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When creating a flight of stairs, it is important to take care of the reliability of fastening it to the bearing walls. One of the relevant types are options on a bowstring. In this case, the structures are located on top of the supporting surface.
The kosour for the stairs is the main beam, which has sufficient power to hold the entire span, can be made of wood, as well as metal.
Depending on what kind of structure will be, and what kind of floor materials will be, the basis may include a different number of elements for a bowstring. Their number can start from 1 and reach 3.
For the manufacture of a wooden version of the product, beech, oak, or maple is used. Step modification is a whole structure that repeats the projection of the span. In the manufacture of load-bearing elements, cuts in the form of a triangle located at the same distance from each other are cut out in the board. The only thing you need to pay attention to is that such a structure has disadvantages, expressed in insufficient reliability, because the beams after cutting become thinner and, accordingly, less durable.
Metal braids are a good substitute for wood. This method is relevant when creating a supporting structure on a single central support. The required fastening of the kosour in this case is easier to choose than in the version with a tree. Auxiliary plates can be attached to the metal.
The basis of the material is mainly steel.The support can be straight or curly, repeating bends.
The calculation of the kosour is based on the shape of the structure, its size, strength and reliability.
Steps on a bowstring are most often used when creating a second floor in cottages or houses.
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