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Sewer ventilation and 2 mistakes made during repairs

July 7, 2016
Specialization: master of interior and exterior decoration (plaster, putty, tile, drywall, wall paneling, laminate, and so on). In addition, plumbing, heating, electrical, conventional cladding and balcony extensions. That is, repairs in an apartment or house were done on a turnkey basis with all the necessary types of work.

Sewer ventilation scheme in a private house - a fan pipe exits through the roof

Clean air in a residential area will always be one of the first needs, therefore, sewer ventilation in a private house - created by oneself, is one of the conditions for installing plumbing. In addition, in some cases, ventilation must be equipped in apartments in multi-storey buildings.

I will now tell you how this is done, and I also want to invite you to watch the video in this article.

Hoods for sewerage

It is necessary to distinguish between ventilation of the room and ventilation of the sewer system in an apartment building or in a private house.
And the difference lies in the fact that the arrangement of the second option does not provide for the presence of unpleasant odors at all.

Frequent 2 mistakes

There are at least two common misconceptions about such devices:

1. Since I have a fan pipe in my house or apartment, that is, ventilation of the sewer riser (bed), it means that all unpleasant odors from the system should come out through it. However, we are very surprised if this does not work. But the thing is that the most common source of stench is either damaged pipes, or the lack of hydraulic valves due to the banal non-use of any bathroom (a column of water can evaporate).
2. But the second mistake concerns the residents of the upper floors who have access to the fan pipe - when repairing or replacing plumbing equipment in the toilet or bathroom, it is removed altogether. The reason here is the poor condition of this pipe - due to the long service life, they are pretty damaged by corrosion. But by drowning out the riser, you create a problem not only for yourself, but also for all your neighbors living below on all floors. The smell will penetrate into the apartments with each descent of the toilet.

Let's start with the fact that ventilation from sewer pipes in a private house, especially if there is more than one toilet, should be at least 4 m above ground level. As a rule, the fan pipe is led out through the roof. This will keep the water in the hydraulic seals from evaporating too quickly, and will also allow you to compensate for the difference in air pressure when flushing a toilet bowl or two toilet bowls at the same time from the cistern.

When the water is drained from the toilet, its volume completely fills the diameter of the pipe and, when moving, rarefies the air after it, which leads to the exhaustion of these same water seals. But the fan pipe compensates for this difference. As a result, you get the absence of unpleasant odors in the room.

I have already said about the diameter - it should be the same as in the system itself. But is it possible to use pipes from another material, for example, to combine the laying of a PVC system with an asbestos-cement or metal fan riser?

The answer here in any case will be unequivocal - yes, you can. Only in this case, another question arises - is it necessary? It is best to use polyvinyl chloride for a fan riser, even if your wiring is made of metal or asbestos cement (it happens) - PVC is very light, strong, and its service life is 50 years or more.

The ventilation insert is made at the highest point of the sewer system, made from the widest pipe. That is, if the main system has 110 mm, then the connections to it will be made from a diameter of 50 mm, but they, of course, will be higher, although it is desirable to make a tie-in on the 110th pipe (you can also on the 50th, but the effect is diminished ). Most often, this point is the connection point of the toilet.

One of the options is to bring ventilation through, as in the top photo - this will most likely increase the price of the structure, but this option is quite convenient. Such a letter G should be made with the same material as the system itself, and the riser can already be mounted from PVC.

If for a small one-story house, when arranging ventilation, you can use a 50 mm PVC pipe, then for several apartments you will need at least 110 mm. In addition, it makes no sense to install a larger diameter pipe with your own hands, on a system with a smaller diameter - the costs will increase, but the effect will not change.

Conclusion

No matter how you want, but a private house with internal bathrooms such as a toilet, in any case, will need such a device as sewer ventilation. Otherwise, a host of unpleasant odors awaits you. At the same time, do not forget about hydraulic gates, and if you have any new solutions or projects, please join the discussion in the comments.

July 7, 2016

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