Not everyone knows why a sewer system needs access to the roof. In fact, the fan stand is an important part of this system and with insufficient attention to installing it, the result can be unpleasant. The article discusses in detail what a sewage riser in a private house is like without access to the roof or brought out through the roof (which is done more often) and why it is needed. Having understood this question, you can choose to install the most high-quality and reliable option.
When building a private house, you need to bring to it various communications. One of them is sewage. At first glance, you might think that it is enough for it to equip only the sewage. In fact, this is not enough.
In order to clarify the purpose of the funpipe, you need to remember how the toilet flush in more detail. After sewage coalesces, a certain amount of water flows there. Part of it remains in the toilet. It is actually a water seal, the role of which, in particular, is that the unpleasant smell from the drains does not enter the living quarters. It is important to understand that this protective layer of water is inside the toilet bowl.
If there are several such sanitary appliances in the house, then each of them, which is not in use at the moment, has such a water seal.
When one of the toilet bowls is drained, then for a short period of time immediately after the outflow of sewage and drained water, the pressure decreases here. Since all the others are connected to this pipe, hydraulic locks are broken in them and unpleasant smell penetrates the premises.
It is important to note that this situation exists not only in relation to toilet bowls, but also all drains that are connected to the sewer. For example, we can talk about the water seal in the bathroom or in the sink, if they are connected in this way.
This situation could have been avoided if the pipe had an additional outlet through which air could freely flow into it. At the same time, a low pressure in the place of discharge would not have arisen and the hydraulic locks would not be violated anywhere.
Odors from a sewer could also come out through a similar pipe. The funnel is a pipe that performs the specified functions, which is connected to the sewage system of the house and brought outside it.
As far as necessary. In fact, the system under consideration is actively used in apartment buildings. In the sewer system, the flow of apartments occurs in a vertical pipe.
Its lower end is connected to the drain system, and the upper one is brought to the roof and actually performs the function of a funk riser.
For the outlet pipe, there are no regulatory requirements defining the diameter. Usually for this purpose in apartment buildings use a pipe similar to the sewer.
Suppose in a private house a pipe with a diameter of 5 cm is used for a drain from a sink, the drain of a cistern is 7 cm, a pipe from a toilet bowl is 10 cm. In this case a fan pipe on a roof with a diameter of 10 see
Practice confirms that such a pipe is sufficient to provide constant pressure in the drain system and to provide ventilation in it. If we are talking about a one-story private house, in which only one toilet is installed, then you can do without installing a standpipe.
This is due to the fact that the drain in this case cannot create a sufficiently strong drop in pressure, so that you can feel the unpleasant consequences.
However, in some cases, foot drains on the roof are necessary:
If the house has at least two apartments with fully equipped sewage systems, provided that they are connected to a common network.
A sewage exit to the roof for ventilation of the riser is required in a house where more than two floors are available.
If there is an equipped horizontal sewer pipework provided that three or more number of plumbing fixtures are connected to it.
Also it is necessary to provide:
Although drain sewage systems have diameter at 10 cm, however, sometimes there are situations when a pipe with a diameter 5 cm is used for this . Then the output of the funnel pipe on the roof is mandatory .
If the house has a pool that discharges water into the sewer system , the use of the construction in question also you need . This is due to the fact that in such a situation it is possible to discharge a large amount of water.
Fan stand, access to the roof is needed when drain occurs in private septic tanks located next to by home.
If the house is single-storey , but the bathroom and the toilet is located on different levels, and the drain happens in one pipe .
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When installing the riser, it is important to pay attention to some points:
It is not necessary to underestimate diameter outlet pipe. If it is too narrow, then its thickness may not be enough for quality work. A pipe with a diameter of 100 mm is most suitable for this purpose.
The horizontal part of the sewer system should not be located at one level . In this case there is a risk of water or air traffic jams. It is recommended that the pipe be installed with a slight incline . It is usually considered sufficient to use a slope of two centimeters per meter of length for this.
Sometimes when installing the system, the output of the riser is not on the roof, but on the attic . This categorically is not recommended. From exposure to outgoing air, a layer of heat insulation on the roof can be saturated with moisture. Another consequence could be rotting rafters.
When installing a pipe on the roof, sometimes a deflector is installed on its opening. It will protect against falling precipitation and accidental debris. In addition, its influence in windy weather will be expressed in an increase in thrust . But there is another opinion. It is believed that this or another additional device installed above the pipe hole contributes to the formation of condensate , which in winter frosty weather will lead to icing of the pipe from the inside. As a result, it will be partially clogged and may cease to perform its functions.
When installing, consider:
It is not recommended to drain the pipe of the sewer riser away from the vertical sewer drain. If for some reason this is difficult to do, then the transition connection is best made with corrugated pipes.
It is considered that the height of the pipe above the roof should be 50 cm . It is recommended to place the exit on the roof at distance at least 4 meters from balconies or windows.
The reliability of the system will be higher if you set the check valve. It is installed in the place where drain enters the common sewer pipe. Its effect is that drains freely flow out of an apartment or house, and in reverse direction gases and fluids do not penetrate at all.
Video with a detailed story about what a fan pipe is, how it works, how to make it, how to prevent odors from sewage and avoid mistakes:
On our website you can find contacts of construction companies that own a full cycle of their own production , provide a water supply and sewage service . Directly to communicate with representatives, you can visit the exhibition of houses "Low-rise Country".
to the roof Sometimes in apartment buildings the residents of the upper floor independently dismantle the riser pipe leading upwards.
The motivation for this decision is the lack of knowledge of the principles of sewage and the idea of a fan stand as something superfluous and unnecessary. Shortly thereafter, a persistent odor from the sewer pipe appears on the upper floors.
You can correct the situation. At the same time there is no need to put the fan pipes on the roof. It is enough to attach a special valve to it. It will not let the air out, but when a low pressure zone is formed, it will let in air into it, which will prevent violation of hydraulic locks.
Such a riser is not necessary to bring to the roof.It is necessary to install the valve in the upper part of the sewer system. Although it is convenient (there is no need to equip the pipe passing through the roof), but such a device does not have high reliability.
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To install the sewer riser, pay attention to the following:
When removing the pipe to the roof you need to close the hole with the grating . It is necessary to protect against birds.
Sometimes during operation of this system, a low unpleasant noise is heard. In order to get rid of it, it will be necessary to wrap pipe with noise insulation coating.
It is not always possible to bring to the roof a funnel from each sewer system. In this case, you can provide one pipe for several risers .
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It can be used for this plastic or cast iron pipes. There are several options for their laying. It can be straight, oblique or with a horizontal section. The first of these options is considered the most effective, but it can not be implemented in all cases. Less suitable is the location of the fun pipe at an angle.
If the installation cannot be completed by the previous methods, then you have to use installation, where the horizontal section of the pipe will be used. It is laid within the attic from the point where it will be possible to install a vertical pipe.
The exit of the fan pipe on the roof is performed in one of the following ways:
It can be made in the form of a pipe on the roof .
Sometimes it is made through the wall under the bevel of the roof.
Sometimes it happens that the outlet is inside the attic of the room.
The last option is of lower quality. At the same time, moisture escapes through the pipe, which can lead to condensation and rotting of the roof. In addition, odors inherent in sewers spread through the pipe. When it is located on the roof, this effect is minimized.
The second option is considered vulnerable to icing.
In the attic, you can equip the outlet from the riser only if you install a special valve there that air can pass only inside, but not outside.
A story about a fan stand for ventilation of a septic tank, see the following video:
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The use of funnel risers is mandatory, except in a one-story private single-family house. If you do not take care of this, unpleasant smells will constantly appear in the apartment. Properly chosen system for installing the riser will finally solve this problem.