Well      08.03.2020

Overlapped array. The choice of material for interior doors. Decorative natural wood and its advantages

Our main products are solid oak and beech doors and stairs, as well as furniture. An array is called such elements of a product that are made with a continuous filling of natural wood, usually of valuable species. Massive elements of products, most often, are made of re-glued array. This technology is the most modern. Re-glued mass is blocks of well-dried wood joined under pressure, selected in such a way that the direction of the fibers in each layer is different. This technology allows, in the future, to avoid deformation of the product. All products are glued to the German glue Rakol and Lignum, which ensures their high reliability.
Schemes for connecting bars in a re-glued array can be very different. We are looking for the most best option, which would give the entire structure the necessary rigidity, and, at the same time, would be technologically advanced. From an array can be executed as all structural elements canvases, as well as its individual parts. Most domestic and foreign manufacturers line the door panels with 0.7 mm thick veneer. Instead of veneer, we line the board with a 6 mm thick lamella, which increases the reliability and durability of our doors. Our experience shows that the quality of solid wood doors is determined by:

  • preparation of feedstock (time and drying technology);
  • array plywood technology (glue quality, temperature, pressure);
  • top coat(quality of varnish, number of layers).

You can also create your own unique design various furniture - in size, mood, character and even for any interior. The presented products are only a small part of what we have done and implemented. Our masters will make all your ideas and thoughts come true. Furniture to order is an opportunity to express yourself, to make the environment more pleasant and harmonious. Choosing furniture to order, you will be sure of its uniqueness. We each have our own taste and preferences. We do not want to be like others, so we strive to choose exclusive and unique things, including furniture that can emphasize our style and character, create a mood, and decorate our lives.
The interior of our house reflects our inner world. In order to live in harmony with yourself, it is necessary that the furnishings of your home be as individual and harmonious as you are.

Our specialists carefully control the entire technological process from drying raw materials to final assembly. finished products. We use only the best and proven materials, so the quality of our products can be trusted.

From ancient times at the door was special role in human life: they were the transition from the public to the private world, and vice versa. Initially, doors were made of wood, since this was the first construction material, which our ancient ancestors learned to use in their needs.

Modern door frames and leafs from different manufacturers have different design solutions and their own characteristics. All interior doors are divided into two types - panel and paneled.

Today, buyers are more attractive doors with paneled doors. These doors have the highest cost and rather complex production technology. The unusual lightness of doors with paneled leaves is achieved by a special frame construction, and the design variety depends on the quality of processing of the panels.

What are panel doors made of?
The sashes are made of strapping bars that form the frame, intermediate panels and bars. The lowest strapping bar is solid (and may consist of several bars of smaller thickness), thick. Sometimes a plinth is attached to the lower strapping bar (like a protective board). The door is considered stronger if it has a large number of panels and mullions, and naturally, the cost of such a door increases proportionally.

Paneled door assembly. The panels are inserted into special grooves in the strapping bars and the mullion. They are smooth, floating, with a figure, with a frame, with embossed slats (moldings).

What are patio doors made of?
The door leaf is assembled from the so-called "linings", and the frames from the shield and bars. Panel sashes can be frame (frame + vertical and horizontal bars + stiffening bars) and solid (from solid wood).

Solid ones are made from natural wood (massifs of valuable species) by the method of continuous filling, or by the production technology from a re-glued array. Doors can be solid and also with glazing.

What is a remapped array?
These are carefully dried blocks of wood and then pressed under pressure, using a special glue. The direction of the fibers in subsequent layers should be opposite to that in the previous one. This allows you to achieve good strength and prevent deformation of the door leaf during operation. Doors made of re-glued solid wood and paneled doors are less sensitive to damp conditions in the room due to the use of transverse elements.

What affects the quality of solid wood doors?– Preparation of raw materials, drying technology, wood drying time, solid wood plywood technology (temperature, pressure, glue quality); topcoat (number of layers of varnish and quality of varnish).

Three advantages of wooden interior doors is strength, environmental friendliness and durability.
Based on site materials


Choosing an interior door is a very responsible matter, because. There are many parameters and criteria to consider when choosing a door.

One of the main parameters choosing an interior door is the material from which it is made. Various materials used for the manufacture of modern interior doors are able to satisfy the needs of everyone who cares about their internal comfort. From what material the door is made, will depend on how free and comfortable you will feel in your home.

This article will help you understand the variety of materials used to make interior doors, as well as determine the type of material that is right for you.

By type of material used interior doors subdivided into:

  • wooden;
  • masonite;
  • plastic;
  • glass;
  • aluminum.
Wooden interior doors.

Wooden interior doors are made from solid wood. It can be an array of both precious wood species and cheaper coniferous species, treated with stain and varnished, or with a tinting antiseptic that imitates various types of wood. Moreover, staining can be done on your own, which will significantly reduce the cost. door cost.

Doors made of solid wood can be both blind (solid and paneled), as well as with glazing.

Modern solid wood doors are made from glued beams. Such door type is called a glued array.

Re-glued array is a well-dried wood bars, interconnected with a special glue under pressure. The bars are selected in such a way that the direction of the fibers in each layer is different. This technology allows you to make the door leaf more resistant to changes in temperature and humidity.

Each manufacturer has his own schemes for connecting bars in a re-glued array.

To the benefits wooden interior doors can be attributed to their strength, environmental friendliness and durability.

Among the shortcomings, one can note the natural sensitivity of the tree to the humidity conditions of the room. But this shortcoming can be minimized by observing following rules:

  • you need to buy only well-dried and properly prepared doors (this can be achieved by buying doors in stores that value their reputation);
  • before the direct installation of the doors, let them first settle in the room (at least a week);
  • panel doors and doors made of re-glued solid wood are less sensitive to the humidity conditions in the room due to the use of transverse elements.

Wooden interior doors will create in your


Most often, solid wood doors are elite classic swing doors.

There are also inexpensive solid wood doors. conifers trees.


A door made from an array of valuable tree species can be a work of art.


Masonite door in section.

Various types of masonite door fillers.


Masonite doors are not very durable.


There is a huge variety of masonite doors both in form and finish.

at home, a feeling of stability, reliability, warmth, prosperity and home comfort.

Masonite doors.

Masonite doors got their name from the Canadian parent company Masonite, which gave the world of construction and repair such door type. Today, such doors are produced all over the world using Canadian technology.

Masonite doors are a frame with filler, sheathed with fiberboard, on which a decorative finish is applied.

The frame of such doors is made of inexpensive coniferous wood, most often pine, with reinforcement under the lock. glazed masonite doors they also have an internal frame corresponding to the size of the inserted glass.

Aggregate masonite doors there are three types:

  1. Paper honeycomb filler, which is an "accordion" of paper with a cell of 5 to 15 cm and a paper thickness of about 0.3 mm. This is the cheapest filler, which is most often used in the manufacture of masonite doors.

The advantages of masonite doors include their resistance to changes in humidity, light weight and low price.

Among the shortcomings can be noted insufficient strength door leaf.

  1. Block small-hollow filler is a cut of coniferous bars with alternating voids. Compared to Masonite doors with paper honeycomb, these doors are stronger but heavier.
  2. Honeycomb fiberboard is a lattice of fiberboard plates 32mm high and 3.5mm thick. Doors with such filler are 7 times stronger than doors with cardboard filler, and lighter than doors with bar filler. The price of such doors is correspondingly higher than doors with the above fillers.

Fiberboard panels are attached to the frame, which can be either smooth or paneled.

As decorative finishes masonite doors may be covered:

  • PVC film (laminate);
  • veneer from valuable wood species;
  • primer (for painting);
  • paint, toning.

To the general benefits masonite doors include their environmental friendliness, strength (except for doors with paper honeycomb filler), resistance to changes in the temperature and humidity conditions of the room, light weight and low price with an outwardly attractive appearance.

Among the shortcomings, one can note the low strength of masonite doors with paper honeycomb filler, as well as the low wear resistance of such doors.

masonite doors are the most common type of doors, which, thanks to a variety of decorative finishes, can satisfy the taste of any consumer.

Plastic interior doors.

Plastic interior doors are made from polyvinyl chloride (PVC). Most often, PVC folding doors are made from accordion and sliding sliding doors. Today, however, uPVC swing doors are becoming more and more popular. Just like masonite doors, plastic interior doors can be clad in a variety of decorative finishes such as laminate or even veneer.

First of all, plastic folding And sliding doors have a low price, do not require special care and are not subject to changes in the temperature and humidity conditions of the room. PVC swing doors also have good heat and sound insulation properties, which is why they are often used in kitchens, bathrooms and toilets.

Plastic interior doors


Plastic swing doors are also very diverse.

Plastic is the main material for making folding doors.

Glass swing door. I came to apartments from shops and offices.

Glass doors can be very beautiful.

Most often, sliding doors are made of glass.

Sectional aluminum door.

Sliding doors aluminum is also not uncommon.

The hinged door made of aluminum with a wood finish fits well into the design of modern apartments.
this is the choice of those who are not embarrassed by the use of PVC in the interior of their home.

Glass doors.

The use of glass interior doors in residential areas is becoming more widespread. This is due not only to their beauty and exquisite design, but also to their strength and durability. Glass doors are made of special glass, which is very difficult to break.

There are three main types of glass that are used to make glass interior doors:

  1. Matolux is matte strained glass, which does not allow you to see the interior space of the room, but at the same time lets in enough light (more than triplex). Matolux glass is five times stronger than ordinary glass.
  2. Triplex consists of two sheets of glass and a thin plastic film between them. This type of aggregate is absolutely smooth, which makes it easy to care for.
  3. Tempered glass is tempered glass, the strength of which is 5-10 times higher than ordinary glass. Even if such glass breaks, it does not form sharp fragments.

Glass doors are ideal for small spaces, because they visually increase it. Rooms become brighter, and its boundaries visually expand.

The design of glass interior doors can be different: transparent or tinted glass, frosted, with an ornament or pattern.

Most often, sliding doors are made of glass, less often hinged and pendulum doors. The door frame for such doors is most often made of aluminum.

Glass doors are made to order by specialized companies. Thanks to this, it is possible to manufacture them in almost any size.

Glass interior doors are hygienic and water resistant, making them perfect for kitchens and bathrooms.

The disadvantage may be the rather high cost of glass doors.

Glass doors are suitable for those people who love a lot of light, space and constant communication, because. glass does not give a feeling of reliability and warmth.

aluminum doors.

Modern aluminum doors are made from anodized aluminium.

Anodized aluminum is a high quality aluminum profile that has been electropolished and then colorless anodized.

This is an environmentally friendly material that is not subject to deformation during changes in the temperature and humidity conditions in the room. Such doors do not lose their excellent operational properties for many years.

Aluminum interior doors can be solid or with glass inserts. If desired, these doors can be painted.

aluminum doors ideal for interiors of apartments designed in Hi-Tech style. Such doors will give the room lightness and elegance.

In the photo gallery below, you can more clearly see interior doors made of various materials.

In this article, we examined the main materials from which modern interior doors are made.

The next article will consider the types of materials for decorative interior doors.

from open sources on the Internet.

It is important for every home owner to equip all rooms with special comfort. Equally important here is given to interior doors. They serve not only to conditionally determine the boundaries, the doors unite all the rooms into a single whole. Therefore, their color, material should be in harmony with decor elements and furniture. The article will focus on solid wood doors.

Types of interior doors

The production of door panels and their components is carried out according to modern technologies using various materials. Diverse execution is able to cater to the needs of any person. The door must be fully consistent with its purpose, but at the same time go well with interior decoration rooms. It doesn't matter which model you like - the main thing is that all the doors are in uniform style. Otherwise, heterogeneity will lead to disharmony, a violation of the integrity of the interior.

Masonite doors. The Canadian company Masonite is the ancestor of these doors, from which their name came. The design is a kind of sandwich, where front sides are made of fiberboard sheets, but there are 3 types of “stuffing” between them: with paper, bar and fiberboard filler.

  • Plus. Ecological purity. Attractive external qualities. Low cost. Relatively good performance.

  • Minus. Low strength, especially for paper-filled doors. Low wear resistance.

Plastic doors. Polyvinyl chloride makes it possible to manufacture doors various forms and in any color scheme. PVC products are undemanding in care, resistant to temperature changes and changes in humidity in the room.

  • Plus. High strength. Resistance to microclimate changes. The price corresponds to the declared technical characteristics.
  • Minus. The level of environmental cleanliness is questionable.

Glass doors. Doors made of such material are widely used due to not only exquisite design, but also high strength characteristics. Despite the apparent fragility, it is very difficult to break such a canvas. Three types of glass are used for manufacturing: matolux, triplex and tempered glass.

  • Plus. Visually enlarge the room. Not afraid of moisture, temperature changes. Made to order.
  • Minus. High price. They do not give a feeling of warmth and reliability.

Doors interroom from the massif. Particularly noteworthy are canvases made of solid natural wood. Production is carried out both from rare, valuable species of trees, and from quite cheap wood. The canvas can be deaf or have a glass insert.

Solid wood door photo

The overlaid array is a subview wooden doors. The production technology consists in gluing wood bars under pressure. Each manufacturer has his own lumber layout. The calculations are based on numerous strength tests. Thanks to this technique, the canvas is not subjected to deformation.

  • pros. Absolute harmlessness. Reliability and durability. Respectable appearance.
  • Minuses. The high price of solid wood doors.

The choice of interior doors according to the method of opening

Solid wood doors are classified according to many criteria. First of all, when choosing, you should decide on the material, and then on the method of opening them. From the design of the door depends on how comfortable and functional their operation will be.

  • Solid wood swing doors. Common view. These doors open in one direction only. They can have either one or two canvases. Sometimes the sashes differ in size. Swing option not suitable for rooms small area, after all open doors occupy some space and can interfere with free movement.

  • Pendulum doors. Thanks to special fastening open on both sides. These doors are designed for spacious rooms, since when opening you need free space both on one side and on the other. Cloths for such fasteners should be light, so solid wood is not used here.
  • Sliding doors. They are opened by sliding the canvas (cloths) along the guides. The design is relevant for small rooms, space is especially saved if the "rails" are installed inside the partition. If such doors are mounted after construction works, then you need external guides. Basically, the door frame is made of aluminum or PVC profile, safety glass with a decorative coating acts as an insert.

  • Folding doors (accordion). Significantly save space. The design consists of several narrow panels that fold like an accordion when opened. Sliding is carried out along the upper, sometimes lower guides. Panels can be deaf or with stained glass inserts. The frame is made from different materials.
  • stable doors. Type of swing doors. Here, the doors are not divided vertically, but horizontally, where each has its own fasteners and locks. This version of the doors is installed more often in private houses, so the lower leaf does not allow living creatures to penetrate from the street, and the upper one serves for ventilation. Usually the lower part is deaf, and the upper part may have a transparent insert. In apartments, stable doors are rarely mounted.

Types of wood for solid wood doors

Aesthetic and performance characteristics depend on 2 things - the production process and the wood itself. Each breed has distinctive features, the manufacturer can only enhance the unique properties or minimize their negative sides. As a result of the "tandem", the consumer receives a durable canvas with high aesthetic qualities.

Solid oak doors

  • Such wood is synonymous with hardness, strength and steadfastness. Its light pink texture with dark brown veins attracts many consumers. Over time, the product darkens, thereby acquiring a noble appearance.

  • Strength characteristics are the key to the reliability of the door leaf. If oak wood has been properly dried and processed, then such doors will last for decades. Of the shortcomings, only the weight of the product can be noted.

Solid beech doors

  • Its wood is only slightly inferior to oak in terms of mechanical properties. Uniform with a light cream shade, it allows the doors to fit into almost any interior. The array is perfectly amenable to processing and grinding, which makes it possible to produce high quality door leafs.
  • From the point of view of professionals, beech wood is a little "capricious" - it feels a change in the level of humidity in the room. However, if the fabric was manufactured at a large enterprise using expensive equipment in compliance with all technological processes, then no moisture will be terrible for the beech. Solid beech interior doors have the most positive feedback from owners.

Ash wood doors

  • This valuable wood with unique properties is used for the manufacture of canvases along with oak and beech. Strength characteristics surpass even those of oak. The wood is resilient and flexible, which allows it to be used for the production of doors of complex, intricate shapes.

  • Ash offers a wide range of shades - from light to dark. It is known that the most best performance shows wood at the bark than at the core of the trunk. So, light shades of ash wood predominate just at the bark.
  • Products from this breed are not subject to deformation, perfectly respond to temperature changes and high humidity, resistant to mechanical stress, not demanding in care.

Solid pine doors

  • The canvas of pine wood has an attractive texture and pleasant aroma. But low density cannot long time withstand mechanical stress. In addition, pine does not tolerate wet conditions, and therefore, the canvas is not recommended for installation in kitchens and bathrooms. Since all doors must be the same for a harmonious interior, pine door leaves are more suitable for offices than for home.
  • Another disadvantage of this wood is resins that can be released during operation. Therefore, most consumers prefer doors made of solid alder, which always remain "clean".

exotic breeds

  • This category includes trees that grow in tropical forests. Sequoia, mahogany, wenge, ebony - behind outlandish names are hidden: unique strength characteristics, texture of amazing beauty. You can buy interior doors from an array of these types of wood only in elite hardware stores.

Additional elements for solid wood doors

The interior door includes not only the canvas, most of it is occupied by components: platbands, a box, a threshold, accessories, and so on. In the end result, the total cost of the accompanying "little things" can be compared with the price of the door leaf.

  • It is important to remember that the additional elements must be made of the same wood as the door. A serious manufacturer conducts certification of manufactured products.
  • Before purchasing, it is advisable to familiarize yourself with all supporting documents. At the same time, it is not at all necessary to know the regulatory provisions of GOST and SNiP, it is enough that the papers are available.

Solid wood door measurement

Before you go to the store, you need to measure the doorway and based on these data, you can start choosing the canvas. It is advisable to do all calculations only after installation floor covering. In other cases, it is necessary to take into account how much the floor level can rise after completion of work.

  • Opening width. Construction tape measure the width of the opening at least 3-4 points (top, bottom, middle). The minimum value is taken as the basis. If it is possible to correct the wall, for example, locally knock out concrete, brick, or vice versa, apply a little mortar, then here it is quite possible to take the arithmetic mean. In the calculations, the mounting gap should be taken into account - 5-10 cm on each side.

  • Opening height. Height is measured in a similar way (right, left, middle). Do not forget to take into account the level of the floor.

Tip: canvases from domestic manufacturers are produced mainly standard height, that is, 2 meters, which means that the height under the box should be 2.07-2.10 m. At this stage, it is better to refine the opening in height.

It is important to consider whether the door will be with or without a threshold.

  • Wall thickness. This indicator will help determine whether there will be a need for the use of extras. Extensions are panels that are installed in cases where the thickness of the wall is greater than the width of the box. It is worth noting that standard size equal to 7.5 cm.

Highlights when installing solid wood doors

Installation of a box, a door leaf requires not only a skill, but also a special tool for inserting hinges and locks. Doing your own installation work is not recommended. Not every craftsman is able to insert fittings into the canvas, especially from precious woods, where errors often cannot be corrected.

It is worth noting that the doors may have different readiness for installation:

The set includes a box, a platband and a canvas. Fitting the dimensions of the door frame, inserting hinges and locks is carried out independently.

the door door is completely ready for installation, that is, it only needs to be mounted.

  • The gap between the door leaf and the box on the sides and top should be 2 mm, from the bottom about 6 mm, if carpets are provided in the room, then the distance is increased.
  • The canvas, made of solid wood, is mounted on 3 door hinges(top, bottom, middle). For such heavy doors, it is better to use semi-articulated canopies, in which case the removal of the leaf will be easier. 25 cm are measured from the bottom and top of the door, extreme canopies are placed at these points, another canopy will be located in the center, that is, at a distance of 1 m from the top or bottom of the canvas.

Do-it-yourself ways to install a door from an array

There are 2 main methods for installing doors with your own hands. Here you only need to choose the best option.

First way

  • In accordance with the door leaf, a box is assembled. Places are cut out for hinges, a lock and door handle. The block is installed in the opening and fixed with wooden wedges, observing the vertical and horizontal in all planes.
  • Fastening to the wall is carried out by means of self-tapping screws or dowels, depending on what material the wall or partition is made of. In the closed position, spacers are inserted between the canvas and the box, for this you can use fiberboard sheet 2-3 mm thick. The space between the wedges and the wall is filled with foam.

Second way

  • Cut to size canvas door frame, is fixed in the opening with the help of hardware, wedges, foam. After the foam has completely dried, a lock is cut in, sheds are installed. This method is more suitable for light doors, since it will be quite difficult to keep a massive canvas on weight, checking the compliance of all elements.
  • As for the platbands, their joining can be done by cutting at an angle of 45 ° or 90 °. Fasteners are carried out with finishing nails, the absence of hats makes them almost invisible.

Solid wood door care

The factory-applied coating provides reliable protection. But during operation, various situations may occur when restoration work may be necessary.

  • The most common defect is a scratch, which is quite easy to fix. The damaged area is moistened and gently skinned with fine sandpaper. Then soft cloth polishing wax is rubbed in.

  • As a rule, solid wood doors do not require special care. Cleaning is only by special means. Do not use abrasive cleaners, as chemical constituents may interact with the wood, which will cause discoloration and may accelerate natural aging.
  • To remove dust, just wipe the door with a slightly damp cloth. The procedure is repeated with a dry soft cloth to remove wet stains.

Massive doors made of quality wood, with observance of all technological processes will serve for many decades.

| External finishing |

Design features interior doors
The design solutions for both door panels and frames for each manufacturer, as a rule, have their own characteristics. However, despite the apparent variety of designs, they are all divided into two large groups: panel and panel.

Paneled doors
Doors with paneled leaves are the most attractive, but also the most difficult to manufacture, and therefore the most expensive. Due to frame structure, they are lightweight and have the possibility of a variety of architectural processing of panels.
The sashes of paneled doors (Fig. 36 / 1) consist of strapping bars that form the frame of the sash, mullions (intermediate bars) and panels - shields that fill the space between the bars. The lower strapping bar is often made thicker, and it can be single (solid) or consist of several bars of smaller thickness. It should be borne in mind that the stronger the door, the more mullions in it, and, consequently, the panels, however, with an increase in the number of mullions, the cost of the door increases.


Sometimes a protective board - a plinth - is attached to the lower strapping bar.

To fix the panels in the strapping bars and the mullion, special grooves are selected into which the panels are inserted when assembling the door. By the type of connection with the strapping, the following types of panels are distinguished: smooth; with frame; floating; with figurine; with layouts.

Layouts (embossed profile rails) are called in different ways: overhead moldings, moldings or glazing beads.

Panel doors
The door leaf of the panel structure consists of "plates" - a strapping frame made of bars and a shield (Fig. 36/2). Panel sashes can be solid and frame.

With a frame version, the sash is a frame (frame) made of wooden bars. Between extreme vertical or horizontal bars strapping at certain intervals insert the so-called stiffening bars, which do not allow the cladding to sag.

Note that today all doors (regardless of their designs) are often called paneled doors that have panels or imitation panels on the outer panel (for example, doors with molded outer panel And honeycomb filling). Consider the main modern constructive types of door panels.

A large separate group of doors - solid wood doors. An array is called such elements of the door leaf, which are made with a continuous filling of natural wood, usually valuable species. Massive door elements are most often made of re-glued solid wood. This technology is the most modern. The re-glued solid wood is blocks of well-dried wood joined under pressure, selected in such a way that the direction of the fibers in each layer is different. This technology allows in the future to avoid deformation of the door leaf.

Schemes for connecting bars in a re-glued array can be very different. Each manufacturer is looking for the most optimal option that would give the entire structure the necessary rigidity, and at the same time be technologically advanced.
From the array, both all the structural elements of the web, and its individual parts (for example, strapping) can be made.
Figure 38 shows some options for panel doors made of 100% solid wood. The harness is made of two longitudinal layers (Fig. 38A); from three longitudinal layers (Fig. 38B); from two bars and additional strapping (Fig. 38B).
The panel is attached: directly to the harness (Fig. 38 A, B); into the frame, which, in turn, is fixed in the harness (Fig. 38B).

Since natural wood is used in the construction of massive doors, such doors are very sensitive to changes in humidity in the room. Therefore, it is necessary to leave special grooves to compensate for thermal expansion and contraction when installing panels: they are never fixed rigidly, leaving room for play. The more panels in the door, the less the door is subject to temperature fluctuations.

The quality of solid wood doors is determined by:

  • preparation of feedstock (time and drying technology);
  • array plywood technology (glue quality, temperature, pressure);
  • top coat (varnish quality, number of layers).

IN modern designs panel doors, not only natural wood is used, but also various combinations of wood-like materials. The use of these materials eliminates the main drawback of natural wood - hygroscopicity, gives the structure additional rigidity, increases the design possibilities of the door leaf, and also makes the doors cheaper.

Some designs of panel doors are shown in Fig. 39.

With the simultaneous use of different materials in the frame of the door leaf, which have various coefficients thermal expansion (for example, if the strapping is made of solid wood, and the main part is made of fiberboard), special grooves are provided (Fig. 40). They are necessary in order to avoid the appearance of cracks in the leaf, as well as to ensure that the door leaf does not change its size.

The filling of door panels can be different (Fig. 2.6.41): honeycomb; cellular from fiberboard plates; from a chipboard of a tubular design; slats from perforated chipboard, from solid chipboard; from wooden blocks, etc.

Honeycomb filling is made from corrugated cardboard. The strength of this type of door is quite sufficient for an apartment. If you do not specifically strive to break through such doors with heavy objects, then they can serve for years. Doors with a chipboard core with tubular cavities are stronger, solid chipboard doors are even stronger, although much heavier than the first. In addition, such doors have much higher sound insulation rates than honeycomb doors.
The outer panel of honeycomb doors can be smooth, molded (profile-pressed), painted in various colors or finished with wood veneer or laminate. Doors can be deaf and glazed.

Molded panels look like paneled doors, their texture can mimic the texture of wood or be completely smooth.

The door leaf can have a flat edge or a folded edge, both on one and on three sides. The thickness of the door leaf varies from 35 to 45 mm.