High-quality repairs: how to properly putty external and internal corners? Work principles

A smooth and perfect wall is essential to any high-quality remodeling project. Gaining proficiency in the art of puttying corners—both internal and external—is essential to accomplishing this. If not properly cared for, these corners are prone to imperfections and cracks that can damage a room or building’s overall finish. Gaining an understanding of the fundamentals of efficient corner puttying can improve the longevity and visual appeal of your walls significantly.

During the puttying process, extreme caution must be used at internal and external corners—where two walls meet and where walls meet structural elements like pillars or beams. Not only are gaps to be filled, but a smooth transition that improves the corners’ structural integrity is also the aim. In order to ensure longevity and resistance to cracking, especially in areas subject to movement and stress, properly puttying these corners requires the use of the appropriate materials and techniques.

Important guidelines include making sure the corner surfaces are thoroughly cleaned, dry, and free of any debris or dust that can interfere with adhesion. It is important to select the proper putty or filler for the particular corner, whether it is an interior corner in a room or an exterior corner exposed to the elements. A professional finish is largely dependent on techniques like applying putty evenly and smoothly with knives or corner trowels.

How to make it yourself?

Inside the apartment on concrete walls

Make sure the internal corners have an uneven surface before tying them in place. Even recently constructed, newly constructed buildings have curvature in their floors. It’s very hard to locate straight angles. They can be arranged in a round or very pointed way.

The only way to fix severe differences is to apply a layer of plaster over them. Technology for applying putty correctly:

1. Work begins from the corner: from there the walls will be more evenly aligned around the perimeter.
2. If any part of the base is piled up or down, the work is carried out in stages, constantly monitoring the deviation.
3. First the solution is applied to one wall, then to the other. It is best to cover the area as much as possible, coat as large areas as possible, use a medium-sized rule and a small spatula.
4. You almost never get the perfect angle the first time. Therefore, after the base layer of putty has dried, a slight rounding can be observed.
5. To avoid unevenness, use a hand grater on which sandpaper is attached. A prerequisite is that it must be attached with an overlap at the very edge of the tool.
6. First, one wall is sanded, after which they alternately move to the other parallel side. Rub with rolled up sandpaper with quick, energetic movements. This is the only way to achieve an even connection between adjacent walls.

The corners and the walls are both level. By working simultaneously, you can ensure that the coating is uniform and prevent joints from forming from the dried plaster layer.

Watch this video to learn how to caulk interior apartment corners:

External

Using corner pads designed for this purpose will allow you to achieve an exact right angle with a flat surface. Overlay types:

• Metal. Made from aluminum or thin steel. The product is perforated. This allows you to reduce weight and sink it well into the thickness of the wall. The disadvantage of using such linings is the possible occurrence of corrosion when exposed to moisture.
• Plastic. The properties are similar to metal ones, but their corrosive destruction occurs to a lesser extent, it is practically invisible to the naked eye. Suitable for applying a thick layer or several layers in a row. The thickness of the sides increases significantly.
• Flexible parts. Used for work with curved corners. Helps align the edges of the arches in the desired direction. They are characterized by easy shrinkage, since the product quickly takes the required shape and does not form breaks.

The putty shrinks slightly as it dries. As a result, you must apply a thin layer of new paint to a portion of the wall.

Watch this video to learn how to putty exterior corners:

Between wall and ceiling

Because the upper corners are harder to process than the lower ones, there is typically a more curved surface between the wall and the ceiling. In this measurement, the plane can only be controlled visually.

Using the arched corner for work is convenient. Because it is composed of flexible plastic, it bends perfectly. It creates flawless joints on arches and intricately designed structures.

1. Check the ends of the structure for protrusions. If necessary, level with a construction knife or plane. Also pay attention to the protruding caps from the screws on the plane. If they stick out, you need to carefully tighten the fasteners.
2. The base is treated with primer, the joints are carefully coated, since they are unprotected and need careful strengthening.
3. Then take the arched corner, measure and cut it to the required length, but not too long a piece, since the excess at the joints will stand out and interfere with the alignment of the finishing layer of plaster.

Finish the curved plane first when applying the putty mixture, and then the joints with flat walls last. Ensuring uniform distribution of the composition is crucial. If there are any joints or irregularities, they can be fixed.

Working principle

1. Before puttying, inspect the surface. If there are visible protrusions, the flaws are corrected with a construction knife. Check the vertical with a level and pencil. Marks are made in those places where there are significant deviations. Both sides should be primed at a distance of 3 cm from the joint. In places with obvious differences in height, pay special attention.
2. Then apply a layer of putty to the surface of the base adjacent to the corner. Movements are made from top to bottom. A metal or plastic corner with perforated sides is preliminarily placed in the applied solution.
3. Using a narrow spatula, remove all excess mortar that comes out through the corner holes.

Making right angles allows for the formation of slopes using a perforated angle. Beveled corners are not finished with this material.

Possible mistakes

Potential errors that can occur when using putty include:

• Internal corners are sanded without prior preparation. It is imperative to carry out a construction square on them before applying the mortar. The direction should be from ceiling to floor. All deviations are marked with a pencil. The protrusions must be cut down with a plane, and the depressions must be puttied and primed.
• The solution is applied superficially and does not coat the joints in the corners. It is important to level the mortar one by one so that there is no excess on the walls and no imperfections in the corner dips themselves. To coat the joints, you need to use a small spatula, which is needed to help a large tool.
• Self-adhesive mesh is not used when puttying plasterboard surfaces. This is a big mistake. The mesh must be used with a certain size. Its width should not be less than 5 cm, but it should not be much larger either. No bends or distortions should be allowed.
• The sequence of actions is not followed. It is better to plaster the uneven areas, then prime them and then putty them. And the corners between the ceiling and the wall can first be puttied, then reinforced with metallized tape, and then puttied again. If the sequence of work is not followed, you may not get a very good result.

A seamless finish on both interior and external wall surfaces depends on properly puttying corners. You can make sure your corners look professional and last a long time by adhering to a few fundamental rules.

Begin by thoroughly prepping the corners. After clearing away any dirt or dust, make sure the surface is dry and smooth. In order to encourage strong adhesion and keep the putty from cracking over time, this step is crucial.

Select the appropriate putty type for the task. Paintable, flexible putties made of acrylic or latex are perfect for interior corners. They are easily smoothed for a clean look and permit small movements without breaking. More resilient solutions, such as silicone-based putties resistant to weathering and temperature fluctuations, might be needed for exterior corners.

With a corner trowel or a putty knife, carefully apply the putty. To ensure even coverage, begin at the top of the corner and work your way down. To reduce the need for extensive sanding later, feather out the edges to blend in seamlessly with the surrounding surface.

As directed by the manufacturer, give the putty enough time to dry after application. After drying, give the corners a quick sanding to get a smooth finish. Before painting or applying the finishing touches, make sure there are no flaws and make any necessary touch-ups.

You can achieve excellent results when puttying corners, both internal and external, by adhering to these guidelines. It takes careful planning and attention to detail to make sure your corners look fantastic and hold up over time.

In the world of construction and renovation, achieving high-quality repairs hinges greatly on mastering the art of puttying external and internal corners. These corners, often overlooked, play a crucial role in the aesthetic appeal and durability of walls. The key principles revolve around meticulous preparation, using the right tools and materials, and applying techniques that ensure seamless integration with the surrounding surfaces. This article delves into practical steps and tips for both novices and seasoned professionals, emphasizing the importance of precision and patience in achieving flawless results. Whether tackling a simple touch-up or a major renovation project, understanding these fundamentals ensures corners that not only look impeccable but also withstand the test of time.

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