The interior door is always in the fieldvision, therefore, its installation must be performed without the slightest flaw, so that every time you open or close it does not remind you of yourself. As or with the help of hired workers, everyone must decide for himself. However, to have an idea of the progress of the process is necessary at least in order to control the work of the wizard. 
Interior doors should be a beautiful and harmonious complement to the interior.
Types of doors and boxes for installation
Before installing the interior doors,should determine the choice. Now the market offers a lot of options for doors, different in terms of material execution and design. From the point of view of technology for installation, the material from which the door leaf, the box and the additional elements are made is most important. 
Types of interior doors by the way of opening. According to the design, interior doors are distinguished:
- made of solid wood;
- panel (frame) doors.
The frame of such a door is made of bars andlined with sheets of fiberboard with subsequent finishing. By filling, such doors can be hollow or filled with short lengths of bars. The box and additional elements can be made of solid wood or MDF with various variations of decorative finishes (paint coating, lamination or untreated mass). Different material of the performance will dictate various technological methods of work when installing the door leaf. Back to contents</a>
Basic fixing methods
Classification of interior doors on variousfeatured. It is possible to distinguish several practical methods that allow to install a modern interior door, each of which has its advantages or disadvantages. The most reliable option for securing the box in the doorway is by means of dowel-nails of sufficient length or anchors. Vertical bars are drilled through and rigidly connected with fasteners to the wall. The disadvantage of this method of fastening is that on the surface of vertical racks there are visible attachment points. Disguise the fastening heads by installing plastic decorative plugs of suitable color. A more radical, but more expensive variant of masking fasteners is the use of a box with a groove for the installation of fasteners and a liner, which this slot closes at the end of the work. Less costly, but also less reliable will be the through door fastening through the holes in the hinges and the mating part of the lock. Here, just as in the previous case, rigid attachment to the wall is carried out. Due to the fact that in fact there are only three attachment points, the construction of the door frame will withstand less strain without deformation. But here it is not necessary to hide fasteners. He camouflaged for a regular fastening hardware. 
The construction of paneled and panel doors. Finally, a method that is the least time consuming. In this case, the door frame is exposed in the opening in the required position and fixed with wooden pads. Then all the free space between the beams and the wall is filled with mounting foam. It should be understood that with this fastening, the entire load will be covered by a layer of frozen foam. And if you hang a heavy door, then in time it can shake the joint and even wrest it. With the mounting foam, only light panel doors can be installed. Back to contents</a>
List of tools and consumables required for work
To perform the installation you need a certain set of tools and supplies:
- Hacksaw - for cutting the packing bars;
- electric drill;
- puncher (it is necessary if the material of the walls is reinforced concrete, in all other cases it is basically possible to do with a drill);
- chisel, it will be required for inserting the hinges and door-latch;
- the building level, will help to independently check the correctness of the installation in the vertical plane;
- dowel-nails or anchor bolts;
- mounting foam.
Naturally, to perform the installation works, in addition to all of the above, you will need the details of the door kit: 
Methods of fastening doors.
- door leaf;
- set of beams of the box;
- threshold, if necessary;
- additional elements to inscribe interior doors in the opening with a large wall thickness;
- it frames the installed interior door around the perimeter on the wall surface and closes the gap between the box and the opening.
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Assembling boxes: recommendations
Usually a set of beams that formbox, consists of two vertical posts and one horizontal bar. In some cases, a threshold complements them. Before, it is necessary to fit the parts to the size of the door leaf and the opening where the installation will be made. With a fine-toothed hacksaw, the vertical posts are cut to the desired size at an angle of 45 °. 
The layout of the door frame and the door for the hinges. It should be noted that the angle of cut must be in the upper part of the beam from the side facing the door. Similarly, the upper horizontal jumper is also fitted. It is not necessary to adjust the parts to each other at an angle of 45 °. In general, they can be interfaced at 90 ° with the support of the upper bridge on the vertical posts. This option will be slightly easier to perform than the previous one, although it will yield aesthetically. If it is necessary to set the threshold, it is adjusted to the posts at a right angle. A very important point that can not be overlooked is the accuracy of the fit. Between the beams of the box and the door leaf there should be a gap of 3-5 mm. This is necessary to compensate for possible changes in the size of the door when the humidity fluctuates. In the case of an accurate fit, the jamming effect can result, and then the interior door should be opened with the shoulder. Back to contents</a>
Furniture fittings: features
The scheme of inserting the handle into the interior door. While the box is not installed in the opening, it is very convenient to cut the hinges and locks. The door and the box are temporarily assembled on the floor of the room. A pencil marks the position of the hinges and the door handle-latch. Then all the details are again disconnected and the full arrangement of the hardware is drawn on them. Sampling of surplus material is a very important moment. On how well it will be performed, the smoothness of the door, the presence of creaking and the period of trouble-free operation will depend. If the material of the door and the doorpost is a tree, then the chisel is enough to perform the work on the additive accessories. The grooves under the loops are chosen elementary: along the circumscribed perimeter, an incision is made to the depth of the installation of the loops. Then everything that is inside is simply cut off. The situation with the lock of the castle will be somewhat more complicated. To facilitate the selection of a deep groove, you will need to use a drill here. The diameter of the drill bit installed in the chuck must be slightly less than the thickness of the fittings to be inserted. In fact, the groove under the lock to be installed is drilled into the tree array. The chisel just needs to straighten its walls in order to perform a tight installation without distortions. If the cut-in is carried out not in a tree, but in MDF, the requirements for sharpening the sharpening of the tool are increased several times. This is due to the characteristics of the material itself. MDF, in comparison with wood, is a harder material, but at the same time much less durable. Excessive force applied when selecting slots for hinges or locks can simply crack the work pieces. The best option in this case is to use a hand-held router to cut the fittings. To facilitate the work and improve the accuracy of the grooves at the end of the door and vertical racks will help specialized devices and templates. They can be purchased in advance or manufactured independently from improvised materials. Do not interfere with the milling cutter when working with wood. Back to contents</a>
Box installation: highlights
The scheme provides for the installation of a door leafinto the casing. The safest and most durable way to install a door is to rigidly fix the uprights to the wall in the doorway using fasteners. Previously, the interior door and the frame are assembled and installed in the doorway. Its position is verified by the level. In the remaining free slots, wooden gaskets are installed - wedges. They simultaneously fix the door and prevent the racks from bending when they are fastened. Then the door leaf is removed and the holes for the fastening fittings are drilled. The material of the box is drilled with a drill with an ordinary wood drill. The holes in the wall for the dowels must already be drilled either with a perforator or with a drill with a drill for concrete. In order not to knock down the exposed position, the wall can be drilled directly through the jamb. You just need to take a longer drill. After all the planned holes are drilled, fasteners are installed in them and securely fixed. During the installation of the fasteners, care must be taken not to displace the jamb from its original position. For this, periodic checks of the vertical position of the level are made. , using a hidden rigid mount with hangers for mounting drywall. The suspension is bent in the form of a U-shaped bracket. The jumper of this bracket is attached with self-tapping screws to the uprights from the side of the doorway. The legs of the bracket are fixed to the surface of the bracket with dowels. The use of suspensions makes it possible to abandon the use of wooden spacers, which somewhat facilitates the installation process. The gap remaining during installation between the jamb and the wall is neatly filled with polyurethane foam. When solidified, the polyurethane foam expands and can bend the beams of the box. Therefore, if it is possible for some time not to use the doorway, then it is best to play it safe and install spacers between the vertical posts. After the final hardening of the foam, its excess is cut off with a knife. The installation process is largely complete. Further work is related to the decorative design of the opening: the installation of additional elements and door platbands (windows). As you can see, it is not so difficult, the main thing is not to rush and perform all operations with maximum accuracy.
