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The second place in popularity, after wooden ones, is occupied by a ladder on a metal frame. It is versatile and durable. If you want to order a ladder on a metal frame, you can get lost in terms, design features and prices. To understand and make a choice, let’s try to analyze the main names and characteristics.

Ladder broken stringer

The frame ladder consists of the following elements:

  • metal base – all the load goes to it and steps and railings are attached. This frame, in turn, consists of:
    • Marches (rectilinear rows of steps).
    • intermediate elements.
      If the staircase is from one march, then it is called the “straight march”. If from two or more marches connected by turning elements (platforms, winder steps) – marching.
  • wooden steps.

Each march consists of stringers (bearing elements – treads are attached to them). The march is attached to the ceilings between floors with brackets or support posts.

Metal frames come in 6 types:

Broken kosour – it is made from a profile pipe, which is cut into blanks and welded. It turns out a complete solid structure that will last for decades, if the wooden steps rot, it will be enough just to replace them. Such a kosour does not require a blank sheathing, risers or additional finishing. Optimal ratio of quality and price. Disadvantages – requires high precision during assembly and vibration when climbing stairs. In order to dampen this vibration, special vibration-damping supports are installed on long marches.

Monokosour – also from a profile pipe, but easier in execution and installation. It also does not require additional finishing and rather low manufacturing cost. It is usually made from several parts that can be easily delivered and quickly assembled on site. Disadvantages – need accuracy when cutting material and welding parts. Requires special equipment. Due to the fact that there is only one pipe, steps can gradually loosen and creak. Vibration when climbing stairs.

bowstring – from a metal sheet cut by laser cutting on a CNC machine. This ensures the accuracy of the dimensions of the stairs. Disadvantages – for installation, smooth, plastered walls are needed so that there are no gaps between them and the stairs. Difficulty in finding the necessary equipment and manufacturer. .

Kosour from the channel and corner (sheathed) – This is one of the most problematic stairs for finishing. Since the frame is made during the construction of the house, it is inexpensive, but not always the master who makes the kosour takes into account the peculiarities of manufacturing for sheathing. As a result, sheathing stairs becomes a very time-consuming process, and the cost of finishing work is often more expensive than the manufacture of a new staircase.

modular staircase – One of the main advantages is low cost and the possibility of mass production, self-assembly. Disadvantages – small treads, since the steps have a standard depth. It is comfortable to climb, but not very comfortable to descend. Basically, modular stairs do not have very high workmanship. Difficulties arise in the assembly, due to the large number of connections and nodes. The need to paint the steps at the installation site yourself.

It is advisable to order a ladder from a master who is engaged only in the manufacture of ladder frames, a narrow specialization and knows all the features and nuances of manufacturing.