Doors in the building are subdivided into internal and external. External doors differ from internal doors, first of all, in their strength and reliability. The expression “My home is my fortress” has not been canceled. The main purpose of the outer door is protection against unwanted intrusion. Its functions also include sound insulation, preservation of the heat of the home. In addition, the outer door is also an element of the facade of the building, so it must be in harmony with its appearance..
In the old days, the entrance to the dwelling was simply covered with a mat. For a long time, the doors were exclusively wooden. But times are changing, and everything is changing, including the doors are being improved. Wood is still in use. In particular, at present, paneled doors are being made, or doors of a strapping structure, consisting of a panel and a strapping. Panel doors with continuous filling of the leaf or fine-void, are used as external ones only when they are covered with a moisture-resistant finishing material.
In addition to wood, the industry produces steel external doors, reliable, durable, capable of ensuring the safety of the home. Steel doors are also used as entrance doors to apartments. The only difference is that the outer ones are covered with moisture-protective agents.
Glass external doors are now increasingly used. Tempered glass up to twenty millimeters thick is used for their manufacture. The technology of production of this type of glass increases its strength several times, thanks to which it provides a high level of security for external doors made of it. Such doors are equipped with an automatic opening system, electronic combination locks, interlocking kits, latches with remote control.
External doors can be made of aluminum profiles. This is a high corrosion resistance, it is lightness, strength, durability. Doors from an aluminum profile perfectly fit into the design of a building, they are easily integrated into facades from a system profile, harmoniously combining with other materials. In a long service, they are facilitated by the type of locking fittings and hinges applied to them. The front door is superior in decoration to all others. Doors from the back door are made as less noticeable as possible: they are painted so that they merge with the tone of the walls of the house.
