Ventilation of sewer riser - rules and solutions

24-04-2018

Ventilation

Surely every homeowner sometimes felt the penetration of sewage odors from the bathroom, which is quite unpleasant. It is possible to stop such manifestations by equalizing the pressure inside the drainage system. If done correctly, the care of the latter is not accompanied by noise and occurs unnoticed by those living in the house. Ventilation of the sewage system helps to solve this problem, as discussed below.

Main purpose

According to SNiP - sewage ventilation should perform 2 main functions:

remove waste odors from the system;
to prevent air depression in the waste system.

When the entire lumen of the funnel is blocked when draining the water, the drains can “pull” water from the siphons behind the failure. In an empty state, they can not prevent the penetration of unpleasant waste odors.

SNiP rules

Consider the requirements of SNiP for internal plumbing and sewage in terms of ventilation of the system:

The diameter of the ventilation system in the waste network must be the same as the diameter of the riser.
It is necessary to remove the ventilation pipe to the roof and attach it to the upper part of the pipeline..
The instruction allows connection together in one exhaust part of 4 or more risers. Then the diameter of the assembly of ventilation and exhaust must correspond to the diameter of the largest outlet in the group to be merged.
When laying the ventilation assembly, observe the slope for condensate drainage..
In unheated attics, the ventilation duct should be insulated., its price is only slightly increased.

Ventilated sewer riser on the outside of the building

Tip: Do not install caps, vane and other deflectors at the end of the exhaust pipe to increase resistance.

Pull out the sewage ventilation duct through the ventilation shaft of the house or the roof.

The height from:

flat unused roof - 200 mm;
pitched roof - 200 mm;
cut-off team shaft - 100 mm;
opening balconies and windows - from 4 m;
of the roof in use, if 4 pipes were combined - 3 m.

Tip: use a vent valve at the end of each sewage ventilation pipe if you cannot lift it 3 meters.

It is also allowed to do non-ventilated risers in country houses. However, the condition must be met - it is necessary to provide external sewage networks (for example, a septic tank) with ventilation.

Ventilation riser should be from the toilet siphon no further than 6 m

Solve the problem

If there is an opportunity to combine sewer ventilation with outlets into one network

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Bring the vent hood onto the roof of the house. Make sure that the height of the ventilation channel and the horizontal length from the water slide of the toilet bowl to the ventilation rack do not exceed 6m.
Install an individual ventilation outlet or a vacuum valve on each sanitary fixture, when the toilet is removed from the ventilation with a pipe diameter:

110 mm - from 6 m;
50 mm - from 3.5 m;
32 mm - from 1.5 m.

If the ventilation of the sewer network is removed from the sanitary plumbing taps

Install a vent on each plumbing fixture.
To the water gate should be no more than 1.5 m.
The vent should be placed higher than any knee in the system by 300 mm or more.
Connect the ventilation valve to the general ventilation leading to the roof.

Malfunctions:

if the sewage ventilation does not function or does not work well, it means that the system does not have an appropriate slope.
an unpleasant smell still penetrates into the room - the diameter of the taps of plumbing fixtures is not correctly chosen.

Air valve for non-ventilated sewer risers and its principle of operation

How to do without ventilation of the waste system

Before answering this question, you should find out what is the main element of the ventilation sewage system. This is a fan pipe used to connect the riser to the ventilation duct. If it is absent, you will soon have to deal with the withdrawal of unpleasant odors from the house.

Existing construction standards for buildings and private houses no higher than 2 floors allow the use of sewage systems without installing a sewage pipe. This is due to the small volume of single-stage wastewater discharges.

Tip: a sewage riser is always installed when one-time sewage drains can reach a volume that can completely block the diameter of the sewer pipes.

If the sanitary equipment installed in the house does not work at the same time, the sewer does not overlap. At the same time, the situation may radically change when they all work at the same time.

To determine the likely maximum one-time discharge of sewage into the sewer, it is necessary to take into account their volume from each sanitary engineering facility located in the building.

There are certain standards of this value, presented below:

toilet and bidet - 10 l;
washing - 20 l;
washing machine and dishwasher - 50 l each;
shower cabin - 100 l;
ordinary bath - 220 l;
corner bath and jacuzzi - 450 l.

In this case, the peak value will be 1360 l.

Conclusion sewage ventilation to the roof

Ventilation must be installed, regardless of a one-time discharge of sewage, when:

Domestic sewers are O 50 mm or less;
the house has 2 or more floors, with water and sewage systems installed on each;
on the plot adjacent to the house or in it itself has a swimming pool, a large font or bath.

Tip: installing a funnel pipe will protect the atmosphere of your home from unpleasant odors from the sewer system forever.

Conclusion

Ventilation in the house can be different, but it is the sewer riser that makes it possible to eliminate unpleasant odors in the atmosphere of the house. In this article we told how to properly place it in relation to all plumbing fixtures. Recommendations were also made on the rules and regulations of SNiP. The video in this article will help you find additional information on this topic.