How to plaster corners: detailed instructions

One of the most difficult aspects of finishing a wall is plastering the corners, particularly if you want clean, crisp edges. A professional-looking finish depends on using the proper technique, whether you’re working on an external or internal corner.

We’ll walk you through every step of plastering corners in this guide, from surface preparation to proper plaster application. Even a do-it-yourself enthusiast can become proficient at this technique and advance their wall-finishing projects with the correct equipment and some practice.

Everything you require to know will be covered, including how to work with various kinds of corners and how to correct typical errors. These guidelines will help you create sturdy, well-groomed corners that complement the rest of your plastered surfaces.

Step Description
1. Prepare the corner Clean the corner of any dust and debris. Apply a coat of primer to help the plaster adhere better.
2. Apply the plaster Using a trowel, apply a layer of plaster starting from the bottom of the corner, working your way up. Smooth it out evenly.
3. Use a corner bead Place a corner bead on the edge for a sharp finish. Press it gently into the plaster.
4. Smooth and level Use a straight edge to smooth and level the plaster. Make sure both sides of the corner are even.
5. Let it dry Allow the plaster to dry completely. This usually takes a few hours depending on the thickness of the layer.
6. Sand the corner Once dry, gently sand the corner to remove any rough spots or uneven surfaces.

Rules for performing work on plastering corners

It’s not that hard to plaster corners by hand; you just need to take your time and be cautious. After all, in order to give it the proper geometric shape, the corner needs to be brought out.

If you invite craftsmen, the cost of such work is considerable. A video will demonstrate how to plaster corners on your own.

Preparing the plane

Preparing the base plane is the first step in plastering corners by hand. This will ultimately determine the material’s adhesion and service life. Whether it’s an external or internal corner, this work is completed in the same manner.

  • First of all, the old coating is removed. If this is a finished corner.
  • Now you need to check the deviations. This is done with a construction square.
  • If your corner is not right, then just look at its deviations using a plumb line. Or you can use a fishing line. Stretch it and see what layer needs to be applied.
  • If the layer is more than 2 cm, then it is better to make the corner by fastening the drywall. If less, then you can plaster.

Note: It is essential to apply a layer of primer prior to applying the material. Deep penetration is the preferable method.

Making internal corners

Corners that are not adjacent to any other surface must be finished as well as internal corners that are next to the facing surface when plastering surfaces with corners. Stated differently, we refer to fully developed corners that necessitate plastering two surfaces.

  • In the first case, when it is necessary to plaster only one surface of the inner corner, the solution is thrown on in the usual way. The solution is leveled with a rule in the direction from the corner to the wall.
  • After leveling the solution, you can begin to form the corner. To do this, take a trowel or float and place it against the inner corner at an angle of 30-40 degrees and begin to rub the corner with up-and-down movements.

Note: In this instance, the float’s working portion should be on the plaster’s surface and its edge should be pressed up against the facing surface.

  • During the movements, you should choose the optimal pressure on the float so that the excess layer of plaster is removed, but it is impossible to remove all the plaster.
  • When this layer sets, you can apply a cover to complete the finishing of the corner.
  • Finish the finishing of the corner with a foam or wooden float, making circular movements. As a result of such work, the surface is smooth, without pits and bumps.
  • In conclusion, several wide movements up and down should be made to finally form the corner. In this case, the grater should be tightly pressed both by the working side to the processed surface, and the grater edge to the facing surface.

Finishing the outer angles

The external and internal angles will be plastered slightly differently. There are two more ways to obtain external angles that are both equal and of good quality.

  • One method involves the formation of the outer angle using a metal perforated angle. Using this profile allows you to get a quality and reliable angle with minimal movements.

Pay close attention: the key to this method is to precisely install and firmly secure a metal profile. He must give the profile a chance to get a foothold so that it does not wander during the plaster.

  • You can fix it using a solution or gypsum putty. From how smoothly the metal corner will be exhibited, the outer angle will turn out so evenly.

In the second method, an angle is formed in two steps.

  • First, one side of the corner is plastered, and after it dries completely, they begin to plaster the other side.
  • To make the work easier, you can use a flat, wooden lath.
  • To do this, first install the lath on one side of the corner, and then on the other. When installing the lath, it is advisable to use a building level.

Note: The application of plaster to an obtuse angle is the same as that for an acute angle. Making sure the formation is accurate from the start is the most crucial step.

Although plastering corners can be challenging, you can accomplish seamless, expert results if you take the proper approach. We’ll walk you through every step of the procedure in this post, from setting up your supplies and tools to evenly applying plaster to both interior and exterior corners. Our easy instructions will help you master the technique, so that your corners are neat, sharp, and prepared for painting or finishing, whether you’re a novice or an avid do-it-yourselfer.

Plastering the slopes

Slopes that need plastering may develop after doors and windows are installed, and the plane where the two surfaces meet creates an outer corner that also needs to be formed.

  • During plastering slopes, you need to ensure that the slope flow angles are the same, which is achieved by uniformly distributing the plaster layers on the left, right and upper slope.
  • A template will help to evenly distribute the plaster over the surface of the slopes, which will help to form even and identical surfaces. The template can be made from wooden slats with a cross-section of 20×40 mm. The area of ​​such a template should correspond to the area of ​​the slope. In fact, it is a rectangle limited by slats along the perimeter.
  • The use of a template is justified when the slopes are wide and there is a place to attach the template. The template is attached to the slope in any available way, but in order not to use fasteners, it can simply be wedged.
  • After the inner part of the template is plastered and dries a little, it can be removed and the places that were freed up after removing the template can be plastered.
  • At the same time, the outer corner of the slope is formed.

Attention: Keep in mind that the formation is somewhat more complicated because the outer corners on the slopes don’t have straight angles.

Using a metal corner will unfortunately be challenging, but it is doable with the right knowledge. This is particularly true for locations that are in the way of people’s movement, such as balcony doors, entrance doors (see Finishing entrance doors: what options there may be), etc. You cannot omit metal corners in this situation.

Corner plastering may appear difficult initially, but with the correct technique, it becomes much simpler. You can achieve clean, polished corners that improve the overall look of your walls by following the above-mentioned steps.

Always take your time, especially when smoothing it out and applying the plaster. To make sure that the corners are smooth and well-finished, patience is essential. It is preferable to work slowly and do things correctly the first time, so don’t rush the process.

Finally, always remember to tidy up your workspace and tools when you’re done. By doing this, everything is kept in good shape and prepared for the next task. Plastering corners is a useful skill for any wall-finishing project because it will make you more confident and effective with practice.

Video on the topic

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Dmitry Stepanov

Professional decorator with 10 years of experience. I know everything about renovating apartments, houses and offices. I will be happy to share my knowledge and experience with you.

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