From what indicators depends the angle of inclination of the roof?

With the device of any roof, it is necessary to correctly calculate the maximum and minimal bias of the roof, as the safety and consumption of materials for construction depends on this. The value of the slope can be calculated as a percentage, but it is best to do this in degrees, since the brady's table is very convenient for calculations.

For the roofing device, a slope is one of the most important parameters laid in calculations. It depends on the material used and climatic conditions.

The bias of the roof depends on the selected material, the form of construction, alleged wind and snow loads. The calculations themselves are recommended to trust specialists, although they can be performed independently. Calculate in percentage or degrees a bias can be needed for this, the simplest mathematical formulas and elementary knowledge of geometry will be needed.

The dependence of the liner from the type of roof and roofing material

To calculate in percentage or degrees a bias, you need to pay attention to the type of construction. All this is closely interconnected with the material used. For, that is, the holmic, multi-volumets are used metal tile, roofing iron, different types of soft roofs. But for simple roofs apply the usual tile, slate.

The angle of inclination for such structures can be 30-60 degrees, otherwise the organization of water flow will not be correct. On the roof the puddles will accumulate, and this will damage the entire structure. In addition to water drain, it is necessary to think about the use of snow masses, ice accumulations, which also create a certain load on the rafyled.

The value of the minimum angles of inclination for roofs with various types of roofing coatings. Here you can see the minimum and maximum angle of the slope, which uses one or another type of roofing.

For a soft roof, that is, the rubberoid, bituminous tiles, is allowed a bias from 8 to 18 degrees, for some types of material the angle can be more, but it cannot be done smaller, since there will be no required conditions for water drainage. Only in this case the roof will be reliable.

For complex rock roofs, sheet material is applied. But in order to calculate in percentage or degrees a bias, it is necessary to take into account many factors, including the type of material, depth and width of the wave, the installation method of the crate. Basically, this value ranges from 14 to 16 degrees. Such conditions are good for water drain, snow mass.

With too little slopes that it is easier to calculate in percentage, it is necessary to take into account the need to seal the joints of the plates or seams so that melting and rainwater do not penetrate through the coating. In this case, special drainage systems are used for water drain, often internal type.

How to measure the slope of the design?

Degree ratio table / percent roof slope. The bias of the roof can be found through the height of the skate. For this, the relationship between the height of the roof of the roof and half of the downlusion is determined, the resulting result is multiplied by 100. According to this value, the percentage of the roof angle is also recognized (see table).

The calculation of the declaration of the roof is one of the most important processes, the reliability of the structure depends on it, its resistance to the most diverse loads. The optimal angle of the pitched roof is from 11 to 45 degrees. With an increase in the angle, it is possible to reduce snow loads, but the winds from it will only be intensified, and this will require the strengthening of the rafter system, crates, controls, which ultimately lead to an increase in the weight of the roof, loads from its own weight and simply to the rise in the cost of construction.

It is important to remember that the slope depends on the type of roofing materials, their quality and quantity.A climate region has a considerable effect.

To accurately determine the angle of a flat or pitched roof, it is necessary to correctly take into account all loads on the design. These include:

the total mass of the construction was erected;
snow load for a particular region.

Formulas for calculating the downhone roof. Not only the calculated values \u200b\u200bshould be taken into account, but also wind / snow load. In areas with strong winds, it is necessary to use the minimum bias of the roof.

The optimal angle is calculated in this way: first it is required to determine the mass of one square meter of each layer of roofing cake, while the rafters, a doomle, insulation, waterproofing, and so on are taken into account. The obtained values \u200b\u200bare interconnected, after which the result is multiplied by a special coefficient of 1.1. To do this, we need to use such mathematical data as the length of the rafter, the tangent for the roof angle, half the length of the span of the house, the height of the skate.

In addition to mathematical formulas, the Bradys table will be useful, where the required values \u200b\u200bare indicated. From the formulas most often it will be necessary to use such:

calculation of the length of the rafted. This is the height of the skate, multiplied by an angle in degrees between the flight of the span and the skate;
the height of the roof of the roof, that is, the calculation of the middle line of the triangle formed by the span and the rope of the roof.

Example calculations

Consider the case when the thickness of the stacked crate is 2.5 cm, and square. m roofing weighs 15 kg. At the same time, the insulation is stacked with a layer thickness of 10 cm, whose weight is on square. m is 10 kg. At the roof covering, Ondulin is used, the weight of a sq. M which is 3 kg.

The load calculation for the slope will be designed in this way:

1.1x (15 + 10 + 3) \u003d 30.8 kg per square. M.

We also consider that usually the load is assumed for up to 50 kg per square meter. m, but this number is somewhat overestimated for ensuring some reserve. That is, the value obtained by us fully corresponds to the norm.

The optimal angle of the scope roof is calculated using a mathematical tool, this is a brady's table where such values \u200b\u200bare taken:

angle of inclination in degrees - 5, the relative value is 0.8;
angle - 10, the relative value is 0.17;
corner - 5, the value is 0.26 and so on.

The dependence of the area of \u200b\u200bthe attic from the angle of inclination of the roof: if you take too much angle of inclination of the roof, it will reduce the number of useful area of \u200b\u200battic. Too small angle of inclination will result in the difficulty of the roof itself: cleaning against precipitation, strength.

In this case, the coefficient depends on the angle of the slope in degrees, if it does not exceed 25 degrees, then the coefficient is accepted per unit. At an angle of 25 to 16 - the coefficient is accepted for 1.25 and so on.

To calculate, the brady's table can also be applied, which allows you to find out the angle that matches the number after this. The height of the skate in this case is determined in this way:

first produce calculations for the width of the span;
the resulting width is divided into two;
the value is multiplied by the value, individual for an angle of inclination.

So how to calculate the bias of the roof? Everything is very simple: with the width of the building in 8 m we obtain the value of half of the span - 4 m. Now we consider the height of the rafted to the slope of 25 degrees. The table gives us the value of the coefficient of 0.47. Now half the width multiply on the resulting number, i.e. 4x0.47 and we get that the roof rafters should be lifted by 1.88 meters.

To select the angle of the slope, it is necessary to carry out the appropriate calculations. It depends on the lot, including the choice of materials, the height of the skate. Such calculations are needed to organize the right water drain, stability of snow, wind loads. In some cases, the translation of the obtained value is required, but most often the brady is applied for calculations. In addition, the influence of the roofing pie is influenced, that is, insulation, waterproofing, rafters, coating.