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# How to calculate a ladder? Blondel's rule for determining the rise and tread of a staircase The best known ratio is that: 2 a + p = 62/65 cm. This ratio is also known as Blondel's rule and is the one that is commonly used the most.

## How do you calculate the length of a stair?

This will be the number of stair treads. Now calculate the total length of the stair by multiplying this number by the depth of a single tread. So, if you are using 25 '' treads and need 20 risers, you will multiply 25cm by 19, giving you a total length of 475cm (4,75m).

## How is an internal staircase made?

To build an internal staircase, a regular design of the step is necessary, consequently it is advisable to respect the ratio between rise (a) and tread (p): 2a + p = 63 cm. From this formula it can be deduced that the ideal rise is less than 19 cm, while the ideal tread is 30 cm.

## How to calculate an 8 step ladder?

Blondel's law establishes the following equation as the correct formula for those who use the ladder to perform the act of climbing the ladder: 2 rises + 1 tread = 64 cm. The ideal relationship is rise = 18cm and tread = 28cm.

## How to calculate a steel staircase?

Example of calculation of a 2,60 meter high staircase made according to the Bondel formula
1. 260/15 = 17,33 cm high for each upright.
2. Calculate the width of the step.
3. Apply Blondel's formula:
4. (2 x 17,33 cm) + (1 x tread) = 64.
5. Each step will measure 29,34cm.

## Find 18 related questions

### How do you calculate the slope of a staircase?

Note both values, simply divide the riser by the tread and multiply by one hundred. The value obtained is equivalent to the percentage of inclination of the scale.

### How to heal an internal staircase?

If, on the other hand, the changes are more substantial and concern, for example, structural elements or changes in the building elevations (e.g. new internal staircase, moving windows, balconies, etc.), a SCIA (Certified Notification of Commencement of Activities) must be submitted in amnesty.

### What slope must an internal staircase have?

The flight of internal stairs must be at least 80 cm wide, while in the case of a spiral staircase the diameter must be at least 110 cm. With respect to the floor, the inclination of the stair ramp must be between 30 and 60 degrees.

### How to divide a masonry staircase?

HOW TO DRAW STAIRS AND INSTALL THE STEPS CORRECTLY
1. Find the base point. ...
2. Find the finished point on the top floor. ...
3. Divide the maximum height of the staircase by the number of steps. ...
4. Check that the risers are the right size by subtracting the total height of the step from the thickness of the tread.

### How can I cover an internal staircase?

Marble. Among the most common materials for covering internal stairs, marble is an example of a classic and at the same time modern style. The main features that make this material one of the most used are undoubtedly its resistance to scratches and impacts and its durability over time.

### How do you calculate the scaling?

At a scale of 1: 200, the value that you report on the paper will be the real value of the length divided by 200, at a scale of 1:50 it will be divided by 50, at a scale of 1: 1000 it will be divided by 1000. We have obtained that a length of 8,40, 4,2 m, corresponds to a 1 cm segment on the paper, in a 200: XNUMX scale drawing.

### How many steps to make a floor?

Sixty steps, to be precise.

### What does scale 1 to 10000 mean?

The way to do it is simple: just separate the last two digits of the scale with a comma: So in scale we will know that: 1: 10000 a graphic centimeter is equivalent to 100 meters on the ground; ... 1: 100000 a graph centimeter equals 1000 meters on the ground.

### How much space does it take for a staircase?

For a staircase with side-by-side ramps, there will be a minimum overall width of 170 cm, considering the central 10 cm between the two ramps. Finally, in the case of a spiral staircase, the diameter must be at least 110 cm.

### Where to place the internal staircase?

Internal stairs, if not between two walls, must necessarily have a railing and a handrail. The horizontal or vertical elements that make up the railing must be at a maximum distance of 10 cm from each other, while the handrail must be placed 90 cm from the steps.

### How much does it cost to repair a staircase?

Its service consists in evaluating the building intervention, ascertaining compliance with the town planning and building regulations in force and drawing up a report to be attached to the request for amnesty. Usually, the cost is between 500 euros and 1.500 euros.

### How to heal window opening?

Having said that, the opening of an opening on the prospectus (and therefore modification of the same) is a building abuse of "MEDIUM" severity which in some cases can be remedied, precisely, with the presentation of a SCIA in amnesty (fine: variable from a minimum of 1.000 euros if the property does not fall within the fabrics of the historic city, ...

### How to heal pre-1967 building abuse?

It will be enough to present the Cila in which it is certified that the work was carried out before 1967, even in an inhabited center, and to register the building under this title. From that moment the building has been sanitized and marketable.

### How is the slope of an inclined plane calculated?

An inclined plane (for example an uphill or downhill road) can be characterized by its percentage slope, defined as the ratio between the two legs of the triangle ABC, multiplied by 100: percentage slope = AC / BC · 100.

### How to calculate scale 1 to 50?

For the scale of 1:50 we have: 10 meters (measured in reality), divided by the number 50, correspond on the sheet to 0,2 meters (ie 20 centimeters). For the scale of 1:20 we have: 10 meters (measured in reality), divided by the number 20, correspond on the sheet to 0,5 meters (i.e. 50 centimeters).

### How high must a step be?

The legislation states that the tread can vary between 23 and 30 cm, while the rise ranges from 16 to 20 cm. The first step of the ramp, called an invitation, can be slightly higher than the others, while the last step is called the "landing step". Normally each flight should have about 10-12 consecutive steps.

### How much does a steel ladder weigh?

Open staircases are those with the most variable weight, this depends on the type of structure, development and of course on the materials, in a completely indicative way, consider that a staircase with 15 metal and wooden steps has a weight ranging from 350 kg to 400 kg. kg, a steel and glass ladder from 500 kg to 600 kg.