How to cut the ceiling plinth inner corner

How to cut a ceiling plinth: work with or without a tool

Any repair requires attention to the smallest detail. On how well the finish is made, depends on the look of the room and its overall perception. To a greater extent, this applies to ceilings, which in most cases are not perfect, so to hide all the imperfections (their and the walls), many owners use ceiling skirting boards, which give the rooms completeness. If the installation of the baguettes in straight areas does not cause any special difficulties, the joints of the elements in the corners require the utmost accuracy. Therefore, many owners who are planning, or have already begun repairs, are interested in how to cut the ceiling plinth, what tools can be used for this stage of the work.

The answer to the question of how to cut a ceiling plinth, depends on what material it is made of. Cutting is different, because the baguettes have different density. Therefore, the first thing to consider is the most popular materials, and at the same time the peculiarities of their cutting.


Such products have the lowest price, because the material is very unstable to mechanical influences. Foam is easy to scratch, damage by accidental impact. Pros. minimum weight, which simplifies gluing, easy processing, the ability to paint in any color.

This foam material consists of small granules, which are quite easy to separate from each other. However, they are the main disadvantage of such baguettes. They require a very sharp tool. Otherwise the skirting board could crumble and is therefore unsuitable for installation. This is true for both angular and straight cuts.


This contender is more expensive, but it is not very different from the first candidate, as it is a “relative” of Styrofoam: it is produced from expanded polystyrene. This material also consists of small bubble-granules, but they adhere to each other more densely. But expanded polystyrene will also not tolerate a blade that is not too sharp, it will also crumble. Therefore, the master needs to prepare no less than a sharp instrument.

The main advantage of foam and polystyrene foam is their softness, which allows you to avoid the appearance of gaps, tightly pressing the workpieces to each other and to the corners.

Extruded polystyrene foam

EPPS is made from the same raw materials as conventional polystyrene foam, but in this case a different, more advanced technology is used. Conventional EPS is made with the help of steam, which is passed through the microgranules.

To obtain the extruded polystyrene foam, the particles are mixed at high temperature and the same pressure, and then foaming agent is added to the raw material. Granule size in this material is much smaller (maximum 0.2 mm), as a result he less crumbly and more durable. Very sharp tools are not required to cut it, but bluntness of the cutting edge is also not welcomed.

Polyvinyl chloride

Plastic skirting boards (PVC). another type of ceiling products. They are usually purchased for finishing bathrooms. If we consider the topic “How to cut a ceiling plinth“, in this case they are exceptions, because for their docking use special, ready-made corners.

Generally speaking, these baseboards can be cut with a box cutter, a metal hacksaw, or a sharp kitchen tool. Since PVC products do not reshape due to their lack of elasticity, it is not recommended that they be pressed too hard when being cut.


This is another representative of polymer products. It has a high density and lacks the disadvantages of previous competitors. It is easy to cut, so the tool must be sharp, but there are no maximum requirements for its sharpening. Polyurethane baseboards do not crumble, do not warp, and can withstand almost any pressure with honour.


This traditional material is cut with the usual carpentry tools: for example, a jigsaw, hand or electric. Places of the cut are processed by sandpaper or file. Since such products are more expensive than other plinths, care is required when working. You can make a serious mistake easily, but you can’t fix it anymore. The consequence of negligence will be the purchase of a new baguette.

The ideal tool for cutting wood would be an electric mitre saw. The biggest disadvantage of it. the high price, especially quality models. On the other hand, customers have the opportunity to find an inexpensive tool that will do the job decently.

Tools to be used

First about how to cut a polymer or wooden ceiling plinth, how to do it correctly and quickly. In this case, 2 tools are needed for the job. a plane saw and a cutting tool.

What to cut skirting boards with?

As for the latter, the choice depends on the baseboard material:

  • Products of foam plastic (all polystyrene) suggest the use of a sharp office knife;
  • Skirting boards of polyurethane is usually cut with a hacksaw for metal;
  • Wood requires “active” participation of a jigsaw or saw.

The second potential tool for polyurethane is the same office knife. The reason is the rather low density of the material. Another alternative is to use a sharp, pointed kitchen knife. A special requirement for it is not too thick a blade.

A metal hacksaw is a possible substitute for a wood jigsaw. The blade with the smallest teeth is optimal. Otherwise, the tool will get stuck in the material, and it is extremely difficult to make a flawless cut under these conditions.

The chisel and how to make it yourself

The chisel is the second indispensable tool for dealing with baseboards.

What is it?

Not everyone may know what it is. This is a device that makes it possible to cut any workpiece at different angles (45-90°). This is a trough, consisting of the bottom and two sides in which slots are made for tools. The material is placed on the bottom of it, and a hacksaw (knife, etc.) is inserted into the slots. д.). After sawing baguettes using it you get almost perfect blanks.

Chisel. a must for trimming any baseboards, because the joints of the elements requires an angle of 45 °. Otherwise, the connection of parts will not work: either a gap will remain between the adjacent skirting boards, or they will simply need to be trimmed again, as it will be impossible to dock the adjacent products.

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Yes, the remaining hole can be masked with a compound. However, this option is still not the best. The filler may soon change color a little, and this discrepancy will become very noticeable. But even here there is an exception.

How to Make a Jigsaw?

To make it yourself you will need to find a board length of about a meter or more, or a sheet of plywood (chipboard). You still need to prepare it:

  • From the selected material cut out 3 parts with a width of 200 to 250 mm, their length. 300 mm (400, 500 mm). Using self-tapping screws, they are connected in a “U” shape.
  • Using a protractor, make marks on the tops of the sides, corresponding to an angle of 45 ° (if necessary, and 90 °).
  • Then take a hacksaw, which sawed the holes so that the grooves reached the bottom of the tool.

Finished holes are bored raspilnym so that they could freely enter a jigsaw or hacksaw.

How to trim the corners of the ceiling plinth: general rules

Trimming should be carried out on the outer edge of the skirting, as well as on the inside (when forming an outside corner) or the front side (for internal joints).

If everything is done correctly, the texture of the eaves will not be disturbed. In the home most often used finishing materials of foam plastic. The technology of joining the elements is as follows.

  • Using a protractor to measure the angle between the walls. If it is strictly equal to 90 °, cut the edges at 45 °. The action is performed with both elements.
  • If the joints between the ceiling and walls are not even, the radius of the corner should be divided in half. The baguette which will be attached to the left side is cut to the right, and the right element, respectively, to the left.
  • The edges of the details of the inner corner is cut so that the upper part was shorter than the lower. The edges of the outer corner form another way: their lower part is shorter than the upper.
  • Unlike skirting boards made of foam plastic, wooden parts need to be fitted precisely to each other and to adjacent surfaces by applying and trimming along the contiguity line.

Ceiling plinth (corners): the photo shows the trimming and joining techniques of the elements:

What tools can be used to cut corners

Cutting a ceiling plinth (outer corner) with explanations will be a good help for a beginner.

Help with a small production

In light of recent events, I want to share some potentially useful information with everyone. In Russia for about 10 years there is a network of manufacturing labs with smart machines like 3D printers, lasers, milling machines and more. And to take advantage of their services can, in principle, anyone. Most likely there is such a lab in your city, and maybe even more than one. Looking for a CMIT (Center for Youth Innovation Creativity). At a minimum, they can advise you on prototyping and making various parts and products, and at a maximum, they can help you with production. Of course, this does not mean that their possibilities are unlimited, but at the same time they are very wide.

For example, you can 3D-print a replacement for a broken gear, which is now difficult to get, or make a souvenir for the event on a budget.

I myself run such a shop and will be glad to help and advise you. Ask questions in the Комментарии и мнения владельцев, and I’ll do a series of posts about the equipment and capabilities of such workshops

Response to the post “The price of repair in one room

I made in a crumb-o-lantern of 28 meters. I was able to take a fully finished one in January.

It went like this. all stripped down to the slabs and bricks, do it all over again according to the approved and coordinated redevelopment with the design project.

Different counted. For example, one foreman said 150002500 (rough materials) per square meter, the other plus or minus a kilometer in a million with the net.

As a result, decided to do through a firm. Counted the estimate 410 without drafts and 15% on top of contingencies (which happened, as expected). The roughing was supposed to be 200-250. Bottom line. For all estimates I paid 715 with roughing materials. I myself bought quartz vinyl, ceramic tile, light bulb outlets, plumbing

I was very pleased and got exactly what I wanted. I won’t overload the answer, but if you want. I’ll show you pics of was/is

How to properly dock baseboards in the corners

Corner corners that are shaped the right way look nice

As a rule, the design of corners, both internal and external, takes the bulk of the time. Due to the fact that the ceiling plinths are very complex in shape, it is not easy to just take them and cut at the right angle. You need to cut so that they dock in the corner without noticeable gaps. To make the corners literally perfect, there are several ways.

The use of the jigsaw

The chisel, as a tool, is suitable if the corners of the room are joined at an angle of 90 degrees. The tool represents a groove, in the form of the letter “U”, turned upside down. On the walls of the gutter, cuts are made at different angles. In order to cut the decoration element evenly they are inserted inside the trough and then the element is cut at the right angle with the hacksaw.

This is what a wire cutter looks like. Can be plastic, wood or metal

Due to the fact that the skirting boards are complex in shape, they must be placed in the gutter so that they simultaneously pressed on two surfaces. the bottom and side. Depending on what angle is formed, the baseboard is pressed to the bottom and side, or the opposite, or the near surface.

As a rule, corners are trimmed at an angle of 45 degrees. First of all it is necessary to define the length of the plinth, having put certain marks on it. After that the element is placed in the jig so that the marking corresponds to the maximum length of the element, and then the element is cut off. It is also necessary to remember that the left side of the baseboard is placed on the left side of the chair, and the right side. on the right.

How to cut a corner on the ceiling plinth: properly install it in the chair

Ceiling baseboards are attached to the ceiling with one hand and the other to the wall, so the part that is attached to the ceiling, laid on the bottom surface of the chair. It is very important to hold the skirting board firmly and firmly during cutting, because otherwise the cut surface is unlikely to be flat and smooth. By cutting in this way the left and right part, you get either the inner or outer corner.

ceiling, plinth, inner, corner

How to cut a corner on the ceiling plinth: properly set it in the jigsaw

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First, both parts are applied to the place of attachment without glue, to control the quality of the work. If the corners do not match, they are corrected with a suitable tool. The advantage of polystyrene ceiling plinths is that small errors can be hidden by covering them with putty.

After the final inspection, a thin layer of special glue is applied to both surfaces of the baseboard.

How to make the inside corner of the ceiling plinth using a wire cutter

The technique of fitting ceiling baseboards in the corners is almost the same, regardless of which corner it is, internal or external. After applying the glue, the skirting board is pressed against both the wall and the ceiling. Naturally, the effort must be controlled, especially if the elements of the decor are made of foam. Not only that, you must work with gloves on so as not to smear the surface of the skirting boards, which can easily get dirty.

What to do if gaps remain?

If the defects are detected after the work is complete, then few people will like the prospect of redoing it. In this case it is easier to mask them with one of the compositions. The best option for such processing will be the final acrylic putty. It has a white color and is very malleable. Material is taken with the fingers, then it is pressed into the remaining gap, gently distributing in the hole, smoothing. Remove the remaining compound with a damp cloth. As a rule, there are no imperfections at the joints.

How to cut a ceiling plinth? Need to be equipped with the necessary tools and patience, as haste always provokes mistakes. The main thing in this case. choosing the best way. But attentiveness and accuracy are no less important: baseboards are made of not too strong material (except for wooden baguettes). They are fragile, so excessive effort when working with such products is contraindicated.

On how to cut the ceiling plinth, the author of the following video, which viewers believe is the easiest and most straightforward, will tell you:

Trimming ceiling skirting boards without a joiner

The walls in the room are not always flat, they may be between each other not at all 90 °. How to cut the ceiling plinth in such a case? You can use a simple marking on the ceiling.

  • Cut the baseboard at an angle of 90°, apply it to the ceiling, resting against the corner of the wall.
  • Run a pencil trimmer line on the ceiling surface over the trimmer strip. Repeat the procedure with the second skirting board.
  • At the point where the lines intersect, you need to cut the fillet. The trimmer line should go to the part of the batten that rested against the wall.

If you do not have a joiner, you can measure the angle by hand

When cutting the ceiling skirting, be sure to note that the inner corner is measured directly from the corner, and the outer will protrude into the interior of the room. So it’s better to start with trimming the inside, and then move on to the outside corner. Glue the skirting board after the two joints formed by the mating strips are aligned.

Not every interior design involves the use of ceiling plinthing, but most often the overall appearance of the room seems incomplete without it. In the attachment of this element. the fillet. there is nothing complicated, almost all types of baseboards are attached to the glue. But the question of how to properly cut the ceiling plinth in the corners of the premises, can puzzle many.

After all, even in the simplest rooms have interior corners where ceiling plinth strips must be precisely and beautifully docked. And in more complex room configurations will have to join the skirting boards, making the outer corner. In this article, we will consider different options on how to cut the ceiling plinth with the help of hand tools and without them.

First, you should deal with the question of what to cut the ceiling plinth, the answer depends on the material from which the fillet is made. Currently sold ceiling skirting boards of polyvinyl chloride (PVC), polystyrene foam (plastic foam), polyurethane and wood.

PVC ceiling skirting boards are the cheapest.

They easily form dents and creases, which can not be removed, so the product has to be discarded. Also their disadvantage is electrostatic. the ability to attract dust. They can be cut with a sharp construction knife or a hacksaw.

Skirting boards made of polystyrene foam are also inexpensive. This material is very fragile, when processed easily crumbles, so cut polystyrene with a sharp knife or hacksaw for metal, not making too much pressure.

Skirting boards made of expanded polystyrene are a bit more expensive than polystyrene boards, they are denser and harder to cut. Nevertheless, they are less crumbly, so they are easier and more convenient to work with. It can be cut with a construction knife and a metal hacksaw.

Polyurethane skirting boards are the most expensive at the moment. They are strong, flexible and water-resistant, can be easily cut with a construction knife and do not crumble.

A disadvantage of polyurethane skirting boards is their dependence on temperature differences. For example, over a gas stove, a polyurethane skirting board will acquire residual deformations and start to crack slightly. If you try to cut or trim such a skirting board, it might warp or deform in other ways.

Wooden ceiling plinths are dense, heavy products that can only be cut with a hacksaw, preferably with fine, frequent cogs. You can also use a metal blade.

Before proceeding to the listing of ways, how to properly cut the ceiling plinth, I would like to note that there is a possibility not to cut the plinth with special precision.

On sale there are special corner elements, in which the edges of the baseboard are inserted. In this case, the plank of the plinth is enough to undercut at an angle of 90 °, and the corner element will hide all the flaws. But this method is not always used, because the size of the corner elements is somewhat larger than the baseboards themselves, so the corners in the room will stand out against the background.

Sometimes this can look clumsy. Nevertheless, if the design of the room allows the use of angular elements for ceiling skirting, it makes sense to use them. The following instructions will be useful for those who do decide to accurately cut the baseboards to a given angle.

The first method. with the help of a jigsaw

A professional diecutter with a rotary hacksaw

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The jigsaw usually looks like a tray with vertical holes for a hacksaw. It can be made of wood, metal or plastic. This tool represents the oldest and simplest tool of the carpenter, designed for cutting wooden parts at an angle of 90° and 45°. There are types of such a device and for professional work, with a rotating mechanism, in which the cutting tool can be rotated and fixed in any position.

How to cut a ceiling plinth

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

If necessary, you can make a plier with your own hands. You will need three scraps of plywood or boards of equal size. First, they are attached in the form of an inverted “U” and make a marking of the corners. Then, according to the markings, cut notches under the hacksaw almost to the bottom, and the boards are twisted.

Inner corner

  • Make correct measurements.
  • Install the skirting board into the mortise, so that this position is exactly the same as the placement on the ceiling.
  • The skirting board must be pressed tightly against the opposite wall of the joiner. Hold it and press it down with your free hand.
  • Put the hacksaw at a 45° angle in a special hole and cut the piece.

When cutting soft materials (PVC, polystyrene foam) use a metal hacksaw or a regular construction knife. Then the work will be accurate and with straight edges.

Outer corner

  • Measure the length of the skirting board from the nearest wall to the outer corner, leave a trimmer line on the underside with a pencil, marking the desired length. Note that the edge (its upper part) should protrude slightly outward.
  • The skirting board is moved into the mortise and cut.
  • The adjacent strip must also be measured with a margin and cut mirrored to the first piece.

Trying on the ceiling skirting: the joining of parts must be perfectly flat. If the result is not achieved and the joints are uneven, you can trim the edges with an ordinary knife to perfect the joint.

The second way. without additional tools

For the inside corner you can use the easiest way to perfect the joint. by marking on the ceiling. Another example of how to cut a corner nice and flat.

The result is an even angle of 45 °, if you run a line for a trimmer from the point of intersection to the edge of the detail. Note that the above method of marking works only if the corners are perfectly straight.

Trimming a baseboard without a joiner

Agree, not everyone has a joiner’s tool at home, and buying it only for the baseboard is not a good idea. But the corners still need to trim, because the neatness of the ceiling finish is at stake. What to do in this case?

Actually, you can do without the joiner. There are even two ways to trim the baseboard corners without special tools: by resorting to marking on the wall and using a drawn false wood trimmer. Let’s start with the first one.

Do the work as follows. For the inside corner:

  • Attach the slat to the ceiling that will be installed to the right of the corner. Run a straight trimmer line along the ceiling along the outer edge of the baseboard.
  • Place the trimmer on the opposite side of the corner and run the trimmer line along the ceiling as well.
  • Mark the place where the two lines meet with an X. Hold the slat against the corner and transfer the mark to it, then draw a neat trimmer line to the lower corner of the workpiece. this is the line you will need to trim the baseboard.
  • Use a hacksaw or a utility knife to cut the necessary angle.
  • Place the trimmer strip on the right side of the corner. Run the trimmer line across the ceiling along the skirting board further from the corner.
  • Apply the baseboard to the left of the corner. Draw the trimmer line along the bar to the point where it intersects with the first line.
  • Transfer to the plank two marks: the first. the place of intersection of lines on the ceiling, the second. the place where the corner of the room passes. Connect the two marks. you’ll get a line for the baseboard trimmer. Now all that is left is to cut the corner and, if necessary, correct the gaps.

Corner trimming with a false chisel

The third way of trimming the corner of the baseboard is not quite usual. with the use of a kind of false chisel. You can make such a “tool” in two ways.

The first is to draw a jig. To do this, you can use plain heavy paper or cardboard: draw two parallel lines on the sheet and, using a protractor or simple angle piece, set off the angles with the required degree. The corner is cut in much the same way as in the case of a joiner’s plank: put the skirting board against the “tool”, make the necessary marks and make an incision according to them.

The second way. to make a prototype of a crossbeam from three wooden boards: connect them in the form of an oblong letter “U” and make notches in 45 and 90 degrees. The same protractor can also be used to mark corners.

ceiling, plinth, inner, corner

Chisel made of wooden planks

Cutting the corners of the baseboard without a notch, it is very important not to miscalculate the length of the plank and directly to the degree of notch. To avoid mistakes, at first it is better to cut blanks 10 cm longer, then try on the dry to the ceiling, and after that adjust until you get the desired result. In addition, let’s not forget that not all bathrooms have ideal angles of 90 degrees. you still can’t do without making adjustments to the products.

Advice. Only fix the baseboard plank to the ceiling after you have fitted the corner of the next baseboard piece to it. It is best to try the cuts not under the ceiling itself, but on the table. it will take more time, but the notch lines will be more accurate.

Thus, we have several ways of trimming ceiling plinths at once: with a joiner’s saw, without a saw, using a kind of false chisel. Whatever variant of execution of the corners you have not chosen, it is important to do everything in a precise and accurate manner. only then you will get a really effective tool for the final design of the ceiling, thereby making the interior of your bathroom aesthetically complete.