Aerator for a flat roof

For a flat roof to last a long time and function well, adequate ventilation must be maintained. The aerator is a crucial part that helps with this process. An aerator is a device that is used to control moisture content and encourage air circulation. It is useful in avoiding problems like mold, decay, and structural damage.

The way an aerator operates is by letting fresh air into the roof structure and stale air out. This exchange lessens the accumulation of moisture that over time may weaken the roof’s integrity in addition to aiding in temperature regulation. A functioning aerator becomes essential, especially in climates that are prone to high humidity or frequent precipitation.

Aerators are typically positioned strategically throughout the surface of the flat roof and can be of several types, such as ridge vents, turbine vents, and static vents. Various airflow requirements are catered for in each type, taking into account variables such as building configuration, environmental conditions, and roof size. To guarantee optimum performance and efficiency, selecting the appropriate aerator entails taking these aspects into account.

Aerators must receive routine maintenance in order to continue operating efficiently. This entails routine examinations to remove any debris that might impede airflow, looking for wear and tear, and confirming that the mechanisms function properly. Property owners can greatly extend the life of their flat roofs and improve the building’s overall comfort and safety by adding aerators to their routine maintenance schedule.

Function An aerator for a flat roof helps to ventilate the roof space, preventing moisture buildup and reducing the risk of mold and mildew.
Benefits It improves air circulation, prolongs the life of the roof materials, and enhances energy efficiency by regulating temperature extremes.

Moisture in the undercarbon space: Causes

Diagram of an aerater device for an operated roof: Expanded clay, reinforced concrete overlap, light concrete that separates, vapor barrier, insulation, screed, waterproofing, washed gravel backfill, paving slabs, protective cap, and so on are the first ten elements. 11. The Aerater Corps.

Soft roof installation is becoming more and more common in both civil and industrial construction. A reinforced concrete floor, a vapor barrier layer, a cement-sand screed, insulation, another cement-sand screed, a waterproofing layer, and roofing material make up the traditional installation, which is akin to a "puff pie." Blooping of the coating material and subsequent leak formation are the main issues that arise when the soft roof is operating. Aerator installation reduces, if not completely eliminates, the possibility of these occurrences.

Bloating is the outcome of moist air vapors from upper floor premises penetrating a subcutaneous space. Condensation therefore forms when there are flaws in the vapor barrier layer of the cement-sand screed and insulation.

The thermal conductivity of the insulation is adversely affected by this process. Not only does getting wet insulation result in a nearly two-fold increase in heat consumption, but mold grows in an impenetrable undercarbon space. Increased heating expenses result from heat loss, and mold fosters the growth of numerous illnesses.

In light of the aforementioned, installing an aerator is required when setting up a flat roof.

Moisture in the undercarriage: the need for drying

Plan for aeraterizing devices on non-explosible roofs: Expanded clay, overlapped reinforced concrete, vapor barrier, insulation, and four other elements Screed is number five; waterproofing is layer six; waterproofing is layer seven; an aerator corps is number eight; and a protective cap is number nine.

When moisture and condensate build up in a cement-sand screed and heater, they freeze and can demolish the screed, roofing, and waterproofing layers as their volumes increase. Aerators are mounted on the roof to lessen the buildup of moisture in the soft roof’s subcutaneous space.

In the event that a significant amount of moisture and condensation has accumulated, the burden must be dried before repairs can be made. To accomplish this, disassemble a soft roof completely and replace every component. Installing turbine-style roofing aerators is an alternative if you want to avoid the operation’s high cost. They will spare you from costly repairs and enable you to quickly dry the insulation and remove condensate. The aerators and the air circulation they produce will determine how quickly evaporation occurs.

The soft roof’s surface can get as high as 90 °C in the summer, while the temperature beneath it is only 70 °C. In order for the moisture to evaporate, it is crucial that these air masses with varying temperatures are mixed. Aerators designed for flat roofs can easily handle a comparable task. All of the soft roofing’s layers will regain their characteristics after drying.

Aerators: types and installation

The purpose of the roof-mounted aerators, which come in different shapes and sizes, is the same: to remove moisture and condensate, to ventilate, and to remove moist air. Installation can be done both during the building process and when the roof is in use. Aerators must be installed during repair work in order to stop leaks from forming and roofing materials from deteriorating.

Diagram of the inversion roof’s aerator device: Expanded clay, reinforced concrete overlap, light concrete that can separate, vapor barrier, insulation, screed, waterproofing, drainage layer, backfill of washed gravel, paving slabs, protective cap, and aerator corps are the first, second, third, and fourth elements.

The product’s case ought to be made of materials that can withstand temperature fluctuations and corrosion. The most well-liked currently:

Their technical attributes, roof area, condensation and moisture concentration, and roofing condition all affect how many aerators are required. Aerators are positioned uniformly throughout the space on a soft roof. These gadgets can typically tolerate temperatures between -50 °C and 90 °C.

These include laundry rooms, swimming pools, and baths, if the interior is specific.P. It is preferable to determine the required number of aerators during the design phase.

Ventilation pipes are installed to provide ventilation for roofing. If you perform this procedure by hand, it is quite realistic and easy to understand. These aerators are sturdy polyethylene pipes with an umbrella covering that range in diameter from 6 to 12 cm. They are covered to prevent moisture from atmospheric precipitation (rain, dew, fog, snow, etc.).

A hole that extends to the insulation layer is created during the installation process on the roof at that specific location. The hole’s diameter should match, but not exceed, that of the aerator (ventilation pipe). The insulation needs to be changed first if it’s damp. The aerator pipe’s bottom is firmly pressed to the soft roof’s base after being lubricated with mastic. Apart from this mounting, self-tapping screws are used to secure the aerator skirt in multiple locations throughout the circle. Further waterproofing must be arranged at the bottom of the ventilation pipe.

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"A flat roof aerator is essential to preserving a flat roof system’s longevity and health. These devices aid in preventing moisture buildup, which can result in the growth of mold and structural damage, by promoting appropriate air circulation and ventilation. In addition to controlling temperature swings, efficient aerators also improve indoor comfort and energy efficiency. Aerators are a worthwhile investment for any property owner wishing to increase the lifespan of their roof since they ensure the performance and durability of flat roofs when installed properly and with an understanding of their advantages."

Roof aerator – practical recommendations

A device called a roofing aerator is used to extract moisture from the roof layers. The apparatus consists of a 6 to 11 cm diameter stainless steel or polypropylene pipe with a cap fitted to shield the fan from atmospheric precipitation. The aerator speeds up the condensation fume process and provides drying for the heat insulator.

Because of their exceptional operating characteristics, which allow them to withstand temperatures between +90 and -50 degrees, they are used in a variety of climatic regions.

The purpose of the roofing fan is:

  1. Condensate elimination.
  2. Ventilation of roofing layers.
  3. Elimination of wet air.
  4. Preventing the processes of destruction of roof layers.
  5. Prevention of roof leaks.

The device works on the principle that traction forms in the pipe when low pressure occurs, which is caused by wind flows from the outside.

Types of aerators

You should deal with their types before installing a roofing fan.

By means of constructive execution, various categories of devices are identified:

  1. Pointed. The device is made in a mushroom form, equipped with a fan. They are installed in places with limited access, for example, a complex configuration of the surface of the roof, the windows of the attic. In turn, point aerators are:
  2. Skate – are installed under the skate, their task is to eliminate vapors and condensate throughout the skate structure;
  3. Naughty – are used in areas where the circulation of air masses is required.
  4. Continuous. Are located evenly over the entire surface of the roof, thereby ensuring the ventilation of all its layers, as well as attic and attic areas. The ridge fan and moisture -resistant ventilation tape, which are placed in the waterproofing layer, are considered the most recognized.
  5. Turbine. They have the appearance of the pipes, equipped with an electric or exhaust with an electric drive. It is recommended to use devices made of aluminum due to the fact that this material is resistant to corrosion and does not change the form when exposed to high temperatures. When choosing a fan, you should take into account the slope of the roof. Typically, the manufacturer indicates on the packaging the slope of the roof corresponding to a particular device model.

Which aerator to use for various kinds of roof

Every kind of roofing has a specific tool used for it.

An impact-resistant, atmospheric polypropylene device is ideal for a soft coating. They are frequently positioned at the highest points of the coating or at the joints of thermo-insulating plates, equivalent distances apart.

  1. Eliminates steam from under the roof layers.
  2. Reduces pressure in a burden.
  3. Warns the formation of condensate.

The fan housing on a metal tile roof is composed of corrosion-resistant material that can withstand exposure to high and low temperatures, acidic media, and ultraviolet light. Polypropylene and stainless steel are the best of them. The locations of the openings from the self-tapping screws and the formed cracks beneath the roof’s coating indicate where moisture accumulation occurs on a roof of this kind. Any area of the roof can have fans installed in it.

It is constructed from materials resembling the roof of metal tiles in order to conceal the deflector case from the profiled flooring. Place the devices 50 centimeters away from the ridge; their purpose is to remove moisture and stop the roof’s material from deteriorating.

Installing deflectors on the coating canvas is the best option for the ventilation system device.

When installing a new roof, roofing fans are installed in phases:

  1. Before installing the device, markings should be made on the surface of the roof, where they will be located.
  2. In the estimated place of installation of the fan, an opening is cut in a cement-sand layer so that it reaches thermal insulation. The circumference of the hole should be 8-12 cm.
  3. Expanded clay gravel is poured into the formed hole.
  4. If the moisture holes in the heat -insulating layer are detected in the process of cutting.
  5. To ensure reliable fixing the deflector to the lower part of the device, apply mastic or other sealing agent.
  6. After solidifying the sealing agent, the device is additionally strengthened using six self -cutting screws that are screwed around the circle of the “skirt” of the pipe.
  7. Then the top layer of the roofing is laid. At the same time, the deflector should be located at the site of the end connection of the roofing panels, while the width of the overlap should be at least 15 cm.
  8. The junction of the aerator and flooring should be poured so that the lantal closes the “skirt” of the deflector and goes to cover the roofing material. The patch material is taken the same as to cover the roof.
  9. The final stage is the sealing of all cracks with a composite polymer to prevent possible leaks.

Features of the installation of aerators for different types of roof

  1. On the pitched roofs of metal tiles, deflectors are installed at the highest points of the roof, but a distance from the ridge at a distance of at least 50 centimeters.
  2. To install the device on a flat roof, places on the hill in the joints of the joints of thermo -insulating blocks are determined.
  3. On the gable roof with the skate and the apple installation of fans is carried out along the water distribution line.
  4. On the folding roof, it is recommended to install the aerator at the junction under the horse.

A vast array of different models of roofing ventilation devices are available from building material manufacturers. Their cost varies based on the modification and purpose, ranging from several hundred to several thousand rubles.

Roofing fans typically cost the following, depending on the type:

  1. Continuous aerators (installed throughout the coverage area) – from 270 rubles.
  2. Point fans (one device can ventilate 20 m2 of roofing space) – from 400 rubles.
  3. Turbine deflectors – from 300 to several thousand rubles.

There is also an impact on the device’s cost. The approximate costs for a few device models are as follows:

  1. Aerator of 3 parts calculated up to 60 m2 roofs-an average of 450 rubles.
  2. Aerator of 3 parts calculated up to 60 m2 coatings, for regions with abundant atmospheric precipitation-600 rubles.
  3. Aerator of 4 parts, calculated up to 100 m2, for regions with abundant atmospheric precipitation-850-900 rubles.
  4. The aerator of 3 parts, calculated up to 100 m2 coating, contributes to the occurrence of additional traction-1200 rubles.


  1. Roof aerators can be installed not only when arranging a new roof, but also when repairing old coatings.
  2. Fans must be installed based on the shape and size of the roof, the state of vapor barrier.
  3. Experts recommend buying all the elements of the ventilation system from one seller in the kit.
  4. According to the requirements of the construction rules and norms per 100 m2 of coating, one aerator should be installed and the distance between them should not be more than 12 meters.
  5. For objects with a high moisture level, the ventilation system calculations should be carried out by companies specializing in this area.
  6. Installation work on the installation of fans is best done in the summer.

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  • Aerators on the roof

    The main purpose of the aerator for roof ventilation is to remove moisture from the undercarbon space, as well as ventilation of all layers of roofing pie. The most sensitive to moisture is a soft roof. Its design is a multi -layer structure, with the arrangement of which the materials are laid with layers. The basis is the reinforced concrete coating plate, it plays the role of a barrier between the inside of the premises and the external environment. During operation, the roofing can swell and exfoliate due to the penetration of wet fumes from the inside of the building. To prevent such situations, as a preventive event, aerators are installed on the roof.

    How the aerator works

    • acidic and alkaline effects;
    • ultraviolet radiation;
    • temperature differences, material should equally well tolerate minus temperatures and heat;
    • corrosion.

    Stainless steel and sturdy technical plastics are currently the best choices.

    On a flat soft roof, roof aerators are often placed uniformly throughout the roof’s surface. One aerator should be installed for every 100 square meters of roof space. Don’t put on amateur shows, regardless of the roof’s construction or style. Expert calculations based on the source data determine the number of devices and their design. These are the following:

    • roofing area;
    • technical characteristics of the roof;
    • laying the composition of the roof pie and its condition;
    • The level of moisture concentration inside the building and under the roof.

    All computations regarding the number and locations of aerator installations on roofs for purely specific premises with elevated humidity levels are carried out during the design phase. We’re talking about saunas, swimming pools, and laundry rooms. This will help prolong the life of the roof service, but every developer should consider installing this essential device.

    Features of the installation of the aerator

    Choose solutions that are constructive first. Aerators are continuous and point-like. The former are spread across the whole roof’s surface and serve to ventilate specific roof sections. On a soft roof, the second aerators are installed all the way along the roof to allow for complete roof ventilation.

    Two types of point devices are available:

    • Raise are installed on a continuous surface of the roof. Places for their location choose those where you need to strengthen the air movement. Special attention is required by individual components of complex roofs: yendovs, attic windows, lanterns, crests. In these areas, it makes sense to install aerators for soft or other roofs on both sides of the obstacle.
    • Skate is mounted on the skate. The mass of warm wet air, as a rule, rises from the inside of the rooms up and goes out through the ridge structures. At the same time, cornice ventilation ducts serve portions of fresh air from the outside. Thus, the air mass renew. Soft roof skating aerators help strengthen these processes, as well as the removal of bituminous fumes from roofing material.

    Aerators can be installed as an independent procedure for the existing roof or as part of the roofing replacement process during the building’s construction. Although it is possible to install the aerator for a flat soft roof on your own, it is advisable to leave this task to the experts. The procedure itself appears like this:

    • First you need to determine the installation sites of the deflectors and select their design.
    • In the roofing, a window is cut out by 10-20 mm size wider than the diameter of the pipe.
    • The perimeter of the resulting hole along all thickness must be abundantly smeared with bitumen mastic.
    • In the same way, a pipe of a roof aerator for a soft roof should be treated in the same way.
    • The pipe is inserted into the window, fixed and then the entire structure is assembled.

    Specialized roof fasteners are used for the mount to the main coating (screws, dowels). The locations where the aerator and roof conjugate need special attention. It is preferable to apply an extra layer of roofing material or waterproofing to ensure an aerator skirt.

    A flat roof’s lifespan and efficiency can be greatly increased by installing an aerator. Aerators aid in preventing moisture buildup, which is essential to preventing mold growth and structural damage by promoting adequate ventilation. By releasing hot air in the summer and minimizing heat loss in the winter, they also help to regulate the temperature inside.

    Selecting the appropriate aerator type and size is crucial. There are models that are fixed and adjustable, with options for varying airflow capacities to accommodate different roof sizes and climates. To find the best aerator for your particular needs, it’s critical to evaluate variables like humidity levels, prevailing winds, and roof slope.

    In order to guarantee optimal performance, aerators require routine maintenance. Maintaining regular airflow and avoiding possible problems like water pooling during heavy rains are ensured by clearing debris and looking for obstructions. Examining seals and connections also contributes to preserving the roof’s structural integrity and extending the aerator’s life.

    All things considered, designing your flat roof with an aerator improves air circulation, increases energy efficiency, and protects the structure from issues caused by moisture. Investing in high-quality aerators can yield long-term benefits for both residential and commercial buildings by maintaining the condition of the roof and raising indoor comfort levels.

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    Alexandra Fedorova

    Journalist, author of articles on construction and repair. I will help you understand the complex issues related to the choice and installation of the roof.

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