Fire escape calculation online calculator. Programs for designing and calculating stairs. Calculation of a straight staircase on bowstrings

The stairs in the house are not easy decorative design. It serves for convenient and safe ascent to the second floor, attic or upper tier premises. Here we will try to answer the questions how to calculate stairs. It is with this procedure that its production begins.

Type of stairs: features of choice

The choice of staircase type depends entirely on design features buildings - ceiling heights, room sizes, etc. Taking into account all the circumstances, choose a spiral, one-, two- or three-flight staircase. Examples of such designs can be seen in the following photos.

We will not consider the question of how to calculate a spiral staircase, since this type of construction is too complex for an inexperienced craftsman.

The vast majority of homeowners choose marching stairs, which are much more practical and easier to manufacture than their screw “brothers”. Easiest calculate a wooden staircase to the second floor, if she has one march. However, such a solution is not always possible (for example, due to lack of space), so in such cases they usually use rotating two- or three-flight structures that can fit into a limited space.

Rotations of flights by 90 or 180 degrees provide landings. In every specific case answers to the question, how to calculate stairs, will be different, but the calculation method is common to all marching structures. They may differ in the set and types of structural elements, so for someone who decides to independently make a staircase in the house, its drawings and calculations are the primary and most important task.

Basic parameters of the staircase that provide comfort for the user

First on the list of answers to the question, how to calculate stairs, will be a reminder of the existence of basic parameters that ensure comfortable and safe use of it

Among them:

• ​ angle of inclination, or slope;
• width or pitch of steps;
• width of marches;
• height of risers;
• dimensions of the opening for the stairs.

These parameters have numerical values. The optimal ranges of their values ​​are determined taking into account the anthropometric data of a person. They are not obligatory for a private developer, but without them you will not succeed. It's better to add another step than to constantly trip on a high riser.

Staircase details and calculation of their parameters

Stairs in the house are high-risk areas, so their construction should be treated with the utmost responsibility. Let's start by illustrating what parts may be included. staircase design:

This drawing will illustrate, how to calculate stairs and not miss important technical parameters. For its production, only high-grade coniferous and hardwood– pine, oak, larch and others.

Calculations of structural elements are mandatory stage drawing up working drawings or sketches, according to which all the parts are subsequently manufactured and assembled into a single whole. " Short course» rules for how to calculate stairs, you can view and listen to this video:

The main parameters of the stairs are the following numerical expression:

• the optimal slope of the stairs, or ascent angle, is 35–40°;
• the distance from the edge of the opening to the step below it should be at least 2 m, unless taller people live in the house;
• width of steps – 25–30 cm;
• riser height – 15–20 cm;
• march width – 100–140 cm;
• the distance between the balusters is 10–20 cm.

In order to correctly calculate the stairs to the second floor, we suggest that you adhere to the following recommendations. Firstly, the figures given are not absolute dogma and allow for slight deviations. Secondly, the dimensions you calculated should be checked for compliance with the proportions. Otherwise it will suffer appearance stairs.

To check the width and proportionality of steps, two types of dependence are used: 2a + b = 64 cm and a + b = 47 cm, where a is the height and b is the width of the step. The step of the stairs is checked by the first formula, but the digital value of the equality must fall in the range of 60–65 cm. This corresponds to the average length of a typical adult step.

Next drawing

contains basic information about how to calculate stairs and what measurements you need to take. First you need to measure the vertical distance between the floor surfaces of the first and second floors. Then, using the optimal range of slope values, determine where to attach the lower ends of the support beams. The length of the stairs is calculated using the Pythagorean theorem.

If a single-flight design takes up too much space, choose the option with two flights and a 180° turn. Thus, the staircase will take almost twice as long less space, but will cause you more trouble. At the same time, the total length of the structure remains unchanged. The number of steps is determined by dividing the total height of the staircase by the height of the risers in the recommended range. The resulting result is rounded to a whole number.

Support beams can be made in the form of a bowstring or stringer. On multi-flight stairs you can use combinations of them. For staircases on bowstrings, the steps are placed between the support beams in grooves, on corners or support bars. On stringers they are attached on top of the beam. If you are sure that you could calculate the stairs correctly, then it’s time to move on to manufacturing its parts and subsequent installation.

Manufacturing of staircase parts

The initial procedure of this stage will be the drawing up of a design drawing with reference to the location of its installation, which will allow for complete detailing of the project. Your knowledge about how to calculate stairs, should be implemented in the manufacture of its parts, and this will require actions such as:

• purchase of lumber. The use of wood with defects is unacceptable;
• preparing tools such as saws, chisels, chisels, planes, jointers, etc. (although it will be difficult without a combined woodworking machine);
• purchasing self-tapping screws, wood glue, corners and other fastening materials.

The best choice for stairs is hardwood: oak, larch, beech, ash. The production of parts requires perfect sizing and careful finishing. For example, steps are made for a specific method of fastening them.

In this case, the choice of support beams in favor of a bowstring or stringer is decisive.

When the entire set of parts is ready, a rough (test) assembly of the staircase is carried out.

This procedure is almost always performed even by professionals, and for those who are concerned with questions for the first time, how to calculate stairs and install it, this stage is required. Rough assembly is guaranteed to identify all errors, the elimination of which during final installation is extremely difficult, and often impossible.

Assembly order wooden stairs

We have already seen that the question how to calculate the stairs correctly, is very multifaceted and involves a large number of recommendations for every aspect of this process. If everything is done according to the rules, then assembling the stairs on site should not give you any problems. The type of support beams also affects the order of assembly. Installation of stairs on stringers begins with their installation. A short overview of this process is presented in this video

Flights of stairs on strings are assembled on the floor and then installed in finished form in place. This is due to the peculiarities of fastening steps and risers, which are clearly visible in the following video

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This operation cannot be performed on pre-installed support beams. A common disadvantage of such video tutorials is the long duration of the videos. In this regard, manuals on the topic, how to calculate stairs, are clearly winning.

After assembling and installing the marching structures and platforms, they proceed to installing balusters and railings that form the staircase fencing, which ensures the safety of users. All connections of parts are made with the simultaneous use of hardware and glue. This ensures the durability of the connections and protects the wood from premature wear. If possible, it is recommended to use wooden dowels as much as possible instead of self-tapping screws.

At this point we will put an ellipsis in the answers to the question of how calculate a wooden staircase, manufacture and install it. The topic is too voluminous to cover all the nuances in one article. Fortunately, nowadays there is the Internet, where you can find answers to any questions, including highly specialized ones. And if you manage to build a wooden staircase at home with your own hands, share your experience with others.

Calculation of staircase steps allows for the design of the structure using standard standards and requirements provided for the convenience and safety of the structure. Based on the amount of space allocated, the choice of materials and ceiling height, using simple calculations, you can quickly determine the product configuration.

Load bearing capacity

Calculation of the steps of the stairs to the second floor is carried out taking into account a deflection of no more than 1/400 of the span. The load on the flight and the platform is collected by summing the dead weight of the structure and the temporary load: in residential premises - 300 kg/m².

Product height

In order to determine the convenience of the product, a formula for calculating the steps of the stairs is used. It is represented by the sum of twice the height of the risers added to the tread. This figure is equal to the average human step - 60–64 cm. Determination of the tread and rise is ensured by substituting the data:

2a+b= 60…64 cm.

As an alternative, another calculation example can be considered:

a+b= 45 ± 2 cm,

where a is the riser size, b is the tread parameter.

If you create a staircase with your own hands, the calculation of the steps begins with the width of the tread. It promotes full foot placement. Optimal size 20 – 32 cm. The height of the risers is 15 cm, and the tread is 30 cm wide.

Winder steps are designed taking into account that on the narrow side the step has parameters of 10 cm, and the overlap on the lower step is 5 cm. An overlap can be created if it is necessary to increase the width of the tread. Then this indicator should vary between 3 – 5 cm for steps made of reinforced concrete.

Climbing angle

The calculation of the steps of a wooden staircase is carried out taking into account the inclination within the range of 23 to 37°. If the slope is less than 23 degrees, a ramp (flat, inclined platform) is installed instead of a staircase structure. If the angle is more than 45°, an attached or folding type of product is installed. Spiral staircases have an ascent angle of 25-35°.

Number of steps

This parameter is determined by the height of the floor and the angle of inclination of the staircase structure. Having decided on the location of the structure in plan and the height of the building, the number of steps is determined graphically. Following this, the width of the tread is determined using safety formulas. The drawing is created using a scale.

If you use a stair step calculator, the floor height is measured taking into account the placement of finishing coatings on the upper and lower floors. Standard size is 2800 or 3000 mm. Indicators of 2700 or 3300 mm are less commonly used. The design of the building height is at least 2.4 m. If the height is not within the norm and is not a multiple of 3, then the steps are calculated with an accuracy of 1 mm.

Calculating the steps of a staircase using a program or manually involves the formation of an error. It can be distributed on the lower frieze step, and the remaining steps of the flight are created at the same height. steps with different heights contribute to the creation of a traumatic design. To equalize the height of the steps, you can lower the finishing coating top floor a little lower.

When calculating a staircase with steps at 90 degrees, it is not recommended to build a threshold. It is preferable to create a floor platform in the form of a ramp, at an angle. If there is a fence made of walls with doors, the floors of these installations are made with a threshold. To create a shorter staircase, shorten the width of the tread. For example, a riser height of 20 cm and a tread width of 25 cm contribute to an uncomfortable descent.

Graphic measurements of steps

Calculation of the height of the steps of the staircase is carried out taking into account the fact that free movement on the horizontal surface is provided in increments of 62 cm. The leg is raised by 31 cm. A given number of parts are laid out on the horizontal plane of the diagram. Each of them is equal to one step (62 cm).

Attention! The convenience of the structure is determined by the formula, where 2 step heights + step depth = 63±3 cm.

180 degree staircase

Calculating a staircase with steps at 180 degrees requires close attention to the gap between two flights, which are located parallel to each other. This parameter should correspond to ¼ of the opening width. Calculation in progress structures graphically:

• A schematic image is created by drawing a circle with a radius: the width of the march + 0.5 of the segment between the marches. The radius meets the minimum parameters of 1.13 parts of the width.
• Straight marches with specified parameters of width and length are drawn on both sides of the circle. A line of movement passes through the center of the marches, steps are marked (350 -370 mm wide). The resulting number of steps must be determined by an integer value.

• A vertical segment passes through the highest point of circle B and the central point A until it intersects with the lower edge of mark C. Segment BC passes through the middle of the central step of the turn. The central step is marked similarly to the first. The remaining steps are counted on both sides.
• A horizontal segment DE is drawn, indicating the last straight step. A straight line is laid through mark A and the lateral position of step 1 until it intersects with the contour DE (the marking is done with a dotted line). A second line is created through mark A and the boundary of step 2 until it intersects with the contour DE. The formed line acts as a template for all subsequent steps.
• Equal 1-2 sections are laid along the DE line. The number of lines is commensurate with the number of winder steps.
• From marks 3, 4, 5, etc. formed on the segment DE. draw segments intersecting mark 3 on DE and mark A. These contours act as the border of the winder steps.

Winder steps 90 degrees

To calculate the rotation of steps by 90 degrees. 2 oblique steps are replaced and a rotary step with edges at right angles is mounted between them. The rotary step is fixed directly to the stringers. Supporting the step using a baluster or a special post.

Rotation definition:

• Measured standard width steps. The length of the oblique step is measured from the fixation area on the stringer to the connection point on wall surface or stringer on the other side. In the drawing, a line is drawn from an angle of 90 degrees. It is provided for the creation of a turn to the central part of the placement of the narrow side of the step (to the center of the support for the handrails). In the figure, a circle is drawn with a radius corresponding to the segment from the central part of the support, on which the step is secured to its middle. From the last straight step, the required width is deposited along this radius. This is the width of the central section of the oblique step. The number 1 is placed at the end of the segment. A straight line is drawn from it to the central part of the circle.

• A straight line is drawn arbitrarily through the center so that from the segment from the number 1 it contributes to the creation acute angle. Intervals equal to “X1” are marked on the straight line, where X is a doubling coefficient. The number "1" acts as the length of the first line. You can find out the position of the second step using a straight line segment 2 times larger than the first. The third stage will have a parameter 4 times larger.
• Creating a drawing with winder steps, their width at the center is 1. Changing the angle keeps the width constant, but the placement of the step changes.

Alternative calculation method

The width at the central position of the step is determined. The turn is divided into 30 degrees. For a 90 degree turn. it is necessary to create 3 stages. Corner winder step created with installation additional timber with a cross section of 10*10 cm. The purpose of the bar is to compensate large quantity errors in determining strength indicators. On at this stage The central post is replaced by a stand for handrails and 2 stringers.

It’s every person’s dream to have their own apartment, and also better house. A building with several floors indicates that the owner has a decent income or is a jack of all trades. But this is not about the fact that any two- or three-story house needs a staircase. It’s good if, during installation, its specialists took into account all the nuances: slope, height and width of the steps. Then the staircase will be equally convenient for climbing for both old people and children, and most importantly, it will also be safe. Let's find out how to calculate the steps for such a staircase.

Height and width of stair steps

Steps of different heights and widths are a direct threat to humans. After all, going down them into dark time day, you can stumble, twist your leg or miss a step and fall. Therefore, before designing a staircase in a room, make a drawing and calculate how many steps are needed, what their height and width will be (the plane for the foot).

Stair slope

Ideally, the staircase has a slope of 24-38º. If the angle of inclination is more than 45º, then according to this steep stairs you need to go down backwards. However, it saves space in the room; a flat one will require more space.

Calculation of the number of steps

To calculate the number of steps we need two values: h and l, where h is the height of the stairs, l is the length. These values ​​are very easy to measure: h is the distance from the floor of the first floor to the floor of the second, l is the projection of the stairs onto the floor of the first floor, in other words, the distance that the product will occupy on the first floor. Let's assume that h = 2.4 m and l = 3.6 m, and we need to calculate the steps for a staircase with such parameters.

Knowing these measurements, you can select the number and size of steps. It is comfortable if one step has a riser height of 16.5-23.5 centimeters, and a tread width (a) of 22.5-26 centimeters. Based on this, we calculate the number of steps (n). To do this, you need to divide the total height (h) by the height of the riser (h1), for us a comfortable h1 = 20 centimeters, we get:

n = h / h1 = 240 / 20 = 12 steps.

Therefore, the width (a) of the step tread will be equal to the projection of the flight of stairs onto the floor (l), divided by the number of steps (n):

a = l / n = 360 / 12 = 30 centimeters, slightly more than the above norm, which is not so important.

Materials for making stairs

To purchase materials, we also need a size, namely the length of the ladder itself (c). Geometry will help us find this value: based on the theorems about right triangles, the square of the hypotenuse (c) is equal to the sum of the squares of the legs (a, b):

c² = a² + b² = h² + l² = 2.4² + 3.6² = 5.76 + 12.96 = 18.72 m²;

Stair slope angle

Also according to the rules right triangle We can easily calculate the slope angle of the stairs:

sin α = h / s = 2.4 / 4.33 ≈ 0.55;

α ≈ 34°, this is a good, comfortable slope.

Before you begin making the stairs, carefully recalculate, preferably several times, the results obtained. Take measurements carefully so that there are no mistakes and the flight of stairs turns out exactly as you drew. Thanks to a clear, reduced diagram of the product on graph paper, you can find errors in the calculations. With the help of this drawing it will be much easier for you to calculate the number of steps and other parameters.

No matter how the imagination constructs the appearance of the staircase, calculating its design according to the required type and load is a task of a completely different class of complexity. All kinds of calculators and programs for designing stairs are very helpful in this matter, and we will talk about them today.

PRO100 - simple visualization

Almost any staircase, no matter how complex it may be, can be represented as a collection of simpler steps, strings, railings and risers - boards, in other words. Therefore, drawing up a staircase project will be easiest for those craftsmen who have experience working in furniture creation programs. The well-known PRO100 is well suited for these purposes: sketch out the design simplest staircase You can use it in 30-40 minutes; even a beginner will not have much difficulty getting used to this program.

Of course, furniture programs work mainly with primitives - parts in the shape of a parallelepiped. It can be very difficult to display carved handrails and racks, specially shaped steps and other artistic delights. But if the goal is to determine Common parameters, such as height, number and layout of steps, then furniture and general purpose 3D modeling programs will be more than enough.

Of course, not if you undertake to independently draw up a project, the implementation of which will be carried out by another master. Here it is necessary to pay attention to detail and, in the end, the customer receives exactly what he was able to depict, but no more.

The main disadvantage of the PRO100 (as, indeed, of most furniture “designers”) is the lack of any automation for working with stairs. There is no way, for example, to indicate the span dimensions, pitch and height of the steps, so all the work is done from scratch. However, for most amateur projects, standard means of manipulating objects are quite sufficient: grouping, copying, moving, and the like.

It should be agreed that the goal of designing a staircase can be either only general idea about the design and main parameters, or a comprehensive visualization with all the curls and carvings, the shape of the turning and the details of fastening all the elements into one beautiful solid product. In the latter case you must have practical experience work with stairs, otherwise the project may not be feasible in principle.

Online services for obtaining drawings

You should start getting acquainted with programs for designing stairs with all kinds of online services and calculators. Their capabilities are severely limited by the web platform: although there are ways to carry out detailed calculations and qualitatively visualize a product “without leaving the Internet,” the development of such software costs too much and is almost never justified.

And yet, such programs have one advantage: they provide the user with the opportunity not to install additional software, but to carry out preliminary calculations on the run. One of the popular sites lesenka.com offers a schematic display of the staircase - the plan and section of the steps - according to the set of parameters you entered. It is possible to generate, in just a couple of minutes, diagrams of stairs, both simple single-span and spiral, and with landings and winder steps.

Another popular site is lascalagrande.ru. Free input of parameters is not available here, but the parameterization form is quite “smart” and will itself offer valid options for the user to choose from. It is possible to choose one of six types of stairs (including multi-flight, rotary and with complex shape steps), as well as calculate fences and balustrades, resulting in a drawing with the main dimensions and an isometric sketch. The website stairshop.ru is almost a complete analogue of the previous one, but it has a rare opportunity to have a three-dimensional overview of the designed staircase, albeit with a very primitive display quality.

Sites of this kind have a number of nice features. Most of them belong to companies professionally engaged in the manufacture and installation of stairs. Therefore, it is possible to familiarize yourself with the photo gallery finished products and roughly estimate the cost of the project.

Features of working at Staircon

Online design tools greatly limit your freedom when designing unique staircase designs. If you need more individual approach, you will have to use either CAD programs (Autodesk, SketchUp), or pay attention to specialized software.

The Staircon program is a very, very good option, even for one-time use. Despite the abundance of functions, this product is quite easy to master, even when using the non-Russian version. Almost each of the settings windows has a small preview, which clearly displays the nature of the changes being made, plus all customizable parameters are immediately applied to main stage. All work is carried out by parameterizing either the staircase as a whole, or individual platforms and spans, or even each step separately.

The program has three main types: overall plan, sketch and three-dimensional model. Moving sequentially from one to another, the user first configures the parameters of the ladder pocket, then general configuration stairs, for which there are several dozen built-in templates. And finally, the work ends with elaboration small parts such as fencing or handrails, and the choice of materials (including metal and glass).

As a result, the user receives design documentation, a list of parts and materials, or a rendering of a visual scene with quite acceptable quality.

Calculation of physical and mechanical parameters

Many people are interested in the question: how to use programs to calculate stairs based on load. Upon closer acquaintance with Staircon and by similar means It turns out that the calculation of technical parameters for the load is already built into the bowels of the program, and it simply will not offer to use cross-sections of materials and design of components that do not correspond to at least the average level of throughput load.

As with everything, individual calculations may be required here, especially when attaching steps to the wall on only one side, when working with suspended stairs, or when calculating concrete spans with a large dead weight.

Unfortunately, these calculations will have to be done manually: no matter how perfect the program is, you should not rely on standard algorithms. No design tool can take into account the load-bearing capacity of the walls, as well as the strength of individual materials for the execution of the staircase itself.

Is it worth learning CAD and 3D modeling?

If you do not have experience developing in Autocad or 3ds Max, you should not pay attention to this class of programs just for designing stairs. The only exception is when you need to actually create high quality visualization or fit the staircase into the overall interior visualization plan, which is quite rare in amateur practice.

But if you are already familiar with programs for 3D modeling and drawing production, getting acquainted with special software for stairs may turn out to be a waste of time. As we have already said, CAD programs cannot space steps at the same distance or automatically adjust the line of barriers to changes in the configuration of the span.

However, in reality such capabilities are only needed when developing major projects. In other cases, you can use standard linking and grouping tools, or find an appropriate plugin for working with stairs.

New construction, as well as repairs, are perhaps the biggest headache for our compatriots. Building a house or renovating an apartment requires very serious material and physical costs. Also, often a person who is faced with repairs tries to do everything he can with his own hands.

In most cases, it turns out that almost everything construction works Even a non-specialist in one field or another can do it. This also applies to such a task as, which is especially important for private housing construction. Before you run to the construction hypermarket or market, spend a little time doing math. First you will need to calculate structural elements stairs, and only then go for materials for the structure. , width and length of the structure - all this needs to be carefully considered.

In this article we will tell you how to make the right one, in accordance with design standards, safety and, of course, common sense. Thanks to this article, you will be able to make calculations and build a staircase in a private house from any materials with your own hands.

Thanks to our resource, you have already been able to familiarize yourself with the types of staircase designs and the main building materials used for their manufacture. In a residential building, the most common are staircases made of wood, less often - metal or reinforced concrete structures. Before you begin the element-by-element design of a staircase with your own hands, you need to estimate the length of the flight of stairs, select the material and calculate the load-bearing capacity of the staircase frame.

For determining bearing capacity It is customary to divide the entire structure into separate beams - necessarily statically determinable. Depending on the type of pinching of the flight of stairs - rigid on both sides, hinged, and maybe even cantilevered - a formula is selected to determine the main force factors. What is especially important to consider when calculating a structure with your own hands? Walking and running up stairs is a unique type of dynamic impact, even if it is minor. That's why bearing structures stairs must have sufficient rigidity to ensure a deflection of no more than 1/400 of the span. Total load (permanent + temporary) on flights of stairs and the site of a residential building should be no more than 300 kg/m2.

Let's get acquainted with the standards for calculating steps

It has been scientifically proven that the energy consumption for covering a horizontal distance is less than the energy consumption for climbing an inclined surface. Thanks to this, a staircase formula has been practically established that will be as comfortable and safe as possible for use: the size of the tread and the double height of the riser in total should give the average step of an adult. The projection of a human step is considered to be on average 600 – 640 mm. Then, designating the height of the riser with the letter a, the width of the tread with the letter b, the formula will look like: 2a + b = 600-640 (mm). Alternative method calculating the size of steps

These parameters can be calculated even more in a simple way: a + b = 450 (mm). This value can be adjusted by 20 mm on the larger or smaller side. Following these recommendations, we can conclude that the step must provide a comfortable step when the foot rests on the tread with its entire plane. Therefore, the width for the tread is set in the range of 200-320 mm. Most often, the tread is taken to be 300 mm, and the riser height is set to 150 mm. Data geometric dimensions guarantee that you will be able to move comfortably on the stairs without danger to your health.

Idea! By making the tread hinged, you can increase its width. Note that the length of overhang over the step below is taken within 50 mm for reinforced concrete or 30 mm for wooden stairs.

Determining the safe and comfortable slope of the stairs

Speaking about the comfort conditions of movement around metal stairs or according to a design made of another material, it should be noted that both the size of the steps and the angle of inclination of its canvas to the horizontal surface are important. It is believed that the greatest operational reliability and convenience are characterized by designs that have an inclination angle of 23-37 degrees.

Stairs with a greater slope occupy more space indoors, cool ones, on the contrary, allow you to save space. But, from the point of view of rationality, neither one nor the other is of practical value. When the angle of inclination is less than 23 degrees, you can get by with a regular ramp. On the contrary, if the angle of inclination exceeds 45 degrees, then it is more logical to use stepladders. When the angle of inclination is more than 40-45 degrees, you need to go down the stairs backwards, otherwise it will simply be unsafe.

The angle of inclination together with the height of the floor determines the number of steps in one flight. If you have decided where the stairs will be located in the plan and measured the height of the floor, you can calculate the number of steps with your own hands graphically. Then, using formulas, the size of the tread is checked for safety.

Advice! To construct an accurate section of the stairs, it is best to use graph paper: on convenient checkered paper, it will be easiest to correctly calculate the stairs in a private house with your own hands.

If we conduct another small educational program, we should talk a little about the interdependence of the geometry of the stairs and the height of the floors. Height is the difference between the level (mark) of the finished floor ground floor and top. Thus, when you calculate the height of the floor yourself, do not forget to include the thickness of the finishing (screed, ceramic tiles, parquet or linoleum, etc.). In the design of private housing, the most common floor height is considered to be 2.8 or 3.0 m, as well as 2.7 or 3.3 m (most importantly: more than 2.4 m and a multiple of 300 mm). With the specified heights, you can easily place the stairs in your living space, and the accepted dimensions of the steps will meet safety standards.

Lifehack for adjusting and calculating the dimensions of the stairs

So, as we have already noted, every step on the stairs, which have steps of different heights, is fraught with the danger of injury, especially at night. Therefore, to calculate how to level the height of the steps with your own hands in housing with non-standard heights floors, it is recommended to lower the level of the finished floor landing, located above, in relation to the floor of the entire floor. This difference should not be made straight (in the form of a threshold), but rather a small ramp should be organized. The angle of inclination of the ramp will be slight, so it will not cause discomfort when walking. There is another simple way to determine the size of steps - graphically. You can determine the width and height of each step using a simple graph. If you consider that it is convenient for a person to take a step equal to 620 mm on a plane, you will also understand that he is only capable of raising his leg to half the indicated height - 310 mm. By marking the horizontal axis with a step of 620 mm, and on the vertical axis with a step of 310 mm, and indicating the angle of inclination of the stairs, you will receive intersection points that will correspond optimal parameters. Whatever the material of the stairs (metal or wood, glass or concrete), this technique valid and applicable only for marching structures. You can also use one of the many staircase calculation services