Calculation of the roof inclination angle - the main factors

Professionals builders know that the process of building a roof can sometimes be understood due to the fact that it is necessary to choose "the right material" and make an accurate calculation of the angle of inclination of the roof. These two questions are closely interrelated, because the choice of material for its coverage, the roof is depends on the corner of the roof.

We remind you that the roofs are single, two- and four-tight, it depends on how many skates for their roof you choose, and the inclination of the angle of the rod will be determined.

What factors affect the calculation of the roof slope

For example, the angle of inclination of a standard roof with one slide ranges from 9 to 60 degrees - it depends on the following factors:

  • The material selected for the roof;
  • Climatic and atmospheric conditions;
  • Purpose of the structure.

If the roof has two, or more rods, then the importance is not only the region in which the building is located, but also why the attic is needed. For example, if you use the attic not as a residential premises, but as a storage for old things, then the need to build it wide and high disappears. But if you wish the attic to become a full-fledged residential indoor room, then it is necessary to make a dense roof and know how to calculate the angle of inclination of the roof. In this case, the calculation of the angle of inclination of the roof depends on such factors:

  • The first is the design of the building and premises.
  • The second is the choice of roof materials.
  • The third is the climate conditions of the region.

Select the material for the roof depending on its slope

In regions with strong winds, it is desirable to build a roof with a minimal bias - the material should not be subjected to strong wind load. The same thing is also told about the sunny area, where the most hot days a year - in sunny regions just the least precipitation.

In those regions where there are a lot of precipitation (including rains, hands and snowfall), the angle of inclination of the roof should be made of a large up to 60 degrees, because only such a tilt will reduce the load from snow, melting waters and various kinds of garbage.

So let's figure it out how to calculate the angle of inclination of the roof. We need to take into account all the factors that were described above, so the calculation of the roofing is calculated in the range from 9 to 60 degrees. Interestingly, such a calculation usually leads to one optimal solution - 20 - 35 degrees.

With such a bias, any material for the roof is used - profile flooring, metal tiles, slate slices, etc.

All materials have a specific list of requirements that are presented to them during the construction of the structure.

If the roof is covered with metal tile

It is known that the metal tile has a considerable weight, compared with other materials. This is why it is important to make the right calculation of the roof of the roof with a metal tile, which should be optimally low.

It is important to take into account this requirement in the region with a large number of winds and hurricanes. Consequently, the angle of inclination should be as low as possible. Due to the large value of the angle of inclination, the roof can appear, because of which, in turn, the pressure on the burst structure will increase. And increased pressure is premature to destroy the roof.

On average, for the roofs that will be covered by this material, the average optimal value of the angle of inclination is 27 degrees. Consequently, your home will be protected from leakage of rainwater and snow.

The minimum roof inclination angle is only 14 degrees. If a soft tile is used, then the angle of inclination can be 11 degrees, but the roof must be carried out additionally.

Roof from professional flooring

Profile is the most running material for the roof - it has little weight, it is durable, attached and mounted quite easily.

The bias of the roof with a professional flooring and load.

If the roof is covered with a variety of soft material

To such material, we will take the rubberoid, ondulin, polymer (membrane) roofing.

This roofing design needs to make an angle of inclination from 6 to 15 degrees - the value varies from the number of layers of soft material.

For example, if the coating is double-layer, then the angle of inclination is taken equal to 15 degrees, but if three-layer, the value can be reduced to 3-5 degrees.

But the membrane coating can be used on any roofs, of any state, in all conditions, there is already an inclination angle can be reduced to 2-5 degrees.

Of the foregoing, we conclude - how to calculate the bias of the roof, the owner of the construction is solved. However, we take into account a certain dependence: the roof must withstand not only temporary, but also constant loads. The "temporary" belongs - rain, the wind and the weight they have to cover the roof, the constant load is the weight of roofing and material.

Embrelon for the roof of soft materials

The magnitude of the inclination of the roof determines the type of crate, step. At the roof with a low tilt, the shape of the crate must be as short as possible. For the roof with the minimum size of the shaft, 35-45 cm.

Also, everyone takes one question - how many roofing material must be purchased.

The greater the angle of inclination of the roof you do, the more the material will need to be spent.


The greater the angle of inclination of the roof you do, the more the material will need to be spent.

If you adhere to all these requirements, you can make a roof that will serve not one dozen years! All the required requirements and factors help to understand how to calculate the bias of the roof. However, we remind you that for each house the calculation is made individually.

Finally, let you give you some useful tips to help you choose the roofing material:

So, if your roof slope is small, up to 10 degrees, then the roof can be even a stone crumb, gravel (we calculate 5 mm for the roof and 15 mm for gravel).

If the angle of inclination of your roof is 10 or more degrees, then we use the basic bitumen waterproofing. Applying rolled material, do not forget about the additional protective coating, which can be the usual painting.

If you have conceived to cover the roof of the professional floor, you need to seal the butt seams. Shakes must be double.

How to calculate the angle of inclination of the roof?

As a rule, to know how to calculate the bias of the roof, you need to know which height you will take a horse (and the height of the roof with a skate depends directly from what the attic is designed). So, if you make a living attic of the attic, then we consider the following calculations by valid.

We define the width of the front-roof end, for example, let 6 m. We divide the width in half: 6: 2 \u003d 3 m, and according to the standard, the height of the roof in the skate is 1.8 meters.

tG A \u003d A: B \u003d 3: 1.8 \u003d 1.67

We take the brady's table and find an approximate value - if TG A \u003d 1.67, then the angle of inclination will be approximately 58-59 degrees. We can take the maximum value of the angle - 60 degrees. This will be our desired roofing angle.


The slope of any roof is attached to the climatic conditions and structure of the building. The abundance of atmospheric precipitations makes the roof tilt steep and vice versa. In general, it is necessary to remember that before calculating the angle of inclination of the roof, keep in mind that the slope of the roof can range from 10 to 60 °. The cooler of the roof, the more material you spend.

The sling slinger, or the height of the skate is determined by mathematical path, or measure.

It is known that the roofs with a slope of 35-45 degrees are not made, since such a range will create all the conditions for the accumulation of snow in winter, and the winds such roofs are poorly tolerated. It is impossible to make a monolithic roof, so the material is stacked with joints. The joint is a place with an increased corrosive hazard, so they pay special attention during the calculations. Also, during hurricanes, the leaves and branches can be clogged in the slit, which will sweat, and the roof will deteriorate. Create holes for the penetration of rain and snow, the roof collapses.

During the counting of an inclination of the roof, remember not only about savings (cost of rafters, material, work), but also on operational qualities. If the roof is set for all the rules, it will cost more, but at home you will be provided with warmth and dryness, which ultimately helps to save significant amounts of money on repairs. Here it just plays the role of a properly chosen angle of inclination of the roof!

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