How to groove a bathroom wall for pipes

Modern apartments are equipped with various systems to improve living conditions. This can include gas, ventilation, water supply, sewerage, and also where to go from electricity. Modern people no longer want to see all these pipes and wires, so they try to hide them in the walls. If the electrical cable is small and it is not difficult to disguise it, then for pipes this can be a real challenge. How to groove a wall in the bathroom for pipes is discussed later in the article.

Strobe for water supply

Basic requirements for hidden communications

It should be noted right away that it is strictly prohibited to tap a load-bearing reinforced concrete wall in an apartment building. To be more precise, you can tap a concrete wall, but you cannot cut the reinforcement. Therefore, in stone buildings you can try to circumvent this law. If there are risers in the bathroom, they also cannot be walled up. It is allowed to make boxes and install inspection hatches at the joints.

Pipes laid in the wall must be solid, welded or brazed. If there is a mechanical connection, it must be accessible for inspection. Usually it is enough to install an inspection hatch.

Before you start gating, you need to make sure that there is no electrical wiring. Even if it is located nearby, it should be turned off. Metal, and especially plastic, expands when heated, and this must be taken into account when laying grooves. In addition, metal pipes should be insulated from walls, as they can create noise. Heating pipes are wrapped with heat insulator, this will prevent heat loss.

Conclusion

In general, gating walls for pipes is a fairly simple procedure. However, it also requires adherence to certain technology. In this case, you will save a lot of effort and time, and also avoid mistakes and rework.

From the video in this article you can get additional information about how wall slitting is done with a grinder. If you have any questions, ask them in the comments, and I will be happy to answer you.

July 31, 2016

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Gas pipeline, pipeline, heating system - this is the minimum number of pipes that any apartment has. The arrangement of ventilation and hoods will complete the picture. And the installation of additional plumbing amenities and household appliances in the bathroom and toilet can turn them into an intricate design solution in the loft style.

So the desire to hide communications out of sight is understandable.

Work plan for installing pipelines into walls

This plan is simple and includes several points:

If necessary, you must obtain a work permit.
A plan for the passage of the groove is drawn to scale, and some issues may arise that can be resolved at the project stage.
Lines are drawn on the wall, and it is not the central line that is drawn, but the side lines along which the cut will pass; this will even more clearly show the whole picture of the upcoming work.
The gating itself, the groove modification and the removal of debris are carried out.
Laying thermal insulation, shock absorption and other available means, as well as the necessary connections of all fittings.
Fastening to the wall using clamps, clamps or other means.
Connecting pipes to the system followed by testing.
Sealing grooves, plastering.
Covering with cladding.

Advice. Connect the pipeline to the system only after it is completely installed. Otherwise, the whole house will know about the repairs by thunderous sounds traveling through the pipes.

Advice from professionals

Grilling is rough work, and it is performed according to certain rules. For example, the grooves should be located exclusively vertically or horizontally.
Pipes can only be connected to each other using a monolithic welding technique. If the communications were connected using dismountable fittings, inspection windows should be left.
Even if you are sure that there are no hidden electrical wires in the wall, you should turn off the power to the section of the wall that you plan to work with. The grooves must be larger in width than the pipes themselves and their fastenings. The coefficient of expansion of the material is insignificant for metal communications and polymer pipes reinforced with aluminum.
It is important to prevent the pipes from coming into contact with the groove walls. For this purpose, communications are secured with clamps. This requirement should be taken especially seriously if the system has many bends. Failure to comply with this rule will lead to excessive noise during the operation of the water supply or sewerage system.
It is important to prevent tight contact of the material for finishing the groove with the elbow. The groove must be sealed in such a way that an air gap is formed inside. Filling the space with material is a mistake.
After the channel has been created, and the material inside has been selected, its cavity must be thoroughly cleaned and dust-free.
The start-up of communications is carried out even before decorating the groove in order to check the system for leaks.
Be sure to leave inspection holes, which will be needed if the system needs to be repaired or replaced.
You should not rely on a chisel and a hammer if you have to work with a solid concrete wall in which you need to make grooves of considerable length.

When working with an angle grinder, you should not overdo it and do not put too much pressure on the tool. Otherwise, you may encounter the equipment overheating and failure, and the equipment may become unusable.

Grilling technology using various construction tools

Grooving is the cutting of solid material with an automatic tool. You can, however, do it the old-fashioned way, using a hammer and chisel, but this is time-consuming and labor-intensive, although these tools may also be needed. More modern ones include:

perforator;
grinder;
wall chaser

Let's start with simple tools.

Hammer and chisel

It will be difficult to reach some places, for example, corners, with a grinder or wall chaser, and if you don’t have a hammer drill at hand, then the only salvation is a chisel. For a soft material such as aerated concrete, the steel grade of the chisel does not play a big role, as long as it is well sharpened.

But for hard materials, especially concrete, the steel must be of high quality and hardened. During sharpening, the metal loses its hardening, so it is better not to sharpen the chisel, but to pull it back on an anvil, after preheating it in a crucible. Immediately after pulling, immerse in cold water. The sting should not be made too sharp, because after the first good blow it will crumble.

Chisel for concrete

Attention. You can only work with such a tool wearing protective glasses and gloves.

If it is possible to swing well, then an iron rod is welded to the chisel - a handle 50–60 cm long. Then one holds the chisel by the handle, and the other hits with a sledgehammer - the work progresses significantly. The hardest thing is to get involved. To do this, you can first drill a hole of the required diameter in the farthest corner and then break off pieces from it. The width of the chisel should not be greater than the width of the groove.

Hammer

This device includes a drill and a jackhammer. Has three positions:

drilling;
drilling and chiselling;
hollowing out.

They use the third position and work on the principle of a chisel with a hammer, with the only difference being that the blows occur automatically. It is much faster to work with it, but it is difficult to maintain the depth of the groove and especially its evenness in width. Large pieces often fly off, creating extra work to clean up and repair dents. This is what a small area of scoring with a hammer drill might look like:

Some aesthetics can be given to the groove if you first saw through the walls with a grinder, and then finish the work with a hammer drill.

After cutting the groove like this, it will be smoother

Bulgarian

This is the name of a circular saw, but instead of a dental disc, an abrasive wheel is used. Moreover, these circles are divided according to their composition into working with different materials. When purchasing a disk, you should make sure that it can work with the selected wall. This tool usually develops very high speeds, and the broken parts of the circle can easily cut the human body. For safety, the circles are protected by special covers, which are strictly prohibited from being removed.

Grinder with abrasive wheel

The work is done simply. After assembling and checking it, it turns on, and when maximum speed is reached, and this can be heard from the sound of the engine, the abrasive stone is brought to the line and pressed lightly.

Carefully. When cutting, the disk must rotate smoothly, without distortion, otherwise it may fly apart.

As the wheel wears out, the grinder will need to be brought closer and closer to the wall to get an even cut. Be sure to use gloves and safety glasses. If the diameter of the circle is small, it is better to replace it rather than try to work it out completely.

Polypropylene and its features

It is not without reason that polypropylene, widely known among the people, has gained such popularity. To a greater extent, this is due not to advertising companies, but to the unique characteristics of the material. To decide whether it is possible to embed PP pipes into a wall, it is useful to consider its main physical, chemical and operational parameters:

Polypropylene is resistant and neutral to most aggressive chemicals.
The polypropylene pipe shell has relatively good rigidity and strength, which allows pipes to be laid under the external pressure of building materials.
PP pipes are installed by soldering at a temperature of 260 °C, and due to the mutual diffusion of materials, a strong and durable connection is obtained. The soldered joint is capable of ensuring tightness throughout the entire life of the pipeline.
Due to the properties of the material (thermal conductivity coefficient 0.25 W/m °C) and the thickness of the shell, PP pipe has fairly low heat transfer and is superior to other pipe polymers in this indicator.
The service life of polypropylene in cold water supply networks according to GOST is at least 50 years. In heating and hot water supply lines, the duration of its use depends on the temperature and pressure characteristics of the medium and should not fall below 25 years at a working fluid temperature of no more than 75 ° C (according to SNiP 2.04.01-85).

Rice. 2 Physical characteristics of polypropylene

Since ordinary polypropylene does not have high heat resistance, it is reinforced with fiberglass and aluminum. Thanks to this, the material can be used in hot water supply and heating systems. Reinforced pipes have a lower linear expansion coefficient.
There are several varieties of polypropylene from the 1st to the 4th generation. For the manufacture of the vast majority of pipes, the third development PP-R is used. Recently, the latest 4th generation products made from heat-stabilized polypropylene PP-CT have appeared on the market.
The disadvantages of conventional polypropylene include a high coefficient of thermal expansion (linear elongation), reaching up to 10 mm over a meter area.
The material also has high air permeability, which negatively affects the corrosion resistance of iron-containing compounds.
The disadvantage of polypropylene, inherent in most thermoplastics, is its poor resistance to ultraviolet radiation. Therefore, it is not recommended to lay communications in places with natural light, but placing pipes in the wall is encouraged.

Wall chaser

When working with an angle grinder, you have to go through the same groove twice: once along one edge, the other time in a different way. It is quite difficult to maintain the same distance between cuts, and the groove turns out crooked. The depth of the groove also changes. If you need a wide groove, then knocking it out after cutting the edges is quite difficult; it is much more convenient when there are several cuts. But running with an angle grinder in one place several times is very unproductive.

Wall chaser with vacuum cleaner

A wall chaser was invented specifically for obtaining grooves. Unlike a grinder, one or more circles can be inserted into it, and the distance between the circles is fixed by bushings. With one pass, several cuts are obtained at once, they run strictly parallel. In professional models, the wall chaser is paired with a construction vacuum cleaner, which protects the workplace from dust, creating comfortable conditions for workers. There are two disadvantages - the high price and heavy weight.

Making walls for pipes with your own hands

The general rules for obtaining grooves are quite simple:

We clear the space for the future project, removing all interfering objects.
If there are tiles in the bathroom where future grooves are located, they must be removed.
Exactly according to the plan, we draw lines with a marker where the grooves will go, this will be their center.
Focusing on these central lines, we designate the contours of the grooves, taking into account all tolerances.
Using the available tool, we make a cut along the contour lines to the required depth.
Using a chisel or hammer drill, remove the material from the groove. We also use them to clean up any imperfections.
If necessary, insulation or soundproofing padding is installed.
We install fasteners to hold the pipes.
We lay, connect, secure and wrap the pipes with insulation.
We check that the pipes do not touch the walls anywhere. If this happens, we place a shock-absorbing pad in this place, for example, rubber, mineral wool, foam rubber and the like.
We plaster the channel.
We make inspection windows in places where pipes are mechanically connected. There should be no plaster in this place, and it should be closed with an easily removable lid.
At the final stage, we mask the groove with the same cladding that is located nearby.

Main line laying

Installation of the sewer pipeline is carried out in several stages:

Cutting plastic sewer parts is carried out with a regular hacksaw (for metal) or special scissors.
It is imperative to use a regular file to remove the chamfer at an angle of approximately 15º. A chamfer is required for:
minimizing the risk of damage to the sealing ring when connecting pipes.

When installing a sewer line, cutting and reducing the length of pipeline fittings is strictly prohibited.

Before directly assembling the pipeline, the entire distribution of sewer pipes is laid out on the floor according to the laying diagram. After checking the presence of all fittings and compliance with the required length of all pipe sections, you can begin assembling the products into a single system.

To facilitate the connection of parts, it is necessary to lubricate the elements that will be mated with silicone sealant. Thanks to the use of sealant:
rubber cuffs are retained;
cuffs and pipes are prevented from sticking together.

Due to temperature changes in the length of the pipe, it is necessary to provide a compensating gap in the straight section. To do this, at a straight joint, first push in the connecting parts until they stop, and then push the pipe out 1.0 cm.

Optimal slope

Sewerage is a non-pressure system in which wastewater moves by gravity. Therefore, the installation of sewer pipes in the bathroom, kitchen and other rooms is considered to be done correctly if the required slope of the system is maintained.

Many novice craftsmen make the big mistake of thinking that the greater the slope of the sewer pipe, the better. The fact is that not homogeneous wastewater flows through the pipes. It also contains kitchen waste in the form of grease and other impurities. Therefore, the speed of sewage transport is not the same.

If the slope is too large, water will be effectively removed from the system, and food debris and fats will settle on the insides of the pipes in the form of deposits. If the slope is chosen optimally, then the liquid medium will have time to move solid residues with it.

According to building codes and regulations, the slope (per meter) for products is considered optimal:

up to 50.0 mm in diameter – 3.0 cm;
up to 100.0 mm in diameter – 2.0 cm.

Pipe fastening procedure

Correct and reliable fastening of the pipeline is a very important step when installing a pipeline system. The pipes are fixed along the walls using special clamps. The distance between the clamps is usually chosen equal to 10 pipe diameters. Clamps are divided into:

rigid with rubber seals;
floating (without seal).

Features of laying pipes in grooves

When laying a pipeline in grooves before concreting them, it is necessary:

Set the correct slope of the system.
Provide temperature clearances.
Ensure that the pipes are positioned without bending or internal stress.
Avoid displacement of pipes when concreting them.
Securely seal all gaps with special tape.
Wrap pipes and fittings with any protective material (fiberglass, corrugated cardboard, etc.).

If you adhere to the basic rules for laying sewer pipelines set out in the article, you can independently install an effective sewer system for an apartment or private house in a short time with minimal resources.

Grilling walls for pipes is a necessary part of the work when laying a hidden water supply system. You can camouflage straight sections, monolithically welded and semi-demountable units of all types of pipes in the wall.

Grinding concrete walls in panel houses with a grinder

Once again, it should be recalled that grooves for pipes are quite deep, so it is prohibited to groove load-bearing walls. The partitions are laid according to the previous plan. However, there are also differences.

The edges of the grooves are cut, as usual, at right angles. Then, if the groove is not too wide, the grinder is turned at an angle so that starting from one edge, the cut reaches the bottom of the cut from the other edge. You will get a sawn triangle that will fall out on its own.

Do the same with the other side. Finally, use a chisel or hammer to remove a small area in the middle part of the groove. This method allows you to get smoother grooves and less work with a chisel if there is no hammer drill.

Cutting out furrows

Cutting grooves on the wall for grooves is not difficult, but it is a “dusty” task. For these purposes you can use:

Grinder - working with it may take longer and the level of dust will be higher. This option is perfect for home craftsmen who do repairs “for themselves.” It is very important to purchase a high-quality diamond wheel, otherwise problems with concrete walls may occur.
Wall chaser is a professional tool for wall grooves. It provides a channel that is even in depth and shape, and does not require significant effort on the part of the master. The average cost of a wall chaser on the market is 6,000 rubles, but it can be rented for 500 rubles/day.

Homemade wall chaser

Of all the tools listed, the wall chaser is the most preferred, but also the most expensive. If you have any DIY skills, you can turn an ordinary angle grinder into a wall chaser. To do this, you will need to make an additional attachment on the motor shaft of greater length and place a second disk on it. You can separate them with a washer or bushing. In this case, the load on the device will increase, you will need to ensure that it does not overheat.

Homemade wall chaser

Other craftsmen also attach a fitting and connect a vacuum cleaner to collect dust - why not a wall chaser? One such homemade product can be seen here: