We would like to express our gratitude to the FORUMHOUSE member for his assistance in preparing the material.
Probably, a house with initially smooth and straight walls never existed. One way or another, every homeowner had or still has to level the walls using “heavy plastering” and. Each of these methods has its own advantages and weaknesses, supporters and harsh critics. Based on the experience of users of our portal, we will analyze in which cases it is better to use drywall, in which plaster, and how to do it correctly, and we will tell you about tools that will help determine the degree of curvature.
How to measure the curvature of walls
First of all, it is necessary to determine the degree of unevenness of the walls. For beginners, the so-called “dummies,” the easiest way to measure unevenness is with a laser level, which you can “shoot for a day” from a friend.
Makinsk-KZ Member of FORUMHOUSE
The laser level is installed parallel to the wall, at the most protruding point. The leveling beam draws the lines of the future wall. If you are going to install gypsum boards, then you need to retreat at least 30mm from the most protruding part (bump) of the wall, because guide profile 28mm wide.
The traditional way to measure the curvature of a wall is using a long level (2-2.5 m) - “pass” the level vertically over the entire surface at intervals of about a meter and find the most protruding place. You need to measure the horizontal curvature of the walls with a thread stretched over two self-tapping screws screwed into the wall at different ends of the room. The angle of the thread should be measured using a square.
Makinsk-KZ
You can take a short level, 50-70cm, and tape it to a rule or piece of profile with electrical tape.
How to measure the curvature of walls with a plumb line
Another way to determine the curvature of walls: using a plumb line or a nut tied to a strong thread.
How to determine the curvature of a wall.
A nail is driven in near the ceiling in the corner of the room, which should stick out from the wall by about 3 cm. A plumb line is attached to the nail with a thread of such length that the load does not reach the floor quite a bit. Having stopped swinging, the thread forms a straight line. Another nail is driven into the lower part of the wall so that its head and thread are on the same line.
Such beacon nails, driven in along the entire perimeter of the wall, will give us complete information about the curvature of the wall. By pulling two threads, crosswise, from the upper right corner to the lower left and vice versa, we will make this information almost exhaustive.
Which wall leveling method should I choose?
Gypsum and cement mixtures for leveling walls are traditionally used with a slight deviation, and then plasterboard, but the experience of FORUMHOUSE participants shows that their capabilities are much wider. On our portal the issue was considered from different angles. Each method has both advantages and disadvantages.
Buryat User FORUMHOUSE
What’s not to like about ordinary plaster: one part cement + loosened lime for plasticity + 3 parts sand (relatively speaking)?
The following facts speak in favor of plaster: this method does not eat up the usable area of the room, it is cheaper, with the appropriate skill, the wall can be made smooth, “like the surface of a lake in calm weather,” plaster is a reliable and strong material; It is always possible to repair only part of the wall.
Disadvantages of this method: it is labor intensive and dirty, the plaster takes a long time to dry and slows down further puttying and painting processes, besides, without certain skills you cannot level the wall with plaster yourself, and most importantly:
Buryat
The cost of plastering materials greatly depends on the curvature of the walls.
Therefore, the crude method of leveling surfaces using gypsum or cement plaster is usually used when the walls are not particularly crooked and it is necessary to correct non-catastrophic defects. Otherwise, two problems are possible: too much material consumption (and therefore money) and the danger that an excessively thick layer of plaster will not stay on a vertical surface.
Buryat
With deviations of 2-2.5 cm, you can safely use plaster.
With deviations of up to 4 cm, there is reason to think twice.
If the walls are completely uneven, you can still plaster them - if operational considerations outweigh them.
The average thickness of the plaster layer is calculated depending on the unevenness of the structure.
Palych R34
We will determine the middle layer based on the minimum layer above the “belly” of 3 mm, and then add 3 mm to the thickness of the depressions.
Thus, if the depth of the largest depression is 10 mm, the layer of plaster above it will be 13 mm.
Palych R34
The approximate layer is seen as 8 mm.
You can find out more accurately the size of the middle layer by assessing which areas of the surface are larger: up to 6 mm (shallow) or more than 6 mm (deep). If it is small, we subtract and take the middle layer as 6-7 mm, if it is deep, then we add it, and the size of the middle layer will be 9-10 mm.
Depending on the size of the middle layer, we calculate the need for the mixture, taking into account the consumption of the dry mixture per 1 square meter. m.
The “average layer of plaster” is different from the thickness of the layer you will apply in reality: its thickness will vary throughout the wall.
Buryat
If there is a bulge on the surface, the plaster is reduced in places to 3-4 mm. If, on the contrary, there is a “bulge”, then the thickness of the mantlet increases to 3.5 cm. So walls with deviations of up to 2 cm can be safely covered with plaster and not worry about increasing the thickness of the layer. A particularly healthy bulge can simply be trimmed.
The dry method of leveling walls is carried out mainly using plasterboard sheets, which are either installed on a frame made of metal profiles, or simply glued to the surface. In the first option, centimeters of the house's area are lost, so it is used mainly in large rooms.
Advantages of plasterboard: it can be attached with an adhesive mixture directly to the wall (if it is fairly level), this method does not require complex preparation, and it is much easier for a non-professional to work with plasterboard than with plaster; there is no dirt. Another advantage of drywall: the ability to hide communications under it.
Disadvantages: the living space is “eaten up”. The common belief that plasterboard surfaces are not as durable and may not withstand the load of hanging cabinets, etc., is not true.
Makinsk-KZ
Walls made of gypsum plasterboard can withstand even a water heater, a wall-hung toilet, and even more so kitchen cabinets. It all depends on the correct installation.
And the most annoying minus of this material for FORUMHOUSE members, oddly enough, is the unpleasant sound when tapping.
TOHow to level a wall with plaster
The wet leveling method begins with preparatory work: the walls, if necessary, are cleaned of crumbling traces of the previous finish, and cracks are eliminated. The surface must be primed and dried well. Before starting the main work, it is necessary to protect the floor by covering it with something so as not to spoil it with the solution.
After this, we install beacon profiles.
AMK User FORUMHOUSE
To install the beacons, I used a thin-walled aluminum profile 25x50 mm, 6 m long, cutting pieces 5–10 cm less than the height and width of the walls.
Nowadays, construction stores sell special beacons for plaster.
The beacons are attached to opposite ends of the wall with mortar, checking their vertical position by level. Then they pull a cord between them in three places at equal distances and, guided by it, install the remaining beacons. How many beacons there should be depends on the size of the rule: it must fit between two beacons so as to rest on them.
For plastering residential premises, gypsum mixtures are often chosen for the bathroom, kitchen, etc. – cement-based mortars. But now there are gypsum mixtures suitable for important premises, just as cement-based plaster is used to level surfaces in residential premises.
Regulus User FORUMHOUSE
I would use cement-sand plaster because of the thermophysical properties of the resulting wall sandwich. The thermal conductivity coefficient is very high. The thermal inertia of the wall increases and the dew point does not approach as is the case with drywall with an air cushion.
To prepare such plaster yourself, sand is mixed with cement (usually 6:1, but the proportions can be different 3:1, etc.) and diluted with water to the consistency of sour cream.
It will be quite uncomfortable to live in a house plastered with cement-sand mortar, then cement-lime plaster is preferable. Here is an example of the composition:
Buryat
For 100 cubic meters of solution:
- Construction quicklime lump, grade 1 - 14 tons.
- Portland slag cement for general construction and special purposes, grade 300 - 20.4 tons.
- Sand for construction work for plaster mortars of the finishing layer is natural, very fine - 110 m3.
- Water - 66 m3.
Pour the gypsum plaster into the water and mix it in two stages with a construction mixer or a drill with an attachment: first just until smooth, then repeat kneading after five minutes.
Using a plaster falcon, we throw the mixture between the beacons and smooth it using the h-rule from bottom to top, evenly distributing the plaster over the surface, orienting the thickness of the layer along the beacons (and fill the resulting openings with mortar). A plaster square will help make the corners straight. The leveled surface is dried and primed after the primer has dried.
How to level a surface using drywall
The surface that can be leveled with drywall can be very uneven - an old brick wall. But if the differences on the surface do not exceed 40mm, then special glue can be applied to it
Modern requirements for renovation of premises have become much more stringent. Now, straight walls are an inapplicable attribute of an apartment or house. But even in new buildings it’s impossible to call walls even approximately that way, and even more so in old houses. Therefore, with almost any renovation, leveling the walls is an inevitable stage. How best to do this, about methods and technologies, the possibilities of doing it all with your own hands, and we’ll talk further.
How can I level a wall?
Although technologies in construction are developing rapidly, leveling walls is still done in two ways: plaster and plasterboard. Another thing is that there are different compositions of plaster - based on gypsum and cement, and you can install gypsum boards in two ways: on a frame and with glue. But that's all.
Smooth walls are a modern requirement
For some time, gypsum plasterboard sheets began to be replaced with gypsum fiber boards (GVL). They consisted of a mixture of gypsum and plant fibers, but they turned out to have poor impact resistance and broke even with minor impacts. Therefore, GVL leveling of walls using them is now rare (sometimes they are placed on the floor).
In Soviet times, the walls were lined with plywood. But this is definitely the last century. It is far from the best replacement for gypsum plasterboard, which in 100% of cases gives cracks at the joints, and even swells from humidity. So it turns out that there is nothing to use instead of drywall. So the choice is really not very wide.
Lined with plasterboard
Actually, there is still one way - putty. But it is used only on relatively flat walls with a difference of no more than 5 mm. Therefore, they usually putty on already leveled walls, bringing the plane to the ideal.
If we talk about how easier it is to level the walls with your own hands, then many agree that it is easier to work with drywall. But it’s also not difficult to cope with plaster on beacons. The main thing is to know the technology and not deviate from it.
Leveling walls with plaster
Plaster has two binders: cement-based and gypsum-based. Gypsum dry faster, but the maximum layer that can be applied is about 50 mm. Cement-based plasters can be applied in a layer of up to 10 cm, but they take longer to dry.
Beacon plaster is a reliable way to level walls
In addition to the thickness of the layer, when choosing the type of plaster mixture, it is necessary to take into account which of the finishes will be used later, as well as the conditions of the rooms in which you are going to level the walls. Gypsum is hygroscopic, so it is not used in wet rooms: the bathroom and kitchen must be plastered with a cement-based composition. Rooms and an entrance hall remain for plaster. That's basically what they do.
In our description we will use plaster plaster - Rotband - a popular brand that has good reviews from both amateurs and professionals.
Surface preparation
Removing everything that doesn’t stick well to the wall: beat it off, pick it out, clean it off with a spatula. If there are cracks, we repair them. Then we evaluate the degree of curvature. If there are very large protrusions that stand out too much, it is advisable to remove them (with a hammer and chisel or a hammer drill).
Related article: Quick pizza in a frying pan in 10 minutes
First we clean off everything that falls off
Often when starting to level the walls in an old house, they decide whether to knock down the old plaster if it does not fall off. In principle, the master should evaluate it, but you can try it yourself. Knock the wall. If there are places that differ in sound - they sound duller - then the layer here has moved away from the main wall. If you “hang” another layer of plaster on it, there is a high probability that the whole thing will collapse together. It will be much worse. So it is better to plaster previously plastered walls down to the base material.
If, during preparation, individual potholes that are too large appear, it is better to repair them separately. Putties have a minimum and maximum layer limit. Too much layer may fall off. Therefore, it is better to pre-fill holes or holes.
If the wall surface is too smooth, notches are made on it
When leveling a concrete wall or a surface painted with a film-forming composition, another problem arises: it is too smooth, which is why adhesion to the plaster may be poor. This can be helped by treating a primer such as “Betonokontakt”, which leaves a rough film on the surface, improving adhesion.
Another way out is to make notches. Once upon a time they were made with an axe, now they often use a hammer drill or grinder. With their help, a notch is applied. According to the norm, there should be about 100 notches per square meter.
Primer
Depending on the type of plaster chosen (gypsum or cement), a primer is selected. Its main task is to improve the adhesion of the wall and plaster. Read the instructions for using the primer carefully. Some require the base to be moistened before application, some require dust removal, etc.
Priming walls before plastering
There are two favorites in this group: Cerezit 117 and Betonokontakt. There are others, but these are used more often: good reviews. The composition may be ready for use or require dilution (concentrate). It can be applied with a roller or brush, a spray bottle, or even a garden sprayer to speed up the process.
Until this moment, there were no difficulties in leveling the walls on your own. Everything is elementary. Next - a little more difficult, but also - not to build rockets.
Installation of beacons
If you want to achieve a flat surface, you can level the wall only along the beacons. These are supporting elements that are placed in the same plane. A layer of plaster is then leveled over them. As beacons, you can use special galvanized “T”-shaped beacons or even wooden planks.
It is more convenient to use metal beacons - they are installed faster. But the minimum layer of plaster is about 8-10 mm (6 mm of the lighthouse + the mortar on which it is placed). Another disadvantage is their cost: although not very much money, it is still an additional expense. One more point: galvanized plaster does not “contact” well, so after the initial drying, the beacons are removed from the wall and the holes are sealed.
Installed beacons under plaster on a brick wall
Using wooden slats is a cheaper option, but finding a sufficient number of perfectly even bars in cheap material is problematic (you won’t use high-quality lumber). Even if this is successful, there is still a possibility that the tree will lead from moisture. As a result, the wall will no longer be level.
Related article: DIY table lamp
Some people make lighthouses from mortar. Pre-apply strips of plaster, leveling them. After they harden, they are used as beacons. The cheapest method, but the most labor-intensive, and requiring much more time.
How ideal the alignment of the walls will be depends on how correctly the beacons are positioned. We set it exactly - we got an excellent result. If you make a mistake, you will suffer, correcting the irregularities that you made with your own hands.
Read more about how to install beacons for leveling walls under screed here.
Throwing mortar
The selected plaster is diluted as indicated on the packaging. Then they throw it on the wall. Use a wide spatula or paint bucket. Start from the bottom, cover a piece of the wall with mortar from one lighthouse to another.
Beginning of plastering the wall along the beacons
Then they take the rule and set it below. Leaning on the beacons, pull up, slightly swaying from side to side. Several such passes are made until the solution is leveled. The compound adhering to the rule is removed with a spatula, again throwing it on the wall.
Leveling the putty according to the dots
Again - a portion of the mortar on the wall, leveled with the rule. So all the way to the top. Having tightened one strip, proceed to another. This is how the entire wall is gradually leveled.
The first stage of plastering is completed. But this is only the first. The surface turns out to be imperfect: if you look closely, there are small irregularities. They are leveled with a more liquid solution, achieving a more even surface.
Leveling for putty
When the first layer has dried a little, but has not yet hardened (no later than 2-4 hours after application), leveling for putty begins. Existing imperfections are rubbed down with the same solution, which was diluted a little thinner than required according to the instructions. Since it is more fluid, it is applied with a wide spatula, then stretched along the wall, usually resting on the same beacons.
Leveling walls for putty
So they go through the entire wall again, leveling it to a perfectly flat plane. This is necessary in order to reduce the consumption of expensive putty mixture.
Removing beacons and trimming
When the solution has dried to the state of thick plasticine (press hard with your fingers, it bends), you can remove the beacons. They are pryed at the bottom with a screwdriver and pulled out.
Removing beacons from a plastered wall
They are removed very easily. Actually, the reason they are taken out is that they form heterogeneity in the plaster, and therefore reduce its strength.
Now we take the rule, clean it from the adhering solution and, stretching it in different directions, finally level the surface. This should be done at the initial stage of thickening, when the gypsum plaster is similar to plasticine: cutting it off is usually easy.
Carrying out the rule in different planes, we finally level the wall
When the surface was leveled, diluted with Rotband. They are sealed immediately, without waiting for something: until the plaster has completely hardened, new layers stick to it well.
Sealing traces from beacons
The solution is applied and removed with a spatula. At the same time, make sure that the surface remains level. At this point, leveling the wall for putty can be considered complete.
When leveling walls with plaster in apartments, the problem becomes the angle in which the heating pipe runs. You can't get there with a rule, but you can't get it straight with a spatula. If you are familiar with this problem, watch the following video.