How to plaster the internal and external angles of the walls: methods of aligning joints

Putting in plaster at the internal and external corners of walls is an essential step in finishing any space with a polished appearance. Whether you’re building a new project or remodeling your house, learning this technique can greatly improve the way your walls look overall. Accurately aligned joints guarantee the longevity of your plasterwork in addition to improving its aesthetic appeal.

A few crucial steps in the procedure aid in producing neat, sharp corners. Internal angles, or the meeting point of two walls within a room, can be challenging because they need to be precise to prevent uneven surfaces and cracks. Conversely, external angles are the corners that face the outside and must be strong and straight to resist deterioration.

You can achieve smooth joints that blend in seamlessly with the rest of the wall by using the appropriate tools and techniques. Using corner beads, plastering a surface several times, and carefully sanding the finished surface are standard procedures. Whether you’re a professional or a do-it-yourself enthusiast, knowing these techniques will give you the confidence to take on plastering projects.

We’ll walk you through the process of aligning joints at internal and external angles step-by-step in this article. We’ll go over everything, from surface preparation to finishing touches, to make sure you have the skills necessary to produce faultless plasterwork in any setting.

Method Description
Internal Angles For internal angles, apply joint compound to the joint using a putty knife, then embed paper tape into the compound. Smooth it out and let it dry. Apply additional coats if needed, sanding between coats for a smooth finish.
External Angles For external angles, use metal corner bead to reinforce the joint. Apply joint compound over the bead, ensuring it"s evenly covered. Feather the edges for a seamless transition. Allow it to dry completely before sanding and applying further coats if necessary.

Rules for plastering

Plastering tasks within the premises are typically completed by hand. You can buy a prepackaged construction mixture or independently create a solution from separate ingredients for this purpose. The most common types of plasters are mineral-based ones made of cement, sand, gypsum, lime, and clay. Using cement solutions makes sense when it comes to decorating high-humidity areas or facades. Gypsum plasters are permitted in areas with dry air and no direct walls that are near water.

To ensure proper plastering of the corners and a high-quality outcome, follow these guidelines and suggestions:

  • In the absence of experience in plaster business, use plastic compositions of factory production, implemented in already divorced form;
  • Before applying the plaster, do not forget about priming to improve adhesion of materials (this applies to all types of surfaces);
  • In addition to the primer, use antiseptic solutions to prevent the reproduction of mold under the finish;
  • not exceed the maximum permissible thickness of the plaster layer (on the walls of 50 mm, on the ceilings of 30 mm);
  • When breeding a dry construction mixture, use only clean cold water, and fill the powder into the liquid, and not vice versa;
  • prepare a solution that resembles thick sour cream by consistency – it is most conveniently applied on the surface;
  • Do not knead large portions of plaster, because it has the ability to harden quickly and become unusable;
  • After applying the solution, immediately levils it, without waiting, especially when it comes to a gypsum mixture;
  • Give each layer to gain a well on the basis;
  • Do not work at temperatures below +5 degrees and above +35 degrees;
  • After plastering, proceed to painting or gluing wallpaper only after 2 weeks, so that the composition will gain strength.

Marking

You must mark the walls beforehand in order to remove the corners uniformly. The following actions can be taken with the ready tools (rule, plumb, square, and level) to receive joints at 90 degrees:

  1. A plumb or rule with a level measure the angle for verticality, and adjacent walls for collapse.
  2. They identify all defects and features of the position of the walls, draw the junction of the junction of the joint line, extending them using the rule (marking is performed on the ceiling or on the floor, depending on which angle is straightened – upper or lower).
  3. Using a plumb line, transfer the lines and the top of the drawn figure to the opposite end (on the floor or on the ceiling, respectively).
  4. Lights are placed on the lower and upper marks.
  5. If possible, perform all the work using a laser level (level), which forms clear lines with perfectly verified angles.

The joints between neighboring walls are typically plastered at the very end, following the drying of the black construction mixture. You can’t mark the inner corners in this case; all you have to do is smooth up one side, then the other, resting the rule in the first direction.

Preparation of the base

Plastering walls and angles is a difficult task. Starting work should involve taking precautions. This is what they have listed:

  1. Old coating. Remove the falling pieces of plaster and putty up to concrete or other base material. All protruding areas are tapped, bite off with a chisel. Durable ledges are cut off with a grinder or grinding machine.
  2. Cracks. The size of the existing cracks is increased to close them with putty. A reinforcing mesh is applied to the layer of the applied material, it is dumped on top of an unfinished mass.
  3. Deepening and defects. All such areas are filled with gypsum or cement mortar, thoroughly leveled.
  4. Metal elements. Fasten parts, hats and old corners are treated with an anti -corrosion and covered with a thin layer of solution. If possible, excess elements dismantle.

After finishing the preparatory work, 1-2 layers of high-quality primer are applied to the base to increase the adhesion of the plaster composition.

Necessary materials and tools

The same tools—a level, rule, and corner—as well as the following must be ready in order to align the corners:

  • spatulas – straight and corner;
  • kelm, grater and half ate;
  • plaster in the right amount;
  • a bucket for kneading the composition;
  • drill with a mixer nozzle;
  • even board;
  • scotch.

Finishing of external angles

Plastering external and internal corners share some commonalities but also differs in many subtle ways. There are two methods for processing the external angles: with or without a counterattack.

Fronts without perforated corner

After all protrusions were expertly removed, the excavations were successfully seized and the board with the flat front portion of the corner was taped over in advance. To ensure that the indentation from the wall is equal to the thickness of the upcoming plaster layer, the ends of the boards are fastened at the floor and ceiling.

Apply a solution, use a rule to perfectly smooth it, and move in the corner’s direction. The board is taken apart after two days, when the solution has had time to solidify, and the process is repeated for the other angle side. Both surfaces are sanded with sandpaper following the last drying process.

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Working with a corner

The simplest method to use a counterattack to complete the joints between the walls. This corner is made of perforated aluminum for external angles. The gypsum mixture is first properly diluted after the material consumption (the total of all joints plus 20%) is determined. Put plaster on both sides; use pressing motions to secure the corners. Using a spatula, the solution that leaked through the holes is quickly removed, working its way down.

The level is used to determine whether the corners are positioned correctly. If not, products are moved in the proper direction, another solution is added, or some plaster is removed. Following the corner adjustments, another layer of the construction mixture is added from above. It is then allowed to dry before being cleaned using sandpaper or a construction grater.

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Plassing of the inner corners

There are various methods available for decorating the interior corners; all you have to do is select one.

Work with beacons

This technique works best when the walls are fully attached to the joints. The following will be the work order:

  1. Install guides made of wood or metal on the surface of two adjacent walls.
  2. Fix the beacons around the perimeter at a distance of a little smaller than the length of the rule (they should be about 10 cm from the wall).
  3. Apply plaster to one, then to the second wall, fill the entire area between the beacons.
  4. Align the plaster with the rule, excess in the corners is cut off with a wide sharp spatula.
  5. Form an angle with a corner spatula, moving from top to bottom and periodically wetting the tool with water.
  6. Give the material to dry, then remove the guides and fill the voids with a new portion of plaster.
  7. The beacons are removed, the cover (last) layer over the entire area of ​​the wall is performed; If the wall is designed for laying ceramic tiles, do without covering.

Plastering with a profiled corner

When the majority of the walls have already been plastered, this method is applied. Get a profile that has a stack of reinforcement, measure it, and cut it to the required length. Use a straight spatula to remove the corner after applying a small amount of solution to it, pressing it in place. You must handle the corner with extreme caution because it is prone to deformation.

Using a spatula, remove the solution that leaked through the holes and move it out of the corner in short strokes. The process involves waiting for the plaster to dry completely before finishing the corners and covering them with a layer of solution.

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Reinforcement decoration

When facing drywall, for example, reinforcement is used to strengthen the joint between the walls. They obtain reinforcing tape and a sickle for their labor. Additionally, diluted plaster and a rectangular wooden block measuring 60 cm in length are needed. Take this action:

  1. Plaster is applied to the joint in a small amount, capturing about 10 cm of the plane of the walls on both sides.
  2. Cut off the right amount of Serpi, press it to the top point of the corner, then spin the roll at the distance of the outstretched arm.
  3. Gently distribute the tape so that it does not shift to the side, repeat until the entire corner is covered with a sickle.
  4. With a light pressure, a bar is applied to the reinforcing tape, making a joint of 90 degrees from plaster.
  5. The excess solution is removed with a spatula, the tape is carefully ironed.
  6. After drying, apply another layer of plaster, form an angle with a corner spatula.

Plastering walls’ internal and external angles can be difficult, but with the right methods, you can create joints that look polished and seamless. This tutorial will lead you through all the necessary steps to align these corners, including surface preparation, tool selection, plaster application, and finishing touches. Our step-by-step instructions will help you master the art of corner plastering, ensuring clean, crisp lines and a flawless finish every time, whether you’re a do-it-yourself enthusiast or a future professional.

Errors when processing angles

It occurs that plaster work is completed without first evaluating the state of the walls. In this case, the solution may develop cracks as it dries, and occasionally the exfoliation areas. Other mistakes made by novices when plastering surfaces include:

  1. Lack of primer. In this case, the quality of the clutch of the solution with the base will decrease, and the level of alignment will be less pronounced.
  2. Applied shelter directly to concrete. Most often this leads to detachment of plaster. Save the situation can use ready -made polymer mixtures with high -quality binding additives.
  3. Working with long breaks. The corners need to be plastered into one entry, otherwise they will dry out unevenly.
  4. Plastering of raw corners. If the base is poorly dried, its humidity will remain over 4%, the solution will not be able to reliably stay on the surface.
  5. Fast failure of external angles. So that such zones are not damaged, you need to not save and always use metal corners that strengthen the surface well.
  6. Cutting a counterattack with a grinder. If you do not use scissors for metal, the protective zinc layer on the products spoils. As a result, rust will appear in the area of ​​installation of the corners over time.

Any building or renovation project that wants to look smooth and professional needs to have the internal and external wall angles plastered correctly. The overall look and longevity of your walls will be greatly impacted by the quality of your plastering, whether you are building from scratch or renovating an existing building.

Plastering internal angles requires a generous and even spread, so begin by plastering one side of the angle. Smooth the plaster outward from the corner using a trowel. Once it has had a little time to solidify, apply plaster to the side that is adjacent, making sure to smooth out the corner. Where the two walls meet, a clean, precise line can be achieved with the use of an angle tool or corner trowel.

Plasterwork can be strengthened and a sturdy guide can be provided for external angles by applying metal or plastic corner beads. Plaster over the bead after securing it firmly, making sure the plaster completely encloses the edges of the bead. To create a smooth transition between the angle and the wall’s flat surfaces, feather the plaster out from the bead using a trowel.

During this process, patience and attention to detail are essential. Make sure to smooth out any imperfections as you go, and give each layer enough time to dry completely between applications. Sharp, clean angles are easier to make with practice, which will improve the overall finish of your walls and make them ready for painting or additional decoration.

In the end, careful application, the right tools, and adequate preparation are the keys to plastering wall angles successfully. You can produce expert results that will last for years by adhering to these recommendations and continuously improving your technique.

Video on the topic

We align the inner angle. How to align it correctly?

How to put up the outer angles

Plaster of corners

Formation of the outer angle during wall plaster with gypsum composition Work with rails!

Installing external angles on the wall

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