How to install doors in an apartment with your own hands. Installing interior doors with your own hands: how to do everything correctly and efficiently

Install interior doors not as difficult as it might seem at first glance. If the master has at least a little experience working with doors, then this is a big plus. The only thing that is better to entrust to a specialist is the insertion of fittings. Wrong installed fittings can ruin the entire result of the work.

Stages

Installation of interior doors occurs in several stages:

1. Box installation.
2. Installation of canvas.
3. Installation of additional elements.

Preliminary stage

The technology for installing interior doors is quite simple. However, before starting work, there is one important step that cannot be skipped. This is the door selection stage.

The final result largely depends on how responsibly you approach your choice.

1. The first thing to do is go around the shops. You shouldn't take the first option you come across. If we are talking about online stores, then you need to carefully check the characteristics of the designs.
2. The door leaf should fit the frame perfectly in size. All characteristics of the door must be known in advance. You can't do this without measurements.
3. Sometimes very cheap options appear in stores. After purchase, the owner may discover that the box or accessories are not included. You have to spend time and select the remaining parts. It's not always possible to do it right. Therefore, there is no need to look at door designs that are too cheap. As a last resort, you must first clarify the presence of certain parts in the kit.

Materials and tools

Materials and tools for installation must be prepared in advance. Tools you will need:

• wood hacksaw;
• screwdriver;
• level.

Materials you need to purchase:

• polyurethane foam (cylinder);
• self-tapping screws;
• wedges

Assembly and installation of the box

Once the door has been purchased, you can get to work. At the first stage, the box is assembled.

Assembling the box is a simple process. The only thing you need to remember is that it is necessary to trim off the frame frames in order to establish a gap between the door leaf and the floor. For ordinary apartments, the gap is set to about 10 mm.

After the gap is established, the racks are connected using self-tapping screws. After assembly, the stage of installing the box into the opening begins.

It is advisable that the opening be pre-treated. To do this, check the verticality of the walls, as well as the height and width of the opening.

The box is installed using a level and wedges. The level checks the position of the structure in the opening. The procedure is as follows:

1. The box is fixed in the opening with wedges at the top and bottom.
2. First, the door must be fixed with wedges from below, before checking the position of the structure in two dimensions with a level.
3. The average gap between the frame and the opening on all sides should be about 10 mm.

The door leaf is hung on hinges. At this time, the box is secured only with spacers and wedges.

You should not foam the door frame before hanging the door leaf. The point is that you still need to make sure that the door in this position will not open on its own.

After the canvas is hung, you can foam the gap between the box and the opening.

It is necessary to ensure that the foam does not get on the surface of the door. The composition of the polyurethane foam can easily damage the surface, so you should work carefully.

Now you need to install the additional element.

1. The additional strip is measured to fit the distance from the edge of the box to the edge of the wall.
2. Using a hacksaw, it is cut along the edge.
3. The additional element is mounted in the groove and foamed. Foaming is done at several points.

Platbands

After the additional element is installed, you need to wait for the foam to dry. When working with polyurethane foam, you must remember about its expansion properties. The substance should always be applied in measured doses.

The next stage after installing the additional strip is the platbands.

1. To install platbands, you need to determine their size.
2. After this, the platbands are sawed off using a hacksaw.
3. Holes for nails are drilled.
4. The casing is fixed.

If the platband has a “beak”, then it is attached to liquid nails. There is no need to file it down.

Types of interior doors

Today in stores you can find doors from natural wood, glass, plastic, metal and composites. Mixed designs are also found.

Usually the choice is made taking into account the design of the room and this the right approach. However, it is necessary to consider all the main varieties of these designs in order to know their advantages and weak spots, as well as the subtleties of care.

1. Paneled from hard wood. Such designs are very durable and prestigious. Moreover, they are very expensive. The most common paneled doors are made of oak and walnut. Designs are made either using glue or without it. The last type is the most durable. Caring for such a door is necessary, as with any natural surfaces. The door must be protected from moisture and high temperatures. It is recommended to wipe them with a napkin. The use of abrasives is prohibited.
2. Paneled from soft rocks wood Ideal for country houses and cottages. IN ordinary apartments These doors don't look very appropriate. They are more suitable for country style. Caring for such structures is the same as for hardwood doors.
3. Paneled combined doors. These structures are made of veneer. Valuable breeds they contain little wood. Therefore, such doors are quite inexpensive. Their service life, however, is shorter than that of solid wood structures. However, they can last about 50 years, which is also very good. No special care is required for veneer doors; this is their advantage.
4. Panel structures. The advantage of panel doors is that they are inexpensive and do not require special care, are easily replaceable, have a presentable appearance. In addition, they are well decorated and fit into any interior. About 85–90% of all doors are panel doors. This design can be glazed, decorated natural veneer or artificial materials. Panel doors - best option for most apartments and offices.

Video: instructions for installing interior doors

Photo

Scheme

Almost any novice craftsman who has minimal experience handling a level and a hacksaw for wood. No special skills are required here. It is quite possible to install a door block in your home yourself. You just need to measure everything correctly before installation, and during the assembly process, make sure that no distortions occur.

Technological progress has replaced the once cumbersome entry doors that our ancestors used with convenient, practical doors. The need to constantly move stones and other heavy objects back and forth many times during the day in order to cover the opening and protect from bad weather disappeared with the invention of awnings.

Modern doors tend to be installed for decades. How to assemble and install them correctly is an important question after all the parts have been purchased and laid out on the floor!

Work procedure for a home handyman

The door is not a simple board blocking the entry hole. Nor is it an extremely complex structure. Nevertheless, after assembly and installation it must meet a number of requirements:

• Open - close without significant effort, creaking and grinding;
• Do not fall apart when slamming shut after nervous breakdowns;
• Don't open up on your own;
• Not to be so thin and fragile that even a child will pierce it with his pen when he wants to draw on it.

We attach the canvas to the awnings. Let's see what happened. We check that there are no distortions in the gaps. All installed structure We glue it around the perimeter with construction tape.

We foam the free cavities between the wall and the frame in several passes, first place pieces of cardboard in several places (at 4-6 points of the internal gaps of the structure) so that the door does not jam and it can open freely.

We wait for it to dry completely and do nothing else for now. We don’t open it, we don’t check it.

We trim the trim along the contour of the door, hiding unsightly seams.

Thus, the interior door was installed with our own hands. Experience has been gained that can now be used to improve other doorways.

Photo of the process of installing interior doors with your own hands

Beginners, having decided to do all the work of installing interior doors themselves, often miss important nuances which are well known experienced craftsmen. An important point careful preparation for installation work and the use of reliable fasteners will be necessary.

Right installed door will close without extra effort, without falling apart, even if they clap periodically. The supporting base is the box. The reliability of the structure depends on how strong it is.

The structure must be correctly aligned - for this you need to purchase a building level. It is best to use a laser, as it is very convenient to work with.

Installation of interior doors is carried out in several stages. The door leaf and frame must be equipped with fittings. To make it convenient to close the door, you need to install a handle. If required, it can have a lock with a spring mechanism. Hinges should be made on the door and frame. The canvas can only be hung after preliminary adjustments have been made. After this, you can proceed to the installation of platbands.

How to markup

Installing doors with your own hands will require labor from a beginner. If the master completes the installation in 1 day, then a novice builder can spend much more time. This point must be taken into account if emergency installation of the structure is required.

It is important to complete all steps in a clear sequence, strictly observing building codes. A number of door blocks already have fastenings for installation. But there are products whose box will have to be assembled on your own. They are sets that include blocks of wood and strips for platbands. Besides, in ready set the manufacturer includes the door leaf.

If you decide to assemble the box yourself, you can use different methods. You need to pay close attention to the quality of the work, because if even the slightest error occurs in the measurements, you will either have to do all the work again or buy new parts of the structure.

Install the door in interior partition possible with or without a threshold. The most simple option It will be possible to install a structure without a threshold, but option 2 will require the presence of a timber strip. In this case finished design will look like a rectangle.

Step-by-step instructions will be of help. Before starting work, it is necessary to take exact measurements. First you need to find out the dimensions of the opening. Then you should make calculations by determining the dimensions of the side posts and the lintel. Then you need to determine optimal size door leaf, not forgetting the technological gaps. Having made the markings, the elements are sawed off using a hacksaw, and then the assembly of the interior doors begins.

It is important to correctly calculate the thickness of the box, which should be no less than the thickness of the wall. To ensure accurate measurements, you need to use a tape measure. Beginning builders should not rely on identical elements, such as side posts, being “mirror-like.” To avoid measurement error, each item needs to be measured separately with right side, and then with the left. If deviations are found in the process, they must be taken into account in further work.

How to install an interior door yourself? Particular care must be taken to position the fender beam, which must have a gap for the mounting foam. It is enough to allocate 1 cm to it. The same should be done with the lintel and hinge bar.

The gap on the inside should be much smaller, 0.3 cm is enough. If the interior door has a threshold, then the gap should go along the entire perimeter of the structure. When installing a structure without a threshold, a gap must be left between the floor and the canvas. The average value is 1 cm. Such assembly and installation of interior doors will be considered completed correctly.

On the vertical posts, marks for sawing are required, which are determined on inside bar. If the hole size is insufficient, it must be enlarged. If the hole is too large, it can be reduced by laying plasterboard cut to size.

Door installation options

To make a cut, it is better to use lathe. In this case, installing the door frame will take little time. If you don’t have a machine, then a hacksaw and miter box are suitable alternatives.

When installing an interior door, you can use the following 2 methods:

• make a cut at an angle of 45º;
• do the work at an angle of 90º.

How to install an interior door with your own hands? If we talk about option 1, it is quite complicated. The work will require increased attention from an inexperienced carpenter. But as a result of carefully executed joining, you will get a product that looks very beautiful.

In order to connect several elements, you need to use self-tapping screws. You need to make special holes for them. If the door is made of MDF, then the work should be carried out in advance, which will avoid damage to the workpieces. It is most convenient to work using a drill whose diameter is 3/4 of the diameter of the fasteners. It is best to buy self-tapping screws whose threads reach the head.

If we talk about method 2, it assumes that the cutting angle will be 90º. To perform the work you will need a hacksaw with fine teeth. The upper beam is attached to the vertical posts with 2 self-tapping screws; they are screwed in on each side. In order to make a threshold, the timber must be cut at a right angle.

The easiest way to assemble the structure is to lay out the elements on the floor or big table. The master must install the fittings. Carrying out interior decoration, it is necessary to secure the functional fittings correctly.

Don't forget about fire safety. In order to quickly evacuate the premises, it is necessary to install a door that opens outward.

How to install interior doors? There are several options. The hinges are hung on the right or left - there are universal products on sale. If previously it was possible to buy hinges that required careful insertion, now you can purchase products that do not require cutting the veneer.

You need to make an indent from the top edge of the canvas, 20 cm is enough. Then hang the loops. You should retreat the same distance from the bottom. Variations are possible: in these cases, they retreat 5 cm in both directions. The structure can be further strengthened by hanging 3 loops. It is placed 50 cm from the top line.

Self-installation of the door frame

In order to fix the box in the opening, you need to buy an anchor. The door will be held securely by 3 long screws. In addition, the structure will support polyurethane foam.

You can drill a door frame made of wood without preparatory work. The installation procedure is as follows:

1. The door base is assembled on the floor.
2. The structure is lifted and installed in the opening.
3. Wedges are made from leftover lumber and placed between the walls and the frame. This creates a gap for the polyurethane foam.
4. Screwing in self-tapping screws. Leveling the base using building level. The accuracy of the installation can be checked with a plumb line. If deviations are detected, they can be corrected by loosening or tightening the screws.
5. Installation of hinges and fabric. Before applying polyurethane foam, the box must be sealed with tape. You need to insert cardboard into the gap. The door is closed and the cavity is filled with foam.

After finishing installation work you need to wait for the foam to dry completely. The excess can be trimmed off, and then the platbands can be installed.

Self-installation of interior doors does not require complex steps. To resolve this issue, it will be enough basic knowledge and repair skills. Do-it-yourself door installation allows you to save money cash, since you will not need to pay for the work of specialists.

Preparing for work

Installation of an interior door may be required during renovation work. The procedure is not as scary as it might seem at first glance.

Necessary tool

Installation new door is carried out in several stages. As a rule, it is necessary to remove the old canvas, and then proceed to install the new one. Upon completion of the work, it is necessary to secure the extensions (if necessary) and platbands. During the process of replacing the blade, you may need various instruments- both manual and electric. Depending on the type of work performed and the accessories used, their list may differ.

The list of tools for replacing the door will depend on whether the frame needs to be dismantled, as well as on the selected fittings

Table: tools for installing interior doors

Drawing up a work plan

To replace an interior door, you should know how to measure the opening to order or purchase a product according to the specified parameters. Correct measurement involves taking the following indicators:

First of all, measure the width of the door. A standard opening in most cases is designed for a door of 80 cm. The easiest way to find out this size is to measure the distance between the vertical supports near the floor using a tape measure.

To obtain more accurate indicators, measurements should be taken from above and in the center.

After determining the width, you need to measure the height doorway. It is approximately 210 cm. To find out exact value, it is necessary to determine the distance from the floor to the top of the opening. If the floor is to be finished, it is recommended to install a new door after laying the material on the floor. In this case, there is no need to take into account the thickness of the finish or adjust the door components during the installation process. Doorway height is measured at several points, but the main reference point is the center. Measurements are taken inside the passage.

To determine the height of the doorway, you need to measure the distance from the floor to the top of the opening with a tape measure.

The width of the opening is determined in a similar way, taking into account that the door structure (opening) should be several centimeters smaller to ensure technological gaps. In order for the door to move freely, there must also be small gaps between it and the frame around the perimeter.

The width of the opening is determined by the distance between the two sides of the passage

Between the door leaf and the door, a gap of 5 mm is left on all sides, and 12 mm at the bottom.

Table: dependence of the leaf size on the width of the doorway

An important parameter for the smooth installation of a door is the evenness of the doorway. Verticality is checked using a plumb line or level. Measurements are taken in the center, left and right. Next, using a tape measure, measure the diagonals - the distance from the top corner of each side to the opposite corner from the bottom. They should be the same or at least not have significant deviations.

In addition, before you start replacing interior doors, it is recommended to draw up a drawing on which to record the measurement results. This will speed up the work.

How to choose a new door

When the need arises to select a new door, take correct solution Because of the variety of models, it is sometimes difficult. By appearance the doors look perfect, but there may be serious flaws inside. It's all about geometric parameters. If the door leaf has deviations of at least 1–2 mm from the values ​​obtained as a result of measurements, this may complicate its installation. To avoid unnecessary time spent on rework, it is recommended to measure the canvas in the store. It is also important to ensure that the exact door from which the measurements were taken is loaded and delivered. On next stage you need to select a door frame. Most often it comes complete with the door, but sometimes it is selected separately. Installation door design can be simplified if you purchase all the elements from one manufacturer. Then there will be no need to adjust one part to another.

Installing a door in an old frame

Sometimes there are situations when you need to replace a door without a frame. To do this, you will need to remove the old door leaf, adjust the new one to the parameters, secure the fittings and install the product in place.

Removing the old door

The hinges on which the doors are attached are different. Therefore, dismantling the canvas can be done in different ways. The canopy structure has two parts, one of which is attached to the door, the second - to the hatch. Some awnings have an axle fixed inside one of the parts. If you need to dismantle a door with such hinges, install a pry bar or some other lifting device and, with some effort, lift it. The work is best done with an assistant who will support the door at the right moments.

If the hinges can be separated along the axis, to remove the door it is enough to slightly lift the leaf

There are other hinge options where the axle fits into both sides of the canopy and is inserted through the top. To remove a door with such elements, you will need to remove the rods. The upper part of the pin has a kind of cap, which you pry off with a screwdriver and try to remove the element from the loop. It is best to start the procedure from the bottom canopy, which will prevent the door from falling, which could result in tearing out part of the hinge attached to the hinge. Damage should be especially avoided if the box has normal condition and its further operation is planned. After removing the door from the opening, the fittings are removed from it.

To remove the door from the hinges on a separate axis, you must remove the limiting cap and remove the axis

Fitting a new canvas

Replacing a door without a frame involves adjusting the new product to the old dimensions. To do this, the new product is placed horizontally, and the old door is placed on top. Both canvases are aligned along the top and long side, where the handle will be attached. If the new canvas has big sizes, you will need to remove the excess. Use a pencil to draw a line according to which from the new door circular saw cut off the unnecessary part.

The new door is adjusted to the size of the old one, cutting off the excess parts with a circular saw

Installation of fittings

After adjusting the new product, it is necessary to mark the places where the hinges will be mounted. This is done in the following order:

1. We put the old canvas on top of the new one, combine them with each other and with end side For the new door, we put marks with a pencil in the places where the hinges are installed.

   On the door leaf we mark the location of the hinges with a pencil

2. Use a construction knife to make clear lines.

   Clear marking lines can be made with a sharp construction knife

3. We select the recesses for inserting the hinges with a chisel. To do this, we place the door on the end so that the side where the awnings will be located is facing up. Place the chisel on the line and strike the handle with a hammer. The sharpened edge of the tool should enter the material no more than 2–4 mm, depending on the thickness of the metal of the hinges. These actions remove the excess layer of wood.

   The recess for the hinges is cut out using a chisel

4. We position the hinges so that the flat part is flush with the end of the door.
5. When the part clearly fits into the selected recess, use a small-diameter drill to drill sockets through the holes in the canopy for easy screwing of the fasteners.

   To make it easier to screw in the screws, pre-drill the holes with a small drill.

6. We fix the hinges to the door with self-tapping screws, after which we try on the canvas to the opening door frame. By trying on, you can determine the size of the gaps and how accurately the product fits into the passage.

   The hinges are attached to the door with self-tapping screws using a screwdriver or screwdriver.

Video: inserting hinges with a chisel

After installing the hinges, you can begin making seats for locking mechanism and handles:

1. The location of the fittings is marked by old door. It is important that all measurements are accurate. Otherwise, the hole will have to be moved, which will spoil the appearance of the door. If an old locking mechanism is used, all necessary parameters can be measured using the old door.

   On the new door we mark the lock according to its location on the old door

2. We drill holes from the end with a feather drill.

   Drill a hole for the lock from the end of the door with a feather drill

3. To make holes on the main surface of the door, we use a hole saw of the required size.

   We make a hole for the lock on the main surface of the door using a hole saw

4. After drilling, install and secure inner part lock with a latch, and then install the handles.

   After drilling the holes, install the lock and handles

Installing a door in an opening

The door is lifted from the floor to the required height and a piece of board is placed required thickness. After this, the canopies are combined and the pins are threaded through them, first into the upper part, and then into the lower one. When using loops of a different design, the hanging of the canvas will occur in a different way. The work is best done with an assistant, since the axles in the hinges installed on the door must simultaneously fall into the holes located in the mating parts on the door.

Installation of the door together with the hatch

If during the process of renovating an apartment or house it was discovered that not only the door leaf, but also the frame needs to be replaced, then the entire door set will need to be dismantled.

Removing the old frame and door

To remove the old door frame, you will need the following list of tools:

• mount;
• hammer;
• axe;
• hacksaw.

To dismantle the door hatch you will need an axe, a hammer, a hacksaw and a pry bar.

We remove the door frame in the following sequence:

1. We remove the door.
2. We dismantle the platbands. To do this, we drive the ax between the frame and the cashing and press the casing from the box.

   To remove the casing, just hammer an ax between it and the box

3. In the resulting gap you can see the nail that secures the casing. We place the ax under it and push the casing as far as possible. We move on to the next fastener and repeat similar steps. As a result, we remove the bar. To remove the remaining platbands, we carry out the same steps.

   Place the ax under the nail and move the bar away from the box

4. We dismantle the door frame. It is fastened with nails 150 mm long. If we managed to find the place of the lower fastener, measure 20 cm upward from it. Otherwise, we retreat 80 cm from the floor and saw the support.

   We retreat 800 mm from the floor and saw the door frame

5. We insert the ax above the cut point into the gap between the wall and the hole and try to move the support inside the passage. This way we remove the nail that holds the post up.

   Use a pry bar to move the vertical part of the support above the cut site

6. Similarly, we dismantle the remaining lower part of the support.
7. Remove the top of the box. To do this, we drive the ax between wooden element and the opening, then move it down.

   We dismantle the upper part of the box using an ax, pushing the beam down

8. Using the same steps, we dismantle the remaining vertical support.

Door frame assembly and installation

The door frame can be assembled from profiled timber or MDF. The assembly process is independent of the material and consists of the following steps:

1. We measure the parameters of the opening. To install the box, you need to provide a gap of about 3 cm. Using a hydraulic level, we control the horizontal level of the floor in the corners of the door opening.
2. We trim the box elements with a circular saw.

   Trimming of elements is carried out with a circular saw

3. We mark the horizontal beam of the box, for which we install it on top of the door with a gap of 2–3 mm and apply marks with a pencil.
4. Place the door on its side and mark the position of the hinges. It is recommended to install them at a distance of 200 mm from the top and bottom of the canvas. We measure this distance, attach the canopies to the markings and outline their position along the length.

   Place the door on its side and mark the installation locations for the hinges.

5. Mark the place where the loops on the loot will be located. To align the parts, place a vertical frame support on the side of the door and measure a distance of 10 mm from below for the gap between the floor and the door itself.

   To mark the position of the loop on the loot, you need to attach the element and outline it with a pencil

6. We cut the elements of the box according to the marks.
7. We cut down the door frame boards at an angle of 45˚.

   Door frame boards are sawed at an angle of 45˚

8. We select recesses for the canopies using a chisel or a router.
9. To hide the heads of the self-tapping screws that will secure the piece to the wall, we make recesses for them under the hinges. For these purposes we use drills suitable diameter and make holes for the countersunk.
10. To assemble the box elements, use a 5 mm drill to make holes in the right support and in the left corner of the top bar. The holes must be drilled at an angle of 90˚ to the trim surface to ensure that the elements are pulled together when the fasteners are tightened.
11. We join all the parts of the box to each other with self-tapping screws 40–50 mm long.

    We connect the elements of the box with self-tapping screws 40–50 mm long

Video: how to assemble a door trap

After connecting the frame elements, you can install it in the opening. To do this, perform the following steps:

1. Carefully install the door frame into the passage and temporarily fix it with cardboard, which we place between the door and the wall. Using a level, we check the verticality on the side where the hinges are installed. To accurately position the door frame and adjust the gaps, you will need wedges made from wooden blocks with different angles.

   To accurately position the box in the opening, it is necessary to use wedges

2. We install wedges in the places where the hinges will be located. This is where they will be installed fasteners Lutki. To more securely hold the structure in the upper corners, we additionally hammer in a wedge. The box must be installed flush with external wall rooms. It is necessary to ensure that the wedging elements do not extend beyond the surface of the wall.

   Wedges are installed at the locations of the loops

3. We fix the box through the prepared holes, and it is important that there are wedges in the fixation areas that will prevent the box from deforming.
4. To ensure the stability of the structure, we partially foam the gaps between the walls. From the side of the lock for fixing vertical stand We use foam only in one place, since the support will still have to be moved.

   To make the door frame more stable, the space between the wall is filled with polyurethane foam.

5. We attach the fittings to the door. Having placed a block of the required thickness under the canvas, we first attach the upper and then the lower hinge to the door frame. We close the door and accurately align the front side of the frame using wedges.

   Having placed a block of the required thickness under the canvas, we first attach the upper and then the lower loop to the box

6. We foam the gaps between the wall and the frame on each side.

To avoid swelling of the elements, it is recommended to install spacers between the vertical supports using any available materials.

Since door hatches are sometimes installed with a threshold, you should consider assembling such a design. Box elements can be connected not only at an angle of 45˚, but also at 90˚. In addition, a right angle provides a more reliable connection.

Video: installing a door frame and leaf

All preliminary procedures until the moment of assembly have virtually no differences from installing a door frame without a threshold. The rest of the process is as follows:

1. We saw off a horizontal block to a length equal to the width of the door, and add 6 mm for gaps on both sides of the frame.

   We saw off the horizontal part to a length equal to the width of the door leaf plus 6 mm for gaps on both sides of the frame

2. On the vertical supports, remove the protruding quarter. Also, do not forget about the gaps on both sides. To make a quarter sample, you need to attach the upper transverse element to the end side of the vertical support and mark the width as accurately as possible. Following the mark, we saw off the protruding quarter to a depth with a jigsaw, equal to height quarters.

   Remove the protruding quarter on the door leaf with a jigsaw

3. Using a chisel, remove a quarter from the end side of the vertical supports. We repeat a similar procedure on all sides of the structure.

   Using a chisel, remove a quarter from the end side of the vertical supports

4. We place all the components on a flat surface and connect top part. It is recommended to first make holes in the frame with a small drill for self-tapping screws.
5. Before assembling the threshold, we check the correct dimensions and location. For these purposes assembled frame Without a threshold, we place it on a flat surface and try on the door. We mark the position of the hinges and check the gaps. As long as the threshold is not set, the vertical supports can be slightly shifted. We measure the distance again and make corrections if mistakes were made.
6. Cooking seats on the door for hinges and other fittings.

   Preparing seats on the door for hinges and other fittings

7. We fix the threshold to the vertical supports with self-tapping screws and insert the box into the opening.

   The threshold is attached to the vertical supports with self-tapping screws

8. We install the box in the same way as in the case of installing a structure without a threshold.

Installation of extensions

If the wall is thicker than the width of the door, door extensions are used, which allow you to close the wall and visually increase the size of the door frame. To install these elements, you will need to prepare the following list:

• level;
• roulette;
• pencil;
• hacksaw or jigsaw;
• plane;
• hammer;
• sharp knife;
• polyurethane foam;
• fasteners (screws, nails or “liquid nails”);
• additional strips.

Additional strips can be installed in a groove or without a groove, so it would be logical to consider both options.

Installation in groove

If you plan to use extensions, then it is best to purchase a frame for the door leaf with a special slot.

The presence of a groove in the door frame will facilitate the installation of extensions

Its presence will speed up the installation process and will also allow you to move the additional strip, which will significantly increase the accuracy of installation. The process consists of the following steps:

1. We begin installing the elements after securing the door frame in the passage. We measure the distance from the frame to the edge of the wall. Measurement of slopes must be carried out separately and in different places. To the resulting width we add the depth of the slot in the vertical support. The final value will determine the width of the extension.

   It is convenient to take measurements using a construction square

2. Using a jigsaw, we cut the additional strip to the required size.

   Additional strips are purchased with a margin of width, and precise adjustments are made during the installation process

3. We insert the strips into the grooves of the box.

   We insert the additional strips into a special groove in the chest

4. The extension, which is located horizontally at the top, is laid on the side elements.

   The top panel lies on the side panels at a right angle

5. For temporary fixation door trims use masking tape.
6. We fill the voids that have formed between the extension and the wall with polyurethane foam. To avoid extrusion of the planks, we use spacers between them.

   To prevent the extensions from being squeezed out by foam, it is necessary to install spacers

7. When the foam hardens, remove everything that has come out with a knife.

   After the foam has hardened, remove all excess with a knife.

Installation without groove

If the elements of the box do not have a special groove for extensions, they are fastened end-to-end. This type of installation requires precise measurements, as well as careful adjustment of the planks. Installation is performed in the following order:

1. We measure the width of the slopes.

   To determine the size of the extensions, it is necessary to measure the width of the slopes

2. We make extensions of the required width. If after cutting the width turns out to be slightly larger, remove the excess with a plane.
3. We paste over the sections edge tape, heating the edge with an iron until the glue melts and the tape firmly adheres to the bar.

   To keep the edges of the nails sharp, cut off the heads with side cutters.

4. We put the extras in place. First we mount vertical element, pressing it firmly at the bottom and tapping it with a hammer to drive the nail into the vertical support of the box. Then we attach the middle and upper parts. It is necessary to avoid the formation of gaps between the elements and the frame.
5. We place the transverse strip on top of the vertical ones, measure the right angle and nail it with a hammer to the top of the box.

   Horizontal extensions are installed on top of vertical elements

6. We also fill the gaps between the planks and the wall with foam.

Video: installation of door panels

Installation of platbands

When the extensions are secured and the polyurethane foam has hardened, install the platbands.

Platbands are decorative finishing door passage, which is a shaped profiled overhead strip.

To install platbands we perform the following steps:

1. We measure the height of the side elements. We also add the width of the casing in the upper part to the height of the doorway.

   The side strip should be higher than the border of the doorway by the width of the casing in the upper part

2. We cut off the top of the right casing at an angle of 45˚. We do this so that the edge of the plank adjacent to the extension is shorter. At the same angle, but only mirrored, we saw the left plank up.

   It is better to mark the top element locally

3. We file the casing at both ends at an angle of 45˚.

   The ends of the platband are filed in a mirror image

4. We join the cashing elements and fix them with 5–6 nails for vertical planks and 2–3 for horizontal ones.

   It is advisable to bite off the heads of the nails to make them less noticeable

When using self-tapping screws as fasteners, you will need to drill holes for the head, and after screwing them in, hide the heads with decorative plugs.

When installing platbands from below, there is no need to leave a gap under the baseboard

The lower part of the platbands rests on the floor, and there is no need to leave a gap under the baseboard.

Video: how to install platbands

You can replace the interior door yourself, but it is better to do it with an assistant. Professionals for similar works use a wide range of tools. However, for a one-time installation, you can get by with a simple list consisting of a screwdriver, a hammer and a chisel with a level. Following step by step instructions, replacing the door both individually and together with the frame will be much easier.