermal insulation or the roof frame, if thermal insulation is not provided. In order for the membrane to reach its full potential, it is important to position it correctly.
If the canvas is placed on the rafters, then it should be pressed with a counter lattice with small gaps for free air circulation. A free space of 1.5–5 cm is left between the membrane and the roofing material for blowing. In order for moisture to flow freely over the surface, there should be no obstacles in its path.
If you make the flooring according to all the rules, it will last at least half a century.
Special membranes for specific tasks
The diffusion membrane principle is also used to solve specific problems. For this, roll material with a special coating is made.
There are membranes with aluminum spraying. In particular, these are produced by DuPont. Their advantage is that the surface of the hydro-barrier also reflects heat, preventing the roof from heating up.
In the southern regions, a good effect is given by the use of a foil membrane, which, like metallized, reflects heat and retains the temperature well under the vapor barrier, preventing condensation.
And some more useful information about this type of hydro-barrier:
If you want a durable roof without condensation problems, a diffusion membrane is the best choice. What do you think about this? Share your opinion in the comments!
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