How to calculate the roof area. Counting of the roof area

The competent calculation of the area of \u200b\u200bthe roof of the house is a reasonable approach to buying roofing, thermal insulation and other building materials. You need to be able to do so that it does not collapse under your own weight or under the severity of precipitation. Understanding, how and where the numbers comes from the counts will help you draw up the estimate, control the workers, economically calculate your funds, and if you do not fit into them - to make amendments to the drawings.

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General recommendations

When the system of the rafter was already erected, but there is no building of the building, the roof plan works separately. Armed with an angle and tape measure, measure the building and apply a drawing on paper. We simulate all the heights of the skates to the floors (in the case of several levels) and make them in the drawing. Before you begin to count the roof area, for clarity, try making your roof in the projection.

Pay attention to the scenes and specify their size and location in the drawing. The easiest way to make the calculation of the area of \u200b\u200bthe roofs, in which there are no breaks on the skates. Important to remember:

The shape of the roof is better to decompose on the right geometric shapes - triangles, squares, trapezoids, and diamonds.
If you have a plan with a scheme in your hands, then consider the area on it, and then multiply the result on the cosine of the angle of inclination.
To the resulting value, add about 10% more, it will cover errors and different unexpected situations.
As a rule, newcomers are narrowed to calculate smoking pipes, mansard windows, hatches, ventilation holes and other structures from the roof area. This categorically impossible to do: the visible savings threatens the lack of material.
The presence of an exact plan significantly accelerates and simplifies the calculation process.
To determine the lifting of the skate, depending on the angle of the slope, the correction coefficient is used:

7 ° - 0.124;
8 ° - 0.143;
10 ° - 0.181;
13 ° - 0.238;
15 ° - 0.269;
18 ° - 0.325;
22 ° - 0.408;
30 ° - 0.574;
35 ° - 0.704;
40 ° - 0,839.

Features of the calculation for various types of roofs

Flat roof. It is also called inversion and most often used for household buildings. Counting does not represent complexity. From the initial course of geometry remember: the length is multiplied by the width.

Single roof. As a rule, it is also easy to calculate its area, as for a flat roof, consider only the protrusions from all four sides.

Double. The most popular option in the construction of medium-risk private houses. The definition of the roof area of \u200b\u200bthis type does not take much time.

If both halves are the same, then everything is simple: we consider the area of \u200b\u200bone rectangle and multiply twice.
The length of the skate is considered as follows: the length of the wall, along which it is located + the protrusion above the fronton, multiplied by 2. The width is the length of the rafted + 1 protrusion above the wall. For example, if the skate is 10 m, and the ski part is 6 m, then the total area of \u200b\u200bthe roof is: 2 (10x6) \u003d 120 m².
To calculate the height of the roof, we take ½ of its width and multiply on the coefficient of the angle of the slope. For example, the width of the house is 10 m with a roof slope of 30 °. 5x0.574 \u003d 2.87. So, the height of the skate will be 2.87 m.
You can also find out the size of the upper rafter by the formula. The half the length of the horizontal beam of the fronton divide on the cosine of the adjacent angle.
If you have a house with rectangular shapes, and before our eyes only its top view, then how to calculate the roof area of \u200b\u200bthe house? For these purposes there is a simple formula: S \u003d (2a + b) x (2a + c) x COS40, where A is the width of the sink, B - the length of the house, C is the width of the house, 40 is the angle of inclination of the roof. So, if we have a house 12 m long, 8 meters wide, the sinks of 0.5 m, and the cosine of the angle 40 is 0.77, then S \u003d (2x0.5 + 12) x (2x0,5 + 8) x0, 77 \u003d 90.1 m².

Four-sheet roofit happens a hip and tent. At both all the rods are located at an angle to the base, but if the first type is formed in the top, then the second all planes converge into one point. How to calculate the area of \u200b\u200bsuch a roof? First we divide her surface on simple figures. At the Walmova we get 2 triangles and 2 trapeats; Tent consists of 4 triangles.

Calculate the area of \u200b\u200bthe roof of the house on school formulas. For triangles: S \u003d (BXH) / 2, where b is the base length of the figure, and H is the height of the triangle. For trapezium: S \u003d ((a + b) / 2) xh, where a, b - base.

Since the tent shape is otherwise called the pyramid, then the course of geometry remember that the area of \u200b\u200bits side surface is equal to the sum of the lengths of its side faces. This will facilitate us counting the route of the skates, corners and so on.

Semi-haul, multiple roof.If there is a design of rectangles coming from each other and intersecting, then we have a multi-way form. The calculation process is similar, but may take longer. Each inner junction is Endow, do not forget about her handle.

How to find the roof area for laying roofing?

The data obtained may be twice as much more calculated before this area. Explains all the fact that the sheets for the slopes of the irregular shape are cut off the corners and customize. The more difficult your design, the greater the cropping.

Slate, professional flooring, metal tile. These coatings are available on a sheet form and put on the overtrown. There is such a concept as a useful area of \u200b\u200ba unit of material, so when calculating it is necessary to repel not from the nominal width, but from useful. The conscientious manufacturer always indicates these parameters on its product. For proper calculation, it will be useful to know the scheme of laying roofing.

The length of the metal tile sheet ranges from 50 to 650 cm, and the professional flooring is from 50 to 1200 cm. Do not take sheets of the largest length to save on joints: such transportation will block your savings, and the amount of waste will increase. So three steps, how to find out the area of \u200b\u200bthe roof flooring.

We divide the length of the structure to the width of the sheet and add 10% to the resulting digital, or even 15% on the clip. So it becomes known how many sheets need for one row.
We take the length of the skate from the skate to the eaves and divide the length of the slate sheet. We add 13% to the result - this is a nest of installation, which for metal tile and professional flooring is approximately 10 cm.
The number of rows multiply on the number of sheets for one row and get the required consumption. Do not forget to calculate the number of robes of material for skates, endands and parapet. As you can see, calculate the area of \u200b\u200bthe roof - it's not so difficult.

Cement-sand and flexible flooring.Soft rolled materials are the most popular type of coating of four-tight roofs. As a rule, on packages with this material, the manufacturer indicates its useful area and the cloud is already included. The total percentage of layering is approximately 10 and is calculated similarly to the sector.

How to calculate the insulation area for the roof of the house?It is easy, it is necessary to multiply the area of \u200b\u200bthe slopes on the thickness of the material layer. On packages with insulation, its number is always indicated inside and you can estimate yourself how much you need.

The more accurate the calculations, the less you have to overpay for materials. If the form is somewhat difficult, and you doubt how to properly determine the area of \u200b\u200bthe roof and not mistaken in your calculations, the Internet to help you: there are special construction online calculators that are intended for these purposes. You can also master a simple program that will give you all instructions on the roof, based on the specified parameters. How you decide to calculate the roof area should not affect the result. Use several ways to double-check yourself.