How to quickly align corners at 90 degrees

When plastering walls, getting precisely aligned corners at a 90-degree angle is essential for a polished appearance. A room’s overall appearance can be greatly improved by cutting those corners precisely, whether you’re working on a new construction or renovation project.

Even though plastering might seem like a difficult task, especially for someone who has never done it before, there are simple techniques and tools that can help you complete the task quickly. You can guarantee crisp, clean edges that improve any space’s aesthetics with the appropriate method.

Even if you’re not a skilled plasterer, we’ll go over useful advice and methods in this post that will help you quickly align corners at a 90-degree angle. Let’s get started and polish those edges to perfection.

Tools and materials

To ensure efficient and comfortable work, get ready with the standard plastering tools. You will undoubtedly require:

• A container for plaster mortar;
• A plumb line, a tape measure;
• A rule;
• Spatulas of different sizes;
• A trowel;
• A grater;
• A drill mixer.

Prior to beginning work, the surfaces must be prepared. Clean the wall joints and remove any brick or concrete drips that protrude. You can’t leave dust and dirt behind. It is necessary to remove any grease or bitumen stains that may be present on the surface.

When plastering walls, precise 90-degree corner alignment is essential for a polished appearance. We’ll walk you through easy, effective methods in this post to help you quickly achieve straight, sharp corners without getting frustrated. These pointers will assist you in completing the task quickly and precisely, whether you’re building something from scratch or remodeling an existing area.

How to plaster an outer corner

Beacons or a perforated profile (counter-splinter) are used to align the outer corners. Remember that while inner corners are rarely harmed, outer corners are susceptible to damage. For this reason, a perforated corner will come in handy in this situation.

According to beacons

When leveling an outer corner, the thickness of the plaster applied on one side attaches a flat board along a plumb line that extends onto the wall.

1. The plaster is applied in the usual way.
2. The entire surface of the wall is covered with gypsum plaster, and leveled from bottom to top with a rule. After plastering with gypsum mortar, the surface can be painted or whitewashed immediately;
3. A layer of cement plaster is applied to the wall, after which it is leveled with a rule and compacted, making semicircular movements with a float. Plastering with cement-based solutions is used in rooms with pre-finishing or rough finishing, and in technical rooms.
4. Then the board is shifted and removed, fixed to the second side and finish the other surface of the corner. Alignment is completed by stretching the template.

With a perforated profile

A 90-degree slope can be made even and strengthened at the same time thanks to a perforated profile angle.

1. Prepare a little mix that you use for plaster.
2. Find the highest section of the angle – the height of the installation of the perforated profile is determined by the ledge.
3. Trim or spatula, apply the solution to both walls from the junction over the entire height.
4. A perforated profile is installed on the plaster, slightly pressing it, aligned according to the construction level. Do not greatly crush the rule to the counterattack so as not to move.
5. After the solution freezes slightly, remove excess from the sides of the profile.

How to align an internal joint

Utilizing serpyanka tape or perforated profiles, internal corners are drawn along beacons. The plaster’s thickness and the effects of the walls’ curvature determine how the task should be completed.

Along beacons

This technique works well if you are plastering the entire wall and aligning the corners at the same time. Guide plaster beacons must be mounted on both walls.

Crucial! Only if the position of the beacons on the neighboring walls was verified with a 90° corner during the beacon installation process would it be feasible to form a right angle at the wall junction.

Plastering the walls one by one fills the space between the beacons with solution and uses a rule to tighten it. It should not be difficult to make an even corner if the beacons were installed correctly.

This type of do-it-yourself tool made out of mounting profiles allows you to align the plaster on both sides simultaneously.

Perforated corner

If the wall has already been plastered and finished puttying is done, then this method is utilized.

1. The putty is applied to the joint of the walls and the corner profile is pressed in, lightly pressing with a rule.
2. The protruding solution is removed with a spatula.

Serpyanka

This technique works well when you need to reinforce the intersection of walls, like plasterboard walls. Plastering solution, a 60-cm-long wooden block, and reinforcing tape must be ready.

1. The gypsum composition is applied little by little to the joint, smearing 10 cm of the wall on each side of the corner.
2. After this, the serpyanka is pressed at the top, and the roll is unrolled so that it goes straight down, pressing lightly. The tape is pressed with a block, creating a right angle.
3. The protruding solution is removed with a spatula and the edges of the serpyanka are aligned. You need to work carefully so as not to shift or deform the tape.

Plastering plane

Similar to equipment used to process aerated concrete blocks are plastering planes. The tool’s base may be solid or shaped like a frame with crossbars.

Two types of use exist, depending on the sphere:

1. Flat devices are designed to remove irregularities on the walls when using cement-sand compositions. They have frequently located blades that can move perpendicularly and parallel to the plane axis;
2. The products are designed for cutting corners and removing excess mortar from slopes.

After a novice craftsman plasters a wall, there might be visible lumps and waves. Plastering planes can be used to remove these defects by moving them along the surface to be treated and cutting off areas of the plaster that protrude.

Corner trowel

This tool’s 90-degree curved working surface was designed specifically for plastering corners.

Skilled professionals use a corner trowel if the joints on normally plastered walls have "fallen through" a little bit.

It is most often used for aligning internal corners, as perforated corners are installed more frequently. It is not very useful for aligning external corners.

A corner spatula is an additional choice. Although the handle of this tool is fixed to the side of the work surface, the principle of operation remains the same.

The instrument must function, with a small inclination towards the surface. Smooth movements distribute plaster evenly.

It may seem difficult to achieve precisely aligned 90-degree corners, but it is completely possible if you take the appropriate steps. Your walls will look better overall if you use a dependable corner bead and properly prepare your surfaces to produce crisp, clean lines.

Recall that accuracy and patience are essential. The outcome will be worth it if you take your time applying and smoothing the plaster. Avoid rushing the process as this may result in uneven corners and additional work down the road.

Whether you’re an experienced professional or a do-it-yourselfer, these easy instructions will help you get the ideal corner finish. Your walls will have a polished appearance and look well-done, adding value to your area.

Video on the topic

How to leve an angle according to the rule, in detail

how to set an angle of 90 degrees

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

How to align the internal corners of the walls of the apartment using the construction rule.

How to set beacons and form an angle of 90 degrees? Which plaster is better to use for a bathroom

How to align the walls of the walls of the budget and quickly with your own hands.

How easy it is to form an angle of 90 degrees and set the beacons in 10 minutes?