How to calculate a profile sheet by quadrature. Calculation of the amount of corrugated sheeting on the roof: recommendations from experts

This type of roofing materials is one of the most reliable and affordable for roof cladding. It has a fairly wide range of uses - corrugated sheeting is used when finishing large and small retail space, high-rise buildings, country houses. Its color range allows you to create design projects, which will add sophistication to the finished building and, in addition, protect the roof from leaks.

It is safe to say that this material has no drawbacks. However, for quality performance roofing works we must learn as much as possible about its features as well as the technology calculating the amount of corrugated sheeting we need .

Technical features

As a rule, such products have a galvanized surface of the main sheet. It is absolutely not susceptible to corrosion, so it allows the metal to retain its original properties for a long time. Then a layer of polymer coating is applied to this surface (in some models it can be replaced by ceramics), which serves as additional protection against mechanical damage.

The final stage of corrugated sheeting production will be the application decorative covering- this can be rubber-based paint or sprayed with anti-corrosion agents. During operation, the finishing layer can be periodically updated independently. For this it is recommended use paint brushes or a spray gun.

All parameters that must be met finished product, are described in detail in state standards. GOST also provides for the classification of corrugated sheets according to their intended purpose, according to which this material can be used for the following work:
laying of coverings;
floor cladding;
construction of fences.

Another important aspect is sheet steel thickness, from which the product is made, as well as the presence protective coating and him appearance. According to regulatory documentation, the manufacturing company undertakes to accurately indicate the size of the profile and its cross-section, sheet weight, and resistance to physical stress.

The same documents indicate the length for roofing sheeting- from 3 meters, and 2.5 meters for installing fences. The maximum permissible dimensions for both options are also indicated - 12 meters.

The profile is made from a strip of galvanized metal 1.25 meters wide and up to one millimeter thick. Due to this, after making wave bends, the product acquires a more rigid structure, which allows it to well compensate for the loads exerted on its plane.

It is advisable to use during installation work profile with deep relief, as it is less susceptible to discrepancy. It is not recommended to use decking intended for facade works, since their strength is significantly lower than the required indicators. In addition, the degree of wear affects the quality of the product. production equipment and properties of the main components. This should be monitored by the technical control department.

The procedure for calculating corrugated sheets for the roof

For stability roofing structure is influenced by several indicators, including the quality of the metal, the height of the profile walls, as well as the distance between the ribs of the sheathing. It is not difficult to calculate the strength of the product, since it is indicated on the factory packaging, but to give the finished coating sufficient rigidity, it is best to lay the sheathing bars at a distance of one and a half meters from each other.

The impact should also be taken into account weather conditions because they are main reason damage to the roof finish. Rain, snow, gusts of wind, straight sun rays- all this can cause significant damage to the corrugated sheet if its thickness is insufficient.

As for the specific numbers, the calculation is made according to a sufficient simple principle- the length of the slope is added to the distance of the protrusion at the bottom of the structure (as a rule, it is equal to 50 mm) and the amount of overlap equal to 200 mm, and then divided by the length of the sheet. The result is required quantity sheets.

To make it clearer, let's look at a simple example. Let’s say the length of the slope is 8 m, the dimensions of the sheet are 4.5 m. Then the calculation formula will look like this:

(8000 mm + 50 mm + 200 mm) / 4500 mm = 1.83 pcs.

As a result, we get two sheets of corrugated sheets for vertical laying.

For horizontal calculating profiled sheets the formula will look different. The width of the slope must be divided by the estimated width of the profiled sheet. Let's take, for example, profiled sheet H57-750, for which the actual width is 801 mm, but taking into account overlaps, the calculated width will be 750 mm (values for other profiled sheets are in the table above). Those. If we take a slope 3 meters wide as an example, we get:

3000 mm / 750 mm = 4 pcs.

If the roof structure has complex shape, then all calculations are carried out for each of its sections separately. At the same time, during installation work it is recommended to use only intact materials, otherwise the structure will not be airtight enough.

Based on the above information, we can conclude that necessary calculations You can do it yourself. If we need to know the amount of materials for complex structures, then you can use special programs.

Corrugated sheet with polymer coating widely used for roofing private houses and outbuildings. Before purchasing roofing material, you need to decide on the size of the sheets and correctly calculate their quantity. To do this, you can use or perform calculations manually.

The best way is to make several calculation options and compare the results.

Dimensions of corrugated sheets

The peculiarity of corrugated sheeting is that, despite the different length of the sheet, its width for each type of profile is constant. In some cases, the width (about 1 m) may be greater than the length (starts from 50 cm). Therefore, the width is considered to be the size of the sheet across the profile.

Full and working width

The width is indicated by two numbers: the larger value is the full size, the smaller value is the working (useful) width. The practical meaning of the working width is to facilitate the calculation of the number of sheets according to the width of the slope. It is this size that will indicate how much gap each sheet covers, taking into account the overlap with the neighboring one.

Typically, the lateral overlap is equal to half the profile wave. For profiles with a drainage groove, the working width is selected so that the next sheet overlaps the groove of the previous one.

But the working width cannot always be taken as the initial value in calculations. In cases where there are small slopes (less than 8°) without the use of special seals, it is recommended to use a wider overlap - a wave step.

Sheet length

Length roofing sheet 0.5 - 0.6 mm thick, ranging from 0.5 m to 10 m. Usually it is supplied already cut to the length specified by the customer. In cases where the length of the slope is greater maximum size sheet, which is in the manufacturer’s catalog, the corrugated sheet is laid with a horizontal overlap (increased in length).

Calculation principle for a rectangular slope

The simplest calculation of corrugated sheeting for the following types of roofs:

single-pitched in one or two levels;
gable roofs;
broken or mansard roofs(with pediment).

The calculation is carried out according to the following algorithm:

Step 1. Roof measurements

Measure the width of the slope (W) along the ridge or cornice and the length of the slope (L) from the cornice to the ridge. For asymmetrical and multi-level roofs, dimensions are taken for each slope.

Step 2. Calculation of the number of horizontal rows

To do this, you need to divide the width of the slope (W) by the working width of the corrugated sheet and round up. If the length of the slope does not exceed the corresponding sheet size, then this will be the required number of sheets.

Example: The measured width of the ramp is 8 meters. To calculate the number of rows on one slope, the width of the slope should be divided by the working width of the corrugated sheet, which for profile C21 is 1 meter.

N = 8 m / 1 m = 8 rows

Step 3. Calculation of the number of sheets in one row

If the length of the slope is more than 5 - 6 meters, then calculate the number of sheets (K) and their length. To the length of the slope (L), taking into account the eaves overhang, add the size of the overlap (or two) and divide it into equal parts. The sum of the “parts” is equal to the number of sheets of calculated length.

At the end, you need to multiply the number of rows (N) by the number of sheets in a row (K) for each slope and add the results.

Calculator

The principle of calculating corrugated sheets for complex roofs

For complex types of roofs, calculations of corrugated sheets are usually carried out using special programs (methods). General principle The calculation remains the same - for each slope the number of sheets is calculated separately. To do this, they make drawings (on a common scale for all), and “break” each element into simple figures.

For symmetrical hipped, hipped and hip roofs the slopes have the correct shape in the form of isosceles triangles or trapezoids. Asymmetrical roofs and complex roofs with valleys (grooves) may have slopes in the form of irregular triangles and parallelograms.

Trapezoid or parallelogram:

Triangles:

From the top of the ridge, a perpendicular is lowered to the base (this is the length of the first strip). Place half the working width of the corrugated sheet along the base to the right and left.
Marks are made from the boundaries of the first strip along the base with a distance from each other equal to the size of the working width. Perpendiculars are drawn from each point to the side of the triangle. Each intersection point will determine the length of the next stripe.

The calculation results for all roof slopes are summed up. Determine the number of corrugated sheets for each length size and form an order.

Note. Consumption roofing material for symmetrical types of roofs can be optimized by using part of the trim on the opposite slope of the same shape.

Galvanized steel profiled sheets - popular building material. It is used both for cladding walls and roofs of buildings, and for erecting fences in industrial scale and private construction. The light weight of corrugated sheets and ease of installation allow you to work with this durable material yourself: without the involvement of lifting equipment and complex equipment.

How to calculate the amount of material for a corrugated roofing

Corrugated sheeting is used as a roofing material exclusively for pitched roofs. On flat roofs with a slope of less than 12° its use is impractical.

Stagnation of water on a flat surface quickly leads to metal corrosion. First, rust appears around the nails, in places of cuts and junctions, and subsequently spreads over the entire area of the sheet.

When using corrugated sheets on roofs with a small angle of inclination, you have to deal with rust problems, so flat roofs usually lay a soft roof

Even cutting corrugated sheets is undesirable due to rust, so it is important to properly plan the installation of this material on the roof in advance. If you still had to cut the sheets, then the cut line must be hidden under the ridge sheathing of the roof.

When covering roofs with corrugated sheets, it is necessary to strictly follow the installation technique so that you do not have to replace them frequently. rusty sheets new

General rules for calculating roofing sheets

There are installation standards that affect the consumption of roofing material. In this case, the characteristics of the roof itself and the brand of corrugated sheeting chosen for covering are taken into account.

Roof configuration

It is important to choose the right brand of corrugated sheet for a specific roof. The service life will depend on this metal roofing. The material parameters are determined based on the angle of inclination of the slope (s) and the pitch of the sheathing. These include:

depth of the “wave” of corrugated board;
Metal thickness and dimensions are reflected in the markings of corrugated sheets
sheet thickness - decorative models are made thinner and with shallow corrugation;
Decorative corrugated sheets are used for wall cladding or laid on a roof with frequent sheathing and a large angle of inclination of the slopes
the presence of additional stiffening ribs.
Profiled sheets with a deep wave (for example, N-57, N-60, N-75, N-114) are made with stiffening ribs along the upper, lower or both parts of the corrugation

As the angle of inclination increases, both the roof area and wind load on the material. But the snow and water melt away automatically. When installing a roof with a slope of 45° or more, it is permissible to use corrugated sheeting of a smaller thickness.

If you consider that flat roofs have to be regularly cleaned of debris and snow, and also use thick corrugated sheeting for them, which must withstand the weight of a person (and, accordingly, costs more), then the benefit of increasing the angle of the slopes becomes obvious.

Moreover, when the angle of inclination decreases, it is necessary to increase the horizontal overlap of the sheets with each other, which leads to a decrease in the useful plane.

Table: dependence of the overlap of sheets on the angle of inclination of the roof

The same principle applies to vertical overlap: the smaller the angle of the slope, the more “waves” should overlap.

The overlap can be one or two waves (depending on the angle of the roof)

If you use galvanized steel in rolls instead of corrugated sheets, then horizontal overlaps can be avoided. After all, the running length of galvanized corrugated sheets is 3 and 6 meters, and this is not always enough to completely cover the roof slopes. But you can use decorative corrugated sheets with a polymer coating: its sheets are made from 1.5 to 14 meters in length (often made to order). Only for the roof it is advisable to choose models with stiffeners.

Some brands of polymer-coated corrugated sheets are also produced in production to individual lengths

Grade of profiled sheet

Not only the durability of the roof, but also the material consumption depends on the brand of corrugated sheeting. Many calculations are tied to the brand, since the roof installation parameters depend on the rigidity of the material.

Table: dependence of vertical overlap on the grade of corrugated sheet

Table: size of cornice overhang depending on the brand of corrugated sheet

The regulatory document for the classification of corrugated sheets is GOST 24045–94. It specifies the requirements for the rolled steel from which the profiled sheet is made, as well as the dimensions, configuration and accepted marking of the finished product.

The wide distribution of corrugated sheets is due to the variety of shapes, colors and low price

The initial letters of the corrugated sheet marking indicate the purpose of the product:

The supporting profile has a higher trapezoid or wave and additional stiffening ribs in the longitudinal plane.

Some manufacturers use the letters MP or MK for marking. For example, MP-20 means corrugated roofing sheet with a trapezoid 20 mm high. The profiled sheet marked MK-20 has similar parameters, but a different corrugation shape.

The entire set of model numbers describes the geometric shape of the metal sheet:

the first number is the height of the corrugation in millimeters;
second - metal thickness;
third - sheet width;
fourth - sheet length in millimeters.

Example: profiled sheet model S-21. 0.45. 750. 11000. Explanation of markings:

profiled wall sheet;
“wave” height 21 mm;
steel thickness 0.45 mm;
sheet size 750x11000 mm.

When selecting materials for roofing, it should be understood that the division metal sheets into universal, wall and load-bearing ones is very conditional. Usually the shape of the corrugation and the thickness of the metal are taken into account, corresponding specific situation: slope angle and roof size.

The most popular brands of corrugated sheeting in private construction are:

Some symbols indicate additional features designs. For example, in the marking S-20K-1080–0.5, the letter “K” indicates a capillary groove on the edge of the sheet. With its help, additional moisture removal and ventilation are provided.

For each type of product there are rules in accordance with which roofing material is laid on the roof. The width of the profiled sheet can be general and working. Useful dimensions are those that “remain” on the roof after covering the sheets: they are taken into account in the calculations.

Corrugated sheeting is produced not only with trapezoidal corrugations, but also with wavy ones (in the form of slate). Externally, this coating looks attractive, but with a similar “wave” height bearing capacity it turns out lower.

The absence of longitudinal stiffening ribs weakens the strength of the corrugated metal sheet

How many sheets of corrugated sheets are needed for the roof?

The geometry of a pitched roof consists of rectangular, triangular and trapezoidal segments.

With all the variety of types, each roof can be externally divided into simple geometric shapes

Their area is determined by formulas well known from the school course:

The area of a rectangle is calculated by multiplying the length by the width;
The area of a rectangular roof section is calculated using the formula: length multiplied by width
The area of an equilateral triangle is equal to half the product of the base and the height;
Possible various ways finding the area of a triangle
The area of a trapezoid is equal to the product of half the sum of its bases and its height.
To calculate the area of a pitched roof in the form of an isosceles trapezoid, it is enough to measure the upper and lower parts of the slope and its length

The total area is calculated by adding the area of all the constituent figures. Dimensions are taken taking into account the front and eaves overhangs. After this, the average number of sheets per row of roof is determined. To do this, the width of the slope must be divided by the working width of the corrugated sheet and the result rounded up. With such calculations, the overlap is 80–85 mm.

Video: example of quick calculation of any roof

Additional metal roofing elements

For installation roofing additional elements will be required, which also need to be taken into account when calculating materials. These include:

skate and ridge strip- prevent precipitation from penetrating the insulation;
valley - for drainage of water and snow into the drainage gutter;
cornice and pediment strips - cover the edges from flooding with rain;
end strips - are placed in places where the roof adjoins vertical elements: chimneys, ventilation shafts, etc.

Additional elements serve additional protection, protecting the roofing pie from moisture

To calculate the required number of additional elements, it is enough to know their linear dimensions. All additions are installed in stages and overlap by 10–15 cm. The only exception is the valley, where the overlap is 25–30 cm. Plugs are installed at the ends of the ridge on both sides, which prevent water from penetrating during slanting rains.

Video: how to measure a roof and calculate the amount of metal covering and additional elements

What is the consumption of screws per sheet of corrugated roofing sheet

There are norms for the consumption of fasteners per 1m2 of corrugated sheeting, they are expressed in pieces or kilograms. The approximate need for screws is 9–10 pcs. by one square meter roofs. So calculating the total number of screws per roof is not difficult: you need to multiply the roof area by 10. Moreover, this figure also includes the cost of installing adjacent strips, attaching aprons around pipes and snow guards.

The color of the screws is matched to the color of the corrugated sheet

This allows the fastening material to be used as efficiently as possible without compromising quality. But there are also more detailed clarifications for installation:

Experienced craftsmen prefer to purchase fasteners with a margin of 10–12%. This is due to possible defective screws and losses during installation work. In addition, it is beneficial to purchase self-tapping screws by weight.

It is known that a thousand screws with a length of 25 mm and a diameter of 4.8 mm weigh 3.5 kg. Therefore, it is easy to calculate the weight of the required number of fasteners.

Calculation of a pitched roof made of corrugated sheets

To decide on coating materials pitched roof, the following measurements are performed:

Table: correspondence of sheet grade to roof slope angle and sheathing pitch

Brand of corrugated sheet	Roof angle	Sheet thickness, mm	Lathing pitch, mm
S-8	at least 15 o	0,5	Solid
S-10	up to 15 o	0,5	Solid
S-10	more than 15 o	0,5	up to 300
S-20	up to 15 o	0,5; 0,7	Solid
S-20	more than 15 o	0,5; 0,7	up to 500
S-21	up to 15 o	0,5; 0,7	up to 300
S-21	more than 15 o	0,5; 0,7	up to 650
NS-35	up to 15 o	0,5; 0,7	up to 500
NS-35	more than 15 o	0,5; 0,7	up to 1000
N-60	at least 8 o	0,7; 0,8; 0,9	up to 3000
N-75	at least 8 o	0,7; 0,8; 0,9	up to 4000

Determine the roof area.
We calculate the number of sheets taking into account working area corrugated sheets
We calculate the required amount of fasteners.
We find the linear dimensions of the protective strips and determine required quantity linear meters, taking into account installation overlaps.

When calculating the area, frontal and eaves overhangs must be taken into account

How to calculate the amount of corrugated sheeting for a gable roof

A gable roof is two shed roofs connected under one ridge. Therefore, the calculation of materials is not particularly different.

A construction tape is used to measure the area of the slopes

Let's look at an example gable roof with a slope of 45 o. Size of one wing: 10x5 m (including cornice and front overhangs). Profiled sheet grade S-8.

The total area of the two slopes will be 2x(10x5)=100 m2. Since the working width of the C-8 sheet is 1150 mm, then for one row you will need: 10 m/1.15 = 8.7 (that is, almost 9 sheets). Number of rows: 5m/0.95m=5.3. Multiplying 8.7 by 5.3, we get: 47 sheets for each roof slope.

In practice, the consumption will be high, since it will not do without trimmings. To find out exactly how much material is needed, it is best to make a drawing to scale or use an online calculator.

Video: adjusting and laying corrugated sheets with your own hands

Program for calculating corrugated roofing

If it is not difficult to determine the amount of materials for a single- and gable roof, then when calculating four-slope (hip, half-hip), hipped and other complex roofs It is better to seek help from specialists. But you can also use special programs. This will help to avoid mistakes associated with shortages or overuse of profiled sheets and other components.

Complex hip roofs require accurate calculations the entire roof covering: flat and rounded parts

There are many such online programs on the Internet, all of them cope with the task with one error or another (for example: the “Roofing Pro” program; online calculators for detailed calculations different types roofing software "Etalon", Stroy-Calc, reference portal "Calculator" and others). Each program is maintained by an experienced engineer who, if necessary, makes the necessary adjustments. The convenience lies in the fact that the robotic assistant models the roof according to the given dimensions, taking into account and reducing many factors within the framework of accepted building codes.

Photo gallery: examples of programs and online calculators for calculations in construction

"Roofing Pro" is the simplest and most convenient to use program for calculating corrugated sheet coverings The Calculator help portal will help you quickly calculate the required amount of material for roofing Calculator for different types of roofing Software "Etalon" offers automatic calculation of roofing materials both from one measurements and from a finished drawing (with 100% accuracy) Using the Stroy-Calc calculator you can calculate necessary materials not only for the construction of the roof, but also for the construction of foundations, walls, fences and other things Professional program ArchiCAD creates images high quality with visualization mechanism The professional AutoCAD program is a three-dimensional auto-design and drawing system, available in 18 languages

By entering the roof dimensions data on the website, the customer receives:

a detailed report on the amount of material required;
a complete picture of the device and list of composition roofing pie: layers of insulation, hydro- and vapor barriers.
linear footage of additional elements, including finishing soffits (decorative panels covering the lower part of the projections and roof overhangs);
financial estimate.

Some calculators include options for selecting the thickness of the profiled sheet and color range. You can download them for your own use or carry out calculations online. Professional designers and builders use expensive and very complex programs: ArchiCAD and AutoCAD, with three-dimensional drawing and design systems, as well as a high-quality image visualization mechanism.

Video: Free online construction calculators

Calculating a roof made of corrugated sheets is not particularly difficult. However, by turning to professionals, you can get an assessment from a person with experience and specialized education, taking into account all possible options. An informed decision is worth spending a small amount of money, because in return the customer receives firm guarantees when purchasing materials and components.

Corrugated roofing is considered a very practical roofing material that is easy to install. Before you start work, you need to know how to calculate corrugated sheets correctly.

Calculation of profiled sheets

To calculate the required coverage area, you need to know that the working width of the profiled sheet is 110 cm, and the total, that is, its total width is 118 cm.

To determine the number of sheets per roof, measure the length of the slope and divide it by the width of the profiled sheet, and round the result up.

In this case, it is necessary to take into account the overlap of the roofing material. To do this from total width you need to subtract the working one, and you get 118 - 110 = 8 cm.

Then you can calculate the corrugated sheets, that is, the number and length of sheets in one row. For correct calculation, it should be remembered that the length consists of the lengths of the eaves overhang, which must be at least 50 mm, the vertical overlap, which is 150 mm, and the slope. The minimum length of the roofing covering is half a meter, its maximum length is 6 meters. Profiled sheets should be placed horizontally on the roof.

Next, you need to calculate the additional elements needed to install the roof. Their standard length is 2000 mm. First, you should measure the lengths of all slopes where additional elements will be installed. Then add them and divide the result by 1.9, taking into account the overlap of 100 mm. When making calculations for the valley, you need to divide by 1.7, leaving an overlap of at least 300 mm. The result should also be rounded up. When calculating the required number of self-tapping screws, you should remember that 7-8 pieces will be required per 1 m2.

If you are planning a roof of a non-standard configuration or with several slopes, it is necessary to draw up a drawing in accordance with the scale. Required condition is to determine the area of each element. To do this, counting the required number of sheets and all elements should be performed separately.

Return to contents

Additional calculation requirements

The corrugated sheeting on the roof is mounted on a sheathing, which is made of boards treated with an antiseptic. Therefore, the calculation of the roofing should begin with wood, which should not be less than 20 mm in thickness. The sheathing should be laid crosswise between the ridges, maintaining a distance of 20-30 cm. The amount of wood required for installation depends, firstly, on the length of the roof slope. And, secondly, from the installation step of the crossbars, which should be from 50 cm and should take into account all the loads and the slope of the roof, as well as the height of the profile and the thickness of the metal sheet.

Then it is necessary to calculate the vertical and horizontal overlaps. The vertical overlap must be calculated based on the profile, which must be made to overlap the wave, the pitch of which depends on the grade of the profiled sheet. When calculating the horizontal overlap, the slope of the roof should be taken into account. If the angle of inclination of the roof is 12-15 0, then the overlap should be made from 200 mm; at a slope of 15-30 0 - 150-200 mm; at a tilt of 30 0 - 100-150 mm. If the roof slope is less than 12 0, it is necessary to seal the vertical and horizontal overlaps using silicone sealant.

It is imperative to calculate the amount of overhangs, which depends on the height of the profile of the corrugated sheet. If the height is large, then the overhang should correspond to it so that moisture does not get inside. The amount of load on the profile that it can withstand directly depends on the height of its corrugation. The higher it is, the greater the load. For construction industrial buildings a profile with a height of more than 44 mm is suitable, and the lathing can be done in increments of 2000-3000 mm.

When installing a roof in a private house, a medium-height profile with an appropriate metal thickness is suitable. In this case, the lathing should be done in increments of 1500 mm. Then the load on the coating can be up to 500 kg per 1 m2. The smaller the profile height, the smaller the sheathing step is, or it is installed solid. Such profiled sheets are well suited for covering roofs that have a large angle of inclination.

Return to contents

Installation instructions for corrugated sheets

You will need:

material for heat and waterproofing;
construction stapler and staples;
screwdriver and screws;
silicone sealant;
profiled sheets.

After the calculation of the corrugated sheeting has been completed, you can begin its installation. First with inside At home, thermal insulation sheets and vapor barriers should be installed. Then horizontally, starting from the roof overhang, you need to lay waterproofing layer to the rafters. The gasket must be laid without tension with an overlap of 150 mm, secured between the rafters using small staples. Next, to completely fix it, you need to nail a counter rail, the width of which is 25-50 mm.

A sheathing should be installed on the waterproofing layer, over which the upper end board is then mounted to the height of the roof profile. After this, you need to attach the end strips to the installed board. Profiled sheets must be laid starting from the lower edge of the roof, overlapping. They are attached to the sheathing using galvanized self-tapping screws, at the end of which there is a drill complete with a washer and rubber gasket. Such self-tapping screws can have a diameter of 4.8-6.3 mm, a length of 19-250 mm, and they can be screwed in without pre-drilling a hole.

It is desirable that the roofing material has a length that is no less than the length of the roof slope. In this case, the coating will not have transverse joints, which improves the moisture-proof characteristics of the roof. If the purchased material is shorter than the roof structure, then its installation should be carried out horizontally from bottom row up, that is, in a row method. In this case, the installation must begin from the corner (left or right) so that the previous sheet of material is covered by the next one. Be sure to overlap the sheets on the slope by at least 15-20 cm, and the joint space is filled with silicone sealant for reliability.

According to the technology, installation of corrugated sheets for gable roof you need to start from the right end; for a hip roof, you should start from the highest point of the slope on both sides. Regardless of the complexity of the slope configuration, the profiled sheets are laid parallel to the cornice strip, which is secured with several self-tapping screws.

A profile-shaped seal must be inserted between the strip and the roofing sheet. The size of the overhang behind the cornice must be 35-40 mm. With any installation option, the main thing is to follow safety precautions and avoid damage to the coating.

Profiled galvanized steel sheets are a popular building material. It is used both for cladding walls and roofs of buildings, and for erecting fences on an industrial scale and in private construction. The light weight of corrugated sheets and ease of installation allow you to work with this durable material yourself: without the involvement of lifting equipment and complex equipment.

How to calculate the amount of material for a corrugated roofing

Corrugated sheeting is used as a roofing material exclusively for pitched roofs. On flat roofs with a slope of less than 12° its use is impractical.

Stagnation of water on a flat surface quickly leads to metal corrosion. First, rust appears around the nails, in places of cuts and junctions, and subsequently spreads over the entire area of the sheet.

When using corrugated sheets on roofs with a low angle of inclination, you have to deal with rust problems, so soft roofing is usually laid on flat roofs

When covering roofs with corrugated sheets, it is necessary to strictly follow the installation technique so that you do not have to frequently replace rusty sheets with new ones

General rules for calculating roofing sheets

Roof configuration

It is important to choose the right brand of corrugated sheet for a specific roof. The service life of the metal roof will depend on this. The material parameters are determined based on the angle of inclination of the slope (s) and the pitch of the sheathing. These include:

depth of the “wave” of corrugated board;
Metal thickness and dimensions are reflected in the markings of corrugated sheets
sheet thickness - decorative models are made thinner and with shallow corrugation;
Decorative corrugated sheets are used for wall cladding or laid on a roof with frequent sheathing and a large angle of inclination of the slopes
the presence of additional stiffening ribs.
Profiled sheets with a deep wave (for example, N-57, N-60, N-75, N-114) are made with stiffening ribs along the upper, lower or both parts of the corrugation

As the angle of inclination increases, both the roof area and the wind load on the material increase. But the snow and water melt away automatically. When installing a roof with a slope of 45° or more, it is permissible to use corrugated sheeting of a smaller thickness.

If you consider that flat roofs have to be regularly cleaned of debris and snow, and also use thick corrugated sheeting for them, which must withstand the weight of a person (and, accordingly, costs more), then the benefit of increasing the angle of the slopes becomes obvious.

Moreover, when the angle of inclination decreases, it is necessary to increase the horizontal overlap of the sheets with each other, which leads to a decrease in the useful plane.

Table: dependence of the overlap of sheets on the angle of inclination of the roof

The same principle applies to vertical overlap: the smaller the angle of the slope, the more “waves” should overlap.

The overlap can be one or two waves (depending on the angle of the roof)

Some brands of polymer-coated corrugated sheets are also produced in production to individual lengths

Grade of profiled sheet

Table: dependence of vertical overlap on the grade of corrugated sheet

Table: size of cornice overhang depending on the brand of corrugated sheet

The wide distribution of corrugated sheets is due to the variety of shapes, colors and low price

The initial letters of the corrugated sheet marking indicate the purpose of the product:

The supporting profile has a higher trapezoid or wave and additional stiffening ribs in the longitudinal plane.

Some manufacturers use the letters MP or MK for marking. For example, MP-20 means corrugated roofing sheet with a trapezoid 20 mm high. The profiled sheet marked MK-20 has similar parameters, but a different corrugation shape.

The entire set of model numbers describes the geometric shape of the metal sheet:

the first number is the height of the corrugation in millimeters;
second - metal thickness;
third - sheet width;
fourth - sheet length in millimeters.

Example: profiled sheet model S-21. 0.45. 750. 11000. Explanation of markings:

profiled wall sheet;
“wave” height 21 mm;
steel thickness 0.45 mm;
sheet size 750x11000 mm.

When selecting materials for roofing, you should understand that the division of metal sheets into universal, wall and load-bearing is very conditional. Usually, the shape of the corrugation and the thickness of the metal are taken into account, corresponding to the specific situation: the angle of inclination of the slopes and the size of the roof.

The most popular brands of corrugated sheeting in private construction are:

Some symbols indicate additional design features. For example, in the marking S-20K-1080–0.5, the letter “K” indicates a capillary groove on the edge of the sheet. With its help, additional moisture removal and ventilation are provided.

Corrugated sheeting is produced not only with trapezoidal corrugations, but also with wavy ones (in the form of slate). Externally, such a coating looks attractive, but with a similar “wave” height, the load-bearing capacity is lower.

The absence of longitudinal stiffening ribs weakens the strength of the corrugated metal sheet

How many sheets of corrugated sheets are needed for the roof?

The geometry of a pitched roof consists of rectangular, triangular and trapezoidal segments.

With all the variety of types, each roof can be externally divided into simple geometric shapes

Their area is determined by formulas well known from the school course:

The area of a rectangle is calculated by multiplying the length by the width;
The area of a rectangular roof section is calculated using the formula: length multiplied by width
The area of an equilateral triangle is equal to half the product of the base and the height;
There are various ways to find the area of a triangle
The area of a trapezoid is equal to the product of half the sum of its bases and its height.
To calculate the area of a pitched roof in the form of an isosceles trapezoid, it is enough to measure the upper and lower parts of the slope and its length

Video: example of quick calculation of any roof

Additional metal roofing elements

To install the roofing, additional elements will be required, which also need to be taken into account when calculating materials. These include:

ridge and ridge strip - prevent precipitation from penetrating the insulation;
valley - for drainage of water and snow into the drainage gutter;
cornice and pediment strips - cover the edges from flooding with rain;
end strips - are placed in places where the roof adjoins vertical elements: chimneys, ventilation shafts, etc.

Additional elements serve as additional protection, protecting the roofing pie from moisture.

Video: how to measure a roof and calculate the amount of metal covering and additional elements

What is the consumption of screws per sheet of corrugated roofing sheet

There are norms for the consumption of fasteners per 1m2 of corrugated sheeting, they are expressed in pieces or kilograms. The approximate need for screws is 9–10 pcs. per square meter of roofing. So calculating the total number of screws per roof is not difficult: you need to multiply the roof area by 10. Moreover, this figure also includes the cost of installing adjacent strips, attaching aprons around pipes and snow guards.

The color of the screws is matched to the color of the corrugated sheet

This allows the fastening material to be used as efficiently as possible without compromising quality. But there are also more detailed clarifications for installation:

It is known that a thousand screws with a length of 25 mm and a diameter of 4.8 mm weigh 3.5 kg. Therefore, it is easy to calculate the weight of the required number of fasteners.

Calculation of a pitched roof made of corrugated sheets

To determine the materials for covering a pitched roof, the following measurements are taken:

Table: correspondence of sheet grade to roof slope angle and sheathing pitch

Brand of corrugated sheet	Roof angle	Sheet thickness, mm	Lathing pitch, mm
S-8	at least 15 o	0,5	Solid
S-10	up to 15 o	0,5	Solid
S-10	more than 15 o	0,5	up to 300
S-20	up to 15 o	0,5; 0,7	Solid
S-20	more than 15 o	0,5; 0,7	up to 500
S-21	up to 15 o	0,5; 0,7	up to 300
S-21	more than 15 o	0,5; 0,7	up to 650
NS-35	up to 15 o	0,5; 0,7	up to 500
NS-35	more than 15 o	0,5; 0,7	up to 1000
N-60	at least 8 o	0,7; 0,8; 0,9	up to 3000
N-75	at least 8 o	0,7; 0,8; 0,9	up to 4000

Determine the roof area.
We calculate the number of sheets taking into account the working area of the corrugated sheet.
We calculate the required amount of fasteners.
We find the linear dimensions of the protective strips and determine the required number of linear meters, taking into account the installation overlaps.

When calculating the area, frontal and eaves overhangs must be taken into account

How to calculate the amount of corrugated sheeting for a gable roof

A gable roof is two shed roofs connected under one ridge. Therefore, the calculation of materials is not particularly different.

A construction tape is used to measure the area of the slopes

Let's consider an example of a gable roof with a slope of 45 degrees. Size of one wing: 10x5 m (including cornice and front overhangs). Profiled sheet grade S-8.

In practice, the consumption will be high, since it will not do without trimmings. To find out exactly how much material is needed, it is best to make a drawing to scale or use an online calculator.

Video: adjusting and laying corrugated sheets with your own hands

Program for calculating corrugated roofing

If it is not difficult to determine the amount of materials for a single- and gable roof, then when calculating hipped (hip, half-hipped), hipped and other complex roofs, it is better to seek help from specialists. But you can also use special programs. This will help to avoid mistakes associated with shortages or overuse of profiled sheets and other components.

Complex hip roofs require accurate calculations of the entire roof covering: flat and rounded parts

There are many such online programs on the Internet, all of them cope with the task with one degree of error or another (for example: the “Roofing Pro” program; online calculators for detailed calculations of different types of roofing; “Etalon” software, Stroy-Calc, “Calculator” reference portal and others). Each program is maintained by an experienced engineer who makes the necessary adjustments if necessary. The convenience lies in the fact that the robotic assistant models the roof according to the given dimensions, taking into account and reducing many factors within the framework of accepted building codes.

Photo gallery: examples of programs and online calculators for calculations in construction

"Roofing Pro" is the simplest and most convenient to use program for calculating corrugated sheet coverings The Calculator help portal will help you quickly calculate the required amount of material for roofing Calculator for different types of roofing Software "Etalon" offers automatic calculation of roofing materials both from one measurements and from a finished drawing (with 100% accuracy) Using the Stroy-Calc calculator, you can calculate the necessary materials not only for the construction of the roof, but also for the construction of foundations, walls, fences and other things. Professional ArchiCAD program creates high quality images with a rendering engine The professional AutoCAD program is a three-dimensional auto-design and drawing system, available in 18 languages

By entering the roof dimensions data on the website, the customer receives:

a detailed report on the amount of material required;
a complete picture of the device and a list of the composition of the roofing pie: layers of insulation, hydro- and vapor barriers.
linear footage of additional elements, including finishing soffits (decorative panels covering the lower part of the projections and roof overhangs);
financial estimate.

Some calculators include options for selecting the thickness of the corrugated sheet and the color scheme. You can download them for your own use or carry out calculations online. Professional designers and builders use expensive and very complex programs: ArchiCAD and AutoCAD, with three-dimensional drawing and design systems, as well as a high-quality image visualization mechanism.