How to plaster corners: video instruction

Kirill Nesmeyanov

Plastering corners is one of the most difficult stages of finishing. The appearance of the finish coating depends on the correctness of the work performed. In this case, it is important to choose the appropriate tools and smooth the surface. There are a lot of videos posted on the network, how to plaster corners, but masters recommend that you carefully read all the nuances of the finish before watching videos.

Plaster corners

Plastering Rules

Rules for how to plaster the corners of the walls inside and outside the building:

• For facade decoration and in rooms with high humidity, use cement-sand material. Such a product has moisture resistance and resistance to temperature changes. For finishing corners in a dry room, it is recommended to use a gypsum composition. The material is easy to apply and has a long operational period.
• The thickness of the material layer for wall corners is 50 mm. For ceilings - 30 mm.
• Before applying the solution, the surface is treated with an antiseptic solution. This will help prevent mold and mildew under the layer of material.
• After disinfection and degreasing, the base is treated with a primer. The tool will improve the adhesion of the material and surface.
• If there is no experience in plastering, it is recommended to use ready-made compounds. Such funds are used immediately after opening the package. If there is at least minimal experience in finishing work, you can use a dry mixture. The product has a favorable price, but before use, the solution needs to be prepared. Water is poured into a clean container and the material is poured. Product ratios are indicated on the packaging. Next, a mortar is mixed with a construction mixer or drill with a mixer nozzle until a thick sour cream is formed. The product is left for 10 minutes, mixed and used as intended.
• To mix the solution, it is recommended to use only pure water. Another liquid contains impurities, which will negatively affect the quality of the material.
• It is not recommended to knead the solution in large portions, since the finished product must be used within half an hour. After this, the material will harden. If the finish is done by an amateur with his own hands, then he will not have time to quickly spend the solution and the composition will become worthless.
• After plastering, the surface is leveled. Poorly prepared corners worsen the appearance of the finish, which is especially striking if pictures or photographs are hung nearby.

Use of cement material

Foundation preparation

Plastering the corners of the walls, the video below demonstrates this, begins with preparation for decoration:

• clean corners and walls of the old coating;
• cut the protrusions with a grinder or grinder;
• examine the surface for unstable fragments and remove them;
• increase the size of cracks;
• treat defects with a primer and, after drying, fill the imperfections with a solution;
• dismantle metal elements or treat with anti-corrosion agent;
• apply the primer in two layers with a break for drying.

Necessary materials and tools

To plaster corners you will need:

• rule
• level;
• angular and straight spatula;
• trowel;
• construction grater and grater;
• plaster.

Corner spatula for forming corners

Exterior corners

The plastering of external corners is carried out in different ways. It is recommended that you familiarize yourself with all the methods in order to choose the most suitable option.

Finish without perforated corner

If corners for plaster are not used, then the finishing technique will be as follows:

• fix an even board on one side of the corner, while the thickness of the product should be equal to the thickness of the plaster;
• apply the solution and level it with the rule;
• suspend work for two days to dry the material;
• dismantle the board, fix the product on the other side and repeat the manipulation.

Plastering with a corner

Instructions for plastering corners using a countertop:

• apply the solution on an angle on both sides;
• press the plastered corner to the material, swipe the top with a straight trowel to remove excess;
• check the quality of the finish with a level and if any flaws are found, add a solution or vice versa remove excess material;
• apply the plaster again, wait until the agent dries and clean the surface with a construction grater.

If plastering is performed not only on corners, but also on the entire wall, then apply the second layer of mortar immediately to the entire base.

Perforated Corner

Plastering the inner corners

Plastering the corners of the interior is also done in several ways.

Lighthouse decoration

The use of beacons is relevant if the walls are plastered along with the corners. Finishing Algorithm:

• Install guides on both sides of the wall, and then fix the beacons around the perimeter at a distance less than the length of the rule. In the corners, fasten the profiles 5 cm from the joints.
• Fill the gap from the joint to the profile on one side with the solution. Flatten the material by the rule. Perform this manipulation on the other side of the corner and around the perimeter of the wall.
• Form an angle using an angle trowel. Move from top to bottom.
• Pause the finish to dry the material. Then remove the guides. Fill the voids with mortar and level the material.

Plastering the internal corners of the lighthouses

Plastering with profiled corner

How to plaster internal corners with a profiled corner is a frequent question for lovers. In this case, it is recommended to adhere to the following decoration rules:

• Use plaster corners with reinforcing mesh. Measure and cut the desired length of material with scissors for metal.
• Apply a small amount of mortar to the corners. Attach the product to the material, push on it and slide it with a straight spatula. Remove the solution that has leaked through the grid.
• Take a break to dry the product. After that, apply the solution so that the product is completely hidden under a layer of material.

How to get corners for plaster in this case? Do this with a corner spatula. Swipe the tool from top to bottom. Remove excess material with a straight trowel.

Reinforced finish

To align the joints of the walls, it is not necessary to use a plaster angle. Instead, it is recommended to use a sickle:

• apply the solution to the joints of the wall;
• cut the required amount of mesh;
• press the serpentine to the solution and draw with a spatula so that a 90 degree angle is formed at the junction (as in the photo below);
• remove excess solution;
• wait for the composition to dry and apply another layer of plaster;
• with a spatula, form an angle.

Common mistakes when plastering corners

When plastering corners, lovers often make the following mistakes:

• Apply the material without examining the surface for unreliable fragments. This leads to cracks after some time after finishing or collapsing part of the plaster.
• Do not use a primer before applying the solution. Because of this, the material is poorly attached to the surface, and also after hardening, the outlines of the building base itself appear.
• Galvanized corners are cut with a grinder, and not with scissors for metal. Such manipulation leads to damage to the galvanized layer. As a result, the product is corroded, and rust appears through the wallpaper or paint.

Only compliance with all the rules of plastering corners guarantees a positive result and a long operational period of decoration.

The video in this article demonstrates how to plaster corners correctly.