How to level an uneven concrete floor. Do-it-yourself concrete floor leveling

Leveling a concrete floor without the help of hired specialists is not such a difficult matter if you approach it "armed" with certain knowledge. Let's figure out how you can perform this process yourself.

Why is floor leveling required?

Today, concrete flooring can be seen in commercial premises, industrial facilities, and living rooms. It has a lot of useful characteristics, but it is possible to use them only when the concrete bases are qualitatively leveled. The most common defects in concrete floors are:

• shallow "waves" called chills that appear after the rule;
• smooth repetitive changes in the level of the floor - wave drops;
• raising (local) floor level - influxes.

With prolonged use of poorly equipped concrete bases, cracks often form on them, as well as cavities and lenses - lowering (local) floor level. Sometimes protruding pieces of crushed stone filler appear on its surface, which indicate the destruction of the coating. All voiced defects lead to unevenness on the floor, which can cause injury to a person, the impossibility of reliable installation of equipment used in everyday life and in the kitchen, furniture.

And from an aesthetic point of view, uneven flooring, you see, does not add beauty to the room. To avoid these inconveniences, competent leveling of the floor with your own hands is required. Such a procedure, carried out qualitatively, in addition, will achieve a high level of noise, hydro and thermal insulation of the floor covering. The leveling of the concrete base is carried out by arranging the screed, which can be done wet or dry.

In the first case, it is mandatory to use a special leveling compound with the addition of water. With the dry method, dry mixtures are used. The choice of the optimal technology for each specific case is based on the condition of the initial floor covering and the height differences available on the floor of the room. Usually, cement-sand compositions, “dry” compositions and self-leveling mixtures are used for screeding. We will talk about them further.

Cement-sand composition - a classic leveling

Sand and cement screed is considered a classic and very effective way to give floors the desired “evenness”. It is recommended for rooms where the level difference of the concrete base is five or more centimeters. The cement-sand screed technology is characterized by certain difficulties and high labor intensity of the process.

But on the other hand, you can do it yourself in any living space - in the bedroom, corridor, in the kitchen, and be sure of the strength and excellent reliability of the resulting coating. It is only important to remember that the thickness of the prepared mixture must be at least three centimeters. With a smaller thickness, the strength indicators of the completed screed will be unsatisfactory. We will tell you how to level a concrete floor with a mixture of sand, cement and water.

First you need to remove all dirt and accumulated dust from it, wipe off stains from oil solutions that were used in construction or repair work. Then a waterproofing material is laid on the floor - it can be anything. At this stage, it is important to glue the joints of the waterproofing well, and leave allowances near the walls. Further, with the help of the level, beacons are installed. For their installation, metal profiles are used, fixed to the floor by means of gypsum hardening solutions.

Between the guides of the performed "frame" the distance is taken up to one meter, no more. At a greater distance, pouring the mixture and leveling it will be difficult. The sand-cement mixture is prepared from M-300 cement, ordinary sand and water. Now no one makes such a solution on their own. It is much more convenient to buy dry ready-made mixtures and add water to them in the proportions recommended by the material manufacturer.

It is necessary to stir the composition very carefully. It is best to do this with a construction mixer. The finished solution should not spread, but at the same time on a flat base it should be slightly blurred. Please note - the mixture is applied after stirring for 60-90 minutes (otherwise it will simply harden). And you need to cook it immediately for the entire area of ​​\u200b\u200bthe room.

Pouring a cement-sand screed - we work carefully

The prepared solution begins to be poured from the far corner of the room between the beacons. It is necessary to immediately level the composition after applying each individual portion of it, using the rule. Move it towards you, not away from you. Also, the rule should be to “scatter” the mixture on the sides (some level it exclusively along the guides, which is wrong) in order to achieve a good compaction of the screed layer and fill the existing voids.

Professionals also advise piercing the applied composition with a metal bar of small diameter. Such a simple action will avoid the risk of air voids in the screed. If the mixture of sand and cement is made of great thickness, it is advisable to strengthen the screed with reinforcement from a convenient (at hand) material. In addition, it is recommended to cut special seams in it (they are called shrinkage) every 250–300 cm. Long breaks when laying the cement-sand composition should be avoided.

If you hesitate, "cold seams" are guaranteed to appear on the surface. They will significantly reduce the strength characteristics of the finished layer. For this reason, do-it-yourself floor leveling should be done not alone, but with an assistant. After laying the entire cement-sand mortar, it is left for 24 hours, and then thoroughly moistened with a spray gun or a paint roller. After 48-60 hours, you will need to check how well she grabbed.

After that, the screed is moistened again and a plastic film is placed on it. It protects the floor from rapid drying, which is fraught with the appearance of cracks. Over the next 7-8 days, once a day, it is required to moisten the screed with water. And then the film is removed and the floor is left to dry in natural conditions for another 1-2 weeks. On the completed screed in the kitchen or in another room, you can safely lay the floor covering that you have chosen. But first, make sure that the screed is of high quality.

If everything has been done correctly, the floor surface has a uniform gray color, and when tapped with a block of wood, it makes the same sound in all parts of the room. We hope that we have explained clearly enough how to level a concrete floor using a wet mixture of sand and cement. This technique can be used in all areas of housing, including the kitchen and even on the street (on open verandas, terraces). We add that the finished surface can be further polished. It makes no sense to carry out such a procedure if the coating was done on the street. But for living rooms, it will not be superfluous.

Grinding is carried out with a special unit (machine), which quickly and efficiently smooths out all minor irregularities.

Dry screed - how to level the floors without water?

Do-it-yourself “cleaner” leveling of the floor is carried out using mixtures consisting of granulate, quartz sand, expanded clay or expanded polystyrene, and fiberboard, chipboard, moisture-resistant gypsum-fiber sheet materials or ordinary plywood. Such a screed additionally soundproofs and insulates the room, so it is used in the kitchen or hall in the apartments of high-rise buildings. It is not difficult to independently make such an alignment even for a person very far from building wisdom.

Advantages of dry screed:

• fast execution of work and the possibility of laying the selected floor covering immediately after the completion of leveling operations;
• no need to use water to mix the solution;
• installation of utilities inside the screed is allowed;
• work can be done without assistants, performing them gradually on small areas of the room.

In addition, a dry screed makes it possible not to worry about the need for additional arrangement of sound and heat insulation systems for the floor.

The scheme for leveling a concrete floor using this technology is as follows:

• the base is thoroughly cleaned;
• a waterproofing material is laid - a 50-micron polyethylene film (before that, it is desirable to prime the surface);
• scatter the dry mixture over the film and evenly distribute it;
• lay plywood, sheets of gypsum fiber or chipboard, fastening them together with glue and self-tapping screws;
• the resulting screed is primed and the excess film is removed (its protruding parts are cut off).

The work is done fairly quickly. You may only have a problem with the fact that it is forbidden to move sheets over a layer of dry leveling material. So, it is required to put them on the planned place from the first time.

Self-leveling floors - an affordable and convenient leveling method

If in your kitchen or in another room the difference in floor levels is relatively small - up to three centimeters, it is recommended to level them with special mixtures that themselves diverge over the surface. Such compositions are very popular these days. They are made on the basis of cement, to which modifier additives are added that increase the fluidity of the solution.

Such self-leveling coatings cannot be used "naked" - without laying ceramic tiles, PVC materials, linoleum, cork or carpet on them. If you decide to use, for example, in the kitchen, be sure to finish them with the indicated materials. Otherwise, they will actively absorb oils and various liquids.

How to level the floor with your own hands using a self-levelling compound? Quite easy. Stick to this pattern:

• prepare the base - remove dirt from it, vacuum, close up even the smallest holes and cracks;
• clean the surface with a primer (special primer composition);
• prepare a small portion of the mixture according to the manufacturer's instructions (it becomes unusable after 15–20 minutes);
• Apply the self-levelling mortar in strips 30-50 cm wide on the floor and spread it with a spatula.

Now just wait until the mixture is completely dry (6 to 24 hours).

From the author: hello dear reader! Many of us have long dreamed of repair, but do not dare to get down to business because of its high cost. But do not despair, all the work can be done with your own hands, practically without using a special tool. And if one is needed, then it can be freely taken for several hours from neighbors or work colleagues.

From this article you will learn how to level the concrete floor with your own hands in a short time without attracting a lot of money. We will share with you the secrets of real professionals, as well as warn you against making critical mistakes that can lead not only to repeated repairs, but also to repairs at your downstairs neighbors.

Why is this “alignment” necessary?

This operation is an integral part of any small repair. Unless, of course, you want to see wavy linoleum in your house or re-lay the laminate every year. This is done so that the finish coat lays down correctly and does not cause any problems for many years.

During the construction of some houses, no one thought about the evenness of the floors or walls - "done, holding on, well, okay." Modern life implies the availability of comfortable housing and its compliance with certain standards. To fit your home to these standards, you should start leveling, and only after that move on to the rest of the components.

What can be done to level a concrete floor? In practice, the following types of alignment are used:

• cement screed with reinforcement;
• cement screed with reinforcement with basalt fibers;
• logs with plywood, chipboard or boards;
• Self-leveling floors.

If you ask yourself which method to choose, then it is difficult to answer it unambiguously. It all depends on the specific situation and the goals you want to achieve. Below we will determine which option is suitable and for what.

Concrete screeds

Leveling cement screed with reinforcement- a simple and reliable method, is, so to speak, "grandfather" and has proven itself well for many decades. In terms of strength and reliability, it is not inferior to any other method, even despite the emergence of a huge number of new materials.

This coating is financially inexpensive and very easy to use. For its manufacture, only sand, cement, fittings and lighthouses are used. The average room usually takes no more than five bags of cement and fifteen bags of sand, this is if we make a "specific" five-centimeter base. It is possible to reduce the consumption of the solution by using but (broken brick, stones, crushed stone).

Great for a concrete floor in a garage. It will differ from the apartment method only in that it requires a coating of not 5 cm, as in apartments, but 7–10 cm in order to withstand the weight of heavy equipment. Although this method is the cheapest, it is not inferior in quality to all the others.

Screed with basalt fibers- this is the best way to level in an apartment or other place where a heavy-duty screed with excellent properties is required. Basalt fiber is an innovative material that gives cement simply breathtaking physical properties:

• in comparison with the use of reinforcement, the resistance to rupture is doubled, the possibility of cracking is excluded;
• the ability to compress and stretch is increased by forty percent;
• increases its fire resistance and frost resistance.

In general, you get a coupler for the ages. At the same time, the consumption of basalt fiber is extremely insignificant, only 1% by weight of cement. When kneading, for example, a solution of one to three, that is, one bag of cement and three bags of sand, you need to add only 0.5 kg of fiber. Perhaps the most reliable way is to align with beacons:

Self-leveling floors- one of the varieties of screed. It is distinguished by its simplicity and ease of use, does not require a layer of 5 cm and the installation of beacons. It is carried out with self-leveling mixtures, which, when solidified, turn into a solid and even base. The disadvantages of this technology is that it cannot be used if the difference in unevenness is more than 20 mm, the leveling range is from 5 to 20 mm. This option is the best for an apartment, especially if you do not have special skills in the construction industry.

Source: http://kuhnyamoya.ru

In this case, you need to do just a few simple steps:

1. We clean the old surface, remove and get rid of dust.
2. Treat with a deep penetration primer.
3. We perform waterproofing with roofing felt or bulk mixtures.
4. We lay out the reinforcing cage, lifting it 2–2.5 cm from the waterproofing. If we use basalt fiber, reinforcement is not required.
5. We expose the beacons on the strips of mortar with the addition of alabaster, using a hydraulic level.
6. Pour the solution, pull the screed along the beacons.
7. Wet thoroughly twice, every 4 hours. Cover with film.
8. After 4 days, remove the film and leave to dry for 20–25 days.

All the methods described above are great for leveling the floor under linoleum or laminate.

Lag Alignment

If we need to lay a warmer analogue of a concrete screed, or even insulate the floor, then this method is perfect. From any concrete coating will always breathe coolness, due to its poor capacitive properties to retain heat. But there is always a way!

Alignment with lags gives us the opportunity to get an air gap between the concrete base and the finish coating, which will create the effect of a thermos. And if you fill this layer with some kind of insulation, then the heat loss of the house will be minimized.

A flat floor is the basis of a quality repair and will allow the owner to fully experience the comfort of a house or apartment. This reduces the risk of bumps and injury. Therefore, in order for all further repairs to be perfect, you need to know how to level the concrete floor. This task is quite difficult, but if everything is done correctly, it is quite real.

Preparatory work

Before you level the cement floor, you need to properly prepare for work and carry out several important activities. They will help to significantly reduce the time spent and save the master from additional difficulties.

Before leveling concrete floors, it is necessary to correctly select the required materials and tools. It is on their quality that the attractiveness, as well as the convenience of the floor, will depend. Another important factor in the success of the alignment process is the strict observance of all stages of work and taking into account the advice of professionals. They will help beginners not only avoid most mistakes, but also get the job done in the shortest possible time.

Professionals advise the following:

Choice of materials and tools

As a rule, a tool that is easily found in the household is used to level the concrete screed. You can also borrow it from neighbors, acquaintances or rent it in special services.

To quickly and efficiently complete the task, you will need:

• building level;
• putty knife;
• perforated corners (to be used as beacons);
• a bucket or deep bowl for mixing cement mortar;
• construction mixer or electric drill.

If the surface is not new, then it is necessary to clean and dust it. In the latter case, you will need a construction vacuum cleaner. It will help to remove the smallest dust and better prepare the surface.

One of the most important stages of preparation is the choice of a mixture for leveling the floor or making it yourself. The second option is less preferable, since during the mixing process one of the components can be missed or used in larger quantities. From this, the properties of the mixture will change dramatically, which can lead to poor quality of the work performed.

To level the floors in ordinary apartments, you need to use cement-based mixtures. If the room being repaired has a constantly high level of humidity, then it is best to use a gypsum-based solution. It is moisture resistant and is not afraid of sudden drops.

Alignment methods

Before leveling the concrete screed, it is necessary to choose the most suitable method for the room. It depends on many factors such as temperature, humidity and type of room.

There are three main ways to level the floor, which are often used in the repair of premises. Among them are:

1. With the help of cement-sand composition.
2. With the use of dry compositions.
3. The use of self-levelling compounds.

Cement-sand composition

This version of the screed is considered universal and most commonly used. He gained his popularity due to the cheapness and availability of the materials used, which can be easily found in any hardware store. Leveling with a cement-sand composition is a rather time-consuming and lengthy task. However, to carry out such work, you can not invite specialists, but cope on your own.

This method allows to achieve high strength and reliability of the coating. It should be borne in mind that the mixture can be laid out in a layer with a thickness of at least 3 cm. Otherwise, the screed will not be reliable and may collapse.

Work order:

Dry screed

This method of leveling the floor is done using mixtures consisting of quartz sand, granulate, polystyrene foam, expanded clay. Any moisture-resistant material, plywood, chipboard, fiberboard can be used as the main material. The finished screed not only levels the floor, but also additionally insulates and also soundproofs the room. Because of these properties, it is often used to repair apartments in a multi-storey building.

This work is quite simple and even a beginner can easily cope with it. Among the positive aspects of dry screed, it is worth noting the following:

1. Small amount of time spent on work.
2. The possibility of laying the coating immediately after the end of the leveling process.
3. If necessary, you can lay wiring or pipes inside the screed.
4. To prepare the solution, you do not need to use a liquid.
5. Ability to work alone.

A large number of advantages makes this floor leveling method one of the most popular. Professionals advise dividing the entire surface into separate squares and doing the work gradually.

The process of performing such an alignment is simple and consists of the following steps:

During operation, some unforeseen problems may occur. The most common situation is when the master needs to move a sheet of material to another place. However, such actions are not recommended, as it is possible to disturb the uniformity of the leveling layer and get a curved floor. In such cases, only a return to the initial stage of work can correct the situation.

Self leveling compound

In modern construction, special solutions are used to level the floor, which independently spread over the surface and are evenly distributed over it. Such mixtures are made on the basis of cement with the addition of modifiers that contribute to a more fluid consistency.

After such alignment, it is imperative to lay linoleum, carpet or tile on the floor. If this is not done, then the surface of the mixture will absorb various liquids, which will lead to the rapid destruction of the coating.

Floor leveling is done as follows:

Leveling a concrete floor is a rather difficult and energy-intensive task. In some cases, it may take more than one week. With the right approach to business and following all the recommendations of professionals, you can significantly simplify the whole process and complete it as soon as possible. To carry out the task independently under the power of each owner.

At present, in almost all buildings, regardless of their purpose, casting with a monolithic metal mesh is used as a base for finishing flooring. However, after the screed has hardened, irregularities in the form of waves, sagging, shells or protruding particles almost always remain on the surface of monolithic concrete. Therefore, the building owner often faces the question: how to level the concrete floor for tiles, laying laminate or other fine flooring.

Leveling the concrete screed

In order to get an idea of ​​how to work with concrete, this article will take a detailed look at how you can level a concrete floor and suggest the most common ways to do this job.

In addition, detailed instructions on the use of various alignment technologies and processing methods will be presented here.

Dry screed

This method is the simplest, does not require the use of special equipment and large labor costs, therefore it has become widespread when arranging a finished floor with your own hands in residential and commercial premises.

This technology completely eliminates the use of water in the process of work, so it is often used in cases of finishing floors made of laminate and other wood-fiber materials.

1. After complete hardening and drying, the surface of the monolithic slab should be thoroughly cleaned from construction debris and dust.
2. Lay waterproofing from a thick construction polyethylene film on the prepared slab, wrapping its edges on the walls to a height of at least 100 mm.
3. If necessary, under the waterproofing it is necessary to lay electrical or plumbing communications. For the passage of walls and interfloor ceilings, diamond drilling of holes in concrete can be used using special tools.
4. Spread a dry granular leveling compound over the entire surface of the floor and spread it evenly in a layer 50-80 mm thick.
5. Check the level with a long building level and tamp with a hand rammer or vibrating plate.

After compacting the granular cushion, a substrate is laid on the surface, on which the finished floor covering is mounted.

Note! The positive features of this method can also include good thermal insulation, which is provided by the porous structure of the components of the dry granular mixture.

Cement-sand mortar

This method is classic and, due to the high strength of the finished coating, can be used both in residential and commercial or industrial premises.

1. Before performing work, clean the surface of construction debris and dust, and then cover with one layer of a penetrating primer.
2. Using a gypsum mortar on a laser or water level, fix the rails-beacons with a distance between them of at least 1000 mm and leave until the fixing solution has completely dried.
3. Prepare a cement-sand mortar in a ratio of 1: 3 of a not very thick consistency and start pouring from the corner farthest from the entrance.

1. Pour the solution into the space between the two beacons and, moving the rule along the beacons, evenly distribute it throughout the area.
2. Thus, step by step, you need to fill the entire floor area. If possible, one room should be leveled in one working day.

After the mortar has hardened to such an extent that it is possible to stand on it, all beacons must be carefully removed from the finished floor, and the gaps formed should be rubbed with fresh mortar.

Due to the low cost of materials and work, this method has the most favorable price / quality ratio.

Advice! To prevent cracking of the leveling screed after pouring, it is recommended to cover the floor surface with plastic wrap and moisten it periodically for one week.

Self-leveling compounds

The composition for leveling the floor is a dry, finely dispersed mixture of binder and filler, which must be diluted with water immediately before use and thoroughly mixed using a construction mixer or a nozzle on an electric drill.

The finished mixture spreads over the floor in a thin layer, and after drying, it forms a smooth, uniform high-quality surface, suitable for arranging a finished floor using all types of household floor coverings.

1. This method is suitable for a relatively flat floor, so if there are significant irregularities, they must be eliminated in advance. To remove protrusions or sags, cutting of reinforced concrete with diamond wheels can be used, and deep depressions and cracks must be rubbed with a cement-sand mortar.
2. Carefully remove all dust and debris, then impregnate the surface with a penetrating primer.
3. In a clean container, dilute the required amount of the dry mixture in strict accordance with the instructions on the package.
4. Spread the finished solution over the entire area of ​​​​the floor and let it spread on its own over the entire surface, then leave it to solidify completely.

After pouring, such a coating hardens within half an hour, however, any work in the room can be carried out no earlier than after 3 days.

Advice! This preparation of the floor is only suitable for the subsequent laying of the final floor. The hardened surface must not be painted or used as an independent finishing floor.

Conclusion

After reading this article, it becomes clear how to level the concrete floor in a garage or any other room in your own household using the simplest technologies and inexpensive building materials. For more information on this issue, you can watch the video in this article or read similar materials on our website.

In the event of a major renovation or complete replacement of the old flooring, you will need to level the concrete floor. This will enable high-quality installation of a new finishing material.

I must say that you can carry out this procedure in the apartment with your own hands. There are several ways:

1. By . This method is suitable for pouring concrete or cement-sand mixture. In this case, metal rails are used, for the installation of which a building level is required. This method is optimal in an apartment with large rooms. This alignment has a certain advantage: the floor surface is durable and perfectly flat. However, for complete drying of the screed, you will need at least 2 weeks, and this will significantly delay the repair time. This method of correcting irregularities is also suitable if you want to lay linoleum or laminate.
2. With help . Such leveling of the concrete base in the apartment is carried out using a special self-levelling mixture, which easily spreads over the entire area, forming a flat and smooth surface. The advantage of the method is the ability to make the base with your own hands, a small layer thickness. However, if the horizontal differences in the concrete floor are too large, then this method will not work.
3. Building. This method involves the use of wooden logs, which are set under a certain level. It is fixed on top of them, which creates a perfectly flat surface. This leveling of the concrete floor is best used in private homes, in an apartment on the ground floor. It enables additional insulation of the room, as well as hidden laying of communications and engineering systems. However, you should not use it in rooms with low ceilings, as it takes up some of the usable space.
4. With tile adhesive. This is an individual method and can only be applied if you use tiles for decoration.
5. With dry screed. Such leveling of the concrete floor is carried out using expanded polystyrene, dry quartz sand or expanded clay. Further, sheets of plywood or chipboard are laid on this material.

Features of the preparation of the base

Before leveling the concrete floor, it is necessary to prepare it for work. First, remove the old flooring and carefully evaluate the surface. Determine how uneven the floor is by using a long spirit level. Naturally, in the process of work, you need to note two points: the lowest and the highest.

After correcting all the shortcomings, try to clean the floor of dust and debris. Be sure to treat the surface with a primer. This will ensure maximum adhesion to the mortar to be leveled. You can do all this work with your own hands.

Alignment technology

By lighthouses

So, in a large apartment, this method is very popular. The whole process consists of the following steps:

• Cleaning and treatment of the base surface with a primer;
• Laying beacons (perforated metal profiles) over all areas of the room. In this case, the installation step is 30 cm. Please note that the last beacon should be at the same distance from the wall. The elements are fixed with gypsum or cement mortar. Heaps of the mixture are applied to the concrete floor and beacons are laid on them. After leveling them, it is necessary to allow the solution to dry;
• Applying mortar to uneven ground. The mixture is poured in parts. Start the pouring process from the far corner. To align the screed, the rule applies;
• Floor covering. Before this, the solution must dry well. This may take from several weeks to a month. It should dry naturally, however, if necessary, a heater can be used to speed up the process. After that, it needs to be further sanded and dust removed. Next, you can proceed with the installation of the flooring.

Arrangement of a self-leveling floor

Now you will learn how to level a concrete floor. In an apartment, this method is also very popular, as it makes it possible to use such flooring as a laminate. At the same time, the mixture dries quickly enough, which reduces the repair time.

It is easy to do all the manipulations with your own hands. You just need to follow the sequence of work:

1. Surface cleaning and priming.
2. Dilution of the product in compliance with the proportions indicated on the package. Please note that the consistency of the mixture must be such that it can spread freely over the surface of the concrete floor.
3. Elimination of air bubbles with a special roller. Its needles should be slightly larger than the thickness of the layer.

Thus, an uneven floor becomes an ideal surface on which to lay a laminate or other floor covering. This alignment is very fast. The base is of good quality.

Wooden floor extension

In the apartment, which is located on the ground floor, this is the best option, which, in addition to leveling, will allow you to hide communications and organize a warm floor. The work involves the following manipulations:

• Elimination of cracks or other damage in the base, priming the surface of the concrete floor;
• Laying vapor barrier material. Please note that here we must not forget about allowances for adjacent canvases and walls. Sheets of film are fixed to each other with a special adhesive tape;
• Lag installation. With your hands you will do it quickly. They are attached with anchors. At the same time, constantly monitor the level of the horizontal plane. If there is a gap between the wooden element and the concrete base, then you can eliminate it by placing a plastic or wooden wedge (do not forget to fix it with a self-tapping screw);
• Insulation lining. This is especially important in an apartment under which there is an unheated basement;
• Installation of plywood or wooden boards. These materials are fixed with self-tapping screws. This is the final stage of alignment.

Now you know how to level a concrete floor. As you can see, doing all the work with your own hands is not so difficult. Follow the alignment technique. But if you are sure that you cannot cope with the work yourself, you can always use the services of a master.