What happens if you put the vapor barrier on the wrong side

On the Internet, frightened questions are often encountered such as: They put a vapor barrier film, but mixed up the sides. What to do? Is it necessary to disassemble the entire insulation "cake" and redo it again?

Of course it is better to do according to the instructions, and not to save on trifles. But is it so scary if everything was done efficiently, but they messed up the sides? The answer is unequivocal, if everything is done using technology and high quality, then there is no need to redo it. There is nothing terrible. Just forget it. Let's figure it out in order.

Application of vapor barrier film

In simple words, the film is produced in a simple scenario. A polymer strip is taken, fibrous material is placed on it and soldered into the film. The strip is obtained with different sides, one smooth, the other not.

It is used to prevent the passage of moist air to the insulation. Simply put, you need to isolate the steam from access to the insulation, otherwise it will get wet, mold, fungus may appear in it.

The film should be installed on the border of the meeting of warm air with cold. The border runs between the decoration of the inner wall, ceiling, in conjunction with a heater. Other types of insulation are not exhaust steam.

Condensation on vapor barrier film

Finally approached the analysis of the main issue. If you plunge into the theory, then condensate can form on the film. Then, the question is; where does the condensate come from? We are considering the option when everything is done correctly, efficiently and strictly according to the technology of construction of our country, with the exception of laying the pore insulation film on the wrong side.

He just has nowhere to come from. In this case, the walls should not be so cold that there is a possibility of its formation. If condensate is taken from somewhere, then the walls were insulated poorly. Urgent need to warm the walls. It is simply impossible and unsafe to live in such a room. The risk of colds is too high, especially if small children are at home.

It turns out there is no difference which side the vapor barrier film is laid on, because there is no condensate, subject to the correct approach. If condensation appears, then name at least one reason why it will not roll down and dry when it is smooth.

Conclusion: Do not worry about the installation of the exhaust film pairs. There is no significant difference. Two different sides of the film, marketing companies producing goods.