How to get rid of condensation on plastic windows? Advice

How to get rid of condensation on plastic windows? Advice The most accurate diagnosis can be performed using a television survey, but in general, the classification of the root causes, due to which the glasses will start to settle condensate, includes four points. The problem may arise due to one or several factors at once: Reasons for the appearance and struggle with condensation on plastic windows, Reasons for the formation of condensation, ways to deal with it. The most accurate diagnostics can be performed using a television survey, but in general, the classification of root causes,


for one or several factors at once:

  • How to get rid of condensation on plastic windows? Advice The room microclimate has changed.
  • The window structure was incorrectly selected.
  • Violation of installation technology.

  • Purchase of a defective frame or glass unit.

We suggest that you familiarize yourself in more detail with why condensation forms on plastic windows, in order to find out how to effectively deal with it.

Detailed analysis of the reasons for the formation of condensation

Violations of the indoor microclimate

So, what requirements are put forward by SanPin to the microclimate in the residential room?

Please note that the most comfortable for living is the temperature from +18 to +23 degrees, and the humidity should be from 40 to 50% and the air exchange rate from 3 m3 for each linear meter indoors, if it will serve for recreation and spending time during leisure.

But keep in mind that in the kitchen, air exchange should be 2-3 times faster (with an electric and gas stove, respectively). From the recommendations, we can conclude that a living space can be considered comfortable not only when it will be warm, but also if enough fresh air will get into it.

Ventilation device

The apartment ventilation system of the household type is carried out in the sanitary unit and the kitchen. In other rooms, fresh air can enter only during ventilation and through microscopic cracks. When winter comes, in houses where ordinary wooden frames are installed, the natural micro-ventilation is blocked, as the window panels are pasted over with paper strips. But even with such protection, windows rarely start to fog up. After the installation of plastic windows is performed, the situation changes dramatically if the design was chosen so that no one took into account the peculiarities of the regional climate or certain mistakes were made during the installation work.

So what is the essence of the phenomenon of condensation on plastic windows? There is a certain amount of moisture in the air space, and if it starts to come into contact with the surface, and the temperature of the latter is less than the "dew point", then condensation begins to form. If glass on the window acts as such a surface, then it fogs up. The degree at which condensation forms will not be constant.The dew point is for the most part tied to the "room temperature-moisture-laden air" ratio.

For example, to a room the constant temperature is kept at around +15 degrees, then condensation will begin at a temperature of +13, +7.

3 and +1. 5 degrees, if the air humidity is 90%, 60% and 40%, respectively. For this reason, it becomes clear that in damp and poorly heated rooms, the windows constantly fog up. But where does the water come from on the windows in the house? Let's look at this issue further. Condensation can occur in a variety of conditions and will depend on the factors mentioned above, as well as your own life process.

While a person is not in the house, the level of humidity will be the same, and as all households gather in one house, as well as the type of activity, the amount of water in the room will increase.

For each hour, approximately this amount of water is formed in each house:

  • How to get rid of condensation on plastic windows? Advice From breath - 40-90 grams from each person.
  • If there are growing plants in the house - up to 10 grams from a small bush.
  • When cleaning and cooking - 1 kg.
  • Bath and shower reception - up to 2.

    6 kg.

  • When washing in a machine - up to 300 grams.
  • With a medium-sized aquarium - up to 200 grams.

But how much more water is there in the building mixtures that were used during home decoration, washing wallpaper? Moisture can persist inside such objects for up to 2 years. If the air inside the apartment rarely warms up more than +17 degrees, then there are all the prerequisites for the appearance of condensation.

How to avoid such a phenomenon?

There are a number of specific and proven by more than one person methods that you need to use at least 1-2 times a day:

  • Keep the windows slightly open for a long time so that the air in the apartment dries out (an excellent option only for those apartments with good heating).
  • Open all the vents in the apartment wide open for 15 minutes (unlike moisture, you will not lose much heat).
  • Arrange a 2-minute ventilation with the opening of the front door and windows (make sure that with such a sharp change in the humidity level, all open elements of the frame structure and the door are well fixed, and not slammed).

At the same time, do not forget to check that the warm air from the radiator flows not only into the room, but also to the curtains, and the curtains, in turn, are slightly separated from the edge of the window sill.

Errors when choosing plastic windows

If you are tortured by condensate that constantly remains on the glass, and the windows are plastic, then there is an opportunity to fix the problem if you replace standard plastic structures for energy saving.

This will only help on condition that the installation work will be performed by a specialist, and not just a friend "from the street".

Problem due to technology violations during the assembly of the insulating glass unit

If you attach to the glass of plastic windows, where condensation forms, defective sealing rubber or incorrect installation certain elements of window fittings, then even the most expensive double-glazed windows will not be able to meet the owner's expectations. In certain such cases, the problem can be solved if the fittings are correctly installed.

Problems due to improper installation and design of slopes

If you are 100% sure of the window manufacturer, that is, assumptions that the cause of the "fog" may lie in poor-quality foaming of the frame or poor vapor barrier coating. Sometimes builders can completely "forget" about the last factor, because they simply do not know how to properly fit waterproofing into a window structure.

For this reason, only professionals should be allowed to install windows. Believe me, it is much more difficult to correct the mistakes that were made during the installation of plastic windows.

Other reasons

Condensation on glass can form both in a structure with a plastic panel and with a wooden one. The main causes of "fogging" are:

  • Seasonal cold.
  • There is a lot of moisture in the room.

  • Window construction has poor thermal insulation.

Since you definitely cannot cope with the cold outside, it remains either to affect the level of humidity inside the room, or to replace the double-glazed windows with more modern ones, moreover, they must be with reinforced thermal insulation (with special coated and dual chamber). Do not think that only modern windows can "sweat". Condensation can occur everywhere and the type of material that was used to create the profiles will not be the main reason. It all depends on the tightness of the selected window structure.

Even the same windows from a Finnish manufacturer with a load-bearing wooden frame and double glazing will sweat less than windows made according to European standards and having a single chamber. This is due to different thermal insulation properties - thermal energy insulation is much better in double-chamber windows. There is water vapor in the air, and as the degree rises, the amount of moisture in the air begins to rise. If you bring something really cold into a room that is saturated with moisture, then an invisible "casing" of cold air will immediately appear around. Such a temporary envelope is not able to retain a lot of moisture, as is the case with the rest of the air in the room, so the surface of the introduced object will very quickly become wet due to the very "dew".

The more water in the atmosphere, the less "demanding" moisture will be to the temperature level of objects, on the surface of which it will fall out as condensation. It turns out that they no longer need to have the same temperature as vegetables from the refrigerator or a bottle of drink.If the saturation in the air is approximately 100%, then the vapor will begin to settle on all objects whose temperature will differ by 1 degree or even less from the temperature of the atmosphere.

When the inner glass in a double-glazed chamber has the same temperature at which the dew point begins to form or even lower, then the humidity inside the structure will also correspond to a certain parameter, and condensation will be even greater on the plastic window. For this reason, "tears" on the glass are direct evidence that there is a high level of humidity inside the house.

There are the following possible reasons:

  • Result of daily activities throughout the apartment.
  • Disrupted ventilation process.
  • Double-glazed window with damage or defects.
  • Violation of the technology for installing a glass structure in the frame opening.

If the essence of the problem is that the air is poorly conditioned, then the appearance of condensation can be perceived as a call to ventilate the room once again.

But if, even after airing, the glass begins to cloud again, and frequent opening of windows will lead to the fact that you will get an overconsumption of heat, then it makes sense to start stabilizing the ventilation system, and even find a replacement for the already installed glass unit.

Important! Try to select a new design for the typical temperature fluctuations in your area.

If in your area a temperature of -20 degrees in winter is quite normal, then a glass unit should be taken taking into account the parameters of the appearance of the dew point and a comfortable level of humidity and air heat for you and your seven inside the room. If the normal air humidity for you is 60%, and the air temperature is about +20 degrees, then in such conditions the dew point will be +12 degrees. At a similar temperature and humidity of 40%, the dew point will be +6 degrees.

How to use this knowledge in practice?

While studying the range of double-glazed windows, you should pay attention to the indicator, the measure of which is C / W. With the initial data described above (outside -20 degrees, in the house +20 degrees and humidity 40%), the thermal insulation index of the window structure, i.e. Rо should be greater than 0. 35 m2оС / W.

With an increase in humidity, for example, up to 55%, the new value will be 0.54 m2оС / W. What else do you need to know when selecting a new double-glazed unit?

Please note that if the supporting structure is with a distance-type frame made of aluminum, then cold bridges will appear at the edges of metal products.

Because of this, when cold snaps begin, there is a possibility of condensation on the glass near the line of contact between transparent elements and aluminum profiles.

We suggest considering additional measures to reduce the likelihood of condensation on the glass of PVC windows:

  • Find out if near all (or not) windows the heated air from the radiator gets to glasses (the edge protruding from the window sill and closely spaced curtains can interfere with the process).

  • Install a ventilation valve that allows a portion of fresh air to flow to the glass surface, which will also help in the fight against condensation.

Now let's look at how to deal with this.

How to deal with fogging

In order not to have to deal with condensation on the glass of plastic windows again, it is better to orient yourself with the selection of a good and reliable design. Determine the ideal dew point level for you, and then tell the received data to the manager who will serve you, and say that you want to purchase windows with an indicator higher than the parameter that you calculated.

To be on the safe side and your request was not simply ignored, ask to add this parameter to the contract, and make sure that everything is really that way.

If sellers will be unlocking, then perhaps it is worth changing the company? Why would you buy a double-glazed unit, the characteristics of the technical type of which will be similar to the windows that are in your house and do not suit the quality? instructions, you can rejoice, but after the first cold snaps, not earlier. Sometimes it happens that at the very first cold, small clouds of condensation appear - what to do in this case? Change again? No. Small specks are quite natural and not problematic, unlike what we will talk about next.

This is something that can happen secretly from your eyes:

  • Window openings, which are masked by decorative slopes, have bridges of cold, and because of them, under the panels gradually begin to accumulate moisture, and this can provoke the appearance and further growth of mold, as well as the loss of the technical quality of the insulating pad.
  • Slopes prevent hot air from reaching the glass surface (tips that describe how to prevent moisture from forming on windows will help here).

  • Soviet old windows were remembered by many for having many slots, from which it blows strongly in the cold season - but at the same time, such micro-holes participated in the process of natural ventilation of the apartment. At the moment, all this is disappearing faster and faster due to the installation of metal-plastic windows (the problem is quite significant, it urgently requires the creation of a new and efficiently working ventilation scheme inside the dwelling).

Consider a few more possible problems and ways to deal with them.

First, the windows sweat, and then they are taken with a crust of ice

It is extremely rare that those who installed metal-plastic windows did not encounter the formation of condensation on the glass. Such a nuisance can happen for various reasons, and even professionals cannot always say for sure what caused such a problem.

To identify the reasons, you will need some knowledge of physics and practice, experience. But eliminating the reasons why windows "cry" will make it possible to forget for a long time what foggy windows are.

Explanation from the point of view of physics

When the window starts to fog up, you see the real, actual result of getting atmospheric moisture in the form of vapor into liquid due to exposure to low temperatures. The fact is that cold air cannot hold a lot of water, so the excess of the latter settles on everything that has a temperature lower than that of air.

If the window is the coldest area in your apartment, then moisture from the cooled air will settle on it.

With a large amount of condensate obtained, it can become a real problem, since not only will the building structures begin to get very humid, you may have mold in your house! And if there are severe frosts outside the windows, then "icebergs" may appear on the window, and this is only due to the high humidity of the air. But keep in mind that with excessive dryness, problems can also arise, but already with health. How can he get rid of the condensation, but at the same time not harm either loved ones or himself? The grandfather's method would be ideal - to do airing more often.

Why is there no condensation in apartments with old windows?

Current double-glazed windows are sealed and do not allow air flow to get inside. Because of this, the natural ventilation of the apartment completely disappeared, which, by the way, was taken into account during the design of the building.

The air masses, although they got into the apartments little by little, dried the air in the room, which prevented condensation from forming on the windows. When replacing ordinary frames with modern ones (it is not necessary that they be made of a metal profile), but with sealed porches, natural ventilation is stopped, and excess moisture in the apartment began to settle on the glass.

To achieve normal humidity, ventilate the room or install windows that have a delicate ventilation system, and then air microcirculation will be restored, and the windows will no longer "cry".

Additional factors that can influence fogging

Interestingly, very often wide window sills, which interfere with warm air flows from the radiator, are "to blame" for the formation of condensation get to the vertically located surface of the window opening. The presence of flowerpots can also aggravate the situation.

If you do not have the ability to create normal convection, then get ready to constantly run with a rag for wiping and open the window as often as possible.

If, in addition to complete tightness, natural ventilation does not occur, and the hood is broken or not at all, then you will face fogging all year round. For this reason, the cooker hood above the stove is not a whim, but a useful household item that is able to maintain a normal level of humidity inside the house. Do not forget to purchase this device when you start repairing - the main thing is not to turn it on with the newly pasted wallpaper. And finally, the consequences are even sadder when the owners incorrectly performed the reconstruction or even completely removed the ventilation system.

In this case, freezing and condensation will not be long in coming.