Lime mortar for plaster and its application + Video

Lime plaster - composition, proportions, consumption. The application of plaster can be classified as a type of decoration and leveling work. At the moment, consumers use various materials for this, but most experts prefer compositions, which are also called lime plaster.

This type of composition has been successfully used for decades, and for this reason it is considered a classic finish.

General

Applications

Lime-based plastering materials can be used for the treatment of facade walls and interior premises.

Such coatings are perfect for utility, industrial, residential and even public premises. They can also be used in the plinth, but they are also suitable for closed types of balconies.

There are some limitations to consider when using lime mortar for plaster:

• Lime material is not suitable for you if you want to attach various objects to the base furniture or appliances.
• We do not recommend using lime-based plaster in rooms with high levels of humidity, for example, in the bathroom, basement and other places.

Advantages and disadvantages

The lime composition has a huge number of advantages.

Among the most popular ones that users often note in their reviews, we highlight several main ones:

• Lime is great for any type of base. This plaster can be applied to wood, plasterboard, concrete, brick and other surfaces.
• Water will never accumulate under the coating, as lime solutions are capable of letting in steam.
• This coating is easy to work with as it is elastic.
• The dry material has excellent thermal insulation properties.

  Due to this, you do not have to puzzle over how to additionally insulate the room.

• If the plaster is applied correctly, no cracks will appear on the surface due to mechanical stress.
• Since this material is alkaline, it is resistant to fungi, harmful bacteria and even mold. The protective coating is one of the main advantages.
• Lime plaster does not ignite and does not support flame propagation.

But this type of plaster also has certain disadvantages:

• For the manufacture of such a composition, you must first prepare slaked lime. You can do it yourself, and it will be much cheaper, but this preparation will take you 2 weeks.
• A lot of time is spent on drying such surfaces, and the next layer of plaster can be applied only after the previous layer has completely dried. Thus, the application of a lime-based material can take a long time.

Slaking lime.

Process

In order to make lime and slake it, prepare and obtain the following tools and materials:

• Tool for stirring the plaster mixture.
• Lime.
• Clean and cold water.
• Plastic container (the bucket is the most convenient).

First, place the lime (quicklime) in a plastic container.

Then add liquid to it. Lime must necessarily be covered with moisture, but in a container it should occupy no more than 1/3 of the volume of the plaster in volume. When the liquid and lime combine as a result of a chemical reaction, water will splash, therefore work should be done only with glasses, gloves and heavy clothing. The first stage of blanking will be completed in a few minutes. Next, add a little more water, and then cover the container in which the lime is in and wait about an hour.

After that, add some more water and leave the mixture to infuse for two weeks.

Please note that lime may begin to harden on contact with air (carbonization process), so we recommend placing it in a container that closes tightly.

Options for preparing lime plaster

Although it is possible to buy a lime mortar for plaster, the easiest and cheapest option would be to make it yourself, while doing a few simple steps:

• Take out the sieve and grind the slaked lime through it. Add a little water to get the consistency of the dough.
• Then pour sand into the mixture (lime - 3, sand - 1).

• Mix the composition, let it stand for about 30 minutes, and then stir again.

Gypsum

This type of plaster can be used only for interior wall decoration, as it is not highly resistant to water. Plaster coatings dry very quickly, and the process begins within a few minutes, and after half an hour it completely solidifies. A fully cured coating can be obtained in 2 days. It's pretty pretty, and this helps to do without additional decoration.

Important! The fact is that materials based on gypsum and lime dry quickly, so we recommend not to do too much of the finished mixture at once.

Cook each time in portions, 5 liters is enough:

• Rub the slaked lime and add a little water to it.
• After that, put the resulting mixture into a container and pour gypsum into it (1 liter is enough by volume).
• Mix everything with a special punch or drill. Add water while mixing, but not much.

• Add a couple more liters of slaked lime and water to the container and mix well again. Only after this is the material considered ready for use.

In order for such a coating to dry quickly, you can add a little PVA glue to the composition.For 5 liters of plastering material, 50 ml of glue is enough. You can also add more water, but sometimes this only negatively affects the strength of the coating.

Clay

A little earlier, this type of plaster is often used, but now this phenomenon is less common. The main advantages of such materials are low cost and environmental friendliness. Clay plastering is not the strongest, as the material contains additives such as sand, straw and sawdust. Previously, they also added metal shavings, but now they have stopped using it, since this is a step towards corrosion.

To make lime plaster with added clay, you need:

• Pure cold water.

• Filler (eg sand).
• Alumina.
• Lime dough.

If you managed to extinguish and grind the lime, you can start preparing the clay. Remove another plastic container, place clay in it and add water.

Now you should wait a couple of days and then you can knead the clay with maximum care. Drain off excess water and knead the clay again. The resulting material should be viscous and homogeneous. After that, combine the lime "dough" with the clay mixture. You should also carefully add sand and water, while mixing everything thoroughly.

The mixture should be moderate in fat content. If a lot of solution remains on the tool with which you are mixing the material, you should add some water. If the material does not adhere to the mixer at all, add a little more lime to the container.

Cement

Lime-cement plaster, as a rule, is required for those premises where the level of humidity is high. Such a coating can be decorated using ceramic tiles or special plaster.

Due to the fact that there is cement in the mixture, the coating is strong enough, and lime makes it more plastic. To make a cement mixture, you will need lime "dough", river sand and cement.

The manufacturing process is ridiculously simple:

• Mix river sand and cement.
• To obtain "milk", that is, a liquid solution, the finished lime mixture should be diluted with water.
• Pour the resulting material into a container in which the mixture will be dry.

• Stir the plaster with a drill. If necessary, you can pour in some water.

Usage

Substrate preparation

After the lime has been slaked and all required materials prepared, you can begin to prepare directly for application. All furniture, windows and floor should be removed from the room with plastic wrap, masking tape should be sealed all the places where the walls and ceiling join. After that, all metal elements should be cleaned from the surface, for example, the same screws.

Using a grinder, cut off the reinforcement, and then apply an anti-corrosion agent to its surface.The surface should be sanded, dust off and primed.

Please note that in some cases using a primer alone is not enough, in which case a reinforcing mesh should be used. It is she who will help strengthen the coating.

Now pull the mesh and fix it with self-tapping screws.

If the base is made of wood, it is permissible to use shingles, and with a concrete base, you can use a paint net or a thin chain-link. After that, the walls should be covered with a primer and beacons can be installed. These types of elements will make it possible to make the surface as flat as possible. When installing beacons, you should use the building level more often.

Application Method

The first step is to spray.

Some of the builders skip it, but it is better not to neglect it, since spraying makes it possible to ensure an excellent connection between the surface and the plaster. Ideally, you should use a solution that resembles a jelly in consistency - it should contain a little more water than a regular solution. Next, we collect the mixture on a trowel and throw it onto the surface. After that, stretch the material along the wall, but while you should not try to make the coating perfectly even, leave everything for a day. After that, you can start applying the second layer.

The base coat can be made thick, up to 5 cm. Apply the lime plaster with a trowel and stretch with a trowel. The layer must necessarily correspond to the level where there are beacons. The movement should be carried out from top to bottom. When the treatment of one area of ​​the surface is over, remove the excess plaster using the rule.

Now you can start covering. This requires the same liquid material as spraying. The thickness of the coating should not be more than 0.3 cm. After application, level the layer and wait a couple of hours.

After that, treat the entire surface with a grater, on which there will be coarse sandpaper. At the end, you can switch to fine sandpaper.

If you take into account all the tips that are described in the article, and also do not, like some masters, skip important stages in the work, you will get a high-quality coating, and you will not have to do the finishing. If you want to use tiles or wallpaper afterwards, you can skip the cover.