There is an opinion that if plastic windows sweat, then this is necessarily due to their improper installation. In fact, this is just one of the possible reasons why condensation occurs on the windows.

Condensate location

If condensation appears inside the room, the problem must be solved in a timely manner so that mold and mildew does not appear

The most important thing is to determine the location of the condensation. If it appears inside a double-glazed window, then it refers exclusively to a manufacturing defect. In this case, you should call the company that was engaged in the production and installation of windows and ask to replace the glass unit under warranty. As a rule, a guarantee for the tightness of a glass unit is given for a period of five years.

But if condensation appears on the glass surface inside the room, then window manufacturers cannot help in this situation. The problem of condensation on double-glazed windows inside the premises should be given timely attention so that serious problems such as wetting slopes and walls, and the appearance of mold do not develop.

To get rid of condensation on windows, you need to understand the reasons due to which it occurs. By the way, a small amount of condensate is permissible by international standards.

Why do plastic windows sweat from the inside?

The process of fogging glass is associated with the transition of water from a gaseous state to a liquid state. The warm air in the room contains water in the form of steam. The warmer the air in the room, the more moisture it contains. The source of such moisture can be both people themselves, pets, and plants, pots with liquids, washing, cleaning, and cooking processes.

When the humid air cools, the steam turns into water droplets. Physics has a name for this process - condensation. Condensation fogging will occur when the room air comes into contact with glass, the temperature of which will be below the dew point. The dew point is the temperature at which vapor is converted from air to liquid. Glass always has the most low temperature, for this very reason, fogging occurs on the surface of plastic windows.

What to do if plastic windows sweat or how to remove condensation

There is different ways that will help reduce the amount of condensation that collects on the windows of your living space. The most common ones are a decrease in air humidity, as well as an increase in the temperature of the glass itself.

Increased air humidity occurs in the event of improper organization of the air supply fresh air into the room and the absence of a properly working exhaust ventilation. the main task ventilation is the removal of air saturated with vapors from the room.

Providing natural ventilation of the room

To provide natural ventilation it is necessary to ventilate the room 4-5 times a day

If modern plastic windows are installed in the apartment, then the tightness of such double-glazed windows is 100%. Therefore, the air exchange in the room, habitual for years, changes dramatically. Now the owner must take care of the flow of fresh air into the apartment himself: ventilate the room, use the window ventilation mode. It is recommended to ventilate the room up to four times a day for five minutes with the sash open.

Serviceable ventilation system: extractor hood

Often it is the poor performance of the hood that leads to fogging of plastic windows, especially in the kitchen. All attempts to maintain normal air humidity will be nullified if the hood does not work. remember, that ventilation grates should always be clean. If ventilation does not fulfill its functions, you should contact special services to help clear the blockage.

Ventilation grilles are usually located in the kitchen and in the bathrooms, in order to ensure normal ventilation in the rooms, you must choose the right one interior doors... They must have overflow holes (gratings) at the bottom of the canvas. Or, the gaps between the floor and the door should be left up to 15-20 mm.

Increase in glass temperature

The window sill should not cover the radiator at all, this will significantly increase the temperature of the glass

To provide optimal temperature glass and minimize the risk of condensation on the windows, you should choose correct width window sills. The window sill should not completely cover the heating radiators. The flow of warm air must be able to rise upward, warming up the glass. If the window sills are wide, you need to think about inserting ventilation grilles into them.

Do not attach blinds and blinds to plastic windows too close to the glass., because they also interfere with the heating of the glass from the heat of the radiators. An important role in the glass temperature is played by correct installation the double-glazed windows themselves. Experts advise to choose two-chamber double-glazed windows with a larger system width. The assembly seam along the perimeter of the installation of double-glazed windows must not be blown through.

The coldest part of the window is the bottom. Therefore, the appearance of condensation is most often noted precisely in the lower part of the window.

Knowing possible reasons why plastic windows are sweating, it will be enough to simply eliminate the formation of condensation in the apartment with your own efforts. Whether the windows are good in your apartment, and whether the manufacturer is the reason for the appearance of condensation, will indicate the place of fogging.

Condensation is the most common problem encountered to PVC producers windows and their consumers. It should be noted that condensation is not only an unpleasant aesthetic defect, but can also cause moisture. building structures, and as a consequence of the appearance of mold!

Temperature according to standards indoor air in the premises must be at least + 18 ° С, in a number of regions territorial Building Regulations(TSN), which prescribed the temperature of living quarters not lower than + 20 ° С. If the temperature is below the standard, then it is necessary to check the heating system, because this can cause condensation to form.

Condensation occurs primarily at the bottom of the glass unit. Due to convection cold air accumulates in the lower part between the glasses. Therefore, the bottom and bottom corners of the glass unit are the coldest parts of the modern window construction... Since the question of the marginal zone often arises, the State Construction Committee of the Russian Federation gave an explanation on this problem in a letter No. 9-28 / 200 of 03/21/2002:

"1. Fallout of condensation in the edge zones on the inner surface of glass units in winter period operation, as a rule, is associated with the presence of an aluminum spacer frame in their design and the conditions of convection of gas-air filling.
International norms (ISO, EN standards) allow temporary formation of condensation on the internal glass of an insulating glass unit.
But the standards for window blocks do not normalize the formation of condensation, since this phenomenon depends on a complex of third-party factors: air humidity in the room, design features junction nodes of window blocks, insufficient air convection along the inner glass (due to a wide window sill board, improper installation heating appliances) and etc.

At the same time, it does not allow condensation to fall inside the glass unit, which should be considered a significant defect leading to a decrease in the standardized performance characteristics " .

Concerning high air humidity, then this phenomenon is characterized by the following main reasons:

• Insufficient air exchange due to excessive thick windows and as a consequence, bad job exhaust ventilation.
• Increased humidity in building structures due to recently completed building or renovation works... Building structures retain moisture for one to two years after the end of the work!
• Features of the everyday behavior of residents. For example, a greenhouse on the windowsill or drying baby diapers in the kitchen ...

New norms SNiP 23-02-03 "THERMAL PROTECTION OF BUILDINGS" determined the calculated parameters of the relative humidity of the premises to determine the dew point and the temperature requirements on the inner surface of the windows:

5.9 ... The relative humidity of the internal air to determine the dew point temperature in the places of heat-conducting inclusions of the enclosing structures, in the corners and window slopes, as well as skylights, you should take:
- for premises of residential buildings, hospitals, dispensaries, outpatient clinics, maternity hospitals, boarding homes for the elderly and the disabled, general education children's schools, kindergartens, nurseries, nurseries, kindergartens (factories) and orphanages - 55%, for kitchens - 60%, for bathrooms rooms - 65%, for warm basements and underground floors with communications - 75%;
- for warm attics of residential buildings - 55%;
- for premises public buildings(except for the above) - 50%.
5.10 Internal surface temperature structural elements glazing of windows of buildings (except for industrial ones) should be not lower than plus 3 ° C, and opaque elements of windows - not lower than the dew point temperature at the design temperature of the outside air in cold period year, for industrial buildings- not below zero ° C.

What other mistakes can lead to condensation? It is necessary to check the premises for cold surface!

Causes of Cold Surfaces may be associated with resistance to heat transfer and with blowing of structures... They can be as follows:

Errors in the manufacture of windows:

1. Installed "cold" double-glazed window with low resistance to heat transfer, which does not meet the standards.
2. Violation of the clearance tolerances, the use of a non-standard seal or improper installation of the hinges are the reasons leading to the blowing of the window.
3. In the non-opening sashes, drainage holes of 5x20 mm are made instead of holes for draining the cavity between the edges of glass units and the folds of profiles with a size of 5x10 or no more than 8 mm in diameter. That is it comes on violation of the provisions, clause 5.9.5 and clause 5.9.6 on the system of ventilation and drainage openings. We sent a letter on this topic, and we want to remind you again: according to GOST, there are drainage systems, and there are ventilation holes... it different types holes! In the letter of the Gosstroy of Russia No. 475 dated 09/10/02 in clause 2 it is stated that "when the doors do not open, the dimensions and location of the holes in the lower profile of the box should not contribute to hypothermia of the lower edge of the glass unit." Confusion in this matter is often associated with terminology: in GOSTs there is no concept of "fixed" glazing or a window, but there is the concept of "non-opening sash"! That is, in the version that in everyday speech we call a "blind window or glazing" in the terminology of the norms - "not opening sash"!

Installation errors

1. Execution errors assembly seam: incomplete foaming, which reduces the resistance to heat transfer; poor defense from climatic impacts outside, which leads to blowing or wetting of the foam; absence or poor vapor barrier, which also leads to wetting of the insulation, but already with steam from the side of the room.
2. "Cold bridge", when, due to improper design of the abutment unit, the window falls into a cold, sometimes even negative temperature zone of the wall. This reason is often encountered when profuse condensation occurs.
3. Blowing through a wall structure, for example, a brick wall, through empty seams - "wasteland". Such a phenomenon can be encountered on houses of the socialist period - the builders did not fill the vertical seams well. But this also became a problem in new construction with multi-layer walls, when mineral wool closed outside with bricks or other cladding. In this case, the insulation must be ventilated, and when the windows are placed in the plane of the insulation, they may be exposed to cold air from the side of the junction. In this case, it is better to separate the wall from the junction during installation with a layer of polyethylene foam 6-10 mm thick.
4. The wide window sill prevents the convection of warm air from the radiator in the window opening.

Hence we can give following tips to eliminate the possibility of condensation:

If, nevertheless, the condensation was the result of increased air humidity, then this reason must be eliminated due to the increased likelihood of mold in the room. To reduce the air humidity in rooms and transfer the dew point to lower temperatures, we recommend installing a Regel-Air climatic valve or ventilating the room for 10 minutes twice a day.

Heat loss with such ventilation is insignificant even in winter and is no more than 3 degrees.

The intensity of ventilation of the room must be increased when carrying out repair work.

The window sill should not be very wide and prevent the passage of warm air.

To allow warm air to pass to the window, place the curtains at some distance from the window sill.

Decorative screens for heating radiators should not impede the passage of heat fluxes from radiators.

The exhaust ventilation system in your home or apartment should be checked periodically.

One of the most effective ways the fight against condensation will be the installation of a window with a five-chamber system "Favorit", developed by the firm "THYSSEN POLYMER GmbH" (Germany) especially for Russia.

The temperature on the inner surface of the profiles directly depends on the heat transfer resistance of the profile system. For example, we can consider two cases - for outside temperature-26? C and at -31? C (at +20? C internal and 55% relative humidity). In this case, the dew point will be +10.7? С. The temperatures on the surfaces of a typical binding (three chambers and a width of about 60 mm) and a five-chamber binding with a heat transfer resistance of 0.78 m2? C / W will be as follows:

The material was prepared by Sergey Korotkikh,
LLC "Fenster".

Plastic Windows Are Installed, The Apartment Has Become Warmer, No Street Noise Is Heard. It would seem that all problems have been resolved, perfect comfort has come. But with the onset of cold weather, many consumers notice that the glass from the inside begins to sweat a lot, and a large amount of moisture appears on them. The question arises as to why condensation is collected on plastic windows if the previous wooden structures did not create such a problem.

Condensation process

A certain amount of moisture in the form of steam is contained in the air. When it cools, the ability to retain steam particles decreases, it settles on surfaces in the form of condensate. Window glass is cooled in winter by exposure to low outdoor temperatures. Colliding with their surface, the warm air of the room leaves its moisture, condensation appears.

Wooden-framed windows ensured natural air circulation, and some of the moisture escaped outside. Plastic constructions are sealed, so more condensation collects on them. The fittings of the latest models of double-glazed windows provide for the option of delicate ventilation. With the onset of cold weather, you need to put winter mode to reduce the accumulation of condensation.

Intense fogging of windows can be associated with high humidity in the apartment. This situation can adversely affect health, cause premature damage. finishing materials... At high humidity, viruses, pathogenic bacteria, and mold spores actively multiply.

The accumulation of condensation is the result of strong cooling of the glass surface. Perhaps the design of the double-glazed window was chosen incorrectly, the slopes are poorly insulated, and warm air from the radiator does not flow to the window.

Ways to deal with condensation on glass

Initially, you need to determine why in a large number condensation is collecting on your plastic windows. If the structures do not have a valve that provides micro-ventilation, it is necessary to ensure air circulation, periodically open the sash slightly. Need to check the work ventilation system... In old houses, it often does not fulfill its functions. Therefore, you will have to install special devices in the apartment.

This will help to lower the humidity level in the room, reduce the amount of condensation on the window, and create a favorable microclimate.

Warm air from the radiator must flow to the window. The wide sill does not provide access. If you make holes in it, the glass will warm up, there will be no strong temperature difference, no condensation accumulation. It is important to take into account that the flowers standing on the windowsills increase the humidity of the air. Therefore, you do not need to clutter it up with plant pots.

The largest accumulation of condensation is usually observed on the balcony. Most often, the problem is associated with a low air temperature inside. When installing glazing structures, serious attention must be paid to insulation in order to minimize the flow of cold from the street.

When choosing plastic windows, you should give up the desire to save money. Installation of two-, three-chamber double-glazed windows, equipped with a ventilation mode, an energy-saving film will eliminate problems with condensation.

With the advent of cold weather, people often turn to us with the following problem: condensation accumulates in plastic windows. Maybe at first glance there is nothing terrible here, but in fact this is a rather serious problem that is not so easy to solve on your own. Most often, so much seemingly innocent moisture in the windows indicates a depressurization of the glass unit - with all the ensuing consequences.

In this article, we would like to consider the main causes of condensation in plastic windows, and also talk about what to do about it.

Condensation on plastic windows: introduction

So, condensation has appeared on your plastic windows. It flows down to the windowsill, forms puddles, sometimes ice appears directly inside the room. It looks, to put it mildly, not very aesthetically pleasing, but even more unpleasant from a practical point of view. Due to the excessive amount of moisture, mold begins to form on the window frame, and the glass unit itself no longer protects the room from the influence external environment the way it should have.

You understand that you need to do something about this, but you have no idea where to start. In order not to waste time, we suggest contacting our consultant. If you go this way, then the problem can be eliminated as soon as possible.

Advice! If you notice that it began to see through from the window or some other misfortune has occurred, then it is better to immediately eliminate the problem. As long as it is warm outside, most likely it will not bother you. But when the cold weather comes, you will understand how serious everything was.

So why does condensation form in plastic windows? The main reason is the so-called dew point. When cold air comes into contact with warm air, steam is formed. This very vapor is trying to escape by any means. However, a plastic window is in his way. When warm steam comes into contact with a cold window, it turns into water - this is condensation.

The second most common cause of condensation is current interpanel seams... When installing plastic windows, all seams and joints must be closed. And not only polyurethane foam... Everything must be additionally waterproofed special means, and finally, be treated with a sealant that will not let moisture through. Then the design will serve faithfully for a long time. If this is not done, then the insulation, which is in the panel, will begin to gain moisture, and then give it to the room. This is where condensation will appear on the windows. It is difficult to cope with such a misfortune on your own, since it is difficult to detect current seams without special equipment. The professionals of "Heat of Home" will always come to the rescue.

Condensation on windows: reasons for formation and a guide to action

So, why does condensation form on pvc windows? Reasons and methods of struggle:

• High humidity... Of course, in the first place is high humidity in room. If the humidity in the room is more than 60%, then the formation of condensation on the windows is inevitable.

Solution... In this case, get rid of excess moisture indoors, you can use normal ventilation. You need to do it regularly. If this is the only problem, then when the humidity in the room returns to normal, condensation will stop forming.

• Wide window sill... Oddly enough, a wide window sill can also cause the aforementioned problem. If the window sill overlaps the radiator by more than 1/3 of its width, then it can thereby impede the flow of warm air. As a result, the window sill is cooled, the glass is cooled, the frame is cooled - the result: condensation inside the PVC window.

Solution... What to do? Select a window sill that will not block the radiator.

• Glass unit construction is another reason for window freezing. It only seems to you that the plastic windows are of the same type. In fact, they are very different from each other. Sometimes an incorrectly selected glass unit can be the very reason for the formation of condensation on it.

Solution... ... How to avoid this situation? You need to order plastic windows only from a trusted company, whose specialists will make necessary calculations, will take into account all the requirements and perform the work efficiently.

• Low temperature in a room as well as a high one can cause condensation to form. This happens when it is already cool outside, and the room has not yet begun to heat up.

Solution... To remove the "dew point" can be a banal increase in temperature in the room.

• Poor installation... Perhaps the most common reason for condensation in plastic windows is poor-quality installation. Today, many inexperienced companies have begun to work in this area, which are simply unable to take responsibility for their work. As a result, incorrect attitudes quickly manifest themselves. The owner is faced with problems that sometimes end.

Solution... In order to understand how to solve this problem, you need to know exactly what the mistake was made when installing the plastic window. If you cannot cope with the situation on your own, then you should contact our specialists for help. They will quickly identify all the problems and offer you several options for solving them.

• ... Sometimes condensation inside plastic windows appears due to the lack of regular maintenance window.

Solution... Adjust the window, lubricate all hardware mechanisms, possibly replace the seal. In fact, the problem could be anything. To say for sure, an individual examination is required. metal-plastic construction.

In fact, the problem could be anything. To say for sure, an individual inspection of the metal-plastic structure is required.

Thanks to the table below, you can independently determine the dew point temperature. To make calculations, you will need to find out with the help of a hygrometer and a thermometer the relative humidity in the room and the air temperature.

Why condensation forms in a plastic window: video

Especially for you, we have prepared a video in which we talk in detail about what can be one of the reasons for the fogging of a plastic window from the inside. The specialists of the Teplo Doma company promptly went to the call of one of the clients and decided to capture their work on camera.

So, in our article we figured out why condensation appeared in plastic windows. In the overwhelming majority of cases, this is due to the depressurization of the double-glazed unit, which means that with the need for its further replacement. To clarify the "diagnosis" and solve the problem, we recommend calling a specialist: an independent fight against condensation often does not lead to the desired results. You will surely feel the consequences of this approach in the coming winter.

Where to order repairs?

We are a company for which window renovation is not just a profession, it is a life choice. Without exaggeration, we know everything about plastic windows. And if you do not understand how to get rid of condensation on the windows, then the Teplo Doma specialists will be happy to help you with this. Do not postpone window renovation until later - consult with our consultants today!

Condensation on PVC windows that accumulates after installation is an unpleasant fact that customers face. The reasons why this happens are sometimes difficult to determine.

It is not clear what caused the condensation to occur. In order to get rid of troubles once and for the rest of the time, you need to know and understand the physics of this phenomenon. By identifying the cause and getting rid of it, you can enjoy the coziness and comfort in your home, which is created thanks to the new plastic windows.

Condensation physics, fogging of windows

The reason that causes fogging of the windows lies in the ordinary physical process that accompanies the transition of a liquid from one state to another during a decrease in temperature. This process is called moisture condensation. The air contains moisture in the form of steam when sufficient high temperatures, and when decreasing, it is able to retain much less liquid, and therefore it settles in those places where the temperature has the lowest value.

Since during a cold snap the glass surface has the lowest temperature in the apartment, condensation forms there. At high humidity, the deposition of condensation on PVC windows can lead to a serious problem, as a result of which the building structures will get wet, which can lead to the appearance of fungus. If inner surface the glass is too cold, this condensation can turn into ice.

Condensation on the windows, what to do?

Humidity is the main cause of fogging. Complete dehumidification of the air is almost impossible, and harmful. Normal human activity requires maintaining humidity at 50-60%. This moisture content is maintained by constant ventilation. It is also necessary to control the indoor air temperature. The higher it is, the less the window freezes and the less the likelihood of ice formation.

If you are wondering why there was no condensation on the old windows, but there is on the new plastic ones, then it is worth remembering that wooden frames are not so dense and are quite capable of passing air, and with it moisture. Therefore, it did not accumulate on glass or between frames. Plastic windows are so tight when closed that all moisture in the form of steam remains in the room and settles in the coldest place - glass, turning into condensation. Natural ventilation when installing old wooden frames it was laid down during the design, which is not used now.

Modern plastic or wooden windows with a dense porch are deprived of natural ventilation. To avoid oversaturation of the room with moisture, it is necessary to ventilate the room forcibly. Why condensation collects on plastic windows becomes clear already in the first cold days. Modern windows PVC is equipped with systems of delicate ventilation, which allows to reduce the humidity in the room in a timely manner. Air exchange in this case is carried out using a built-in micro-ventilation or air valve.

The problem of fogging or freezing occurs when, during construction or renovation, a wide window sill is installed along with the windows, which is subsequently cluttered with a mass of flowers. The flow of warm air from the batteries is blocked, which subsequently leads to condensation on the PVC windows and their further icing. I would also like to note that flowers in poorly ventilated rooms are also a source of high humidity, which aggravate the fogging process of windows.

It should be noted that an important criterion for correct and stable air exchange is the presence natural system ventilation, or a high-quality hood. Violations in the ventilation system or its absence can negate all attempts to organize this process correctly. The result will be increased room humidity and condensation on the windows.During construction or renovation, Special attention to devote to the issue of the device or reconstruction of the ventilation system.

The level of freezing of a window also depends on the glass units from which it is constructed. It is the double-glazed window that is the weakest element from the point of view of thermal physics, therefore, when choosing it, one must be the most careful. Currently, for the northern regions, 2-chamber double-glazed windows are used, consisting of three glasses, which include energy-saving glass. This fact significantly affects the reduction of the risk of condensation on PVC windows.

Features of a double-glazed window that affect the formation of condensation and ice

If you observe the distribution of condensate on the glass surface, you will notice that most of all it is located on the edge of the glass unit, since this is the coldest place. The aluminum spacer freezes the fastest. In the case when you cannot organize normal heat exchange and sufficient ventilation in your apartment, you should pay increased attention to this fact and order window frames with double-glazed windows, where the spacer is made of polymer material... This will minimize the likelihood of condensation occurring.

Let's say you have already built or renovated your home and you have condensation on your windows. How to get rid of it? There is a fairly simple way to get rid of it. Whatever modern instructions are attached to installed windows, the most the best way there was and remains - airing. This will make it possible to maintain the humidity in the room at the required level. Depending on the level at which this moment there is humidity, it is necessary to take breaks between airings and be regulated. By applying such methods, you will not depend on the mechanisms that are used in the design for these purposes.

How to get rid of condensation on plastic windows

A decrease in air temperature leads to the formation of condensation on PVC windows. This situation leads to the fact that water can collect and mold. The reason for this situation is the difference in temperature between the street, inside the package and the room. The moisture in the air of the apartment in the form of steam, under the influence of a sharp decrease in temperatures, settles in the form of condensation on the window glass and naturally flows down the water along the frames. Downgrade atmospheric pressure also plays a role in this process. However, this fact cannot be influenced, unlike other indicators.

Condensation on plastic windows, the reasons for which must be identified in the first place, can be easily solved by airing. Next, an examination of the room and the structure of the windows is carried out. Currently there is modern design plastic window blocks, consisting of double-glazed windows, equipped with air conditioning elements. In order to prevent condensation, you must adhere to the following instructions:

• It is necessary to increase the temperature in the room, this will allow to move the dew point and condensation will not form;
• Insulate the slopes and walls next to the window, both inside and outside. This should be done immediately, during the installation of PVC windows.
• You should not put wide window sills, as they block the flow of warm air from the batteries. It is worth installing warm curtains over the windows, which will keep warm in winter;
• Calculate the correct number of double-glazed windows for your windows, depending on the area of ​​your residence;
• Provide constant and sufficient air conditioning;
• Follow up correct thermal insulation window block during installation;

During severe cold weather, it is necessary to turn on additional heating devices that will help increase the air temperature in the room and thereby postpone the moment of condensation. However, it is worth remembering that this will not be a sufficient measure if you do not first track correct installation PVC window blocks. They must be insulated around the perimeter from the inside and outside. This will make it possible to keep warm, but this will not be enough if in this case it is not organized correct system air conditioning with forced draft or naturally.

An additional condition in order to avoid the formation of condensation can be the correct design of the thickness of the window block and the number of glass units. If your home is located in northern areas where winters are harsh and cold, then you need to consider the option of 2-chamber window units. Condensation on plastic windows, which can be caused by a large temperature difference, is also removed using equipment above the windows warm curtains... This method will increase the temperature in the room and stop the formation of condensation. Warm air, going down from top to bottom, will protect your window from the introduction of cold air.

Such problems are encountered in cases when not very high-quality window blocks are used in construction, after the installation of which the thermal regime in the apartment is not observed, and the access of cold air lowers the temperature inside the room and leads to the formation of condensation on the PVC windows. Finding out the reasons and analyzing the situation, you can easily get rid of this trouble with ordinary airing. In this simple way, you can maintain the thermal balance of your home and feel comfortable and cozy.