Do-it-yourself frame for a modular staircase. We make a drawing and assemble a modular metal staircase with our own hands

A staircase, based on only one central stringer, and consisting of separate repeating elements (modules with steps fixed to them), fastened together, can be made independently if desired. In the article we will talk about how to make a modular staircase with your own hands.

The design usually has the form of a semicircle, therefore, it requires enough space for its placement. large area. However, the “air” configuration (both pillars and protruding from the wall (or attached to it) beam-brackets can act as supports) allows you to give almost any shape (straight, rotary with a platform, in the form of a spiral, etc.) .

In order for the modular staircase to last long enough, the following rules should be followed:

under the vertical supports, it is better to pour a small concrete platform - a kind of foundation that takes on the weight of the structure;
if part of the load through the brackets will be transferred to the wall, then this wall should be solid, at least 200 mm thick (and not a thin partition);
a ladder installed on a wooden floor should be supported on logs, having previously strengthened them with transverse bars.

It is impossible to create modular stairs without preliminary calculations. To carry them out, you will need:

Make a drawing of the room in which you are going to install the stairs. Such a scheme is best drawn to scale (on paper in a box or graph paper).
Measure the height of the room, in centimeters. Next to the plan of the room on the sheet, schematically depict the section of the room in height (mark with lines the level of the floor of the lower and upper floors with the obligatory observance of scale).

Then make a schematic drawing. The distance between the steps (vertically) should be 14-16 centimeters. If the last (upper) step turns out to be less than necessary in height, “scatter” this “surplus” evenly over all other steps. For example, the floor height is 280 centimeters. With a step height of 15 centimeters, we get 18.6 steps in the diagram. In this case, it is better to make 18 steps, the distance between which in height will be 15.5 cm.
Draw a horizontal projection of the steps on the floor plan. The recommended width of the stairs is 1 meter. The width of the step is 28-30 centimeters.
When constructing a straight or L-shaped structure, the number of steps in which exceeds 15, it is better to make an intermediate platform, the length of which is 1 meter.

A spiral staircase must have an internal radius at which the free part of the step (from the side of the turning center) will maintain an open width of at least 20 centimeters.

Make a large drawing of the modules on which the steps will be attached. All modules must be the same. If you plan to order modules, then a drawing is not necessary.

Let's start creating

First, we choose the material for the steps: any wood you have will do (the thickness of the board must be at least 4 centimeters). The boards on the steps usually have to be glued together and at the same time additionally fastened with long screws (to ensure the necessary strength). Alternatively, you can buy ready-made wooden steps required size or purchase massive board suitable thickness (or glue two less thick ones).

Modules of circular cross section, on which the steps will be attached, are not so easy to make on your own. Therefore, it is better to order them in a special company, providing your drawing and calculation of the stairs.

Square modules can be made from a profile pipe with a wall thickness of at least 4-5 mm. The elements will have to be connected to each other with bolts (4 pieces for each connection), plus additional welds to enhance reliability. It is this option that we will now analyze in detail with you.

The assembly of a modular staircase always starts from the bottom, therefore, first of all, it is necessary to perform concrete pads(foundations) for bearing metal supports which can be immediately concreted into them.

Cut the profile pipe into elements of the length you need.
Drill holes in them to fasten the modules together with bolts.
Remembering to attach the modules to the bearing supports, assemble the entire structure.
To strengthen the structure, make several welds.
If you decide to make steps with a metal corner edging, weld it to the modules at this stage of the assembly of the structure.
Paint all metal parts with special paint, after removing rust.
Set steps.
Make a railing for the stairs (wood or forged).

Video

This video is about installing a modular ladder.

When building houses, cottages with two or more floors, the question often arises, what design of stairs to choose?

At the same time, it should be comfortable, beautiful, occupy a minimum of space in the room. usable space. One option is to use modules when assembling a flight of stairs. About what are modular stairs and their assembly, produced at home, will be discussed in this article.

A modular staircase is a structure consisting of identical, securely fastened modules with steps, which are attached with studs, bolts or screws to the central stringer.

Prefabricated modular stairs are designed for installation between two floors, when the height of the structure does not exceed 3.5 meters.

The main loads on the product are the own weight of the stairs and the weight of people moving along it. They are transferred to the upper and lower modules, and to the support column, which is installed if necessary. The maximum allowable load on the module can be no more than 250 kg.

When choosing a design, you need to pay attention to the type of ladder support. There are two constructive types:

With support on a bracket or console mount;
With the use of support posts, which are recommended to be mounted through 4 - 7 modules, with a span of 2.5 m or due to the impossibility of firmly attaching the finishing element to the intermediate floor.

The optimal angle of inclination of models is 39 ° - 43 °, but sometimes up to 65 ° can be allowed. The presence of special inserts allows you to adjust the height of the modules. Minimum Height the tread of the structure is 180 - 200 mm, and the maximum is 240 mm.

The advantages and disadvantages of the models are presented in the table:

Advantages

Flaws

A wide variety of styles for designing models;
Easy installation and dismantling of the stairs;
The ability to adjust the angle of rotation of the structure up to 360 °. The exception is stairs with the connection of elements on studs;
Stairs can be made from a variety of materials;
Indoors occupy a minimum of usable territory;
Relatively low cost stairs;
A fairly simple repair, which is explained by the replacement of standard parts from which the structure is assembled or its individual modules.

The likelihood of loosening and subsidence of the stairs. To prevent this, it is necessary to install additional retaining posts, but this can ruin aesthetic appearance products;
With a march width of more than one meter, when a person moves up the stairs, a large bending moment arises, which leads to rocking, vibration and possibly tilting of the entire structure.
In terms of strength characteristics, such models are inferior to all-welded products.

Product types

Prefabricated modular stairs, depending on the configuration, are:

Construction type	Peculiarities
	These are the usual straight models of stairs with wide steps. Very comfortable and reliable in use, but rather large and not quite compact.
	They occupy a minimum of space, but are not very convenient in operation, compared with mid-flight structures (read more).
	This is with intermediate platforms. Occupy less space than marching, and quite comfortable. Made from two or more marches.

There are also subspecies of structures that depend on the geometry of the descent, which can be seen in the photo:

The most common version of modular models is a single-flight staircase, and the most popular configuration is a rotary one.

Simplicity and relatively low cost explain the popularity modular system.

The structure includes:

ladder frame. In its composition:

Top or finishing module;
Middle module;
Lower or starting module.

steps;
Retaining vertical racks;
Balusters;

The construction frame is usually made from:

Of stainless steel;
Structural steel, which is then coated with a polymer or special paints and varnishes;
Wood, on request.

Tip: When making a product with your own hands, for the frame, you should choose sheet metal rolled with a thickness of at least 3 mm. The best option is the thickness of the sheets 4 - 5 mm.

For the manufacture of steps, the following materials are used:

Solid wood;
Pressed glued wood;
PVC, plastic;
Pressed plywood.

Features of the modular staircase device and its assembly options

How to assemble a modular staircase, the video shows with all the details.

But at the same time, before installing the structure, the following nuances should be taken into account:

In order for the movement on the stairs to be comfortable, it is necessary to make an opening in the floor of the second floor with dimensions of at least 0.9 x 2.5 m;
To fasten structural parts together, it is recommended to use screws or bolts with a length of at least 15 mm;
In the manufacture of a 180 ° turn staircase, at least 6 modules and the same number of winder steps should be provided;
In the manufacture of a 90 ° turn staircase, at least 4 modules and the same number of winder steps should be provided;
The support post must have a support base with dimensions of at least 60 x 120 mm;
At least 4 fasteners are used to fasten the rack. They can be bolts, anchors, studs.

To draw up a plan for assembling a modular staircase and perform its calculation, it is necessary to take into account the following factors:

Structure inclination angle. The most comfortable angle is 45°, but it can be different, depending on the width of the tread and the height of the riser, or the height and width of the step. The table below shows these dimensions depending on the angle of inclination;
The height of the stairs. To do this, measure the height from the floor of the lower floor to the floor mark of the upper floor. This is necessary to calculate the total number of steps and their sizes, and to select the most optimal angle of inclination.

For the manufacture of modular stairs ideal sizes are considered:

Step height from 170 mm to 200 mm;
Step width from 200 mm to 260 mm;
The length of the steps depends on the type of construction. For screw it is selected from 1 m to 1.2 m. For marching and turning from 1.2 m to 1.5 m;
The angle of inclination of the product is 30° - 45°.

After choosing the parameters of the model, you can use any computer design program, for example, ArchiCAD.

After entering all the data into the program, it creates a staircase model. If necessary, you can make changes to it.

Tip: To take into account all the details, the design of the stairs should be done simultaneously with the development of the design of the house. In the absence of experience in carrying out such work, it is worth contacting specialists.

The assembly of a modular staircase, depending on its type, can be done in the following ways:

"Module to module";
"On a threaded stud";
"On the clamp."

Assembling the stairs "module to module"

The assembly process of the “module to module” structure is as follows: a smaller diameter pipe in the upper module is installed in a larger diameter pipe in the lower module.

In this case, the modules can be made in one piece, cast from metal, or welded. On both sides of the elements are connecting pipes different diameters and heights. Pipe plates are bolted together.

The pros and cons of module-to-module technology are presented in the table:

Assembling the stairs "on a threaded stud"

This option includes many individual parts modules connected to each other by threaded studs.

The table shows the advantages and disadvantages of the process:

Assembling the stairs "on the clamp"

Assembly "on a clamp" is a rigid fastening of the module parts with screws or bolts. Typically, a module consists of two parts:

horizontal, consisting of two pipes interconnected by a plate by welding;
vertical - this is a pipe with a flange that serves to fasten the step. In this case, two parts are fastened to each other and to the adjacent module with tie bolts. The position and direction can be any, you can choose an arbitrary angle of rotation of the structure.

Advantages and disadvantages of assembling the model "on a clamp":

Video assembly of a modular staircase will help make the design more reliable, which will be used flawlessly for a long time.

In addition, when installing the model, it is worth remembering the following tips:

Vertical racks must be installed on pre-filled concrete bases, performing the functions of the foundation;
It is allowed to match the stairs only with the main wall, which has a thickness of at least 200 mm;
When installing the product on a wooden floor, you must first strengthen the logs with transverse bars.

Clamp assembly

Making stairs

Before assembling the model, you should complete the preparatory stage. It includes:

Creating a drawing of the room where the modular staircase will be placed. It is more convenient to do this on graph paper on a certain scale or in a special program;
Measuring the height of a room. The image of the section of the room in height with the designation of floor and ceiling marks on it;
Schematic representation of a modular ladder. The steps on it are fixed at a distance of 150 - 160 mm between them. The drawing will help to accurately determine the desired number of steps.

Tip: If the height of the upper step is too low, the "surplus" must be evenly distributed over all the steps of the stairs.

Drawing a horizontal projection of the stairs on the floor plan. The optimal width of the structure is 1 meter. It is better to choose steps with a width of approximately 300 mm;
Preparation of a drawing of modules for fixing steps. All modules must have equal dimensions and shape. Using ready-made modules, such a drawing is not required.

Instructions for assembling a modular ladder:

Materials are being prepared for the manufacture of steps. It is best to use solid wood, with a board thickness of 40 - 50 mm. Screws and glue are used to connect them. Steps can be purchased ready-made. In this case, you should focus on your preferences and design features;
Modules are being prepared for fixing the steps. It is very difficult to make round parts on your own without the necessary skills. It is better to order them immediately from a specialized company, providing it with your calculations and drawings;

Tip: Square modules can be made independently using profile pipes with a wall thickness of 5 mm or more. To connect all elements, bolts and welding should be used.

Concrete platforms are being constructed for the installation of load-bearing supports on them, which are immediately concreted;
A suitable pipe is cut into the required number of elements in accordance with previously prepared drawings;
Holes are drilled in the elements for their fastening;
The whole structure is assembled, in parallel the ladder modules are attached to the supports;
The system is enhanced by the creation of several neat welds. A metal corner is welded to the modules, when creating such a edging of steps;
Everything metal elements models are cleaned of rust, primed and painted;
Steps are mounted;
Forged or wooden fencing is installed;
The quality and reliability of all connections are controlled.

The prefabricated modular staircase is open and enough solid construction which can be used for giving and country house. Like any staircase, it serves to connect two floors together and is part of the design and obligatory element architecture. At the same time, the model should be well combined with the interior of the room, creating a single architectural ensemble in it.

The modular staircase is one of the most important structures house or apartment, designed to connect two floors to each other. It is an indispensable element of architecture and part of the design, must be combined with the interior of the room, create a single architectural ensemble with it.

Do-it-yourself modular staircase can be assembled with some knowledge in the field of construction. But at all stages it is necessary to adhere to the established rules. Incorrect installation or connection of parts can, over time, lead to creaking of the structure, its breakage or injury to people. An important role is played by high-quality building materials that will serve for a long time and will not begin to break and collapse over time under the influence of loads.

At modular stairs There are several significant advantages over other types of stairs:

assembly is possible without welding;
may have different shape. Based on the shape of the room, your preferences and imagination, you can choose the desired configuration;
ladder modules can be assembled to the height required. In this case, the slope of the modules is adjustable.

There are a number of disadvantages to watch out for:

modular design is somewhat weaker in strength compared to solid models. Butt joints over time, they can become loose, which requires periodic inspection of the structure;
high price.

Kinds

Before starting indoor installation, select desired view designs. The following types of modular stairs are used:

Stairs are assembled using separate typesetting elements. This will allow you to make a design of any shape you need: straight, helical, at the right angle. For rigidity, the kosour is attached at the top and bottom to the support modules. For additional rigidity, every linear 1-1.5 meters, a carrier pipe is mounted to the stringer, which is mounted on the floor or a support bracket with wall mounting.

Important! When installing a modular ladder, remember that the main thing is convenience and safety. Therefore, try not to make more than 2 turns of marches.

Assembly Options

There are three main options for mounting modular structures. In order to assemble a modular metal staircase, you need to carefully study all the options, since they have positive and negative points.

Module to module

The chain kosour is mounted from elements according to the “module to module” principle, after which each element is fixed with two patch plates with locking screws. Such stairs are the first of the modular line, they have some negative qualities:

have a fixed pitch;
the assembled staircase has a noticeable slight curvature that cannot be removed;
during operation, such a structure begins to sag due to spontaneous loosening of the fasteners.

positive quality this installation option is the simplicity and speed of assembly of the entire staircase.

Threaded studs

In this version, the connection of the elements of the stairs is carried out using threaded studs. Unlike a chain stringer, the ladder does not sag, but has minor drawbacks:

complexity of installation;
fixed stages (as in the “module to module” option);
annual adjustment and tightening of fasteners.

Idea! You can strengthen the fasteners by welding. Relevant only if you do not plan to disassemble and rearrange the stairs in the future.

Clamp principle

A modern way that took into account all the shortcomings of previous generations. A positive quality is the ability to adjust the height and length of the step. In this version, the stage mounting flange can be turned. The load on the fasteners is distributed evenly, so the fasteners will not loosen. Instead of split pipes, the elements of the stairs are fixed with long studs that take the load. The disadvantage may be the complexity of the assembly of this version of the stairs.

Installation of the above options is carried out using bolts. These fasteners are mounted to distribute the load along the edges of the steps, which increases their rigidity and reliability of the entire structure.

Important Notes

In order for the ladder to be used for a long time and not cause complaints, the following notes must be taken into account:

Before installing vertical supports, it is necessary to prepare concrete platforms for them. They will perform the function of a supporting foundation;
side support brackets can only be mounted in a concrete main wall, with a thickness of 20 centimeters or more;
if the ladder is mounted to wooden floor, then the lags must first be strengthened.

Making a modular staircase with your own hands

The easiest way is to buy a ready-made modular design and assemble it, like a design. However, if you are used to doing everything yourself, you will need some guidelines for assembling this type of ladder. So, let's figure it out.

Preparatory stage

Make a plan of the room where the stairs will be installed. It is recommended to make a plan on a scale using a special program or graph paper.
On the same paper, draw a side section of the room indicating the height of the ceiling. For the calculation, you need to take the start and end points flight of stairs at the level of the floors of the lower and upper floors. Having height and width, according to the formula for calculating the hypotenuse right triangle, calculate the length of the flight of stairs. In this case, it is necessary to take into account the safe angle of inclination of the stairs from 30 to 45 degrees. After that, we calculate the number of steps. Divide the length of the flight of stairs by allowable height steps.
Draw the planned model. An approximate fixation of the steps is carried out at a height of 15-16 cm from each other. If the last step will have some average height, then this distance is equally distributed among the other steps.
On the layout of the room, place the projection of the steps in a horizontal view.

Regardless of the purpose of the ladder and the materials from which it is made, it must comply with regulatory requirements, which are used during design and calculation:

the width of the stairs must be more than 90 cm;
the angle of inclination of the flight of stairs should be within 30-45 degrees, which meets the requirements of safety and ergonomics;
steps must have a depth of at least 27 cm;
the distance between the fence supports should not exceed 15 cm (if there are children - no more than 12 cm);
the side railing must be capable of withstanding a load of at least 100 kg.

Complete general drawing ladder modules, identical in appearance and size.

main stage

The following actions must be carried out in the given sequence:

It is necessary to decide what material the steps will be made of. The best option- steps made of solid wood. The average step thickness is 4-5 cm.
For the installation of steps, make modules. V living conditions making round modules is quite problematic. It is more convenient to order them from specialists based on your drawings. To make square modules at home, you will need a profile pipe with a thickness of more than 5 mm. Parts are fastened by welding and bolts.
Install the bearing supports on concrete platforms. After installation, the support must be concreted.
Based on your drawings, from a suitable pipe, cut right amount parts.
Make connecting holes in the parts cut and ready for installation.
Mount the entire structure by attaching the structure modules to the bearing supports.
If necessary, you can strengthen the structure by welding neat metal corners to the ladder modules.
Paint the stairs, removing rust and dirt from them.
Install pre-prepared steps.
Equip the staircase with a railing that you can choose from according to your liking and design.

Assembling a finished modular staircase

Assembling a finished modular staircase (spiral design)

After completing the installation, it is necessary to conduct a test for the safety of the structure and you can begin to operate it.

Modular stairs to the second floor allow you to create any line of descent. If during operation it is necessary to rearrange the ladder to another section, it is enough to change the turn and the shape of the steps at the turn. As a result, the staircase of a straight or rotary type will take the desired position.

Ladder installation is made from supporting elements and stands for fixing steps. As steps are usually wooden substrates. Among the main advantages are wide base plates for steps with stiffeners.

Modular ladder dimensions

Modular stairs in the house to the second floor are prefabricated structures, which are based on a type-setting kosour. It is created in the form of modular parts made of wood or metal. Screw structures are placed on a plot of 3 m2. The width of the steps is from 100 mm.

Attention! marching stairs width from 1200 mm to 1500 mm occupies an area of 400 cm, which is 7 m3.

An alternative to the two options is a mid-flight rotary structure with a given number of sites. They include from 3 to 8 steps.

Calculation of a modular staircase to the second floorproduced taking into account the normalized parameters:

Normalized tread depth from 200 mm to 260 mm. But options for 150 - 300 mm are acceptable.
Supports for the stairs are supplied in different lengths. They have the form of a round tube for installation under the stairs in several places.
Height between steps from 170 mm to 200 mm. Height adjustment is made with bolts or rings.
Step length. For screw structures from 1000 mm to 1200 mm. For marching and running structures from 1200 mm to 1500 mm.
Tilt angle from 30° to 45°.

Configuration and Mounting

Do-it-yourself modular stairs to the second floorcan be assembled from different frames:

Straight / rotary.
Goose step.
Screw.

Fastening structures:

Prefabricated fastening type. Connections are formed by placing one module within another. Screws and plates act as clamps. Outwardly, the product looks a little crooked, but it assembles quickly and easily.

steeple. Connections are formed by threaded studs. When choosing this design, every few years it is necessary to tighten the fasteners. The assembly of such a structure is very difficult.

Clamp. The product helps to adjust the length and height of the steps. The module is deployed in any direction. This type of attachment is particularly reliable.

Below are the optimal modular stairs to the second floor in the photo.

Module types

Pipes made of steel alloys are used to assemble the modular system. The creation of the frame is ensured by the sequential installation of individual parts and support posts in a kind of "ridge". The frame is the basis for fixing the steps, which are different breeds array. Next, balusters and handrails made of expensive or cheap materials are fixed.

There are 3 module options:

Cast or welded module. WITH different sides pipes of a given thickness and height are installed. Combining the long pipe of one module with the short pipe of the next part, it is installed in the selected position. Fixing is done by tightening the screws.
A simple implementation. The structure consists of two individual elements: welded part with 2 short pipes on the sides and a long pipe equipped with a flange (flat plate) to accommodate the step. At the intersection of the element with two side pipes, gaps are created for the tie bolts. Usually, according to this scheme, spiral staircase, since to make turns, relative to each other, these settings can be anything.

Installation with clamping modules – perfect solution for screw structures. The system includes big number separate parts that do not form welds. Connections are made by means of threaded studs. This is the most complex type of fastening, which is distinguished by aesthetic properties, since the fastening is hidden inside the stringer.

There are wood products, the symmetrical parts of which have gaps on both sides to accommodate studs.

Choice of supports

Supports for universal ladders are intermediate pipes that support the base of the structure. They are mounted every 4 - 7 modules, based on the type of construction. There are also brackets, the fixation of which is carried out in relation to bearing wall. The frame is formed by racks-supports or mounted on brackets.

Supports are not used only when one side of the steps forms an emphasis on the wall. Fastening in this case is done with a corner or anchor.

Modular system installation

Among the popular options are screw structures that can save space in the room. To perform the installation, the location of the central support, presented in the form of a vertical rod, is determined. It is necessary to stretch two threads diagonally in the opening of the second floor, to which a flight of stairs is led.

A plumb line is lowered from the intersection point, indicating the place of installation of the flange (II installation). A thrust flange is mounted, which coincides in the center with the received point. Fastening is carried out using screws through existing gaps.

The correct placement of the first "guide" tread is determined. To do this, place it on the floor. Then the step is put on the fixed flange along with the existing baluster. The central support-rod is inserted into the flange through the first step. After placing the first stage, the vertical mounting of the central rod is checked.

The first point for mounting the bottom flange with the module can be found by crossing the cords diagonally and plumb. The next step is put on a vertical rod by another person, located in the opening of the floors. After installing all the elements, the steps are wrapped with nuts in the places provided by the manufacturer. Upon completion, mounted on a rod landing and fixed to the walls of the opening. The fence, handrails and decor are attached.

Wall installation

The first module is fixed directly to the floor. Before that, you should read off the specified distance from the wall. The next module is taken and applied to the first. By analogy, the construction continues to build up. Before mounting the final module, the correct fixation of the stringer is checked. The supporting and finishing element is applied to the surface.

Measurements are taken, a hole is made with a puncher, and then one is screwed to the floor, and the second to the wall ceiling. Flanges are mounted. Gaps are created, applied to the module and the plates are tightened with screws.

A modular staircase is a structure consisting of identical parts fastened together (modules with steps) attached to a central stringer. If desired, such a ladder can be made independently.

Peculiarities

The modular staircase, as a rule, has a semicircular shape. To accommodate such a design, you need a lot of free space. However, this does not mean that the finished staircase will look too cumbersome. The design turns out to be neat and “airy”, the assembly features allow you to give the stairs almost any shape.

Read the benefits before you get started weaknesses modular stairs.

Advantages

Flaws

Modular stairs are not without drawbacks. First of all, the modular design is inferior to all-welded models in terms of its strength characteristics. All prefabricated connections will gradually become loose, so the owner will have to regularly monitor the quality of the structure and tighten the connections.

The second big disadvantage of modular stairs is the high cost of ready-made kits. However, you are provided with instructions for self assembly structures, so this shortcoming is not relevant. The main thing that source materials were of the highest quality.

Before starting the arrangement of the stairs, select suitable option modular structures. There are such types of modular stairs:

marching. Conventional straight designs with the simplest wide steps. Very easy to use and reliable, but rather bulky and non-compact;
screw . They occupy minimal space, but are not as convenient in terms of operation as mid-flight stairs;
swivel with platforms. They take up relatively little space and are quite comfortable. Have 2 or large quantity marches with intermediate turning platforms.

What you need to know about kosour?

Regardless of the chosen type of modular staircase, you will have to get acquainted with the main element of the structure in question - the chain stringer.

Kosour is the main central component of the considered variety of stairs. It is assembled from a number of typesetting elements, the installation of which can be carried out directly or at some angle, which gives the owner the opportunity to create stairs of a wide variety of shapes.

The kosour is fastened to the supporting modular elements from above and below, due to which the required rigidity and strength of the structure are achieved.

For additional rigidity, a support pipe is included in the design every 100-150 running centimeters.

If there is a solid concrete staircase near the location, or brick wall, from using additional elements modular design can be abandoned by fixing the stairs directly to the wall.

Stair assembly options

There are several methods for assembling ladder modules. Each of existing options characterized by its strengths and weaknesses, which you need to know about before starting work on the self-assembly of a modular staircase.

"Module to Module"

The kosour can be assembled according to the “module to module” method with additional fastening using plates and fixing screws. This is the first generation of such ladders with many disadvantages, including:

strictly limited step steps. This step cannot be adjusted;
some curvature assembled structure. It is impossible to get rid of this defect even by tightening the screws;
relatively low durability. Over time, the mounting plates begin to unbend on their own, which leads to sagging of the entire structure and causes additional inconvenience.

The only advantages of this option are the high speed and the utmost ease of assembly.