The staircase performs an important function, it connects the levels of the structure to each other. Modern materials allow you to create unusual designs that become a full-fledged functional element and decoration of any interior. The design of the stairs can be selected for any room design.
What is a bowstring?
A bowstring is part of the load-bearing structure of a flight of stairs. It is two parallel beams located at an angle. Between them are steps. They can be mounted in various ways, they are: mortise, slide, on the corners. Correctly mounted bowstring and steps ensure the strength of the structure. That is why they are given special attention. A bowstring is not only a supporting element, but also a decorative component of a staircase. It is decorated with carvings and paintings.
Pros and cons of stairs on a bowstring
The design is classic and is popular:
- Stairs are reliable, durable. Subject to the installation rules, they will last several decades.
- Durable, safe, withstand heavy loads.
- The design is suitable for any style of interior.
Cons: installation requires special skills and experience. The design takes up a lot of space, not suitable for a small room.
Kosour as a variety of bowstrings
Kosour is a bearing part of a flight of stairs. It is a beam in which comb protrusions are prepared, steps are mounted on top of them. In the staircase you can mount one braid (located in the middle) or two braces (on both sides of the structure).
Advantages of stairs with a kosour:
- The design is compact, it looks lighter than a ladder on a bowstring.
- Withstands heavy loads.
- Installation requires less floor space.
- The installation process is simpler, takes less time.
Ladders on a bowstring and Kosoura are of several types:
- Attached. The simplest design. It can be made with your own hands. It consists of two beams and steps located between them. The stairs are used in summer cottages, in private houses. She plays the role of a stepladder, easily moves to the right place, compact. It is made of metal or wood. It is not safe to climb such a ladder; she can go at any moment.
- Folding, attic. The staircase has several sections. Their number depends on the required length of the structure. The bowstring folds several times. The ladder is safer than the attached. It is light, takes up little space in the open, and is invisible when folded. Folding systems have drawbacks: they do not support heavy weight, you need to hold on when climbing and lowering, usually such stairs are steep. Types of designs: telescopic, sliding, folding with a spring mechanism.
- Marching. The most common (classic) type of stairs. They consist of two parallel guides holding the steps forming a march. Balusters and railings are mounted on bowstrings. The construction is solid, reliable, but heavy and bulky, suitable for large rooms.
- Screw. The most unusual staircase. It looks impressive, takes up a minimum of free space. A kosour or bowstring is located on the outside. Such a staircase is produced in factories. It is impossible to make it yourself, you need special equipment to create bent and twisted shapes.
The ladder of any design is made of durable high-quality materials, it must withstand heavy loads, ensure safety.