How to calculate corrugated roofing. How to calculate the corrugated sheet for the roof - how many sheets and additional elements are needed Calculation of the number of corrugated sheets for the roof

Corrugated sheets or corrugated sheets are a popular product in the construction industry. This material is widely used in the construction of structures for various purposes. Many users have already appreciated the versatility of metal profiled sheets, making fencing, partitions, and curtain walls from them. ceiling systems and so on. However, most often roofs on private houses are covered with such flooring. This is due to the excellent performance characteristics of the coating. After all, corrugated sheeting has high strength, longevity, reliability, resistance to external aggressive conditions, as well as the necessary aesthetics. Deciding to execute finishing roofing using profiled sheets yourself, first of all, you should know how to calculate the corrugated sheeting for the roof. After all, budget saving issues depend on a correctly made calculation, since by purchasing only the required amount of material and optimally placing it on the slopes, you can avoid a large amount of waste and unnecessary joining of sheets. It is also important to calculate fasteners and other components. It’s worth talking about how to do this in more detail. First you need to decide on.

Technical characteristics of the profiled sheet

Corrugated sheeting is a material made from rolled steel various thicknesses. Raw materials pass through the lines of automated machines with special rollers, which give finished product characteristic profile. You should be aware that the height of the corrugation can vary significantly. Typically, the higher the profile, the stronger material, also to strengthen the sheets, manufacturers can apply additional grooves on each wave, acting as stiffeners. For roofing systems It is advisable to use corrugated sheeting with high performance characteristics. Most often, such a product is marked as a load-bearing material, that is, it has the code “H”. You can also find out from the markings:

  • corrugation height;
  • metal profile thickness;
  • installation width;
  • product length.

    • And some other important quantities, for example, type of coating and so on. However, to calculate the corrugated sheeting for the roof, these characteristics will be sufficient. Let's consider the standard values ​​of 3 main parameters.
    1. Wave height and pitch. This setting depends on . In particular, it is customary to distinguish the following varieties:

    • C – wall profiled sheet (used for finishing walls and other facing works, profile height 8-44 mm);
    • N - load-bearing corrugated sheeting (used for covering roofs, installing fences, during the construction load-bearing structures, corrugation height is more than 44 mm);
    • NS – universal material(can be used as a product for cladding work, for installing partitions, covering roofs and so on, profile height 35-44 mm).

    That is, you can purchase corrugated sheeting with a profile height from 8 to 114 mm, and the higher this parameter, the more durable the material is. As for the wave pitch, the value can also vary within 4-20 cm. When calculating the profiled sheet, it is worth taking this parameter into account in order to know how much overlap can be made.

    2. Width of corrugated board. As a rule, it is customary to distinguish between two types of widths for sheet-type material. This:

    • total - that is, the full size from edge to edge;
    • useful is the size, minus the overlap that is formed during installation, therefore this parameter is also called the installation width.

    As a rule, the useful width differs from the total width by approximately 4-10 cm. Manufacturers indicate these parameters in the instructions for the material, as well as the recommended overlap size when installing the product on slopes with different angle tilt The standard width is considered to be in the range from 98 to 185 cm.

    3. Length of the profiled sheet. Since this is a rolled material, the length can be quite large, including custom-made products. Parameters from 40 cm to 14.5 m are considered standard. It is most convenient to work with sheets whose length is 3-4 m. It is recommended to choose a corrugated sheet whose length would be equal to the length of the slopes plus an allowance for the eaves overhang. If the rays have quite longer length, then you can make additional horizontal docking. In this case, the specific size of the overlap will depend on. For example:

    • angle less than 15 degrees – overlap more than 20 cm;
    • angle 15-30 degrees - overlap 15-20 cm;
    • angle more than 30 degrees - overlap 10-15 cm.

    Calculation of corrugated sheets for roofing

    Due to the fact that the profiled sheet is produced various sizes, you can cover the roof from the ridge to the edge of the overhang with solid sheets. This eliminates the process of cutting sheets, as well as unnecessary height joints. That is, to calculate the required amount of material, it is necessary to take into account parameters such as:

    • width of the slopes - calculated according to the length of the ridge beam;
    • the length of the slopes is the distance from the eaves to the ridge plus the eaves overhang.

    To calculate the number of sheets, you need to divide the width of the slopes by the useful width of 1 sheet of corrugated sheet. In this case, the resulting amount should be rounded to a whole number. In order to calculate the area (in sq.m.) of the coating, the resulting number of sheets should be multiplied by the length and total width. It is worth noting that it is quite easy to calculate the amount of material for a simple shed or gable roof. However, if there are a large number of slopes on the roof various shapes and additional elements, for example, in the form skylights, then it is recommended to entrust the calculation to professionals. Since in this case it will be necessary to determine the area of ​​​​each element, then make a drawing and calculate the required amount of material on the project. It is important to say separately about. Their approximate consumption will be 30-50 pieces per 1 sheet of corrugated sheeting. That is, for 1 sq. m. of coverage it is recommended to use 5-7 fasteners. In addition, 1 linear meter of additional elements will also require 3-5 self-tapping screws. It is most convenient to make calculations in special calculator programs, which can be found on many specialized sites on the Internet.

    Programs for calculating profiled sheets

    If you don’t trust your own engineering and mathematical skills, you can always play it safe in your calculations using special online calculators. In such programs, the calculation of a roof made of corrugated sheets is done quite quickly. In this case, the roof can even have a complex configuration; the program will automatically calculate the required amount of material for each slope. To get started with one of these services, you need to know certain parameters. In particular, we are talking about such quantities as:

    • building length;
    • width of the house;
    • roof length;
    • roof height;
    • number of stingrays;
    • size of overhangs on each side;
    • area of ​​openings, if any.

    By entering all the values ​​in the required fields, you can easily calculate the roof parameters. If you want to find out how much corrugated sheeting with certain parameters will be required for specific slopes, then you must also enter the following values ​​into the program:

    In addition, many online calculators allow you to calculate the cost of materials, including the necessary ones. To determine this, it is enough to enter the price for 1 sheet in the program or for 1 sq.m of product, and also indicate how much a package of self-tapping screws costs and how many there are in a pack. Then all that remains is to look at the calculation results and go to the store to purchase the required number of products. However, it should be understood that when purchasing, be sure to make a supply of materials of approximately 10%. This allows you to cut sheets of corrugated sheets without worrying about ruining anything, and also without saving on fixing elements if the need arises. After all, it is always better to strengthen the covering on the roof reliably, this will help make the work more efficient and further operation as safe as possible.

One of the most popular materials for roofing is corrugated sheeting, 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 sheeting. In order for the roof structure to effectively perform its functions and be sufficiently reliable, it must be correctly calculated. How to correctly calculate corrugated roofing will be discussed in this article.

Roof design

Corrugated sheeting is actively used for installation 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, which determines the ability of the structure to withstand snow masses and wind loads.

The slope of the roof slopes affects two indicators:

  • The thickness and depth of the corrugated board relief;
  • 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 greater wind load due to increased windage, but at the same time the structure is less susceptible to precipitation, which can independently slide down the slopes. Taking these factors into account, you can determine the thickness of the profiled sheet - for example, when the slopes are inclined over 45 degrees, sheets of smaller thickness are required.


If the roof has a slight slope, then it will have to be cleaned regularly. This design will require thicker sheets that can withstand the combined weight of the snow and the person clearing it. According to standards, the minimum slope of a corrugated roof can be 12 degrees. The layout of the corrugated sheets on the roof in this case will be standard, but it is strongly recommended to treat the sheets at the joints 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 amount of overlap can decrease 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 shortage of profiled sheets will require an extraordinary purchase of the missing elements. To prevent such situations from arising, you need to calculate the area of ​​​​the corrugated sheet in advance.

Programs for calculating quantities of material

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

  1. Very fast execution calculations;
  2. The ability to determine all the parameters of the roofing covering;
  3. The ability to compare individual roof elements at the design stage;
  4. Possibility of carrying out calculations for roofs of the most complex configuration.


A good program for calculating a roof made of corrugated sheets allows you to select the most suitable arrangement of sheets and the method of their fastening. When using sheets different color the program will allow you to combine them with maximum implementation of decorative properties.

Roof installation from corrugated sheets

Of course, programs give maximum results, but the calculation of the amount of profiled sheets can be carried out without them - it’s 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:

  • Number of roof slopes;
  • The area and shape of each roof slope;
  • The slope of the slopes.


  • Skate;
  • Ridge strip;
  • Ridge cap;
  • Roof rib;
  • Endovu;
  • Valley plank;
  • Cornice and front overhangs;
  • Cornice strips;
  • The ends of the slopes;
  • End strips;
  • Adjunctions.

How to calculate how much corrugated sheet you need

As mentioned above, calculating how many sheets of corrugated sheeting are needed on the roof is not so difficult. 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 ​​all slopes has been calculated, all that remains is to sum them up. After this, the lengths of all the extreme elements of the roof are determined - the ridge, overhangs, etc.

  • Overall width, which is 1180 mm;
  • Useful width, which is 1100 mm.

When making calculations, 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 to a larger value.

When using the calculation method described above, the amount of overlap is 8 cm. This value is not relevant in all cases - the vertical overlap can vary depending on the corrugated sheet used and the wave pitch. So, for sheets of grades C-8 and C-10, the overlap should be 2 corrugations, while other grades can be overlapped 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, sheet C-10 should be laid with an overlap in two waves, and with a larger slope, the overlap can be reduced to one wave.

When all previous calculations are completed, it is time to calculate the number of horizontal rows of corrugated sheeting. 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 the creation of a solid structure.

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

Calculation of additional elements for metal profiles

When calculating materials for the roof, knowing how many squares are in the corrugated 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 total length all slopes and divide the resulting value by 1.9 (the value is exactly this due to 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 subsequently 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 are used to fasten corrugated sheets, protecting the holes from water penetration. The number of fastenings is calculated simply - for one square meter of covering, about 7-8 screws are required, and for additional elements - exactly 8 screws for one. Knowing the roof area and the number of additional parts, calculating the number of fasteners is not difficult.

Conclusion

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

Profiled sheet is a modern roofing material, which is corrugated sheets of galvanized steel with 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 corrugated roofing and cut it correctly, 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 roof slopes, but these calculations can be done independently without using a calculator. In this article we will tell you how to independently calculate the required amount of corrugated sheets.

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

  • Thickness of the profiled sheet. On structures with a slope of less than 45 degrees, snow lingers on the slopes, creating an additional weight load on the covering and rafter frame of the structure, so thick corrugated sheeting is used for them. The steeper it is, the thinner the corrugated sheeting can be used to cover it. Corrugated sheets made from thick steel blanks have 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 reflecting the magnitude of the roof slope, since the laying scheme of the coating depends on it. The corrugated sheeting is laid overlapping so that the joints between it are airtight. The steeper the roof slopes, the smaller the recommended overlap. For structures with a slope of 12 degrees, it is recommended to maintain an overlap of 25-30 cm, which reduces usable area one sheet and increases material consumption.

Note! Designing and accurately calculating the required amount of corrugated sheets helps reduce costs for roofing materials, avoid errors when cutting and minimize waste. An online calculator will help simplify the calculations; you just need to enter the dimensions, number and slope of the structure. When determining the optimal shape 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 publicly available, can calculate in a matter of seconds how much corrugated sheet metal will be needed to construct a structure. To do this, just enter the initial data: the number of slopes, their shape, size, and slope. The programs allow you to perform calculations quickly and accurately enough; in addition, they have additional functionality:

  1. Quick and accurate calculation of the required materials for roofing of complex shapes.
  2. Automatic construction of a roof diagram and optimal cutting of the covering.
  3. Possibility of changing some parameters and comparing results in order to reduce material consumption and costs.
  4. Opportunity precise definition the required number of additional roofing elements made of corrugated sheets (ridge profile, caps, abutment strips, valleys, wind strips).

Please note that machine calculations are highly accurate and allow you to quickly visualize your roof design. How more complex design roofs, the greater the error of manual calculations, therefore, to calculate the required amount of materials for multi-slope structures, it is better to do it using a calculator program.

Main settings

The principle of calculating the required number of sheets for covering a roof 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, to calculate the roof area, you need to multiply its width by its length. If the roof is asymmetrical, then the calculation is performed separately for each slope in order to avoid errors in determining the required amount of corrugated sheets.
  • Area of ​​corrugated sheet. When calculating the required amount of material, the useful area of ​​the corrugated sheet is taken into account, and not the total. This indicator reflects the deduction of overlaps; it depends on the brand, quantity, wave height of the roofing and the slope of the structure. The fewer waves the material has and the lower the slope, the lower this indicator and the greater the consumption of corrugated sheeting.

Important! When calculating the required amount of corrugated sheeting, 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 roof slope. The calculator program performs calculations more accurately, since it calculates this corrugated sheet indicator in accordance with the roof design.

Counting technology

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

  1. 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.
  2. Then the total roof area is determined by adding the area of ​​the individual parts. If the roof is symmetrical, then this is easier to do.
  3. Calculate the useful area of ​​the corrugated sheet taking into account the amount of horizontal and vertical overlap.
  4. Determine how much material is required by dividing the total surface of the roof by the usable area of ​​one sheet. This figure is rounded up.
  5. They estimate how many sheets are needed for a horizontal row of the roof by dividing the width of the slope by the useful width of the profiled sheet.
  6. Estimate how many sheets of horizontal rows will be required. To do this, the length of the slope is divided by the useful length of the material.
  7. In conclusion they count required amount additional elements, taking into account that their standard length is 2 m, and the recommended overlap is 10-20 cm.

Experienced craftsmen claim that there is a way to make it easier to calculate corrugated sheeting for roofing. To do this, you need to purchase corrugated sheets, the length of which corresponds to the length of the slope. This technology allows you to reduce horizontal overlaps and also reduce material consumption.

Video instruction

Corrugated sheeting is a widely used roofing material for both industrial and civil construction. Relatively low cost, light weight, manufacturability, ease of installation and good performance characteristics attract many developers. Most expensive types profiled sheets are not inferior in terms of service life high-quality metal tiles, but they benefit significantly in terms of cost.

This is explained simply. Metal tiles have large projections; to give such a profile, the steel must have high ductility. For the manufacture of metal tiles, only high-alloy steel grades are used.

The metal profile does not have such a complex pressing geometry; therefore, lower quality and cheaper steel is suitable for production. Due to the difference in materials, the cost of production is reduced. All galvanizing and coating indicators polymer paints and other additional protection of surfaces from corrosion processes for both roofing materials are completely identical, and it is these coatings that affect their durability.

Roof made of corrugated sheets

Prices for corrugated sheets

The calculation methods are influenced by the following indicators of profiled sheets.


How to use the calculator

The fastest and easiest way to calculate corrugated roofing is to use a special calculator. Before starting work, you need to decide on the type and technical parameters of the sheet and roof. The calculator will require the following initial data:

  • sheet size, this does not mean general, but only effective (working);
  • linear dimensions of rectangular slopes and their number;
  • linear dimensions of triangular slopes (hips) and their number;
  • sizes of trapezoidal slopes and their number.

The calculator has a simple program, allowing him to determine the area of ​​each geometric figure and sum them up. Professional roofers rarely use such calculations. No computer program can take into account all individual roofing options; too many unforeseen factors influence the final calculations.

This calculator should be used with great caution, and then only to obtain indicative values. It does not take into account the length of the sheets, and the number of joints depends on this. The calculator does not take into account the angle of inclination of the slopes, and this parameter affects the width of the overlap, etc.

A practical example of roofing material calculation

You can calculate the number of profiled sheets using trigonometric formulas. But not every older builder can remember what arctg or cos are, where to look for them and what to do next with them. We offer the simplest calculation method; to use it, you only need to know first-grade arithmetic lessons.

For example, let’s take the simplest and most popular roof – a gable roof.

Note that there is no difference between calculating the amount of corrugated board and metal tiles, roofing materials have the same installation technology, the same additional elements and fixing methods, and identical performance characteristics. The appearance and price are slightly different, but these parameters do not affect the calculation method. For a better understanding, the instructions give the dimensions of the roof, and in your calculations you should use the parameters specific type metal tiles and rafter system.

Step 1. Find out the sheet sizes. The manufacturer indicates the total and working width of the sheets. The working width takes into account the size of wave overlaps during installation. In our case, the total width is 119 cm, and the working width is 110 cm. A wider wave will always lie on top, thereby ensuring a tight fit. The upper wave completely covers the lower one - eliminating the possibility of snow or rain getting into the under-roof space. The corrugated sheeting does not have waves, it only has ridges located parallel to each other at the same height, which somewhat simplifies the calculation process; there is no need to take this parameter into account when selecting the ridge element and wind strips. For profiled sheets, you can buy strips with lower sidewall dimensions; they close the small gap between the roof and the sheathing.

Step 2. Measure the dimensions of the rafter system. In our case, the distance between the two extreme rafter legs 11 m 67 cm, and the distance between the walls of the building is 10 m 60 cm. The house is quite large, rafter system must be made according to all the rules, to ensure the necessary load-carrying capacity and rigidity.

Important. In order to reduce the amount of unproductive waste of corrugated sheets and facilitate roofing work, it is recommended to adjust the dimensions of the sheathing to the dimensions of the corrugated sheets. This will not only eliminate the need to adjust the sheets, but will also improve the appearance of the roof. It will be symmetrical, the screws will be located at an equal distance. Another problem with cut sheets is that the cut metal in the cut areas quickly oxidizes. The size of the rust is not critical; the metal does not deteriorate very quickly. The problem is that rust is washed off with water onto the roof covering and forms unsightly red streaks. It is impossible to remove them; iron oxides are firmly etched into the surface of the coating.

Step 3. Count the number of metal profile sheets. In our case, you will need 11 pieces for the roof. × 110 cm + 90 cm = 12 m 19 cm. During the calculations, it was taken into account that 11 sheets with a working width of 90 cm are not enough, therefore it is necessary to increase the coverage by 9 cm and thereby achieve roof dimensions along the ridge of 12 m 19 cm. In this case, the overhang along the ridge will be 12 m 19 cm - 10 m 60 cm = 159 cm / 2 = 79 cm. If such a distance seems large, then it can be reduced to acceptable parameters by a multiple of the wave width of the roofing material. As a result, after choosing optimal option the length of the roof ridge turned out to be 12 m 1 cm. Taking into account the size of the sheets, the sheathing under the roof should have dimensions of 12 m 1 cm along the ridge and 7 m 97.5 cm along the slope of the slope.

Step 4. Mark the length of the ridge and transfer it to the opposite underside of the roof (eaves) at a distance of 7 m 97.5 cm. Carefully check the corners, they should be perfectly rectangular. If the first row lies unevenly, then all the rest will be steps. Straightening sheets by slightly shifting the floor profiles is very difficult and is categorically not recommended by manufacturers. If they are not on the same line, several problems will arise.

  1. The gaps in the places where the sheets overlap will increase, and there will be a risk of snow or rain blowing in. To eliminate the problem, it is necessary to increase the length of the overlap of corrugated sheets, and this changes all calculations and increases the consumption of expensive roofing materials.
  2. In places of bending, the sheets touch each other not along the surface plane, but along a line. This situation causes significant loads along the lines; the thickness of the profiled sheets is not designed for them. As a result, the coating may sag in these areas, the protective layers are damaged, and the oxidative processes. In the future, leaks appear at such points, requiring roof repairs.

The correct angle of the sheathing must be checked by measuring the diagonals of the rectangle. If there is a difference, then only the eaves portion of the sheathing can be shifted in one direction or another; the ridge portion must always be stable.

Practical advice. Before placing an order, you need to talk with a representative of the manufacturer. The length of the sheets must be agreed upon, and in some cases it will have to be changed depending on production capabilities and delivery difficulties. If you buy ready metallic profile standard sizes, then it is necessary to take into account the amount of overlap depending on the angle of inclination of the slopes.

Step 5. Calculation of additional elements. They must be ordered at the same time as purchasing the roof. Most manufacturers produce elements of standard sizes, one and two meters long. To completely install a gable roof, you will need these additional elements.

Name of additional elementCalculation algorithm

In our example, the length of the roof ridge is 12 m 1 cm, you should buy equal amount pieces plus one element in reserve for covering. If the skates are two meters, then 6+1 pieces are required. For the ridges, immediately buy plugs of the appropriate profile and seals or special grilles that do not allow birds and large insects to enter the under-roof space.

Installed at the bottom of the roof, it is designed to protect the sheathing from moisture. In addition, cornices perform a very important decorative function. The number is calculated in the same way as for the ridge, but you must keep in mind that these strips are attached to both sides of the roof, total doubles. In stock for overlaps, you can take not two planks, but one. Of course, if the total amount of overlap allows such savings.

One side is fixed to the board, and the other to the sheet wave. The main task is to protect the roof from explosions by strong gusts of wind. Additional – improve the roof design. The calculation is not difficult, keep in mind that the wind slats are screwed on four sides of the slopes.

The roof of the house is large, snow load can reach significant values. It is recommended to buy tubular elements; they have a special rigid design for fixation and can withstand significant forces. Thin corner snow holders, with significant effort, deform profiled sheets, and in some cases can completely tear out the screws. Through holes appear in the roof, it is required urgent repairs. It must be remembered that repairing the coating will always cost tens of times more than purchasing a reliable snow guard. The number of elements is selected taking into account their length; they should be placed across the entire width of the roof, it is advisable not to take breaks between them.

This completes the preliminary calculations for the roof. You can multiply the number of elements by their price and get the cost of the roof. But it's not that simple. Why? Because the price of a roof includes not only the cost of covering, you need to take into account the full construction estimate and make the most complete calculation possible.

How to calculate the total estimated cost of a roof

Some inexperienced developers quickly calculate the cost of purchasing metal tiles, add the cost of additional elements, and hope that for this amount they will be able to install the roof of their house. And then, during the construction process, it turns out that the actual amount is many times higher than the planned amount, great difficulties arise with financing the project, and sometimes construction has to be frozen. Any temporary suspension construction work Due to the lack of materials, it incurs direct and considerable losses. After the resumption of construction work, many elements have to be repaired or completely redone, and this is an unnecessary loss of money.

In order to avoid getting into unpleasant situations, you need to be able to correctly calculate the cost of a roof. How to do it? To make the example clearer, we will take real prices for metal coatings as of the summer of 2017.

Where does the calculation of corrugated roofing begin?

Usually the total roof area is calculated, then the number of sheets and additional elements is determined, and the data is multiplied by the cost. For example, with a roof slope area of ​​200 m2 and an approximate cost of profiled sheets of 300 rubles/m2, it is determined that 60 thousand rubles will be needed for the roof.

To cover various unforeseen expenses, the amount increases by another ten percent, and the developer is confident that this is quite enough to furnish the roof of the house. The amount is small family budget withstands it without problems. More experienced ones will also estimate the cost of lumber, and that’s where the calculations end.

Is it possible to do this, will the amounts received coincide with the real ones? Let's figure it out. Let's talk about which items make up the cost of a roof, what you can save on, and where you don't need it. There is a house with a pitched roof with an area of ​​200 m2; a budget metal profile costs approximately 300 rubles/m2.

The roof is the cheapest bet insulation, attic spaces non-residential We specifically chose this simplified option in order to find out the minimum cost of the work.

Step 1. Let's calculate the cost of lumber for the rafter system. We will not count exactly down to each board and batten of the sheathing.

Based on practice, such a roof will require approximately 9 m3 of lumber, the cost of a cubic meter of first-grade boards is within 7.5 thousand/rub. In total, after basic calculations, we find out that for the rafter system we need 67.5 thousand/rub. for lumber.

Prices for various types of construction boards

Construction boards

To build the structure, various fasteners are required, the amount is 5 thousand / rub. also take from practical experience. This is the minimum cost of fasteners, but in fact it is rare that any master fits into it.

To this amount should be added the cost of delivery of materials to construction site, specific values ​​depend on the length of transportation. We will take a minimum price of 2500 rubles.

Delivery of lumber is another expense item

Total, at this stage you will need 67.5+5+2.5=75 thousand rubles. This amount is already beginning to worry some developers, because they thought that the price of lumber did not have a noticeable effect on the roof; when calculating profiled sheets, they often did not take it into account.

Step 2. Calculation of roofing covering. As we have already mentioned, a budget option for materials is being considered. During calculations, the percentage of waste should be taken into account, and it will always be there.

In our case, the roof area is 200 m2, taking into account the stock and complexity of the roof, you will have to buy approximately 232 m2 of profiled sheets.

Let's multiply the quantity by the price and get a sum of 69.6 thousand rubles.

To this we must add the cost of roofing fasteners (approximately 4 thousand rubles), the resulting amount is approximately 74 thousand rubles.

As you can see, the cost of lumber for the rafter system slightly exceeded the price of the roofing. And at first it seemed that this amount would be approximately half as much and that we could not pay much attention to it.

Step 3. Waterproofing membrane. An unpleasant feature of metal coatings is the formation of quite a large amount of condensation on the underside of the sheets. To ensure the durability of the roof, it is recommended to remove it; you will need a special membrane. Our roof requires three rolls of material with a total cost of 4.5 thousand rubles.

Prices for vapor barrier materials

Vapor barrier material

Step 4. Calculation of the quantity and cost of additional roof elements. You should calculate the cost of the ridge, cornice and wind strips, and chimney bypass elements. Approximate amount 16.5 thousand rubles.

Step 5. Now it’s time to pay attention to one of the most significant expense items - the cost of services construction companies. The price range is wide, the minimum price for which you can agree to build a simple gable roof is 500 rubles. behind square meter. The area of ​​our roof is 200 square meters, the total cost of roofing work is 500×200=100 thousand rubles. They charge separately for bypassing and lining the pipe; together with materials, this unit will cost at least 10 thousand rubles. Total for services professional builders you will have to pay 110 thousand rubles.

Now we can estimate that the approximate cost of a simple gable roof with a budget option for roofing materials is within 280 thousand rubles.

Do you remember what amount the calculations started with? From 60 thousand rubles. Inexperienced developers estimate the roof at this amount by eye. Keep in mind that in the calculations we did not take into account the cost of equipment and installation of a drainage and snow retention system. The roof is not insulated, there are no skylights or separate outlets for ventilation and air conditioning systems.

Price drainage system approximately 48 thousand rubles, the price of tape under the ridge is 11 thousand rubles, hemming overhangs with soffits is 33 thousand rubles, perforated tape for protection ventilation ducts from large insects and birds 4 thousand rubles. snow guards 22 thousand rubles. In total, minor work requires significant money - at least 118 thousand rubles. along with installation.

Prices for snow guards

Snow guard

What's the result?

The complete construction of a roof from profiled sheets will cost approximately 398 thousand rubles, of which only 19% is the cost of metal covering. The most money will have to be paid for spotlights, gutters, tapes, films and other materials - 36%. Master roofers will receive 27% of the total amount, and the rafter system will cost 18%.

As you can see, metal roofing ultimately requires the least amount of finance construction estimate. But we calculated the cheapest and, accordingly, the least quality metal profile. Its service life does not exceed ten years. If instead you buy more expensive roofing coverings of the average price range, then the total cost will increase to 433 thousand rubles, and the entire increase is only due to an increase in the price of the roofing material. The actual increase in the estimate is only 9%. Now attention: the guaranteed service life of higher quality metal coatings increases by at least 1.5 times.

Conclusion. Only not very smart or very rich developers allow themselves to buy low-quality types of metal profiles for the roof.

Video – Installation of corrugated roofing

Galvanized steel corrugated sheeting is a popular roofing material; its advantages include affordable cost and simple installation, which you can do yourself. Roofing made from corrugated sheets is widely used in industrial and private construction. When designing a roof, it is important to correctly calculate the corrugated sheeting for the roof.

Roof design

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

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

The greater the angle of inclination of the slope, the larger area roof surfaces. At the same time, the wind load is higher due to the windage, but the snow load is lower, since the snow rolls off steep slopes under its own weight. Thus, for the manufacture of roofs with a slope angle of 45 degrees or more, you can use a profiled sheet of smaller thickness.

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

The profile brand directly affects the dimensions of vertical and horizontal overlaps, which should be taken into account when calculating corrugated roofing.

Incorrect calculation of the amount of material for roofing work 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.

Calculation programs

Specialized roofing calculation programs are characterized by:

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

Using the program you can select the best way arrangement and fastening of sheets. If you plan to use corrugated sheets various colors, software calculation will allow you to harmoniously arrange colored stripes or squares.

When designing complex roofs with a large number It is recommended to resort to software calculations or the help of professional architects.

Roofing elements made of corrugated sheets

To calculate the amount of corrugated sheeting on the roof country house, barn or garage, you don’t need to use a program, you just need to use certain mathematical formulas and know some subtleties. The accuracy of the calculations will be somewhat lower, but when installing simple roofs this is not significant.

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

  • the number of roof slopes (sloping surfaces that provide rainfall drainage);
  • 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 (an edge formed by the horizontal intersection of slopes);
  • ridge strip (covers external roof fractures, protecting them from precipitation);
  • ridge cap (protects against moisture penetration under the roof);
  • ridge (edge) of the roof (external corner at the junction of the slopes, located at an angle to the horizon);
  • valley, or groove ( internal corner, formed by the intersection of slopes);
  • valley plank (used to drain water);
  • cornice and front overhang (edges of the roof covering protruding beyond the plane of the wall);
  • cornice strip (protects the sheathing, front board from precipitation, removes moisture into the gutter;
  • end (sides of the slopes);
  • end strip (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 sheeting for a roof? The roof slope (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 lengths of the ridge, ribs, valleys, abutments, 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 obtained is rounded up. With this calculation, the overlap of the material is 80 mm (the total width of the sheet minus the working width).

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

When calculating the number of sheets in a horizontal row, we must not forget about the designed width of the gable overhangs (roof projections beyond the plane of the wall).

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

Additional items

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 up the lengths of the slopes on which they will be installed, and divide the resulting value by 1.9. The overlap taken into account is 10-20 cm.

When calculating 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 roofing structure. It is recommended to immediately calculate the minimum required number of fasteners - self-tapping screws with special rubber gaskets that protect the fastening points from moisture. One square meter of corrugated sheeting requires 7-8 self-tapping screws. 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, you can install the roofing in one step, and also minimize the amount of waste and unused material.

How to calculate corrugated roofing - the correct method

In recent years, corrugated sheeting has been increasingly used as roofing. The reason for this is excellent quality material, which is strength, durability, reliability and excellent appearance. The advantage is also that corrugated sheeting is quite easy to work with. Installing a roof does not take much time. But in this case, as a rule, the question arises: how to calculate corrugated sheeting for the roof. It must be remembered that all calculations must be made with maximum accuracy and adhere to laying technology. Otherwise, problems with material shortages may occur. At the same time, it is not uncommon for the purchased material to differ in color and texture, since it belongs to a different batch. This can significantly complicate the installation of the roof.

Calculation of corrugated sheeting for the roof

Thus, the main nuance of laying corrugated sheets is the correct calculation of the required amount of material for roofing work. It is this moment that will help to avoid many consequences associated with a shortage of corrugated sheets and other additional materials. If you incorrectly calculate the required amount of material, the consequences will be unnecessary unforeseen expenses for the purchase of material, its delivery and wasted time.

That is why you should approach the issue very seriously and make the correct calculation of corrugated roofing. This will also help answer the question: how much does it cost to cover a roof with corrugated sheeting.

Some developers prefer to do calculations using special programs. In principle, electronic payment has its advantages. Let's consider the main ones:

  • the result is the most accurate result;
  • by using electronic program it is possible to make calculations of even very complex structures;
  • Most programs, in addition to the total roof area, also calculate the slope of the roof, interlocking ceilings, and material overlap.

In addition, using a computer program, it is possible to calculate the required amount of material for several roof options at once, while changing and selecting certain roofing elements.

Thus, as a result of careful selection, fitting of one or another roof option, changing the parameters of certain roof elements, it is possible to select the most profitable option.

It will not be difficult to calculate the amount of corrugated sheeting of different colors and textures, alternating stripes and squares. Of course, this program is not used so often to calculate the roof of an ordinary country house. It is usually used to calculate technical parameters roofs of large buildings, with quite complex and original elements.

How much does it cost to cover a roof with corrugated sheeting?

Having calculated the roof area, it will not be difficult to calculate how much it costs to cover the roof with corrugated sheeting. To do this, the resulting number should be divided by the usable area of ​​one sheet. The result is multiplied by the price. It's simple. The area of ​​the corrugated sheet will be discussed further below.

Self-calculation

Still, many people wonder whether it is possible to calculate the required amount of material for the roof without using any software. In principle, there is nothing particularly complicated or unusual in this, but it should be remembered that the accuracy of the calculations may be somewhat lower as a result. However, for a small technical building, a bathhouse, a garage or a small country house, this will be quite enough, since the roofs, as a rule, have a very simple shape.

First of all, you should find out which roof elements will be present in the roof structure and will invariably affect the calculations.

So, what specific nuances should be taken into account when calculating:

  • Slope, that is, the angle of inclination of the roof, the overhang of the roof in position relative to the horizon;
  • The slope of the roof, that is inclined surface, with the help of which water drains;
  • A ridge is a horizontal outer corner in the form of an edge. A ridge is formed when crossing slopes;
  • Ridge strip Designed to cover external fractures. The ridge strip provides protection from various precipitation;
  • The ridge cap is designed to protect the under-roof space from moisture;
  • The ridge of a roof is the outer sloping angle between several slopes;
  • Endova, otherwise called valley. This is the inner corner at the intersection of the slopes;
  • Gable - the outer angle of inclination between the slope and the front;
  • The valley strip required for water drainage;
  • Ribs formed at the intersection of slopes;
  • Overhangs and cornices, that is, those edges of the roof that protrude beyond the plane of the walls;
  • Cornice strip, which is necessary to protect the front board and sheathing from natural influences, or rather precipitation. It also directs water into the drain to the gutter;
  • The ends, that is, the sides of all roof slopes. The end strip is used to protect the roof structure from destruction during strong gusts of wind;
  • The junction of the roofing material and the wall is called the junction. Junction strips are necessary to protect structural elements at the junction of pipes and other elements from the penetration of precipitation;
  • Snow retainers necessary to ensure safe living in the house in cases where snow masses may descend from the roof, that is, in winter time of the year.

Having understood the main elements of the roof structure, you can begin to calculate the total area of ​​the roof, taking into account its shape. We break the entire roof into separate geometric shapes. Next, you need to calculate the area of ​​each resulting surface. After this, you need to add up all the results obtained.

Please note that calculating geometric shapes is not particularly difficult. To do this, you only need to know how to find the area of ​​triangles, rectangles, squares and other simple elements.

The lengths for various bends, cornice and end overhangs are also determined. Inflection lines are valleys, ridges, junctions, ridges.

Please note that when calculating the required area of ​​a steel roofing sheet, you should take into account the fact that corrugated sheeting essentially has two meanings. The first is the useful width, that is, the working width. It is equal to 1100 mm. And the total, that is, the full width of the sheet is 1180 mm.

Calculation of the number of roofing sheets

The next step is to determine the number of sheets of roofing metal. The calculation is made as follows: divide the length of the entire slope by the width (working). The result should be rounded up. At the same time, when making this calculation, it is necessary to take into account the overlap of the material. This is done as follows: subtract the working length from the total length. It turns out: 1180 – 1110 = 80mm.

Next, we calculate the required number of sheets in one row, as well as their length. The length is equal to the sum of the lengths of the eaves overhang, slope and vertical overlap. In this case, the vertical overlap is 150 mm, and the overhang of the cornice must be at least 50 mm. In this case, the shortest length can be 500 mm, and the longest, that is, maximum, can be 6500 mm. However, the optimal option is considered to be one that varies from 4000 to 4500 mm. The effective length must be calculated taking into account wave impacts and overlaps.

Remember that the profiled sheets must be positioned horizontally. If you do not take this fact into account when calculating, the results will be incorrect.

The next step is to calculate the various additional elements needed to install the roof. Their standard length is, as a rule, 2 meters. First of all, all the lengths of the slopes on which these elements will be installed are added up. Then the result is divided by 1.9. This takes into account an overlap of 10 cm.

If a calculation is made for the valley, then the result is divided not by 1.9, but by 1.7. The overlap is taken to be at least 30 cm, and the resulting result must be rounded up.

To start roofing work, you also need to know the required number of screws. The calculation is quite simple. At 1m? About seven or eight pieces of corrugated sheet are required.

Please note that self-tapping screws with rubber tips should be used to fasten the steel.

Thus, we need to multiply the number 8 by the resulting area. The result will be the required quantity.

Knowing the roof area, they calculate not only the roofing material, but also waterproofing film, insulation. This will also help you calculate how much it costs to cover the roof with corrugated sheeting.

To summarize, it should be noted that all independent calculations must be carried out as accurately as possible. This will ensure quick and high-quality installation. Not required additional expenses for purchase additional material. It will also waste much less time, so you won’t have to redo anything.


If you choose corrugated sheeting for roofing, one of the first questions that will appear will be “How to calculate corrugated sheeting for a roof?”, and “How much does it cost to cover a roof with corrugated sheeting?” Find answers to these questions in our article!

We calculate corrugated sheeting for the roof

Corrugated sheets in Lately very popular building material. It is universal, which is why developers give preference to corrugated sheeting when constructing fences, buildings, and roofing. Corrugated sheets are affordable, easy to install, and have a very presentable appearance. Roofing made from corrugated sheets is widely used in both private and industrial construction. However, in order to cover the roof with them, you need to correctly calculate the corrugated sheeting for the roof. How to do it? Let's figure it out.

Common parameters

In order to determine what working area will be covered with corrugated sheeting, you need to understand the parameters building material. Thus, the working width of profiled sheets is 110 centimeters. The total (total) width of the sheets is 118 centimeters.

To determine the number of sheets to cover your roof, you need to take measurements. First of all, measure the length of the slope. The resulting value should be divided by the width of the sheet. We round the figure, and round it up.

Be sure to take into account overlaps of materials. To make these calculations, subtract the working width from the total width: 118-110 = 8 centimeters.

Next, we calculate the profiled sheet - the length and number of sheets in one row. The correct calculation of corrugated sheeting always takes into account that the length is the length of the overhang of the cornice (it is not shorter than 5 centimeters), the vertical overlap (15 centimeters), and the slope. The smallest roofing material (corrugated sheet) has a length of half a meter, the largest - 6 meters. The roof is always covered with a profiled sheet in a horizontal order.

Do not forget about the calculation of additional elements that will definitely be needed when constructing the roof. Their length according to standards is 2000 millimeters. First, measure the length of all the slopes on which you plan to install these elements. Then add up the resulting values, divide the resulting result by 1.9, do not forget to take into account the overlap of 10 centimeters. When calculating the valley, we divide by 1.7, taking into account an overlap of 30 centimeters. Round the results up. When calculating self-tapping screws, remember: one square meter of corrugated sheet takes about 8 pieces of fasteners.

This is a calculation of corrugated sheets for standard roof configurations. However, sometimes builders prefer to erect non-standard roofs on their buildings. In this case, the calculations are carried out a little differently. To avoid mistakes, draw up a drawing respecting the scale. Determine the area of ​​each element (this is required condition). The calculation is performed separately for each element. Next, the resulting numbers are summed up.

Additional calculations

Calculation of beams for sheathing

Installation of corrugated sheets always takes place on the sheathing. It consists of boards pre-treated with an antiseptic. For this reason, count roof covering They start with wood boards. Their thickness should not be less than 2 centimeters. The lathing step when laying it is 20-30 centimeters. How much wood will those who deal with roofs need? This depends on several parameters. The first is the length of the slope. The second is the step of installing the crossbars (usually from 50 centimeters), which takes into account all the loads that will be placed on the roof, the profile height, and the thickness of the profiled sheets.

Calculation of overlaps

Next, vertical and horizontal overlaps are calculated. In this case, the vertical overlap takes into account a profile made with wave overlap (the step depends on the marking). The horizontal overlap takes into account roof slopes. So, if the inclined angle is 12-150 degrees, the overlap is more than 20 centimeters. If the slope is from 15 to 300, an overlap of 15-20 centimeters is applied. If the slope is above 300 degrees, the overlap is at least 10 and no more than 15 centimeters.

Sometimes builders work on roofs with a slope of less than 120 degrees. In this case, installation involves sealing all overlaps with silicone sealant.

Calculation of the size of overhangs

The size of the overhangs will depend on the profile height of the roofing material. A simple rule applies here: the higher the profile height, the longer the overhang (only if this condition is met, moisture will not get under the roofing material). In addition, the height of the corrugation affects the loads that the corrugated sheet can withstand: the higher the corrugation, the greater such loads can be.

Industrial buildings require the use of corrugated sheets with a profile height of more than 44 millimeters; in this case, the lathing is carried out taking into account a step of 2-3 meters.

If you are installing the roof of a private house, choose corrugated sheeting with an average profile height. The sheathing pitch on such roofs is 1500 millimeters. With a smaller profile height, the lathing pitch is reduced.

Calculation of fasteners, hydro- and thermal insulation

This includes the calculation of fasteners, insulation, and waterproofing materials. With self-tapping screws everything is simple, we talked about this a little earlier. The average calculation is based on the fact that about 8 fasteners are used per square meter of roofing. As for fastening additional elements, everything is also very clear here: about 4 self-tapping screws are used per linear meter of such elements.

A fairly important and responsible step is the calculation of insulation and waterproofing material. To make the calculations correctly, you need to take into account all the types and characteristics of the selected profiled sheet and the roofing area.

Online calculator

Calculation programs

So, now you know how to manually calculate the materials needed for a corrugated sheet roof. However, recently there are many computer programs that make this work easier to a great extent. In particular, there are special programs that can be downloaded from the Internet, and there is also an online calculator for calculating roof materials.

Such, computer programs, have a number of advantages. Firstly, all the results obtained will be accurate, one hundred percent. Secondly, you don’t have to worry about making mistakes when calculating even the most complex types of roofs. These programs are able to calculate everything in the smallest detail - overlaps, roof slopes, locks, and so on. Of course, they also calculate profiled sheets.

You can easily calculate the material costs for several buildings at the same time. You will also appreciate the ability to change the location and fastening of sheets and the dimensions of roofing material in the program. This will make it possible to choose the most suitable material, with which the roof will not only be functional, durable, but also very attractive. You can do not just calculate the material, but with the help of the program you can select a wide variety of colors, shades, and combine unimaginable patterns on your future roof.

According to experts, using programs to cover small buildings is not entirely advisable. But when constructing large buildings, such programs will definitely come in handy, help you out and make your work much easier.

Calculation of corrugated roofing: online calculator


How to calculate corrugated sheeting for a roof? Additional calculations necessary materials, including fasteners and additional elements. Manual calculation and calculation using computer programs.