Interior door, making out the border betweenrooms, is an important element of the interior of the apartment. Its installation symbolizes the end of the construction (repair) of the house. Therefore, the solution of the issue, like yourself, can be viewed as the final point of long labors. 
Interior doors serve to separate andsound insulation of individual rooms. In fact, there is practically no problem how to install the interior door yourself. It is solved very simply and quickly. The main thing - to decide on the choice of design and fit it into the overall interior of the house.
The concept of interior doors
It is designed to isolate the premises of eachfrom a friend in one house (apartment). It does not require increased requirements for strength and locking ability. Its role is more decorative than protective. Therefore, the design of such a door is lightweight. 
"Pie" of the interior door. The design of interior doors includes a door frame, a canvas, a threshold and an accessories. The following main types of such doors have found application: an array, paneled and panel doors, differing in the design of the door leaf. The array has a door leaf made of solid wood or from tightly assembled beams. The paneled fabric contains a frame, inserts (panels of particleboard or MDF) and sheet decorative coating (veneer, plastic, etc.). The panel board is made of solid or hollow and consists of a frame, a filler and an outer covering. In continuous structures the filler is made of chipboard. In the hollow fabric, filler is used in the form of empty cells (honeycombs), and the outer coating is made of MDF (MDF). In paneled doors, partial glazing is sometimes used. Glass can be of different sizes and types (matt, colored, corrugated, etc.). The door frame acts as a power frame, through which the door leaf is fixed through the hinges. It is made of three strong wooden beams (two vertical bars and one horizontal at the top). The dimensions of the box are selected on the doorway in the wall. To the fittings, which is completed with an interior door, you can include hinge elements, locking elements and handles. Back to contents</a>
Step-by-step instruction: preparation for installing the door
The device is paneled and panel doors. The interior door should be installed when the main work on the construction (repair) of the premises before finishing is complete. The walls of the room must already be plastered and plastered. The main thing is that the works connected with high humidity are finished, and the raw elements are dried. The presence of high humidity can adversely affect the wooden door parts. In order that there is no discrepancy between the size of the door and the height, the thickness of the floor covering of the room must be fully formed. Otherwise it is difficult to finally plan the threshold of the door (bottom of the frame). It is important to prepare a doorway in the wall. It is necessary to check the verticality of the walls of the opening - if the deviation exceeds 1 cm, the necessary layer of cement mortar should be applied and the position of the wall should be corrected. Verticality should be checked with a plumb line. Local wall defects in the form of protuberances should be removed with the help of a bit. The walls of the opening must be level, all small irregularities should be eliminated with putty. Only after finishing all the work with the doorway can you measure the dimensions for choosing the interior door. The size of the door should be 2-3 cm smaller in all directions compared to the size of the opening. When choosing a door, the thickness of the doorway must be taken into account. Back to contents</a>
Preparing the door for installation
The scheme of assembling the interior door. Interior door is better to buy complete with a door frame. If you only purchased a door leaf, then you will have to make the door box yourself. The box is made of a box-shaped wooden beam, which has a specific profile. The required dimensions are determined by measuring the doorway. Preparing the door for installation in the doorway is done on the floor in a horizontal position. First, places are prepared for the installation of hinges (loops). To do this, on the side edge of the door leaf, retreating 20 cm above and below, make rectangular recesses for the hinge flap. The deepening is done by the chisel. The hinges are fastened to the canvas with screws. The canvas is placed in its place inside the door frame and the vertical location of the box marks the location of the colliding canvasses. Using the chisel, the recesses for the loops are made in the marked places on the box. The length of the recess should have a reserve of 10-15 mm compared with the length of the loop web. Next, mark and install the locking hardware (usually a handle with a latch). At a height of 100-120 cm from the bottom on the opposite side of the door leaf, a marking is made to install the handle with the latch. A notch is cut from the end of the blade to install a locking mechanism. A hole for the handle is drilled in the canvas at the right distance. Assembly and fastening of the handle with the latch on the door leaf is done. The cloth is inserted into the box, on the rack of the box is marked the socket for the insertion of the latch of the latch. Back to contents</a>
Door frame manufacturing
Marking of the door frame for the hinges. The door box is made of three beams, forming the letter "P" in the collection. The connection of the side racks at the top is usually done in one of two ways. The first method involves joining the vertical bar with the upper horizontal beam at an angle of 45 °. Fastening of the beams is made by screws. For their installation holes are drilled perpendicular to the cut of the beam. Another variant of the connection is the simplest. The horizontal bar is installed between the vertical bars perpendicular to them, and so that its face coincides with the ends of the racks. Fix the beams with screws from the side of the racks. Preliminary in them drill holes for screws. Back to contents</a>
Door frame installation
To install the interior door yourself, you first need a box in the opening. 
Installation of the door frame in a section.
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Installation of door leaf
Whether it succeeded on its own is determinedfinally, according to the quality of hanging the door leaf. Installing an interior door means ensuring that the doors do not open or close themselves, and that no effort has to be applied when they are tightly closed. In this regard, the hanging of the door leaf should be approached responsibly. After fixing the door frame, only hinges can adjust the gaps between the door leaf and the frame. This important step should begin with the preliminary installation of the leaf inside the door frame. With the help of various pads and spacers, the canvas is positioned relative to the box. The gaps on the side and top should be minimal, but allow the door leaf to enter the box without load. If the need arose, then the increase in the gap can be reduced down to the sill. The door leaf wedged in this way indicates the final position of the hinges in the frame of the door frame. The position of the hinges in height is precisely fixed and marked in the recess of the rack. If the need arises, then it is noted the need to reduce the depth of the excavation due to an additional gasket. The final marking of the installation site of the strip for the handle lock in the frame of the door frame is made. The door leaf is removed again. According to the specified markings, the hinges and the lock bar are fixed with screws in the racks of the box. The door is hinged. Back to the table of contents</a>
Additional operations
In order to finally, it is necessaryperform some additional operations. First, the gap between the box and the wall must be filled with polyurethane foam. For this, all door elements are closed with masking tape. The gap is sprayed with water from a spray bottle. Using an assembly gun, the gap is filled with polyurethane foam around the entire perimeter of the box. After the foam has hardened, the excess is cut off with a knife. Wooden strips (platbands) are fixed to the ends of the door frame. The planks are joined together at the top at an angle of 45 °. It is advisable to cover the surface of the box in the places where the strip is attached with silicate glue. The platband is fixed with nails or screws with small caps. Carrying out all operations allows you to install the interior door yourself. Tool required to install an interior door:
- electric drill;
- Screwdriver;
- Bulgarian;
- level;
- plumb bob;
- pliers;
- bit;
- chisel;
- a hammer;
- screwdriver;
- roulette;
- the meter line;
- hacksaw.
The question of how to install an interior door is solved quite simply. It is necessary to properly choose the right door in size and responsibly approach the matter.
