Minimum tilt angle for metal tiles. Minimum slope of metal tiles: installation, instructions and recommendations

Metal tiles allow you to quickly and easily create a reliable roof covering. To do this you need to select quality material, know the installation technology depending on the angle of the roof. This indicator largely determines the quality of installation.

The angle of inclination of a metal tile roof and its features

The angle created by the floor plane and the roof slope is called the roof slope angle. This indicator can be expressed as a percentage or degrees, which is more relevant than a percentage. The calculation is made by dividing the height of the ridge by half the width of the building. The angle of inclination is regulated by the rules of SNiP, manufacturers of roofing coverings and depends on the operational, technical properties materials, as well as the conditions in which the constructed roof will be located.

This indicator is important for calculating the parameters of the roof and its elements. The following factors also depend on the angle of inclination:

• the possibility of using any roofing material;
• parameters, design and materials of elements rafter system;
• effective removal of sediments and prevention of their accumulation;
• cost of roof and covering installation;
• roof weight and quantity necessary materials to create it.

During the design process, all issues related to the angle of inclination, area and other indicators are resolved. Changing these data during construction will lead to disruption of the entire process, namely: increasing or decreasing the roof area, the need to change the cross-section of the rafters and other actions. For example, if the slope of a roof covered with metal tiles was changed from 22 to 45°, then the area of ​​each slope will increase by 20%. As a result of this you will need Additional materials, installation work, calculations.

Calculation of the angle of inclination

Knowing the length and height of the ridge run from the cornice is necessary for independently calculating the angle. In this case, the laying represents the distance of the lower horizontal zone of the slope from the corner area to the projection of the upper point of the roof on the eaves. The slope is indicated by the symbol i and is calculated in percentage or degrees using the formula i = H/L. In this case, H is the height of the roof, and L is the length of the roof. To convert the result into a percentage, you need to multiply it by 100. At the end of the calculations, select the appropriate material that can be used with the existing slope of the slopes.

The pitch angle of the roof depends on the ratio of the height of the ridge and the width of the span

Video: features of finding the roof corner

Minimum inclination angle

For high-quality installation and maximum use of the properties of metal tiles, it is necessary to take into account the fact that there is a minimum angle of inclination that allows the use of this material. The smallest acceptable parameter is 12°, and if the angle is smaller, then metal tiles are not suitable for roofing. This is true for both hip and half-hip structures.

High-quality metal roofing is possible if you take into account important indicators designs

Minimum angle Tilt is often used in regions with strong winds but little snow load. This is due to the fact that a slope of 12° does not make the roof a special obstacle to the wind and gusts pass freely over the structure. If the region is characterized by heavy precipitation in the form of snow, then a steeper roof for the building is necessary.

Established standards SNiP and GOST regulate the design of many structures and structures. This also applies to roofs covered with metal tiles, namely, there is a recommended value for the angle of inclination of the slopes. Acceptable average angle for pitched roofs ranges from 20 to 30°, which makes the metal tile coating as functional and practical as possible. Gable structures can be constructed at an angle of 20–45°.

Depending on the angle of inclination, the type of roof is determined

The recommended parameter can be specified by the manufacturer of the roofing material. Often this indicator is used when using metal tiles, but this approach is quite objective and non-individual. Following the manufacturer's recommendations will allow you to get the maximum benefit from the characteristics of metal tiles, for example, improve rainfall or prevent sheet breakage, but important role The climate of the region plays a role.

Video: how to measure the angle of the slope

Determining the optimal angle

Roofs can be different in shape and size, so their parameters are always calculated individually. Determining the angle of inclination depending on the type of roof covering allows you to independently find out its value and create reliable design, which is resistant to wind and snow loads.

Broken and complex roofs require professional calculation of the slope angle

If the roof has a broken shape or many slopes with fractures, then the calculation of the parameters should be carried out professionally. Often all slopes do not differ from each other by more than 20°. This takes into account existing standards and standards, required design dimensions, climatic factors and other features.

The optimal angle for a roof covered with metal tiles is 22°. This indicator was identified by professional craftsmen as a result of many years of experience working with similar structures and studying the properties of metal tiles.

Slope of a hipped roof made of metal tiles

A roof with 4 inclined surfaces is called hip or hip. Each slope must have a certain angle of inclination, but the design has symmetrical sides. The end parts are sometimes shortened, in which case the roof will be called half-hip. To calculate it, the same rules are used as for a full-fledged hipped roof.

A hip roof is easy to construct, but requires careful calculation of parameters

An accurate calculation of the angle can be carried out by a professional, and if it is not possible to get such help, then it is worth considering optimal parameters depending on climatic conditions:

• a minimum value of 12° is used for strong wind loads but light precipitation;
• if there are events in the region snowy winters, then you can choose an angle of 55–75°;
• for climates combining strong winds and heavy precipitation, an average tilt angle of 30–50° is convenient.

This approach is easy to implement if you know the weather conditions in your region of residence. Relevant data can be found in available information sources and websites of meteorological centers.

The angle of inclination is determined separately for triangular and trapezoidal slopes

Gable roof and its slope for metal tiles

When determining the level of slopes for a roof with two inclined surfaces, the same principles apply as in the basic calculation of a hip structure. These are climatic factors and the material of the external coating.

Simple gable roof has symmetrical sides

The optimal indicator for a gable structure is an angle of 20–45°. This slope does not make the roof an obstacle to the wind and ensures rapid drainage of snow and water. If you need to create a spacious attic, then this value is increased. In this case, the amount of roofing material increases.

When installing low-slope roofs made of metal tiles, experts recommend the following actions:

• increasing the frequency of sheathing slats and reducing the pitch between the main rafters, which allows minimizing the risk of collapse or damage to the roof under snow load;
• when installing metal tile sheets, horizontal overlaps are 8 cm, and vertical overlaps are 15 cm;
• thorough insulation of joints silicone sealants, intended for roofing work.

If the roof consists of slopes various forms, then for each of them the angle is calculated individually

An angle of 45° is optimal for rapid removal of water and snow cover. There is another feature here - heavy weight roofing covering, due to which it can become deformed or slide off the slope. The only solution in this case will be additional fixation of each covering element to a durable sheathing.

Asymmetrical metal roofing

Original and simple solution for construction beautiful home is an asymmetrical roof with slopes of different lengths. They represent two surfaces with different angles of inclination. Therefore, it is especially important to select for each side a parameter that will ensure the design’s reliability, practicality in operation and resistance to climatic conditions.

The indicator of each slope is determined individually

When calculating such a roof, it should be taken into account that the surface with a large slope should be located on the side of the prevailing winds. This will ensure rapid precipitation, but the slope should not be too steep, as in such a case it will become an obstacle to the wind and can be damaged by strong gusts. In this case, the angles of the surfaces should not differ by more than 25–30°.

Asymmetrical roofing allows you to create a canopy for the veranda

In the process of constructing an asymmetrical roof, it is important to take into account that the center of gravity is not in the middle of the building, as is the case with a gable or other classic roof. Therefore, a reinforced rafter system is created, and the angle of the roof should not be more than 45°. If the slope is greater than this indicator, then the windage of the structure increases, which leads to its damage.

Determining the angle of the roof slope is an important process on which the effectiveness of metal tiles as a roofing depends. Accounting climatic factors, building parameters, required useful volume of the attic will allow you to find out optimal location stingrays and make them as easy to use as possible.

In the process of constructing residential cottages and buildings for other purposes, metal tiles are often used to cover the roof. This material is quite beautiful, modern, durable and reliable. But so that metal tiles can fully demonstrate their positive traits, it is necessary to take into account many different parameters. One of these parameters is the minimum slope of a metal roof. Let's look at what it is.

There are no little things in the design and construction of a roof that could be called insignificant or insignificant. Thus, a correctly selected minimum angle of inclination of a metal tile roof not only affects the aesthetic perception of the roof, but also has quite practical significance.

The fact is that the performance of the coating, namely its protective properties, depends on the height of the slope. In addition, the location of the slopes will depend general design roofs, as well as such a parameter as material consumption.

What is slope slope?

First you need to understand what the slope of a metal tile roof is and how it is determined. So, the slope of the slopes is the angle that is formed between the rafters and the floor plane. The formula for calculating the slope is as follows:

In this formula, the symbol I denotes the slope of the slopes, the symbol H denotes the height measured from the ceiling to the highest part of the ridge, and the symbol L denotes the width of the roof.

Advice! In calculations performed for broken roofs, it is necessary to calculate the slope for each section separately. In this case, the formula takes into account not the total width of the building, but the width of the part that is covered by a given section of the roofing.

For example, you need to calculate the slope of a roof with a width of 8 meters and a ridge height of 3 meters. According to our formula, it turns out - 3: 0.5 X 8 = 0.75. If the angle of inclination is expressed as a percentage, then the resulting calculation result must be multiplied by 100%. For our example, the slope of the slope will be 75%.

However, the slope slope is expressed not only as a percentage, but also in degrees, and both measurement systems are used equally often. When expressing the slope in degrees, the actual angle that the rafters form in relation to the floor surface is measured.

Advice! Usage different systems calculations can lead to considerable confusion, so you should always pay attention to whether this value is expressed in degrees or as a percentage. To convert one value to another, you can use geometric formulas, but it is possible to do it easier by turning to ready-made tables for converting values ​​given in reference books. So, if the percentage slope of the slope in our example is 75%, then when measured in degrees this value will be 37 degrees.

What factors influence the choice of ramp slope?

Of course, the angle of inclination of a metal roof has a significant impact on appearance buildings, however, this value is chosen not only for aesthetic reasons. When designing, be sure to take into account:

• Wind load in this region. You need to understand that the greater the angle of inclination of the slope, the greater the windage of the roof. Therefore, in the design process, it is necessary to take into account the wind strength characteristic of a given region, taking into account possible wind disasters in the given area in the form of hurricanes, tornadoes, etc. As a rule, necessary information on wind load can be found in special reference books.

• Snow load, that is, the weight of the snow “cap” that can cover the roof. It is clear that flatter roofs accumulate a thicker layer of snow than roofs with steep slopes. If the slope angle of a metal tile roof is chosen incorrectly, the coating may be deformed under the pressure of the snow mass.

Advice! Naturally, the amount of snow falling in winter time, is not a constant value and changes from year to year. Therefore, for calculations, average statistical data obtained as a result of many years of information collection are used. Data on snow loads can be found in reference books.

• When choosing the slope of a metal roof, it is necessary to take into account whether the roof of the house is insulated or not. Thus, more snow accumulates on well-insulated roofs than on those through which significant heat loss passes.

Advice! When planning to insulate an already in use roof, it is worth finding out whether its slopes have a sufficient slope. The fact is that when installing a heat-insulating layer, the amount of snow accumulating on the coating can increase significantly. And if the roof slope is insufficient, then after insulation the metal tile covering may deform under snow load.

• The choice of slope slope depends not only on the amount of winter precipitation, but also on the amount of rain. Thus, in areas where traditionally there is a lot of rainfall in summer period, it is recommended to make roofs with slopes of at least 22 degrees.

What is the minimum angle for roof slopes covered with metal tiles?

When choosing a roof structure, one cannot help but take into account what kind of material is planned to be used for roofing. The fact is that for most materials there are restrictions on this parameter.

Thus, metal tiles should not be used to cover flat roofs. For such structures, other types of roofing coverings should be chosen. The minimum possible slope of slopes on which metal tiles can be laid is 14 degrees.

However, in practice, such a small slope for metal tile roofs is rarely used. Since so flat roofs do not tolerate rain and snow loads well. But, it should be noted that roofs with minimal slopes are good in areas characterized by strong winds and a large number of sunny days, since roofs with a minimum slope heat up less and have minimal windage.

How to find the golden mean?

Thus, during the design process it is necessary to select optimal angle tilting the roof made of metal tiles so that the roof can withstand both precipitation and wind loads, and in sunny days didn't get too hot.

When solving this problem, one cannot ignore the fact that the greater the slope angle, the greater the consumption of materials, since the roof area increases. Moreover, the consumption of not only metal tiles increases, but also the consumption of materials for the manufacture of rafters, sheathing and other materials.

Therefore, choosing a slope angle is always a compromise solution, a search for the “golden mean” between the strength of the coating, its cost and the desire to implement certain architectural solutions in the roof structure.

So, the snip does not strictly regulate the slope of a metal tile roof. The standards fix the value of only the minimum slope, but the choice of the optimal value of this parameter falls on the shoulders of the designer. In the process of drawing up a project, it is necessary to take into account the climatic characteristics of the region, calculate the material consumption and take into account the wishes of the owners regarding the architectural appearance of the future house.

Our huge country is located in different climatic zones. If in the Far North and Far East strong wind and snow, then in the south of Russia there may be rain and wind. You need a very responsible approach to choosing roofing material and calculating the slope of the roof of your house. The most practical choice is metal tiles because they are inexpensive, durable and beautiful. But the angle of the roof depends on the expected wind load and, typical for your region, atmospheric precipitation. So what should be the minimum pitch angles for your metal roof? This question needs to be answered.

In this article

Properties of roofing material

IN modern construction A wide variety of roofing coverings are used, but metal tiles are deservedly considered one of the most popular materials. In many countries, materials such as tiles have long been produced. Therefore, the use of metal not only reduces the final cost of the product, but also serves as a harmonious continuation of ancient traditions. The high technical characteristics of metal tiles include:

• the use of galvanized sheet metal and its coating with durable polymer paints to impart anti-corrosion properties;
• wide choice of color architectural solutions;
• manufacturability and ease of installation of the roof, which does not require any special tools and devices;
• the lightness of the material, allowing it to be installed at high altitudes and in complex rafter structures;
• no heavy load on the rafters due to the low weight of the sheet;
• with a relatively thin sheet, it can withstand quite large loads, since it has stiffening ribs.

All of the listed properties allow the use of this coating in difficult climatic conditions. To calculate the amount of material, you need to know the minimum angle of inclination of a metal roof.

How to determine the roof pitch in your area

To calculate strength roofing structure and quantities required material you need to know the optimal roof slope.

1. It is necessary to take into account a number of circumstances, including:
2. projected number of slopes;
3. used under-roof space;
4. Efficiency indicators;

weight of the structure.

A slight slope, about 10-12 degrees, has its drawbacks, which require increasing the row of sheathing and strengthening the rafters, due to the increased snow load. In addition, care should be taken to improve waterproofing and the need to increase the overlap of sheets. This is done to prevent leaks at joints with gentle slopes. Roofs of this design are best suited for southern regions, where the snow cover is not heavy and the average annual temperature is not too low. In the summer, low-slope roofs warm up less, which creates a comfortable conditions for existence.

Steep slopes, ranging from 30 to 45 degrees, are more suitable for regions with more low temperatures and frequent snowfalls, but it is necessary to take into account the increasing wind load on the roof and the building as a whole. It is also important to take into account the strength characteristics of metal tiles, which are laid down by the manufacturer of the material. In the case of steep slopes, it is necessary to fasten the sheets more often than usual, because they are prone to sliding under the influence of gravity. The greater the angle of inclination of the roof, the more labor-intensive and less economical it will be to install.

There are two loads on the roofing material, which, in terms of technical strength, oppose each other.

The steeper the roof slopes are constructed, the greater the angle of inclination, the easier it is for precipitation to mix on them without lingering on the surfaces of the slopes. But at the same time, the roof area increases, threatening an increase in wind loads. Therefore, it is worth choosing based on two parameters best option, taking into account the factor of increasing the cost of the structure due to increasing the size of the roof structure.

What is the optimal angle of roof inclination recommended by the manufacturers of this building material? After the tests, companies producing metal tiles recommend using it when the slope is inclined from 11 to 45 degrees. In this case, the most acceptable angle of inclination is from 12 to 22 degrees. Building codes and the rules do not give clearly defined recommendations on this matter, but the preferred one, with a slope length of about 6 meters, is an inclination angle of 14 degrees. We have come to the choice of the most economical method of covering the roof, which is determined by such a concept as the minimum slope of a metal roof.

What is the minimum slope and how to determine it

Depending on the climate zone, architectural design and aesthetic preferences of the home owners, the following types of roofs are erected:

• multi-gable roof with a complex and slender structure;
• vaulted roof as element national culture in architecture;
• hip roof, complex hipped structure;
• hip roof, combination of isosceles triangles;
• gable roof, widespread and time-tested;
• the roof is pitched, used mainly for technical and utility rooms or as an element of a more complex structure.

Multi-gable and vaulted roofs are not suitable for the use of metal tiles, which are used only in the elements of these structures. Whereas hip roofs are quite widely used in middle lane and are characterized by a choice of minimum tilt angles ranging from 22 to 45 degrees. Hip roof used as decorative element, and the angle of inclination of isosceles triangles is directly dependent on the area covered by the tent. This structural element is very economical to manufacture, and the angle of inclination ranges from 35 to 45 degrees.

One of the most popular roofs is gable. The manufacturer recommends maintaining minimum roof slope angles ranging from 12 to 14 degrees. Given the harsh climate, it can be recommended to expand these limits from 14 to 22 degrees of slope. It is with these characteristics that the roof withstands possible strong winds, and also represents practically monolithic structure, preventing the penetration of moisture into the under-roof space of the building.

For pitched roofs, the minimum slope angles range from 11 to 14 degrees, since large angles slopes create a danger of the roof falling off due to multidirectional gusts of wind. In the climatic conditions of Russia, you need to adhere to the minimum slope of the slopes from 14 to 22 degrees. When building in flat or mountainous areas, it is necessary to take into account the landscape and wind rose, depending on the time of year.

Each person’s taste preferences play a role in choosing the type of roof. decisive role. Everyone wants to build a house so that it is beautiful, comfortable and serves long years. The roof crowns the building and it Special attention because it not only decorates, but also protects from exposure aggressive environment. In order for it to serve for many years, you need to design it correctly and build it correctly. And to save money, you need to choose the correct slope of this roof for metal tiles, taking into account the climatic conditions of your region.

The durability and quality of the roof directly depends on correct selection coating material. Not least important selection criteria are appearance and compliance with environmental standards. Among experts, the opinion has long been strengthened that they fully meet these requirements.

From three types metal roofing material, the profiled sheet covering stands out imitative natural tiles- metal tiles.

Its base is coiled steel coated with an aluminum-zinc composition for resistance harmful effects environment. For increased stability finishing layer for metal additionally applied polymer coating . In this article you will learn how to calculate the roof angle for metal tiles and what factors affect the roof covering.

Affordable price and increased performance characteristics allow metal tiles to occupy a leading position in the roofing materials sales market.

The positive aspects of its use are:

• a light weight - about 5 kg/m2, as a result, there is no need to build a complex one;
• does not require special installation skills;
• wear resistance;
• long service life;
• elegant and festive look, suitable for any design development.

Among the shortcomings, users and experts most often note:

• increased noisiness during rain or hail;
• need for use due to avalanche-like snowfall;
• a large number of fastening elements those under direct influence of precipitation;
• A grounding device is required to protect against static electricity buildup.

NOTE!

Please note that there is a type of metal tile with additional protective layer as a crumb topping natural stone . Unlike classic spraying, this composite coating gives a solid appearance and protects the house well from noise penetration.

Roofing sheet composition

Qualitative indicators metal tile roofs in many ways depends on:

• the required minimum steel sheet thickness – not less than 0.4 mm. With a small slope, a coating with a thickness of less than 0.4 mm may not withstand snow load. Increasing the slope, to reduce this impact factor, increases the possibility of increased wind load, which also negatively affects metal thinner than the specified value;
• emerging corrosion from possible damage during transportation or unprofessional work using a grinder when cutting sheets. Important in cases where it is impossible to do without using a grinder, treat the cutting area with a protective compound ;
• mandatory presence of an anti-condensation screen made of . Need to know that superdiffusion cannot be used as such an anti-condensation material protective membrane, since its use implies more frequent and prolonged exposure to moisture on inner surface leaf.

What factors affect the roof?

Basic factors negatively affecting condition and durability metal tiles are divided into three types:

Short-term

• the weight of people and building materials during the construction and maintenance of the roof;
• standard snow loads;
• temperature climatic influences;
• wind loads.

Long-term

• snow loads below the established norm;
• impact due to deformation of the supporting base.

Special

• seismic impacts;

All components in the construction of the rafter system are guaranteed to ensure the resistance of the metal tile covering to the maximum permissible overloads.

Sheets of profiled metal have sufficient rigidity, so they are not required. But when installing a rafter system, it is necessary to correctly calculate the pitch and angle of inclination of the rafter leg.

Roof angle for metal tiles

Minimum angle metal roof slope is 10 degrees.

Allowable slope metal tile roof can be values ranging from 10 o to 90 o.

When choosing the optimal slope, you need to take into account that if the slope is too small, it will be difficult to use the attic space.

In the case of a large building height, it may be difficult to access the roof to carry out technical activities. An increase in the angle of inclination results in an increase in surface area, which will negatively affect the final cost of materials and work performed.

Correct calculation tilt angle parameters impossible without taking into account such components:

• which model of corrugated metal tile surface will be chosen for use. The characteristics of some manufacturers initially include data on the minimum permissible slope;
• what kind of design is meant - single-slope or double-slope;
• possibility of snow removal after .

Taking these conditions into account, without having additional input in the form of a special climatic zone, we can take as a basis the optimal slope with a slope length of about 6 m. is 22 degrees.

This figure is not in technical documents on the construction of roofs, it was obtained experimentally as a result of observations of the metal tile surface in use.

How to choose a roof angle for metal tiles?

How to correctly calculate the optimal slope?

To accurately calculate the angle of inclination it is necessary know two sizes:

• height truss structure , in other words, the vertical distance from the top of the parapet on which the rafter leg rests, ;
• the width of the house itself.

For a pitched roof, the slope will be the value obtained by dividing the height of the structure by the width of the house. In the case of calculating a gable roof, the height is taken and divided by half the width of the house. Since it is customary to express slopes as a percentage, the resulting figure is multiplied by 100.

To obtain a more accurate result, use not the floor slab as a reference point for the distance to the ridge, as many people mistakenly believe, namely parapet top, as bases for supporting rafters.

In practice, there are options for installing roofs; the minimum slope for metal tiles is less than 10 degrees. Such exceptions apply special recommendations on construction.

The pitch of metal tiles depending on the angle of inclination of the roof

In view of the increased snow load, a reinforced design of the rafter system with a device is made continuous sheathing. If all standards are observed, a waterproofing carpet is laid on it. When laying sheets under transverse and longitudinal joints, special gaskets are installed.

Useful video

We invite you to watch a video tutorial on self-measurement roof corner:

Metal tiles are considered one of the most convenient and popular roofing materials. Distinguished by its high load-bearing capacity, durability, and ease of installation, metal tiles are little susceptible to mechanical stress. When planning the laying out of the material, you should calculate the correct slope for the metal tiles and observe the technological details of installation. Then the roof will serve for a long time and will not require immediate renovation.

The slope of the roof is an important determining factor of the structure, formed by the angle cut off by the floor plane and roof slope. The indicator is expressed as a percentage or degrees, calculated by dividing the height of the ridge by 1/2 the width of the building. The angle of inclination of a metal tile roof is regulated by SNiP and the supplier’s instructions. The indicator depends on factors such as:

1. Application of roof covering on the roof.
2. The ability of a roof to effectively remove natural precipitation, resist winds and other climatic phenomena.
3. Roofing price.
4. The mass of the roofing cake.

A fairly new coating, metal tiles, is not so strictly regulated by standards. Therefore, the manufacturer himself often advises the minimum angle indicator, based on specifications products. The calculation is made based on the thickness of the sheet, bearing capacity basics and method of laying roofing. However, there are optimal values that you should rely on:

• With a slope of 6 meters in length, the minimum slope according to SNiP must be at least 14°.
• The permissible slope of a metal tile roof should be in the range of 14-45°.
• The optimal angle is 22°, this indicator is sufficient for normal sediment removal with a slope area of ​​less than 6 meters.

Choosing a roof slope is not always simple, therefore, based on SNiP indicators, you should take into account the following recommendations for the slope slope being arranged:

1. Level of snow load in the construction region. To determine the indicator, you need to take information from the directory and calculate the average annual amount in winter period. The thicker the snow cover, the greater the level of slope, otherwise the snow mass will linger on the roof, which will lead to deformation of the sheets.
2. Wind load - this indicator also depends on the characteristics of the region. At maximum intensity of wind flows, the angle of inclination is small, which reduces the windage of the slopes.

Advice! The number of hurricanes, tornadoes and other natural disasters. Information is taken from reference books.

Features of low-slope metal tile roofs

The lowest slope angle is 14°, but experienced roofers lay materials when calculating an angle of 10-14°. And to ensure the reliability of the roofing carpet and reduce the risk of leaks, the following actions are performed:

• The frequency of slats in the sheathing increases due to the reduction in the inter-rafter pitch.
• The rafter system is strengthened by frequent or continuous lathing.
• Significantly increase the number of overlaps! Despite manufacturers' recommendations for a horizontal overlap of 8 cm and a vertical overlap of 10-15 cm, the overlap increases by the width of the wave. Thanks to this method, the strength of the roofing carpet is increased and the risk of leaks on the roof of a small slope is eliminated.
• Carefully seal the joints with silicone-based sealant.

Advice! All measures taken are temporary, so a visual inspection of the roof once a year will not hurt.

Determining the roof slope by geometric dimensions or in degrees

Formula for calculating the slope steepness for a metal tile roof by size, for example, for gable roof calculated using the following formula: I = H/(1/2L), where:

• I - the required angle for metal tiles;
• H is the distance from the ceiling boundary to the ridge, that is, an indicator of the height of the truss structure;
• L – dimensions of the width of the building.

To find the percentage, the resulting indicator i is multiplied by 100. And to express it in degrees, you should use trigonometric function or find the value in the corresponding table:

Important! This type calculation is suitable for one-, gable roofs. For a single-pitched structure, the entire length of the span is taken into account. In the case of arranging a roofing carpet with an asymmetrical slope, the roof angle is calculated by the distance from the projection point of the ridge element to the ceiling for each slope separately.

The optimal angle for a roof with complex structural elements a correction factor for projection in the horizontal direction is taken into account:

• Roof angle 1: 12 (7°) – K = 1.014;
• 1:10 (8°) = 1.020;
• 1:8 (10°) = 1.031;
• 1:6 (13°) = 1.054;
• 1:5 (15°) = 1.077;
• 1:4 (18°) = 1.118;
• 1:3 (22°) = 1.202;
• 1:2 (30°) = 1.410.

Criteria for choosing the angle of inclination

When calculating the roof angle for metal tiles, you need to know that a low slope has its advantages:

1. economical consumption of materials;
2. reduction in the weight of the roofing carpet, the indicator of the windage of the sheets, which minimizes the risk of defects in heavy winds;
3. convenience and simplicity of arrangement of drainage systems.

But there are also disadvantages, if the roof slope is minimal, then:

1. it is necessary to seal the joints as much as possible, since the almost complete absence of drainage increases the possibility of moisture penetration through the fastening points;
2. you will have to remove snow debris from the roof more often so that the metal tiles are not subject to increased load;
3. the need to install a powerful sheathing will require calculation of the load-bearing capacity of the base and will complicate the fastening of roofing elements;
4. under flat roof It is not always possible to arrange spacious residential/non-residential premises.

But if the roof slope is large, for example 45°, then, despite the free descent of the snow cover, the mass of the covering is increased, which is why the sheets simply slide. The solution is to strengthen the fasteners and strictly adhere to the technology for installing the roofing carpet. In addition, when the angle of inclination of a metal tile roof is too steep, the consumption of roofing material increases, as when arranging shaped slopes.

In order not to calculate which angle will be better, take as a basis the recommendations of experienced roofers: for single-pitched roofs it is 20-30°, for gable roofs – 25-45°. AND little advice: when arranging the sheathing with frequent steps, a kind of shock-absorbing cushion is obtained that strengthens the roofing carpet. Knowing the calculation formula, it’s easy to calculate different variants steepness of the slopes and decide which angle to give preference, depending on the weather, climatic conditions and the financial component: whatever one may say, roofs with a minimal slope require less material.