How to cut a 45 corner at a corner

Work without a miter box

The polyurethane skirting board looks very nice in the interior. How to cut corners on such a product so as not to spoil its appearance? And here an inexperienced master will be helped by expert advice. Not always a home craftsman has at hand such a tool as a miter box. You can do without it.


For this, the markings are performed directly on the wall. First, the required length of the decorative item is measured. It is cut at right angles. Next, each detail is applied to the ceiling. Their contour is outlined with a pencil. This produces an intersection. It is applied to both skirting boards.

An inclined line is drawn from the point of intersection to the edge. This is the clipping boundary. Correct it before gluing by attaching both skirting boards to the corner. This is a fairly simple method, but even it requires a good eye and accuracy in work.

General characteristics of finishing

Studying the question of how to properly cut a corner on the ceiling plinth, you should familiarize yourself with the features of such a finish. The stucco molding between the ceiling and walls is now made of artificial materials. It can be polyvinyl chloride, expanded polystyrene or polyurethane. Wood can be used from natural materials.

In the construction business, the ceiling plinth is called (scientifically) a fillet. Of all the materials from which such finishing elements are made, polyurethane is considered the highest quality. Therefore, it is better to choose it. Next, let’s try to figure out how to cut the corner of the ceiling plinth. Expert advice will help you do this job well.

Preparatory work

To make the process quick and easy, use a tool such as a miter box. This is a U-shaped template. There are slot patterns in its side walls. They have a different angle of inclination.

There is another technique that allows you to evenly glue the ceiling plinth. Cutting corners without a miter box is possible. But still, the use of such a tool greatly facilitates the work.

First you need to mark the skirting board. If you want to create an outer corner, measure the length along the ceiling, and the inner one along the wall. For the fillet, a slope of the mowing line of 45 and 90 degrees is used. Since this is a fairly small number of slot options, it is quite possible to make a template yourself. All you need is a sheet of paper or cardboard.

If the repairer has considerable experience in carrying out such operations, he can cut corners without additional tools. The craftsman applies the fillet to the wall, and then marks the product right here. After that, he cuts off the excess. An inexperienced craftsman, most likely, will not be able to cut even corners the first time. Therefore, it is better to use a miter box or close irregularities with decorative corners.

How to cut corners on skirting boards? Step-by-step instructions, practical tips and advice

Repair is a responsible and costly undertaking. Although you can save a lot if you carry out the work yourself. Cosmetic finishing of the premises is carried out according to certain technologies. You can decorate the interior using a variety of materials.

Today, a very popular technique is the use of skirting boards to hide irregularities between the walls and the ceiling. In order for the contour to be aesthetic, it is necessary to do the work carefully. How to cut corners on skirting boards will help you understand the advice of experienced construction and repair masters. They will tell you how, using various tools, to perform the necessary manipulations with decorative finishes of various types.

Outside corner

Quite often, the contour of the walls in a room has a complex shape. In this case, you will need to figure out how to cut the outer corner of the ceiling plinth. To do this, it is laid on the bottom of the miter box in the same way as in the previous version, with the side that adjoins the ceiling.

Other slots are used for these corners. They also have a slope of 45 degrees, but are on the other side. Further, after marking and trimming, 2 plinths are applied to the corresponding place on the ceiling. Adjustment in progress.

Difficulties can arise when it is necessary to cut the same skirting board on one side for the outer corner and on the other for the inner one. Many people make a mistake here. First you need to cut the inner corner. Otherwise, a skirting board that is too shortened will not dock in any place.

Skirting board material

Experts agree that polyurethane is the best material for the presented finishing products. But even he has a number of disadvantages. These should be taken into account before cutting corners on the skirting boards. Polyurethane is susceptible to temperature changes. Therefore, it is not used for decoration in the kitchen or bath. Otherwise, the skirting boards will quickly crack and lose their aesthetics.

Expanded polystyrene has almost all the positive characteristics inherent in polyurethane. But it is still more fragile material. It’s easy to break.

PVC skirting boards are relatively cheap. But it is very easy to leave dents or gouges on them. Therefore, work with such products should be very careful.

Wood looks very nice, but not in all interiors. In addition, it is rather difficult for a non-professional craftsman to work with such material. Do you want to make repairs with your own hands? Then you’d better still choose polyurethane or expanded polystyrene.

Homemade tool

Don’t you have a miter box? No problem! You can do it yourself. When pruning for the first time, it is best to apply it in your work. This will require a plywood board, paper or cardboard.

Interested in how to cut the outer corner of the skirting board, as well as its internal varieties, you need to take this approach into service. Draw two parallel mowing lines on the selected material. Next, using a protractor, angles of 45 degrees are made around the edges.

A homemade tool is applied to the plinth, making the appropriate notes. The pruning technique is the same. The miter box is not used if the walls in the room are very uneven. When creating an angle of 45 degrees, gaps between the joints are obtained due to such inconsistencies. Therefore, pruning is done in the previous way. Before editing, the edges must be corrected.

Inner corner

First of all, it is necessary to consider the technique of how to cut the inner corner of the ceiling plinth. After all, in any room they are. If there are no external corners in ordinary rectangular rooms, then these varieties will have to be cut in any case.

A plinth is placed at the bottom of the miter box with the side that will adjoin the ceiling. The bottom of the fillet will be pressed against the wall of the tray.

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If the material is hard, it is cut with a metal saw. Soft items can be easily handled with a sharp knife. In this case, the angle should be equal to 45 degrees. If the pressure during cutting is too strong, hooks and chips will form on the plinth. An adjacent corner is cut in the same way.

Before gluing, they are applied to the wall and, if necessary, small irregularities are corrected. There should be no gaps between the skirting boards. If this is the first time this work is done, you can practice on small pieces.

How to cut a corner on a plastic corner

Plastic corners for slopes are the logical completion of the renovation in the house. They act as a protective and aesthetic design for doorways, window slopes and corners.

Today we will look at how to glue plastic corners on the slopes with our own hands and the better to glue the plastic corners on the door slopes.

Preparatory work

The installation process begins with the selection of the adhesive mixture. Polyurethane glue fixes plastic elements well, allows you to frame surfaces where there will be a load. Allows you to glue details in the bathroom if ceramic tiles are glued.

The silicone sealant is used as a fixer with less stress. The corner can be glued with the help of liquid nails, if the edging is dark, then it can be glued with the help of black composition, for light and white. transparent.

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Compare types and sizes

Framing always starts with choosing the type and size of the plastic element. The table shows data about plastic corners, their sizes and types for slopes:

Type: Size:
Equilateral: 2020. 5050 mm, standard length, fixed for strength.
Not equilateral: 517 and 2025 mm, facing of arch openings, it is customary to install on curved compositions.
T-shaped: 1210, 1810, 2010, 2210 mm, installation is necessary to hide the seams.
Removable (there is a latch): Standard, the shelf is folded back for dismantling. Simple attachment, no need to stick.

During installation, you need to cut the corner to form the desired length. A sharp stationery knife will help with this. If you need to cut at a clear angle, you will need to prepare a miter box and a hacksaw for metal.

Important! Color plastic corner for internal slopes is produced in lengths of 2.6 m, 2.7 m, 2.8 m, 3.0 m.

Photo gallery: finishing materials

It can be seen that the assortment is quite extensive, and there is plenty to choose from. But what should be guided by this? Of course, no matter how we would like, but almost always the budget is limited. Therefore, first of all, we have to proceed from our financial situation. As mentioned above, plastic products have a very reasonable price, while their appearance is not much inferior to analogues made from natural materials. But, in addition to the price, you should also pay attention to the fact that these decor elements harmoniously fit into the design of the room.

For arches, you should purchase special arched corners of different sexes, they ideally retain their position when bent. Please note that the wider the sides of this element are, the more loads it can withstand.

Installation of corners on the slopes of a window or door

Having figured out what such products are made of, what are their features and having decided on the choice, you should study how to install the corners on the slopes. Detailed instructions are given below.

Installation of plastic corners

The work on installing plastic corners on slopes is as follows:

  • Regardless of where you need to glue the plastic corners. on the door, if a casing or window is not provided, outside or inside, you need to make measurements and cut the material to length correctly.
  • Prepare the surface where gluing will take place. remove unnecessary elements, clean the base.
  • Install and glue the strips correctly.

How to properly glue plastic corners to any slopes:

  • Degrease the surface well before attaching the corner piece.
  • Polyurethane foam is not used in the design process.
  • Excess protruding plaster is smoothed out to a noticeable smoothness.

How to glue plastic corners correctly

  • The sticker provides for marking with a pencil.
  • Before you glue all the details, you should use the advice: it is better to measure the corners for the slopes of doors and plastic windows locally. Place the top horizontal element first, and then use the cutting tool to mark the vertical stripes.

Important! Using photos and videos, each beginner will cope with the gluing process on their own. The metal element is also fixed with self-tapping screws.

Sheathing with corners also implies additional fastening of the strips using narrow masking tape. Fix the strip with it in several places and leave it for about 24 hours. This time is enough to reliably glue the corners to the surface.

If the corner is used as a finish, then the place of its gluing should be cleaned of finishing materials. Thus, the grip quality is increased. When fixing on an area decorated with trellises, a strip should be cut a couple of millimeters wide than the plastic corners. Adhering to simple design rules, fixing decorative elements will be simple and quick, and in the end they will delight you with an aesthetic and relaxed look.

What glue to use

In addition to the corners themselves, we also need an adhesive composition with which we will fix the selected element. When choosing it, it is worth remembering that quite often, especially if it is necessary to glue a narrow product, the glue seeps out from under it and, naturally, falls on the walls. As a result, the latter can be damaged, which, accordingly, will negatively affect the appearance of the room as a whole. Therefore, you should choose such an adhesive composition, the excess of which can be removed from the surface.

Basically, the corners are glued to new slopes, but nevertheless, check that the surface is relatively flat, since no decoration can hide large bumps. It should be free of foreign objects such as nails, self-tapping screws, etc. It also needs to be degreased, for this purpose white spirit is suitable.

With miter box

The easiest and most correct way to cut the desired corner is done using a miter box. To do this, it is necessary to figuratively divide the two fillets that need to be mounted on the ceiling, into the left and right.

Conditionally the left plinth, attach from the left side to the “outer”, that is, the far side from the master performing the procedure, the bar. Bring the fillet edge to the grooves, fix the product with one hand and cut at 45º.

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The same manipulation is performed with the conditionally “right” fillet, it is applied from the right side, and the trimming is done in a mirror image. In order not to get confused on which side the fillet should be cut, you need to practice on small scraps of baseboards. To do this, you need to stick a plaster or construction tape on the miter box and sign with a pencil or pen on which side of which plinth to apply and cut.

What do the masters advise

In order for the work done to please both people living in this living space and their guests, repairs must be done with the utmost care.

A few tips from the beauty finishing professionals:

  • material from which fillets are made: polyurethane, wood, metal. Polyurethane is considered the most convenient for work. it is fixed with a sealant, is not subject to changes in humidity and temperatures, and is easier to process;
  • polyurethane fillets, or as the people call them “foam”, it is better to cut out with a clerical knife;
  • it is better to cut wooden skirting boards not with a hacksaw, but with a metal file. this will allow you to cut a product with fewer chips;
  • start gluing or fixing fillets on the ceiling or floor from the corners. After all the corners in the room have been decorated, it is necessary to proceed to the installation of skirting boards in the inter-corner spaces;
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There may be small cracks and chips on wood products. Defects must be covered with a sealant or putty to match the color of the product.

How to use the miter box

It is not difficult to work with this tool, but the skill and ability to use are necessary to make repairs in an apartment or a country house on your own.

To start working with a simple miter box, you need to mark the material to be cut off. After that, align the marks with the grooves on the tool, which correspond to the desired parameter, fix the product and cut the material with a saw.

The principle of working with a complex miter box is the same. Just before cutting off the material, it is necessary to set and fix the slewing ledge to the required value.

How to properly cut a corner on fillets in different ways

Skirting board, or scientifically “fillet”, is a popular decorative element that gives the finish an aesthetics and a complete look at the junction of walls and ceilings. The complexity of the installation of these structures lies in the junction of the corners, both internal and external. So that there are no gaps left and you do not have to mask them with sealants, you should accurately and accurately cut the product. Consider how to cut a corner on fillets in different ways to make the ceiling edging look attractive.

If the ceiling plinth has an angle greater or less than 90º

Unfortunately, the walls in the premises are not always rectangular. It often happens that there is a need to cut a non-standard corner other than the 90 and 45º templates. Craftsmen recommend using the method of direct fitting of products at the gluing site.

How to cut the inner corner of a skirting board

Ceiling, as well as floor corners are divided into external and internal. The installation methods for fillets or skirting boards are identical in both cases. the methods differ in a mirror image. Consider how to cut an inner corner for a plinth, since they are in an ordinary rectangular room, and there are no external ones.

If the angle is straight

For 90 ° and 45 ° corners, it is best to use a miter box. It is this tool that almost completely eliminates the appearance of cracks at the junction. The main thing is to be careful during the work.

How to saw down the corner of the plinth at the right distance

The second and all other corners of the skirting boards must be made at a certain distance. If the next corner is again internal and the distance to it is less than the length of the plank, use the same fragment on which there is already a cut. We measure the distance with a tape measure. strictly from corner to corner. Then this distance is laid on the bar using the same tape measure. We combine the beginning of the measuring tape with the ledge, measure the required distance, make a mark with a pencil. She will be the starting point for the cut.

You need to know at what distance to cut

Plinth with a mark is placed in the miter box, the desired direction of the cut is chosen. The dash can be combined with a hacksaw blade or with a slot in the miter box. As it is convenient for anyone. Cut off. This segment must be “tried on” in place. If both corners rest against opposite walls or the gap is only 1 mm, everything is fine. You can cut a second strip from a new piece to design a joint. And again we remove the flaws with sandpaper.

If the length of the wall is longer than the length of the plinth strip, take a new strip. We will cut the second corner on it. It is important not to be mistaken in which direction to cut. Having installed both planks along the wall, mark the joint on one of them, make a straight cut. For a straight cut, there are also slots in the miter box. So there won’t be any problems.

How to connect two skirting boards in a straight line

But the joint in a straight line does not always look perfect, and during operation it often diverges, forming a visible gap. If you wish, you can cut off at an angle (any) two planks.

To do this, first cut off the edge of one plank at an angle, mark the second joint. The mark is placed on the side of the plinth that is pressed against the wall. At this mark, we saw off another section, without changing the position of the saw relative to the miter box, but inserting the bar on the other side. The joint is oblique. It is more accurate. The difference is especially visible on wooden skirting boards and MDF. Cut, again, to bring “to mind” with sandpaper.

How to cut the skirting board correctly. Miter box for cutting corners

When installing skirting boards, it is important to arrange the corners correctly. It is they who often spoil the overall picture. How to make a corner on the plinth. external and internal, how and with what to cut. We will discuss all this further.

How and what to cut a plastic skirting board

All of the above applies to MDF and wood skirting boards. Cutting them with an ordinary hacksaw is not a problem. It is advisable to take a blade for metal, since it has a smaller tooth and the saw cut is smoother, you will have to work less with sandpaper. With plastic, the situation is different. when you try to cut a piece, some thin-walled skirting boards crumble and break.

Cutting plastic is not very convenient because of the thin walls

To cut normal quality plastic skirting boards you can use:

  • Hacksaw for metal.
  • angle grinder (angle grinder) with diamond disc.
  • A revolving miter saw. Before cutting, speed up the disc and only then start cutting.
  • A jigsaw and a file with a fine tooth. Here you have to try. select the speed and file.
  • Sharp knife.
  • Metal scissors. In any case, it is not difficult to make straight cuts with them.

Only personal experience will help you decide what is more convenient for you to cut a plastic floor plinth. If you have a miter saw, try using it. It is not a problem to try your angle grinder with a diamond disc a couple of times. If all this does not work well, try a hacksaw, jigsaw, or knife. There are, of course, special scissors for plastic, but they are too expensive to buy for a single use.

Accessories for the design of corners and joints of PVC skirting boards

In plastic skirting boards, you can design corners and joints using special fittings. There are external and internal corners, plugs and connectors. Basically, they allow you to assemble the desired configuration. Each manufacturer makes its own fittings. for its own profile, colors. But the principle of their use is the same.

How to shape the corners of a plastic skirting board

The first rule is that all cuts are made straight. Strictly perpendicular. Marks in the corners are set at a distance of 1-1.5 mm from the corner. The fact is that the rigidity fittings have their own jumpers. For them, it is necessary to retreat a couple of millimeters, but no more. Otherwise, a gap will appear or the skirting boards will pop out of these corners.

This is the result of the assembly

I must say that not everyone likes the look of plastic corners. You can make a corner on a PVC skirting board in the same way as described for wood or MDF. The only difficulty is that you have to be careful with plastic. it breaks down from excessive efforts. There is one trick. before cutting the plastic skirting board, add a little polyurethane foam on the back side and wait for the polymerization to begin. It will be tougher, easier to cut, less deformation. If the foam subsequently interferes, it is not a problem to remove it, but to cut it is, indeed, easier.

The first joint in the room

The first plinth of the skirting board should be cut as close to the edge as possible. Carpenters have their own jargon and they say “cut” the corner. It does not matter what you call it, it is important that in the miter box we set the bar so as to make a cut at the very beginning. For the cutting line, we push the bar a short distance, for a start, you can 1-2 cm. Cutting a smaller piece is more difficult, so save the savings “for later” when at least some skill appears.

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In the miter box, place the plinth at the far wall “facing” you. This makes it easier to check if you are cutting / sawing correctly.

  • We put the plinth in the miter box, press it against the wall opposite to us. We expose it in the mounting position. how it will stand against the wall.
  • Insert the hacksaw into the required slots (see the picture below).
  • Move the bar so that it goes slightly beyond the cut line.
  • Cut off.
  • We take the second piece of plinth, repeat the same operations, but change the position of the saw on the miter box to the opposite. We insert the bar on the other side. Be careful here, otherwise you will have to redo it several times, since the connection will not work.

How to properly cut a floor plinth in a miter box: for external and internal joint

We got two pieces of sawn cut for joining in the inner corner. To make the joint perfect, we try on the details in place. Most likely there are some flaws. We take sandpaper with medium grain, remove everything that interferes with docking. Then, with small grain, we achieve a tight joint without cracks and gaps.

When joining the skirting boards in the corner, use a transparent silicone sealant. Before installing the fasteners, a layer of silicone is applied to the cut. Immediately after the plinth is fixed, we remove the excess that appeared on the outside. We clean up to an absolutely clean surface. This way of connecting the skirting boards in the corners looks more neat, dirt and dust does not clog into it.

How to make a skirting angle more or less than 90 °

Not all angles are exactly 90 degrees. If the deviation is small, the cracks can be removed with sandpaper. In other cases, you will have to mark and cut taking into account the real degree. The main task in this case is to find a point on the floor where two plinths will join.

Let’s start by explaining how to properly slice the outside corner if it’s not 90 degrees. We take the bar, put it to the corner on one side, press it tightly against the wall. as it should stand. Draw a line on the floor with a pencil along the bottom edge of the plinth. We apply the bar to the other side of the corner, do the same. The intersection of the two lines will be the joining point of the two skirting boards.

How to join a skirting board if the angle is less than or more than 90 degrees

Now we attach the plinth strip again, set it in the way it will be attached. We make two marks: at the top at the turn itself, at the bottom in the place where the lines we draw intersect. Now an important task: it is necessary to make a cut according to these marks. If you have a miter saw or a miter box with an adjustable saw tilt, set it up and cut it. If not, carefully cut it with a hacksaw. In order not to get lost, you can use a pencil to apply the fishing line along which you need to cut. Similarly, mark and cut off the second part. Modifying the connection of the skirting boards with sandpaper.

Few of the professionals process the joints with sandpaper. this is time and additional work. But if you join skirting boards in the corners in your own house, with your own hands, you definitely want everything to be beautiful. This is what this manual debugging is for.

With a custom-sized inner corner, everything is exactly the same. We put a plinth in the corner, draw a straight line on the floor. We do it on the other side. Transfer the point of intersection to the planks.

Miter box for skirting boards

A carpenter’s miter box is a device for cutting at a certain angle. It is used with a hacksaw. In principle, you can make a miter box yourself by assembling a guide from the boards and making cuts in the walls. There are various models on sale, ranging from 15 to several hundred dollars. They differ in capabilities, materials, although all are called “miter box”. Professional models are made on the basis of a good hacksaw, have a scale that allows you to set the saw as it should. With such a tool, it is not a problem to set any desired cutting angle in order to correctly cut the skirting board for a perfect fit.

Professional carpentry miter box. a tool with a wide range

The simplest miter box is a plastic U-shaped profile, in the walls of which slots are formed. These slots are used as a hacksaw guide. They do not allow the canvas to deviate. In any case, there are two cuts. straight and at 45 degrees. Some may have a couple more options.

How to cut a plinth at 45 degrees? One way is to use a miter box

Sometimes a hacksaw is included, sometimes not. Usually the ones included are not very good. Any hacksaw can be used, picking up a blade for the material that is planned to be cut. It is important that the blade moves freely in the slots.

Making an external joint

In apartments or houses, there are not only internal corners, but also external ones. In this case, the nearest inner corner is first trimmed and modified. When it’s ready, you can make an outside corner on the baseboard. We put the bar in the corner, as it should be. In the place of the outer corner with a pencil, we make a mark exactly at the place of rotation.

How to make the outer corner of the skirting board

Then we transfer the bar to the miter box, choose the appropriate position. In order not to be mistaken, all the time imagine how the plinth is against the wall and what you should get.

We cut the second segment at 45 degrees so that it joins the finished one. To do this, we change the position of the saw to the opposite and start the plinth on the other side.

How to cut the skirting board in the inner corners: an action plan step by step

Begin installing the skirting boards in one of the corners. If this is your first experience, choose the part of the room where something will stand. Not always, it’s over, the first pancake is lumpy, but it’s still better to insure yourself. To make the corner on the baseboard neatly, work slowly. One was sawed off, checked, adjusted. Let’s move on to the next one. It is better to fix it after the two adjacent corners are assembled. But you shouldn’t postpone the assembly too much.

Trimming skirting boards in corners requires some skill. But by making several joints yourself, you can beautifully design complex corners.

How to use a miter box to cut skirting boards? Place the device in front of you, preferably on a table, but also on the floor. It doesn’t matter which side to turn it, it is symmetrical. Insert the bar into the profile, turn it so that it will stand against the wall. When washing down a floor plinth in a miter box, the “wall” is the wall that is farther from you. Once again: press the plinth strip firmly against the back wall in the position in which it will be installed. Insert a hacksaw into the desired slots. You can start sawing.