How To Cut The Outer Corner Of A Ceiling Plinth

How to cut a corner of a ceiling plinth The article describes methods for cutting corners of fillets and plinths, both with a miter box and without it with your own hands. Photos, drawings and dimensions.

How to cut a corner of a ceiling plinth

In this article we will talk about how to properly cut the outer and inner corner of the ceiling plinth with your own hands. This can be done without the use of special tools, but it should be understood that such work requires care and accuracy.

Which skirting board should you choose?

There are many varieties of fillets, which differ in the following characteristics: material of manufacture, shape, and also dimensions. When choosing a ceiling plinth, it is recommended to focus on all these factors, but the material of manufacture is the key point that determines the complexity of processing.

how to cut the outer corner of a ceiling plinth

The highest quality polyurethane fillets are considered. However, they are the least suitable for cutting corners, since the material is highly elastic. The easiest way to cut the inner or outer corner of a polyurethane skirting board is to use a miter box. The main disadvantage of such products is their poor resistance to high temperatures, so they are prohibited from being used in the kitchen.


Products made from other materials also have their drawbacks. Ceiling skirting boards made of PVC are prone to dents. In turn, polystyrene foam products break easily, so they need to be handled very carefully.

So which skirting board should you choose? There is no definite answer to this question. Experts recommend focusing on the individual characteristics of the premises and the budget calculated in advance.

Cutting corners without a miter box

Not everyone has the opportunity to purchase a professional cutting tool. And the expediency of such a purchase is rarely justified, since spending money on a miter box that will be used only once is not the best solution. You can trim fillets without it. There are several alternative ways to get the right angles.

Manual template preparation

The first and most common option for trimming fillets without using a miter box takes into account the use of a paper stencil. To implement this method, you will need to prepare the following tools and materials:

  • Protractor;
  • Pencil;
  • Cardboard.

We apply a plinth to the cardboard blank and cut it off with a hacksaw. Some craftsmen perform markings on the product itself. In this case, there is no need to use a template.

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The second option is to make your own cutting tool. To do this, you need to prepare 3 boards that have the same dimensions (50 by 15 cm). Next, you need to dock them together. The two side boards, which are walls, must be fixed to the cross board at right angles. The next step is to mark an angle of 45 degrees on the walls. You can take the necessary measurements using a simple square. The finished tool will allow you to arrange all the corners in the room in a short period of time.

The third method takes into account the use of improvised means. In this case, there is no need to construct a template. It can be replaced by a regular table, which will need to be moved to the wall. It is necessary to attach a fillet to the corner formed in this way, and then mark it. At the end, the part is cut off with a hacksaw or a construction knife.

How to get the correct angle

Most of the problems when working with skirting boards arise in the design of corners. Since the surface of the products is complex, it will not be possible to simply cut off at the desired angle: it is also necessary to cut so that they dock and, preferably, without large gaps. There are actually several ways to make the corner of your skirting board perfect (or almost).

What and how to cut

Working with skirting boards made from different materials means using different cutting tools. When working with a wooden skirting board, it is more convenient to work with a saw on wood. All others, including plastic ones, made of polystyrene and other polymers, are better cut with a blade for metal. The result is a smoother cut, less burr. Saws are usually used when working with a miter box.

Corner design looks attractive

When working with polystyrene skirting boards, they cut them with a good stationery knife without special devices. Its blade is quite thin and even, the cut is smooth, not wrinkled. If you work with a saw with polyurethane or polystyrene, do not press hard: you can wrinkle.

In general, to get used to the tool and material a little, take a piece and practice on it: cut, saw, trim. So there will be fewer problems when working.

What is it made of and what is it called

The very first skirting boards on the ceiling were made of plaster. They were cast in special molds and then installed on the ceiling with mortar. Such figured decorations were called fillets. Today you can rarely see them: they are expensive, and outwardly they are almost indistinguishable from the cheaper options. And the name is almost lost.

The most popular ceiling skirting boards are made of polyurethane or polystyrene. They are inexpensive, look great, easy to install, have a wide range of profiles and patterns. The width can be from 5 mm to 250 mm. They are used in almost any room, decorated in any style. The exception is wooden houses with a corresponding interior. Wooden products are most often used here. The style dictates its own conditions.

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There is also a similar plastic finish. It is mainly installed in bathrooms. But even in damp rooms, you can safely mount polyurethane strips. They are not afraid of dampness.

You need to cut the ceiling plinth in the corners of any material in one of the ways described below. The only exception is plastic skirting boards: you can arrange such a corner only using ready-made corners.

How to properly cut a ceiling plinth at a 45 ° angle

Corner pieces for skirting boards can be easily trimmed on the miter box or by hand. In the first case, you will need a miter box and a hacksaw, and in the second, a pencil and a hacksaw / knife on cardboard. The blade of the hacksaw should be well sharpened so that you do not have to think about how to cover up chips and roughness on the cut.

Cutting the corner with a miter box

Take a polyurethane skirting board designed for the left or right side of the corner. We lean it against the future installation site so that the end of the segment opposite from the corner is in the edge of the already glued molding. In the place where the lower edge of the ceiling plinth is in contact with the top of the corner of the wall, put a point with a pencil or stick a piece of insulating tape. We repeat these actions with the second segment.

  • We place the left blank in the miter box from left to right, pressing it to the edge closest to us. The corner vertex mark must match the leftmost slot in the same edge
  • We place the right blank from right to left, pressing it to the near edge. Corner apex mark. To the far right notch.

How to cut a ceiling plinth to an inner corner? Everything is very simple, the actions will be exactly the same, only the location of the corner vertex mark changes. Here, on the contrary: for the left segment. The extreme right slot, and for the right. The extreme left. Finished ceiling fillets must be combined, and then look at the joints to the light. There should be no cracks. If they are very small, then editing is not needed, you can do with filling with putty after installation.

How to cut the corners of a skirting board without a miter box

If you are wondering how to properly saw down a ceiling plinth without a miter box, then the following information will be useful to you. We take the right piece of the ceiling plinth made of polystyrene, apply it to the installation site and draw a line on the ceiling along its upper edge. It should go beyond the points of the vertices of the corners by about 5 cm. Do the same with the left segment and put points at the intersection of the lines. We put the ceiling plinths in place one by one and transfer the resulting marks to them.

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We figured out the upper part of the ceiling moldings, now we move on to the bottom. Everything is simple here, the marks we need are the tops of the corners. Mark their location with dots on the lower edges of the left and right ceiling plinths. Next, you need to connect the points on the moldings. This will be the trim line. This method will help to cope with even the most curved corners. Adjustment is most likely not needed, and if it does, it will be minimal.

How to cut a ceiling plinth without a special tool: the photo shows the marks for the intersecting point method

Outside corner

  • Measure the length of the plinth from the nearest wall to the outer corner, leave the fishing line on the wrong side with a pencil, indicating the desired length. It should be noted that the edge (its upper part) should protrude slightly outward.
  • The plinth is moved to the miter box and cut off.
  • The adjacent strip must also be measured with a margin and cut off in a mirror image to the first part.

Trying on the ceiling plinth: the joining of the parts should be perfectly flat. If the result is not achieved and there are irregularities at the joints, you can trim the edges with a regular knife to a perfect fit.

Checking the smooth docking

How to cut the corner of a ceiling plinth straight

A beautiful and neat edging of the ceiling hides the joints between the coatings and is an additional element of the room’s decor. But in order for the ceiling plinth to look really beautiful, you need to be able to properly join its corner joints.
How to cut the corners of the ceiling plinth evenly can be found in our article.
Related article: how to properly glue the ceiling plinth with glue and putty.

The first way is with a miter box

The miter box usually looks like a tray with vertical holes for a hacksaw. It can be made of wood, metal or plastic. This tool is the oldest and simplest carpenter’s tool for cutting wood pieces at 90 ° and 45 °. There are types of such a device for professional work, with a rotary mechanism, in which the cutting tool can be rotated and fixed in any position.

How to cut a ceiling plinth correctly

Ceiling corners are divided into internal and external, the method of joining them is slightly different.