The need to replace the sewer riser in the apartment arises as the pipes wear out. This is easier to do in your own home, since you do not need to take their neighbors' consent. When replacing the riser, you need to save the ventilation pipe that goes to the roof. If this condition is violated, the water seals in the house will not work properly, which will cause an unpleasant sewer smell.
Determine the need to replace the riser
If there are cracks and holes in the riser or if the horizontal pipeline is lowered, it must be replaced. The new riser requires tees in order to be able to carry out internal wiring. Pipes located horizontally in the screed and the tee can be lowered to the ceiling and pipes, which can be up to 10 cm.
Replacing the sewer riser in the apartment is the responsibility of the housing and communal services, however, if you live on the top floor or in your house, you can try to carry out this operation yourself, but you must strictly follow the instructions.
Sewer riser device
To orderin order to replace the riser, you need to imagine its device. Intra-apartment sewerage is arranged quite simply. The device of the sewer riser in the apartment has the following features. The pipe at the place of reception of sewage is placed a level higher than the place of their runoff. The slope along the length of the pipe to be laid must be uniform. The lower point of the drain pipe is introduced into the common riser near the interfloor ceiling. The height of the placement of the beginning of the pipe is calculated taking into account this point. For pipes, it is necessary to provide for a slope within 2% with a diameter of 80-100 cm and 3% with a diameter of 40-50 cm. Exceeding this slope will lead to the fact that only clean water will quickly move through the pipes, and sewage will accumulate in them. With a lower slope, grease and water will enter the riser.
The riser must include a ventilation device, which must be present both in the apartment and in the house. It helps eliminate unpleasant odors, as well as compensate for pressure inside the riser. The arrangement of ventilation is carried out either by a fan riser leading to the roof, or by a ventilation valve, which forms non-ventilated sewer risers. The latter is installed in the part of the riser located above the appliances and sanitary ware connected to it. It is better to entrust the appropriate specialists to replace the cast-iron riser. If there is no desire to contact them, then you must follow the instructions below for replacing the sewer riser inapartment.
Tools and materials for replacing the sewer riser
It is necessary to stock up on a grinder or a pipe cutter, a chisel and a screwdriver to remove the cut material (we remove larger metal pieces first, smaller ones second). You will also need a hammer (in order to loosen the desired section of the pipe), a nail puller and a crowbar (to remove elements that have clogged the system). In addition, you should get a perforator (for removing cement at the joints), a cut from polyethylene (for isolating potential holes), a grinder (for preparing the surviving parts of the pipes for leading the mounted riser), gloves and goggles.
Pipe chiselling
The first operation when dismantling the old riser is caulking the pipes. The fact is that the pipes at the junctions are attached to each other with sulfur, which must be disposed of. To do this, you need to gently hit the socket with a hammer (beating with all your might can lead to the replacement of the entire riser, which will result in a pretty penny for the apartment owner or installer). With visible reeling of the site, it must be continued to loosen in different directions. If loosening occurs within a short period of time, then this most likely indicates that the connection was made not with the help of sulfur, but with a rope that needs to be hooked and pulled out without stopping the wobbles.
In case of no results when tapping with a hammerit is necessary to take a burner or a blowtorch and heat up the place of wedging in a circle. Don't forget to wear a gas mask or respirator. When burning out, the wedging point is tapped with a hammer. During the start of the movement of the bell, it must be loosened with an adjustable wrench, while sipping on itself. At the end of the extraction of the socket, the place of its former fastening is cleaned with a mount, chisel or chisel. This will allow the sealing gum to stand up correctly, which is treated with silicone, inserted into the socket and a tee or a mounted plastic pipe is brought in.
Replacement of pipes during dismantling
Replacing a sewer riser in an apartment involves replacing the pipes of the old system, which can be carried out by dismantling and assembling elements located between the floor and ceiling, as well as their parts located between floors. The first option is the most common, since the second requires the consent of the neighbors.
Before dismantling, the water in the riser is blocked with a warning to the neighbors. At a distance of 80 cm from the tee and 10 cm from the ceiling, the grinder makes cuts in a horizontal plane along half the diameter of the pipe. It is better to insert a chisel into the cuts. They are hit with a hammer, as a result of which the pipe splits, its middle is dismantled. The remaining part under the ceiling is covered with a film and proceed to dismantle the lower part with the help of a nail puller and a crowbar to loosen the fastening of the tee, as well as a perforator for crushing cement at the joints. The old tee is dismantled and pieces of cement are removedchisel and screwdriver. The ends of old pipes are cleaned of dirt and treated with a grinder. The room where the sewer riser in the apartment is being replaced must be actively ventilated.
Preparing for the installation of a new riser
To replace the sewer riser in the apartment with your own hands, you need to have the following items available:
- plastic pipes having a diameter of 110 cm;
- bends with tees;
- elastic bands to prevent leakage at the junction of old and new pipes;
- clamps for fasteners;
- liquid soap to ensure the pipe enters the fittings;
- level vertical-horizontal or vertical.
Installation
Installation when replacing a sewer riser in an apartment is carried out in a certain sequence:
- A rubber cuff is put on over the old pipe and the junction is treated with sealant.
- An additional adapter is inserted into the tee.
- To measure a pipe with an expansion joint inserted into a tee, you must place it in the position in which it will always be. The segment is cut, retreating up to 5 cm above the socket, accurate measurements are taken and the individual parts are connected into a single whole.
- The new plastic riser is attached to the wall with clamps, which will not allow it to move down and break the structure.
- When replacing a tee, the compensator is installed on it. If two pipes are used forriser devices, the compensator is placed in the place of their fixation.
The joint is always treated with sealant.
In closing
Thus, it is not so difficult to replace the sewer riser in the apartment, but any business requires a certain skill. If you are not sure of your abilities, it is better to contact specialists. Before installing a new riser, it is necessary to dismantle the old one, which is, perhaps, a more time-consuming operation compared to installing a new system.
