Wiring of water and sewer pipes in the bathroom

Almost always, the repair in the bathroom involves a complete replacement of all elements of the sewage and water supply system, as well as sanitary equipment. At the same time, the main difficulty lies in the fact that outdated equipment differs in size from modern analogues.

The scheme of collector distribution of pipes in the bathroom

The scheme of collector distribution of pipes in the bathroom.

Therefore, you need to develop a new wiring system, suitable for the selected plumbing. Next, we will consider how the pipes are routed in the bathroom.

Layout diagram

Before you make the installation of pipes in the bathroom with your own hands, you should decide what kind of plumbing devices you plan to use:

  1. Shower and bath - require the presence of cold, hot water and sewage.
  2. Toilet (with a combined bathroom) - cold water and a sewage outlet.
  3. Wash basin - cold, hot water and sink.
  4. Washing machine - cold water and sewerage.

Having determined the required set of sanitary equipment, you need to plan their placement correctly, so that they occupy the minimum amount of free space, and then draw a diagram of the layout of the pipes. Here the main element is the main pipeline, from which all consumers will be connected. Wiring, where water pipes with hot water are marked in red, and blue with cold water.

Scheme of hot and cold water supply

Scheme of hot and cold water supply.

Since most plumbing fixtures require cold, hot water and sewerage, pipe laying involves the installation of 3 main channels. Normally, all pipes are mounted next to each other. If we are talking about an apartment with a central cold and hot water supply, then all the main lines come from about one place (the risers are installed in a special niche). The situation in apartments with individual hot water supply and in private houses looks different. In this case, hot water supply is carried out with the help of water heaters. Here the pipe with hot water will begin at the point of its connection to the water heater.

When creating a wiring diagram, the following should be taken into account:

  • the presence of crossing points is not recommended;
  • The sewage and water supply systems should be placed as close as possible to each other;
  • After installing the plumbing equipment, you should be able to easily connect it to the pipes using flexible hoses;
  • trunk pipes should be located at the bottom of the floor;
  • drainage should be connected to them with the help of tees strictly upwards;
  • The sewage system may not have vertical sections and only a tee to which a flexible hose is connected.

Types of pipes

Piping in the bathroom can be:

  • consistent;
  • collector;
  • mixed.
Layout of internal sewerage

Layout of internal sewerage.

This must be taken into account when designing the wiring diagram. The first type is recommended to use when the bathroom has a small number of points of connection to the water supply. In this case, all equipment is connected to one main pipe using tees. The main advantages of such a connection include compactness, reliability and ease of assembly. However, you need to know that if several devices are turned on at the same time, the pressure in the water supply system will drop sharply.

The collection system is used in apartments where a large number of water consumers are planned to be connected. In this case, collectors are installed in the system for cold and hot water, which do not allow a sharp decrease in pressure in the water supply system, while simultaneously switching on several devices.

The mixed system assumes connection of a part of the sanitary equipment on a sequential scheme, and parts - on a collector system.

Also, the pipe routing is classified by the way of their installation, which can be of an open and closed type. In the first case, the fastening of pipes to the wall is carried out with the help of special fasteners. Hidden installation can be carried out in strobes or behind concealing structures (boxes, screens, etc.).


For laying water pipes you will need the following tools and materials:

The scheme of docking polypropylene pipes for internal sewerage

The scheme of docking polypropylene pipes for internal sewerage.

  • apparatus for soldering polypropylene;
  • metal cutter;
  • perforator;
  • roulette;
  • marker;
  • pipes;
  • collector;
  • gates and valves;
  • fitting;
  • fasteners.

Regardless of the type of wiring selected, installation work begins with the installation of a check valve at the inlet of the water pipe. After that, the water meter is installed (if available). If the selected system assumes the presence of a collector, then its installation is carried out. Collectors can have from 2 to 4 outputs. If there is a need, then it is possible to combine several reservoirs into a single system. A shut-off valve is installed for each collector outlet. If a serial wiring diagram is used, tees are installed to connect the plumbing fixtures.

Then you need to cut the pipes according to the scheme. It should be borne in mind that a part of the pipe will be inserted into the fitting. Therefore, to the desired length of the pipe, you need to add the depth of its entrance to the fitting. At the last stage, the polypropylene pipes are brazed and fixed to the wall in an open or closed manner.


The first thing to do is to dismantle the old sewer system, after which you can start installing a new one. The most time-consuming and responsible work is the replacement of the riser, therefore it is recommended to start the wiring from this place. Cast iron product is changed to a modern plastic pipe of the appropriate diameter. To start the installation of the riser, you need to connect the crosspiece or tee: a rubber cuff with a sealant is placed in the lower bell and the tee is fixed in it.

Replacement of sewer pipes is carried from the bottom up.

In this case, all the funnels are placed along the water flow. New pipes are attached to the wall using special clamps. In order to avoid blockages, all pipes should be placed under a slope to a riser of 20 mm per 1 m.

After the installation of the water supply and sewerage is over, a trial run of water is made, in which all joints are carefully checked for leaks. If the leak is not detected, then the installation work is done qualitatively.

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