How to correctly calculate the corrugated roof. How to calculate the corrugated board for the roof and fence. Examples of independent calculations

05.05.2020

Profiled sheet is a modern roofing material, which is corrugated sheets of galvanized steel with a polymer or paint coating. He is valued for affordable price, durability and practicality, therefore it is widely used in private low-rise housing construction. In addition, knowing how to calculate the corrugated roof and correctly cut it, you can significantly save on roofing works Oh. There are special programs that help you quickly determine how many sheets will be needed to cover the roof slopes, but these calculations can be done on your own without using a calculator. In this article we will tell you how to independently perform an accurate calculation of the required number of profiled sheets.

You need to start calculating the required amount of profiled sheet from the design of the roof, creating a diagram or drawing. During this process, it is necessary to accurately determine the number, shape, dimensions, slope of the roof slopes, since these parameters determine how many sheets of corrugated board are required, as well as which brand can be used. Depends on the design:

Profile thickness. On structures with a slope of less than 45 degrees, snow lingers on the slopes, creating an additional weight load on the coating and the truss frame of the structure, therefore they use corrugated board with a large thickness. The steeper it is, the thinner the corrugated board can be used to cover it. Decking made of thick steel blanks has higher strength and bearing capacity, but it costs more.
The amount of vertical and horizontal overlaps. The calculation of the material will necessarily include a coefficient that reflects the magnitude of the slope of the roof, since the scheme of laying the coating depends on it. The corrugated board is overlapped so that the joints between it are sealed. The steeper the roof slopes, the smaller the recommended overlap. For structures with a slope of 12 degrees, it is recommended to observe an overlap of 25-30 cm, which reduces the useful area of \u200b\u200bone sheet and increases material consumption.

Note! Designing and accurately calculating the required amount of corrugated sheet helps to reduce the cost of roofing materials, avoid mistakes when cutting and minimize waste. An online calculator will help simplify the calculations, in which you just need to enter the dimensions, number and slope of the structure. When determining the optimal form and type of structure, the climatic conditions of the construction region and the shape of the structure are taken into account.

Calculation using a calculator program

A modern calculator program, which is in the public domain, can calculate in a matter of seconds how much profiled sheet is required to build a structure. To do this, just enter the initial data: the number of slopes, their shape, size, and slope. Programs allow you to perform the calculation quickly and fairly accurately, in addition, they have additional functionality:

Fast and accurate calculation necessary materials for complex roofs.
Automatic construction of the roof scheme and optimal cutting of the roof.
Possibility to change some parameters and compare the results in order to reduce material consumption and costs.
The ability to accurately determine the required number of additional roofing elements from profiled sheets (ridge profile, plugs, adjoining strips, valleys, wind strips).

Please note that a calculation performed by a machine has high precision and allows you to quickly visualize the roof project. The more complex the roof structure, the greater the error of manual calculations, therefore, to calculate the required amount of materials for multi-pitched structures, it is better to use a calculator program.

Main settings

The principle of calculating the required number of sheets for roofing is based on simple mathematical formulas, the calculation of which can be easily performed without using a calculator. To do this, you need to know the exact dimensions (length and width) of the roof, taking into account the overhang, as well as their slope. Further calculations are based on the following parameters:

Slope area. It is determined using trigonometric formulas depending on its shape. If the roof surface is rectangular shape to calculate the area of the roof, you need to multiply its width by the length. If the roof is asymmetric, then the calculation is performed separately for each slope in order to avoid errors in determining the required amount of profiled sheet.
The area of the corrugated sheet. In the course of calculating the required amount of material, the useful area of \u200b\u200bthe corrugated sheet is taken into account, and not the total area. This indicator reflects minus overlaps, it depends on the brand, number, height of waves roofing and slope of the structure. The fewer waves the material has and the smaller the slope, the lower this indicator and the greater the consumption of corrugated board.

Important! When calculating the required amount of corrugated board, it is not recommended to use the usable area of the material specified by the manufacturer, since it is an average indicator that does not take into account the slope of the roof. The calculator program performs calculations more accurately, as it calculates this profiled sheet indicator in accordance with the roof structure.

Counting technology

Even without using a calculator for calculations, you can accurately determine how many sheets of corrugated board will be needed to cover the roof. To avoid error, you must accurately measure the length, width and slope. Further calculations are made according to the following scheme:

First, the area of the slope is determined. If the roof is gable, it has a rectangular shape, and this parameter can be calculated by multiplying the width by the length of this geometric figure.
Then determine the total area of the roof by adding the area of the individual parts. If the roof is symmetrical, then this is easier to do.
The useful area of the corrugated sheet is calculated taking into account the magnitude of the horizontal and vertical overlap.
Determine how much material is needed by dividing the total roof surface by the usable area of one sheet. This figure is rounded up.
They estimate how many sheets are needed for a horizontal row of roofs by dividing the width of the slope by the useful width of the profiled sheet.
Estimate how many sheets of horizontal rows are required. To do this, the length of the slope is divided by the useful length of the material.
In conclusion, the required number of additional elements is calculated, given that their standard length is 2 m, and the recommended overlap is 10-20 cm.

Experienced craftsmen say that there is a way to facilitate the calculation of corrugated board to cover the roof. To do this, you need to purchase a profiled sheet, the length of which corresponds to the length of the slope. This technology allows to reduce horizontal overlaps, as well as reduce material consumption.

Video instruction

They gained popularity among consumers due to their undeniable merits:

low price;
light weight, allowing installation with low labor costs;
ease of installation;
high performance;
durability.

I must say that modern corrugated board has long ceased to be just a sheet of profiled iron.

Today this material is several layers of various protective coatings from polymeric plastic materials, which significantly increase its durability, protect against adverse natural and atmospheric influences, improve thermal, hydro- and sound insulation, and increase decorative properties.

Dimensions of corrugated sheets for the roof

First, it must be said that the standard profiled sheet marking indicates its main purpose for use in construction and the height of the wave, on which the load capacity of the material depends:

C - wall. The number in the designation shows the height of the wave, which for a given species can be from 8 to 21 mm. It finds application as a wall facing material for non-residential buildings frame type: warehouses, sheds, garages. It can also be used to build fences and fences.
NS - universal with additional stiffening ribs. It can be used both for wall cladding and as their structural elements. The height of the corrugation for this type of profiled sheet is 20 ~ 60 mm.
H - carrier, increased rigidity, independently performing the functions of a building frame. It can also be used for the manufacture of fixed formwork for walls and ceilings when concrete work. The wave height is 57~115mm.

Wave sizes

For roofing a profiled sheet with a wave height of at least 35 mm should be used, that is, starting from grades HC35 and higher. At the same time, H grade sheets are used for the manufacture of capital roofs of a large area. For individual housing construction, HC35 ~ 44 grades are most suitable.

At the same time, a sheet with a higher corrugation height should be used where there is more snow and wind load on the roof. The methodology for their calculation can be found in Appendices D and D to SP 20.13330.2011 "Loads and Impacts". There you can also find maps of snow and wind effects in various regions of the Russian Federation.

For example, for the Moscow region, in accordance with the calculation according to this method, a roof with a slope of 40 °, located at a height of 5 to 10 m, will have a snow load of about 125, and a wind load of 15 kgf / m². In total, this gives 140 kgf / m². For the regions of the Far North, this value can reach 600~750 kgf/m².

Width

should be distinguished overall and usable width. The latter is determined by the width of the corrugation for vertical overlap of sheets. Usually this value is the width of one wave of the metal slate. Modern profiles have a special form of extreme waves for overlapping sheets, and the mounting width is indicated in their marking.

For example, in the designation HC44‑1000, the last digit - 1000 indicates the useful width of the corrugated sheet in mm. AT technical specifications one more number can be specified, for example, 1044. It shows the total width of the profiled sheet.

Sheet thickness

The thickness of the corrugated board for the roof is usually 0.36 to 1.2 mm. On the one hand, the strength and bearing capacity of the material depends on it, on the other hand, its weight, as well as the price. Therefore, when choosing a material, you should focus on optimal values. Values up to 0.45 mm are typical for economy class products. For use as roofing material the thickness of the sheet should not be lower than 0.45~0.5mm.

The angle of the slope (tilt) of the roof of corrugated board

In the power triangle of the distribution of loads on the roof roof slope angles play an important role to the base line.

A sloping low roof experiences the main impact from the weight of the snow on it, and with a slope of more than 60 °, it can no longer be taken into account for any roofs. For angles from 25 to 60°, the weight of the snow load is assumed to be 70% of the maximum. But on the other hand, a steeper roof will be subjected to significant wind loads: with an increase in slope from 15 to 60 °, they increase by more than 5 times.

For roofs made of corrugated board, which have low snow retention properties, the load from it can be ignored starting from angles of 45 °.

Shed

Features of the shed roof system is that the entire amount of loads and counteraction to them must be fully provided by the truss system. If in a gable roof the lateral loads on one row of rafters are partially offset by others, then in a flat shed roof there is no such opposition from corrugated board. Therefore, in order not to make a powerful truss system, for this type of roof, usually a small slope angle relative to the baseline is chosen, not exceeding 30 ° C.

gable

The gable type of roof includes several of its configurations:

symmetrical and asymmetrical, with different angles of inclination or displacement of the ridge away from the central axis;
multi-level, or with longitudinal lights;
half hip;
broken attic.

Projects of houses with a gable roof usually include the presence of an attic or attic space . In order to obtain an acceptable height, the angle of inclination of the slopes is sometimes increased to 60 °, while strengthening the truss system to compensate for wind loads. But as the experience of many generations of builders shows, the most optimal range of inclination angles for a simple gable roof is 35~50°.

How to calculate the amount of corrugated roofing?

How to calculate how much corrugated roofing is needed? The simplest will be shed roof calculation. For him, you should know the total length of the side of the roof:

L = W / cos(arctg(H / W)) + S1 + S2 + 4 cm, where

H is the height of the ridge from the base of the roof;
W - base width;
S1 and S2 - the length of the overhangs on one side and the other. The length of the overhangs is usually taken in the range from 20 to 50 cm.

Dividing this value by the length of the corrugated sheet and rounding it up, we get the preliminary value of the horizontal rows of roofing. Sheets of roofing material are laid with overlap depending on the angle of inclination:

20 cm - less than 15 °;
15cm - 15~30°;
10 cm - more than 30 °.

Total length of required material in a vertical row will be equal to, taking into account horizontal overlaps:

Lo = (R - 1) * 2 * P + R * Wm, where

R - the number of horizontal rows of profiled sheet;
P is the width of the overlap indicated above;
Wm - corrugated sheet width.

If the value obtained exceeds the total length of the sheets from the preliminary calculation, one more row of shortened sheets should be added, then re-calculation should be performed. It is not recommended to reduce the height of the horizontal row by significantly increasing the overlap of corrugated sheets - this will increase the total weight of the roof. It is better to shorten them in one row.

Using the same method, the number of vertical rows is calculated by dividing the length of the roof ridge by the useful mounting width of the corrugated sheet, taking into account vertical overlaps equal to the width of one wave.

For a gable symmetrical roof calculation of corrugated roofing is carried out similarly for each slope. The width of the base W is then divided in half. The calculation of the roof of a more complex configuration is performed by dividing it into fragments. Moreover, such fragments can be in the form of triangles, trapezoids, which greatly complicates the calculation. To facilitate it, there are specialized computer programs, both stationary and online, for example, on this site.

In addition to calculating the corrugated roofing, it is also necessary to calculate the number of additional elements: skates, gables, cornices, valleys, snow retainers, plugs, etc. It is determined by the roof structure and will be strictly individual in each case.

Properly designed roof- this is one of the foundations of a cozy and warm home, and, therefore, also a guarantee of a comfortable and happy family life its inhabitants.

High-quality and conscientiously made corrugated roofing can serve without special care and maintenance for more than 50 years, or, in other words, the life of a whole generation of the inhabitants of the house.

Galvanized steel corrugated board is a popular roofing material, its advantages include affordable cost and easy installation that you can do yourself. Roofing from corrugated board is widely used in industrial and private construction. When designing a roof, it is important to correctly calculate the profiled roofing.

Roof design

Decking is used to cover pitched roofs. It can be a shed roof, a gable, a four-slope or a complex roof. It is important to choose the optimal angle of inclination of the slopes so that the roof can withstand wind and snow loads. The angle of inclination of the roof slopes directly affects parameters such as:

sheet thickness and depth of corrugated board relief;
required number of sheets.

The greater the angle of inclination of the slope, the greater the surface area of the roof. At the same time, the wind load is higher due to windage, but the snow load is lower, since snow rolls down from steep slopes under its own weight. Thus, for the manufacture of roofs with a slope angle of 45 degrees or more, a profiled sheet of lesser thickness can be used.

Roofs with a slight pitch angle need to be regularly cleared of snow. It is recommended to mount steel sheets of greater thickness on them so that the coating can withstand the snow mass, and also does not deform under the weight of a person. The minimum slope of a corrugated roof, according to the requirements of SNiP, is 12 degrees. The installation of such a roof is carried out according to standard technology, but it is desirable to treat the vertical and horizontal joints of the sheets with a sealant.

Table 1. Dependence of the overlap of corrugated board on the angle of the roof slope

The grade of the profile directly affects the dimensions of the vertical and horizontal overlaps, which should be taken into account when calculating the roof decking.

Incorrect calculation of the amount of material for roofing entails additional costs for the purchase of excess material, or loss of time and money, as a result of organizing re-purchase and delivery of missing elements. You can perform calculations using a special program or manually.

Programs for calculations

Specialized roofing calculation programs are characterized by:

high speed of calculations;
the ability to calculate the slope of the roof from corrugated board, castle floors, overlap of materials and other parameters;
the ability to change the parameters of some roofing elements and compare the results;
suitability for the calculation of complex roofs.

With the help of the program, you can choose best way arrangement and fastening of sheets. If it is supposed to use corrugated board of various colors, software calculation will allow you to harmoniously arrange colored stripes or squares.

When designing complex roofs with a large number of slopes, it is recommended to resort to software calculation or the help of professional architects.

Roof elements made of corrugated board

To calculate the amount of corrugated roofing country house, shed or garage, you do not need to use the program, it is enough to use certain mathematical formulas and know some subtleties. The accuracy of the calculations will be somewhat lower, but this is not essential when installing simple roofs.

First of all, it is necessary to take into account:

the number of roof slopes (inclined surfaces that provide rainfall runoff);
the area and shape of each roof slope;
slope (the angle of inclination of the slope, i.e. the overhang of the roof relative to the horizon).

ridge (rib formed by the horizontal intersection of the slopes);
ridge plank (covers external fractures of the roof, protecting them from precipitation);
ridge cap (protects against moisture penetration under the roof);
the ridge (rib) of the roof ( outer corner at the junction of slopes, located at an angle to the horizon);
valley, or groove ( inner corner, formed by the intersection of the slopes);
valley plank (serves to drain water);
cornice and frontal overhang (edges of the roofing protruding beyond the plane of the wall);
cornice strip (protects the crate, frontal board from precipitation, removes moisture to the gutter;
end (lateral sides of the slopes);
end plate (protects the ends from gusts of wind);
junction strips (protect the joints of structures, including walls, pipes, from precipitation from precipitation).

Basic principles of self-calculation

How to calculate corrugated roofing? The slope of the roof (depending on its configuration) is a rectangle, triangle or trapezoid. To calculate its area, you need to use the appropriate geometric formulas. The total surface area of the roof is equal to the sum of the areas of the slopes. Then you should determine the length of the ridge, ribs, valleys, junctions, the length of the eaves and end overhangs.

The profiled sheet has two widths:

full (total) - 1180 mm;
working (useful) - 1100 mm.

The calculations take into account the working dimensions of the corrugated sheets for the roof.

On average, to determine how many profiled sheets are required to lay a horizontal row, the length of the roof slope is divided by the working width of the sheet. The result is rounded up. With this calculation, the overlap of the material is 80 mm (total sheet width minus the working one).

Table 2. Dependence of vertical overlap on sheet grade

In addition, the overlap depends on the angle of inclination of the slope. For roofs with a slope angle of up to 15 degrees, the C-10 profiled sheet is laid with an overlap in two corrugations, and for roofs with a large slope, installation with an overlap in one corrugation is acceptable.

When counting the number of sheets in a horizontal row, one should not forget about the designed width of the gable overhangs (roof protrusions beyond the wall plane).

Then you need to determine how many horizontal rows of material will be required. The projected length of the roof slope together with the eaves and the length of the roofing sheet are taken as a basis. It is important to choose the right size of the horizontal overlap to ensure the necessary reliability of the coating. This parameter depends on the slope angle (see Table 1).

Table 3

Additional elements

When calculating the amount of roofing materials, special attention should be paid to additional elements. Their standard length is 2 meters. It is necessary to add the lengths of the slopes on which they will be installed, and divide the resulting value by 1.9. The considered overlap is 10-20 cm.

When calculating the valleys, the sum of the lengths should be divided by 1.7 - the overlap should be 30 centimeters. The result is rounded up, since the amount of overlap should not be reduced - this reduces reliability. roof structure. It is recommended to immediately calculate the minimum required number of fasteners - self-tapping screws with special rubber gaskets that protect the attachment points from moisture. For one square meter of corrugated boarding, 7-8 self-tapping screws are required. For a two-meter additional element - 8 pieces. Knowing these values, you can perform the necessary calculations.

By correctly calculating how much corrugated roofing is needed on the roof, you can install the roofing in one step, as well as minimize the amount of waste and unused material.

One of the most popular roofing materials is corrugated board, which compares favorably with most other materials with its low cost and ease of installation. Not only private, but also industrial roofs are created from corrugated board. In order for the roof structure to effectively perform its functions and be sufficiently reliable, it must be correctly calculated. About how to correctly calculate the corrugated board for the roof, and will be discussed in this article.

Roof design

Decking is actively used for the installation of pitched roofs, regardless of the number of slopes and their configuration. An important parameter of pitched roofs is the angle of inclination of the slopes, on which the ability of the structure to withstand snow masses and wind loads depends.

The slope of the roof slopes affects two indicators:

The thickness and depth of the relief of the corrugated board;
The number of profile sheets.

An increase in the slope of the slopes leads to a proportional increase total area roofs. With a large slope, the roof experiences a large wind load due to an increase in windage, but at the same time, the structure is less susceptible to precipitation, which can independently move off the slopes. Given these factors, it is possible to determine the thickness of the profiled sheet - for example, if the slopes are more than 45 degrees, sheets of smaller thickness are required.

If the roof has a slight slope, then it will have to be cleaned regularly. Such a design would require thicker sheets capable of supporting the combined weight of the snow and the person clearing it. According to the standards minimum slope corrugated roofs can be 12 degrees. The layout of the profiled sheet on the roof in this case will be standard, but it is strongly recommended that the sheets at the junctions be treated with sealant.

The amount of overlap of sheets, depending on the angle of inclination of the slopes, is as follows:

With a slope of up to 14 degrees, the overlap should be at least 20 cm;
If the slope varies from 15 to 30 degrees, the overlap can be about 15-20 cm;
With a slope of more than 30 degrees, the overlap can be reduced to 10 cm.

If we talk about the number of sheets required for installation, then the calculation is aimed primarily at preventing unnecessary expenses. It's simple: an excess amount of material is simply not needed, and a lack of profiled sheets will require an extraordinary purchase of the missing elements. To avoid such situations, it is necessary to calculate the area of \u200b\u200bthe profiled sheet in advance.

Programs for calculating the amount of material

To calculate the profiled sheet on the roof, you can use the appropriate programs that have the following advantages:

Very fast calculations;
The ability to determine each of all the parameters of the roofing;
Ability to compare individual elements of the roof at the design stage;
Possibility of carrying out calculations for roofs of the most complex configuration.

Good program for calculating the roof from corrugated board allows you to choose the most suitable arrangement of sheets and the method of their fastening. When using sheets different color the program will allow you to arrange them with the maximum implementation of decorative properties.

The device of a roof from a professional flooring

Of course, the programs give maximum performance, but the calculation of the number of profiled sheets can be carried out without them - it is enough to know a few mathematical formulas and take into account a couple of nuances. The accuracy of such calculations will not be very high, but for a simple roof this is not so important.

The calculation of the roof is mainly influenced by the following parameters:

The number of roof slopes;
The area and shape of each roof slope;
Slope slope.

Skate;
ridge bar;
ridge cap;
Roof rib;
Endova;
Valley plank;
Eaves and front overhangs;
Cornice strips;
The ends of the slopes;
end strips;
Connections.

How to calculate how much profiled sheet is needed

As mentioned above, it is not so difficult to calculate how many sheets of corrugated board are needed on the roof. First of all, you need to evaluate the shape of the roof slopes, which can be rectangular, triangular or trapezoidal. Knowing the shape of the slope, you can calculate its area using the appropriate formula. When the area of \u200b\u200ball the slopes is calculated, it remains only to sum them up. After that, the lengths of all extreme elements of the roof are determined - the ridge, overhangs, etc.

The total width, which is 1180 mm;
Useful width, which is 1100 mm.

When calculating, you need to use the value of the useful (working) width of the profiled sheet. To determine the number of sheets required for each horizontal row, the length of the slope is divided by the useful width of the profiled sheet, and the result is rounded up.

When using the calculation method described above, the overlap value is 8 cm. This value is not relevant in all cases - the vertical overlap may vary depending on the corrugated board used and the wave pitch. So, for sheets of grades S-8 and S-10, the overlap should be 2 corrugations, while other grades can be covered with one wave.

In addition to the above parameters, the amount of overlap can also vary depending on the slope of the slopes. For example, for a roof with a 15-degree slope, the C-10 sheet should be laid with an overlap of two waves, and with a larger slope, the overlap can be reduced to one wave.

When all previous calculations are completed, it's time to calculate the number of horizontal rows of corrugated board. To do this, you need to know the length of the roof slope, taking into account the eaves overhang, and the length of one profiled sheet. It is very important to ensure that all the data obtained as a result of the calculations converge and allow you to create an integral structure.

The last point that also requires some attention is the length of the cornice overhangs. Before calculating the corrugated board on hipped roof, you need to know which profiled sheet will be used for the roof. For example, for sheets of grades S-8, S-10, S-20 and S-21, the length of the cornice overhang should be from 50 to 100 cm, and more powerful sheets allow you to extend the cornice up to 3 m.

Calculation of additional elements for a metal profile

When calculating the materials for the roof, knowing how many squares are in the profiled sheet is not enough - you need to take into account not only the dimensions of the corrugated sheet for the roof, but also the additional elements. The standard length of these parts is 2 meters. To calculate their number, you need to take the total length of all slopes and divide the resulting value by 1.9 (the value comes out exactly this way because of the overlap, which is usually about 15 cm and is taken into account in the calculations).

In the case of valleys, the length of the slopes is divided by 1.7, which is associated with an increase in overlap. The calculation results must be rounded up - in the end, all inaccuracies will further affect the quality of the roof, and reducing the overlap increases the likelihood of leaks.

It will not be superfluous to calculate the required number of fasteners. As a rule, self-tapping screws with rubber seals to protect openings from water intrusion. The number of fasteners is calculated simply - for one square meter coating requires about 7-8 self-tapping screws, and for additional elements - exactly 8 self-tapping screws for one. Knowing the area of \u200b\u200bthe roof and the number of additional parts, it will not be difficult to calculate the number of fasteners.

Conclusion

Competent calculation of the metal profile for the roof makes it possible to minimize unnecessary costs and simplify the installation of the structure due to the high-quality selection of sheet sizes.

The professional flooring is very popular in low-rise construction. It is widely used not only for roofing, but also for installation, for example, fences. The material has an affordable price, is light and easy to self-install, has an attractive appearance.

One of the important points when working with corrugated board is the exact calculation of the required volume of material. Today we will consider how, with the help of specialized calculators, you can independently calculate the corrugated roofing.

In this article

Understanding roof construction

Before performing the calculation of corrugated roofing, it is important to clarify all the parameters of the roof. The design of the rafters, the height of the ridge, the slope of the slopes and many other parameters will affect the number of sheets required for the arrangement of the roof.

Decking is a roofing material used to cover pitched roofs of various designs, both simple (single, double-pitched) and complex (four-pitched, hip, etc.) An important point is the choice of the slope of the slopes. Depending on it is the ability of the roof to withstand the load of wind and snow. A number of parameters will depend on the selected angle of inclination:

The thickness of the material and the height of its relief;
Quantity of corrugated board.

With a larger angle of inclination of the roof, its area increases. This increases the wind load, because the windage of the structure increases. However, the snow load in this case is reduced: the snow comes off the steep roof faster. Based on this, we conclude that roofs with an angle of 45 ° or more are covered under corrugated board of a smaller sheet thickness.

More gentle roofs must be cleared of accumulating snow masses. That is, it is desirable to equip such roofs with thicker sheets that will withstand the weight of the snow mass and do not deform under the weight of a person.

The amount of horizontal overlap of corrugated sheets depends on the angle of inclination of the roof:

With a slope of up to 14 °, the sheets must be joined with an overlap of 20 cm or more. At a lower value, the likelihood of leaks is high;
An angle of 15-30° is assumed to be a joint of 15-20 cm;
Roofs with a slope of more than 30° require an overlap of 10-15 cm.

The brand also affects the values of horizontal and vertical overlaps when laying a profiled sheet. Information about this can be found in the information tab of the material itself.

Thus, the parameters of the roof directly affect the number of sheets of corrugated board that you need to purchase for its improvement.

Working with online calculators

The Internet now offers many roofing calculators freely available that can calculate the amount of roofing material for any type of roof structure.

To work in this program, you must enter data about the roof: shape, main dimensions, angle of inclination of the slopes.

Working with such programs is convenient for a number of factors:

The calculator in a short time and with maximum accuracy calculates the amount of material for a roof of any, even complex shape;

Recall that complex types of roofs are not entirely suitable for covering with corrugated board, since in this case the material will give a lot of scraps unsuitable for further use.

The program will automatically present a 3D drawing of the future roof and choose best option sheet layouts;
You can change the design parameters and compare the results obtained by choosing a more cost-effective option;
The calculator calculates not only the required number of profile sheets, but also the dimensions of the required additional elements: valleys, various planks, plugs, etc.

Note that the computer calculation of the roof is always very accurate. With a complex roof structure, we recommend using this particular method, since manual calculation gives a much larger error.

Manual roof calculation

Area of slopes. With simple pitched structures, when the slopes are in the shape of a rectangle, this is not at all difficult. It is enough to multiply the length of the slope by its width;
Profiled area. For this parameter, it is important to take not the actual, but the useful area of \u200b\u200bthe sheet. The dimensions of the overlaps are subtracted from the total area of the coating, the magnitude of which depends on the grade of the coating and the slope of the roof. Consumption of corrugated board increases with a smaller angle of inclination of the slope and a smaller size of the waves of the sheet itself.

Let's give an example of how to calculate the area of \u200b\u200bcorrugated roofing. We take into account that the standard sheet width is 118 cm, while usually about 8 cm go under the overlap. The useful width of the corrugated board is 110 cm. To calculate the number of sheets, it is necessary to divide the length of the roof slope by the calculated useful width of the sheet.

Calculate the number of sheets in one row. At the same time, it should be taken into account that the length of the roof includes a cornice overhang of at least 5 cm. It is also important to take into account the dimensions of the vertical overlap, which, depending on the slope, ranges from 15 to 30 cm. Manufacturers supply profiled sheets of various lengths to the market - from 50 cm to 6 m. When buying material, it is important to choose in advance the most convenient and economical size of sheets for laying.

Additional calculations

Sheets of corrugated board are laid on the crate, the calculation of which is also important for obtaining a solid roof. The crate for corrugated board is made of wood treated with antiseptics, with a thickness of at least 20 mm. The calculation of the amount of material for the crate depends on its step, which, in turn, is associated with the slope of the slopes:

A more gentle design requires a smaller crate step - in the region of 20-30 cm;
With a steeper roof, which experiences less load from the snow, the distance between the ribs of the purlin system can be increased to 50 cm.

The calculation of the roof for corrugated board requires the calculation of the number of a number of additional elements. Here are the basic rules that will help you quickly calculate these parameters:

The elements for the valley are calculated with a coefficient of 1.7, since the valley is laid with joints of 30 cm. It is important to remember that the standard length of all additional elements is 2 m. So, in order to calculate the required amount of material, for two elements of the valley, the total length is 3 .5 m, you need 3.5 / 1.7 \u003d 2.05 elements;
The remaining additional elements are installed with an overlap of 10 cm. For their calculation, a coefficient of 1.9 is applied;
When calculating the required number of self-tapping screws for attaching sheets to the crate, it is taken into account that 1 m2 of the profile requires 7-8 elements.

It would be useful to mention the rule according to which all calculations made must be rounded up.

Summing up

So, the calculation of the number of profiled sheets is associated with a number of parameters:

The slope of the slopes;
The brand and characteristics of the roofing material itself.

It is possible to make calculations using online calculators, which is recommended for roofs of complex shapes, or on your own. In self-calculation, we recommend that you carefully consider all the little things, without losing sight of the features of the crate system, the dimensions of the material overlaps, various roof extensions, for example, the size of the pitched overhang.

When buying a profiled sheet, based on the results of the calculations, it will not be superfluous to add 10% to the figures obtained, since even the most accurate and powerful calculator is not immune from errors in the calculation due to incorrect data or from unforeseen situations during the installation itself.