The minimum angle of inclination of the roof for metal tiles. We select the angle of inclination for a roof made of metal

Today, in private housing construction, a roof made of metal tiles is popular. In order for it to serve for a long time and successfully withstand various loads during operation, the size of the slope of the roof made of metal tiles must have optimal values.

Characteristics of metal tiles

This roofing material has the following features:

Insignificant weight within 5-7 kilograms per "square". With the help of metal tiles, it is possible to equip roofs that are distinguished by complex forms of construction. There is no need to further strengthen truss system in case of replacement of the coating material. Such tiles do not exert a significant load on the foundation of the building and load-bearing structures.
Ease of installation allows home craftsmen to lay roofing on their own, because this does not require the use of special equipment.
Thanks to the widest selection color design metal tiles, it is possible to choose a shade of material that will not violate the integrity general view Houses.
The coating, made of steel sheets with a thickness of 0.4 to 0.7 millimeters, has the ability to withstand severe loads due to the presence of a profile.
The metal tile is qualitatively protected from corrosion processes due to galvanization and an additional polymer layer applied on top of the sheet.
This modern roof covering combines durability, affordable cost and aesthetics.

Features of the choice of material

When choosing products and when drafting a roof structure, it is necessary to take into account some nuances, including the minimum allowable angle of the roof slope from a metal tile.

This indicator depends on:

choice of roofing;
structural device of the truss system;
the ability to withstand the weight of snow, depending on the climatic features of the region;
the ability to quickly and completely remove precipitation from the surface of the roofing.

The small value of the minimum slope of the metal roofing is due to the rigidity inherent in profiled steel sheets and the slight surface roughness that has a protective polymer layer. Such a coating can easily withstand the effects of precipitation.

Factors affecting the determination of the slope angle

There is no unified size for the angle of inclination of a metal roof.

The value of the minimum slope is influenced by a number of factors that should be considered when drawing up a project, namely:

The amount of rainfall. The best solution is to install the slopes at a slope of at least 22 degrees. If the roof angle for a metal tile is made smaller, then sealant cannot be dispensed with, since it is necessary to prevent moisture from entering inside roofing cake at the junction of sheets of material.
roof shape. The recommended slope for a single-slope version is 20 - 30 degrees, and for a dual-slope 20-45 degrees.
Wind loads. To calculate this indicator, you will need to know the surface area of \u200b\u200bthe roof, and in addition, the wind strength characteristic of a particular region. We should not forget about the possibility of natural disasters. Information about this can be found in reference books.
Snow loads. In winter, snowdrifts often accumulate on the roofs of houses, which, under the force of their weight, slide down. Roofs with a slight slope should be cleaned regularly to prevent damage. roof structure under heavy snow loads. The steeper the slope of the roof from the metal tile, the faster the layers of snow slide off it. To find out the average annual rainfall, use reference books.

Specialists, working on a roof project, lay down a certain strength margin so that during operation there is no deformation of the tile if the amount of accumulated snow is much higher than the average.

The choice of the minimum angle of inclination of a metal roof during design is influenced by the presence of a heating pipeline, thermal insulation near the building and a roofing carpet. In cases where the roof structure is not sufficiently insulated, large losses of thermal energy occur through it. As a result, the snow lying on it melts, and the moisture under it either freezes or flows down.

When the slope of the roof for a metal tile has been determined before thermal insulation, the likelihood that the coating will not withstand significant snow loads increases significantly.

Minimum roof pitch

Based on the standards prescribed in SNiP, the length of the slope should be 6 meters, and the minimum roof slope for metal tiles should be 14 degrees. These values were calculated by specialists taking into account the strength of the material of manufacture and its resistance to various loads.

When designing roofing systems, the recommendations of the company that produces this roofing product are certainly taken into account. Most often, manufacturers indicate that the minimum slope for metal tiles is 12 degrees.

Some enterprises have launched the production of material that can be mounted on roofs with an 11-degree slope. Changing this parameter in the direction of reduction became possible due to the improvement in the characteristics of some tile models. Such products are distinguished by a high degree of material rigidity and have a smoother sliding surface.

The dependence of the roof slope on the weather conditions in the region

By the way, a tile roof with a minimum angle of inclination can be used in those climatic conditions where a small amount of precipitation falls during the year. In this case, a small slope allows the roof to effectively withstand wind gusts, but at the same time snow loads increase, since the mass of snow does not sink down.

A roof with a minimum slope will be the best solution for areas where many sunny hot days are recorded throughout the year. Since such a roof has a smaller area, which means that it does not warm up so much, this circumstance contributes to a comfortable microclimate in the premises of the house.

The minimum angle of inclination for metal tiles allows you to save on the purchase of materials for the construction of the roof structure and the arrangement of the roofing carpet, since they are needed less than when building a roof that has a steeper shape.

A roof with slopes having a minimum angle for metal tiles will be practical and inexpensive option construction for regions with a hot climate, in which the average annual amount of precipitation is low.

If you do not adhere to the slope recommended by the manufacturer, then the roofing will not be able to provide the building reliable protection from moisture penetration, and in regions with heavy snowfall, there is a risk that such a metal roof can collapse at any time.

The optimal size of the slope of the roof with metal tiles

The roof coverage area will be the greater, the greater the slope angle. At the same time, the roof, which has steep slopes, is not able to hold precipitation on its surface, and they quickly and almost completely roll down to the ground.

True, high roofs have an increased windage and, when arranging them, it is necessary to purchase large quantity building materials for the construction of a system of rafters and roofing. Thus, the steeper and higher the roof, the more expensive and more difficult the construction will be.

Due to the windage, it is not recommended to build high roofs with a metal tile coating with a significant angle of inclination in climatic zones where strong winds are noted - this parameter affects the possibility roof structure resist loads.

To increase the strength of a roof with a slight slope, it is customary to make more frequent lathing, which will simultaneously strengthen the rafter system and give it additional reliability.

For gabled roofs, metal tiles are not entirely suitable. If the slope angle is greater than 45 degrees, then the sheets of material may slide down. To prevent this from happening, it is necessary to provide for additional fixing them to the crate.

Manufacturers of this roofing material, taking into account many years of roofing practice, have determined that optimal size roof angle for metal tiles is 22 degrees. Thanks to this design, moisture quickly leaves the roof without lingering on it.

The roof, which was erected with an angle of inclination of 22 degrees, is durable and copes well with serious wind loads. The arrangement of such a roof is relatively inexpensive.

The calculation of the optimal slope can be called the search for a compromise result, taking into account the strength of the roof structure. It should also be remembered that the tiled roof must match the architectural appearance of the building.

Among all modern roofing materials, metal tiles are considered the leader in consumer sympathy. Why did this particular roof become so widely used? To answer this question, you need to compare the technical and operational characteristics of metal tiles and other roofing materials.

The minimum angle of inclination of the roof from a metal tile

Parameter	Brief comparative characteristic
	The weight of metal sheets ranges from 5–7 kg/m2, the spread is associated with different thicknesses. The corrugated board has the same mass, the differences between both roofs are only in the geometry of the profile. Only weigh less roll coatings but they have limited uses. All other roofing materials weigh much more. Eg, square meter ordinary slate can weigh more than 30 kg. The mass of the coating is an important technical parameter, the truss system depends on it, sometimes the weight of the roof must be taken into account when calculating the foundation of the structure.
Manufacturability of installation	For the manufacture of metal tiles, thin-sheet steel up to 0.6 mm thick is used. Such sheets can be cut without problems not only with electric, but also with manual special tools. The disadvantage is a significant amount of waste metal tiles during the coating of complex pitched roofs.
Operating time	If the material is made by responsible manufacturers, the thickness and quality of the zinc layer is precisely maintained, and innovative polymer coatings are used to finish the outer layers, then the service life can exceed fifty years. But the problem is that consumers do not have the opportunity to independently and objectively control the quality of galvanizing and the parameters of polymer paints, they have to trust the advertising of manufacturers or distributors. And among them there are quite a few unscrupulous. In terms of service life, metal tiles are second only to piece natural tiles, but only in the case of high-quality and expensive types of coatings.
Design qualities	Despite the efforts of technologists to bring as close as possible appearance metal and natural tiles, the similarity between them, except for the name, is very arbitrary. Color palette very wide, from natural to blue and other very original colors. This, on the one hand, increases the design possibilities of architects, and on the other hand, makes even more noticeable and so big difference in the appearance of metal and natural tiles. The presence of the word "tile" in the name of the product is successful marketing ploy to increase sales. Consumers react positively to such advertising - everyone has real respect for tiles.
Price	For comparison, you need to take the average cost of all price categories, and the spread is quite large. At an average cost, a metal tile is cheaper than only piece coatings, while other roofing materials have a lower price. In fact, one should take into account not only the cost of materials, but also the financial costs of their installation. With such a comprehensive comparison, the metal tile is second only to the metal profile.

If a decision is made to use metal tiles for covering the roof, then the manufacturer's recommendations should be strictly followed to ensure tightness. They regulate several parameters of the rafter system and slopes, including the minimum angle of inclination.

Why is the angle of inclination of the metal tile important?

This indicator is important not only for metal tiles, but also for all other types of roofing. What parameters depend on the angle of inclination of a metal roof?

Rafter Load Calculator

How is the slope of a metal tile roof determined?

Previously, the slope was determined only in degrees, this value was clear to all builders and they could imagine the appearance of the roof without a drawing. IN Lately another definition of the magnitude of the slope was introduced into the building codes - as a percentage, there was more confusion, what little people know about the changes. If roofers easily understand how the roof slopes are at an angle of 30 °, then few of them can draw a rough sketch of a roof with a slope of 57.7%. Although these are the same 30 °.

Slope calculation algorithm

Slope - the ratio of the height of the roof in the ridge zone to half the width of the building, calculated by the formula

I% = H×0.5L×100, where

I - the slope of the roof slope in percent. The smaller the percentage, the smaller the slope, a 1° angle equals a 1.8% slope, and a 45° angle equals a 100% slope.
H - The height of the truss system. The height of the ridge or ridge run is measured.
L is the width of the truss system. When calculating, half the width is taken to determine the difference in size between the two legs of the triangle.

For example, if the height of the ridge is 1 m, and the width of the building is 10 m, then for gable roof the slope is 1:0.5×10×100=20%.

This formula is used for gable roofs systems. In our case, it needs to be adjusted. The fact is that there are no gable roofs with a minimum angle of inclination, these are options for only single-pitched truss systems. This means that it is not necessary to divide the width of the building by two, the formula changes. For flat pitched roofs, the slope is determined by the formula:

That is, in the above example, the calculation is performed as follows: 1:10×100=10%.

In order to calculate the length of the slope based on the percentage of slope, it is necessary to use special tables or geometric formulas. If one of the sides of a right-angled triangle is known, then the slope percentage allows you to calculate the second leg, then using trigonometric formulas the angle is calculated, and only after that the length of the hypotenuse of the right triangle is calculated. The length of the slope is the main parameter during the design of the truss system and determining the amount of materials for covering the roof. Without this value, it is impossible to buy the right amount of metal tiles, choose best option roofing, decide on the architectural style of the building.

In degrees, the angle of inclination is determined much easier, all existing Building tools in their work they use the principle of an ordinary school protractor.

Calculator for calculating the length of rafter legs

What is the minimum tilt angle

Of course, with such parameters there can only be flat pitched roofs. Most developers think that the slope of the roof is only needed to drain water and minimize snow accumulation. Is this really the case, let's find out in more detail. Design features of the appearance are not related to engineering calculations and are not taken into account yet.

Manufacturers indicate a minimum angle of inclination of 10–11 °, why is there such a restriction?

How practically the angle of inclination affects the performance of the roof

Roof slope ratings have a significant impact on roof performance. Not all of them are positive, there are also negative ones.

Advantages of a large angle of inclination

The minimum slope angle for a roof made of metal tiles is very rare in practice. Why do developers not want to have such structures on their buildings? What are the benefits of increased slope? The simplest and most correct answer is that natural tiles are laid only on slopes with a slope of at least 30 °, respectively, its metal imitation will look very strange on flat roofs.

How to determine the angle of inclination

In addition, a large angle provides the following advantages.

Reduces the likelihood of moisture getting between the sheets of the coating. This problem has already been considered in more detail above, and with an increase in the angle of inclination, the situation improves much.
Significantly reduces the load on all elements of the truss system in winter period time. The higher the slope, the less snow on the roof. But with an increase in this parameter, the windage of the roof simultaneously increases, this should be borne in mind when designing the truss system. Moreover, the forces from the wind do not act vertically, but horizontally, which requires special construction measures to increase stability. load-bearing structures in the horizontal direction.
High ridge height allows developers to significantly expand their use cases attic space. In many cases, they can be converted into residential ones - the living area of \u200b\u200bthe house increases with minimal financial additions.

An example of a hip roof with a large angle of inclination

There are also negative sides increasing the slope of the roof slopes.

The cost of the roof increases: the truss system becomes more complicated, the actual consumption of all building materials, including roofing, increases.
There are problems during the operation of the roof. Often it is required to install additional engineering communications on the roof, perform repair work etc. The greater the slope, the more difficult it is for the craftsmen, the more difficult the safety devices.
The wind load increases. It is necessary to change the design of the truss system.
There is a need to install snow retainers. Snow does not avalanche from flat roofs; there is no need to install special snow retainers. Experienced Builders know that every extra hole in roofing materials reduces the reliability of the coating.

On roofs with a large angle of inclination, snow guards are necessary

Practical advice. The greatest amount of snow accumulates on slopes with a slope of 20-35°, this should be borne in mind when making a final decision.

What Factors to Consider When Choosing a Slope

Most buildings with metal roofing have an angle of inclination in the range of 45–60 °, the higher the inclination, the more comfortable the attic rooms. The choice of the optimal angle of inclination should begin with an analysis of the weather conditions.

Important. When choosing the parameters of the truss system, one cannot take into account only the advice of designers, the main attention should be paid to the reliability and practicality of the design. And these parameters depend on engineering solutions and the correct calculations of the roof elements.

Features of the truss system with a slight slope of the slope

On time design flat roofs with a minimum slope, architects take all measures to increase the stability of the structure. From the many existing options for solving the problem, those that require minimal financial investments are selected.

Reduce the pitch of the rafters

This allows the use of ordinary boards with a thickness of not more than 50 mm for their manufacture. Economic calculations show that it is much more profitable to reduce the pitch by about 10–15 cm than to make a truss system from thick lumber.

Edged board rafters

Use extra stops

Not all truss systems allow the use of this method, but at the slightest opportunity, designers provide for them. The fact is that for the manufacture of stops, you can use the cheapest materials, including used ones. Only vertical forces act on them, and the lumber holds them perfectly. The boards have low values of resistance to bending, they work very well in compression.

Rafters on supports

Seal joints securely

Flat roofs are shed, they do not have valleys, this greatly simplifies the process of building structures and reduces the likelihood of leaks. But such designs have their own problems - more likely undermining sheets of metal tiles by gusts of wind. This is explained by the fact that a significant speed of movement of air masses along the surface of the coating creates a rarefaction above it. Accordingly, there are significant efforts that tear off the sheets from the crate. Self-tapping screws for fixing metal tiles have rubber gaskets to seal the holes. If they are often compressed / unclenched, then microcracks form due to material fatigue. In the future, they increase in size and can cause water leaks.

Self-tapping screws for metal tiles

For flat roofs, leaks are more dangerous than for pitched roofs for two reasons.

First, the small attic space of a flat roof makes periodic monitoring of its condition much more difficult, leaks are often detected only after negative consequences are noticeable in the interior. Late elimination of problems significantly increases the cost of repairs.
Second - natural ventilation the under-roof space of flat roofs is much worse than pitched ones. As a result, the evaporation of moisture takes more time, wooden structures wet, which accelerates the development of putrefactive processes.

flat roof house

Reduce pitch between screws

Manufacturers recommend screwing self-tapping screws in a checkerboard pattern through the wave. But this recommendation is justified on pitched roofs with a slope of at least 20 °. For flat roofs, professional craftsmen advise reducing the distance between the hardware. This is done in order to increase the reliability of fixing sheets of metal tiles and eliminate the likelihood of them being blown up by the wind.

Conclusion

The more carefully you approach the choice of the slope of the metal roof, the less problems will appear during the operation of the building. It must be remembered that sometimes the cost of repairing a roof can exceed the cost of building a new one. And if, due to leaks, it is necessary to change the decoration of the walls and ceiling interior spaces, you will have to lose very large financial resources.

Mistakes in the construction of the truss system are not only expensive, they have an extremely negative effect on the life of buildings, you should always keep this in mind. If your own knowledge is not enough, it is recommended to seek help from professional specialists. This will cost much less than the elimination of construction errors.

Video - How to measure the slope angle

The foundation and the roof are the two most important and complex architectural elements of any building. The load-bearing elements of the roof are the truss system, and its performance largely depends on the angle of inclination of the slopes. Ordinary developers choose optimal angle roof slope, based on other criteria than the designers. And how to choose and calculate the optimal angle of inclination of a gable roof, read on our website.

Advantages and disadvantages of metal tiles

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:

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

Among the shortcomings, users and experts most often note:

increased noise during rain or hail;
the need to use snow retainers due to an avalanche of snow;
a large number of fasteners that are under the direct influence of precipitation;
a grounding device is required to protect against the buildup of static electricity.

NOTE! It should be noted that there is a type of metal tile with an additional protective layer as a sprinkle of crumbs. natural stone. Unlike classic spraying, this composite coating gives a solid appearance and well protects the house from noise penetration.

The composition of the roofing sheet

The quality indicators of metal-tiled roofs largely depend on:

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

The angle of the roof for metal tiles

The minimum angle of inclination of a metal roof is 10 degrees.

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

In choosing the optimal slope, it must be taken into account that if the slope is too small, it will be difficult to use the attic space.

In the case of a high building height, it may be difficult to access the roof for technical measures. From an increase in the angle of inclination, an increase in the surface area occurs, which will negatively affect the final cost of materials and work performed.

The correct calculation of the parameters of the angle of inclination is impossible without taking into account the following components:

which of the models of the corrugated surface of the metal tile will be selected for use. The characteristics of some manufacturers initially included data on the minimum allowable slope;
what design is meant - single-sided or double-sided;
the possibility of snow removal after the installation of the roof.

IMPORTANT! Taking into account these conditions, without having additional introductory in the form of a special climate zone, can be taken as the basis for the optimal slope with a slope length of about 6 m. p. A value of 22 degrees.

This number is not in technical documents on the arrangement of roofs, it was obtained empirically as a result of observations of the exploited metal-tiled surface.

How to choose a roof angle for a metal tile?

How to calculate the optimal slope?

To accurately calculate the angle of inclination, you need to know two dimensions:

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

For a shed 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 mistakenly believe, but the top of the parapet, as the basis for supporting the rafters.

In practice, there are options for roofing, the minimum slope for metal tiles is less than 10 degrees. These exceptions apply special recommendations for construction.

The step of the metal tile depending on the angle of the roof

In view of the increased snow load, a reinforced structure of the truss system is made with a continuous sheathing device. A waterproofing carpet is laid on it, subject to all norms. When laying under the transverse and longitudinal joints of the sheets, special gaskets are installed.

>Useful video

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

Roofs made of metal tiles are a practical and popular solution for the construction of private low-rise buildings. This roofing material is characterized by high bearing capacity, resistant to mechanical damage external environmental factors and intensive loads. The durability and reliability of the finish coating depend not only on quality, these characteristics are influenced by the design of the roof, including the correctly selected minimum slope. In this article, we will tell you how to choose the right slope angle and check it for compliance with SNiP.

What is a slope?

The slope of the roof is an important design parameter, which indicates the angle formed by the plane of the floors and the roof slope. This indicator is expressed as a percentage or degrees. It is calculated as the result of dividing the height of the ridge by half the width of the building. The angle of inclination of the slope depends on the technical and operational properties of the material and is regulated by SNiP and the manufacturer's instructions. Depends on it:

The possibility of using one or another type of roofing.
The design, composition and section of the elements of the truss frame.
The ability of the roof to effectively remove rainfall.
Roofing cost.
Roofing cake weight.

Note! If the slope of the metal tile roof is increased from 22 degrees to 45 degrees, the slope area will increase by 20%, which will affect the cost of materials (finishing, waterproofing, insulation, wood), as well as the weight of the structure. It is necessary to decide on the optimal angle of inclination during the preparation of the project in order to correctly determine the load on the foundation.

Roof slope calculation

Optimal values

Roofs made of metal tiles - relatively new constructive solution, therefore, the technology of its installation and operation is not clearly regulated by SNiP. Information about what the minimum roof slope should be is provided by the manufacturer, since this indicator directly depends on the technical characteristics of the material itself. This indicator is calculated in accordance with the thickness, bearing capacity and method of laying the roofing.

According to SNiP, the minimum angle of inclination of a metal roof, if the slope is 6 meters long, must be at least 14 degrees.
The permissible slope for a metal roof is in the range of 14-45 degrees.
The optimal angle of inclination, which ensures the effective removal of precipitation with less mercy on the slopes, should be 22 degrees.

The optimal angle of inclination for metal tiles

The choice of roof design

Important! Minimum slope roofs made of metal, which manufacturers allow, is 11 degrees. Some grades of material can be laid even if the slope is 10 degrees. The reduction in this indicator has made it possible to achieve the use of new, smoother polymers and stronger steel for the production of roofing.

Slope selection

It can be difficult for a non-professional builder to correctly choose the minimum angle of inclination of a metal roof. This indicator, in addition to the requirements of SNiP and manufacturer's recommendations, is influenced by other factors that must also be taken into account. When choosing the steepness of the slope, the following is taken into account:

Please note that the choice of the steepness of the slopes depends on the design of the roof. The optimal angle of inclination of the slopes of a shed roof made of metal is 20-30 degrees, and a gable roof is 20-45 degrees.

Features of roofs with a small slope

The minimum recommended slope angle of a metal tile roof is 14 degrees, however, experienced craftsmen can lay this type of roofing material with high quality, even if the slope of the slopes is in the range of 10-14 degrees. To increase the reliability of this design and reduce the risk of leaks, the following measures must be taken:

Increase the frequency of the battens and reduce the pitch between the rafters. To minimize the risk of roof collapse due to intense snow load, it is necessary to strengthen the truss frame of the structure and mount a frequent or continuous crate.
Increase overlaps. Manufacturers recommend that when installing metal tiles, make a horizontal overlap of 8 cm, and a vertical one of 10-15. To eliminate the possibility of leakage in structures with gentle slopes, you can increase the overlap at the joints of the sheets.
Isolate joints. To prevent the penetration of melt and rain water between the joints of the sheets, it is possible to process the seams silicone sealant, although this measure has limited time actions.

Step between rafters depending on the slope

Experienced craftsmen say that the easiest way to make a reliable metal roof is to follow the manufacturer's recommendations and strictly observe the recommended angle of inclination.

The minimum slope of the hip roof. What is the minimum angle of inclination of a roof from a metal tile

The construction concept of "slope" is associated with the slope of the roof. This is the angle of the slope to the horizontal surface. A smaller degree of angle makes the roof slope steeper. The calculation of the angle is based on the principle: the height of the ridge board is divided by 0.5 of the width of the room, as a percentage - multiply by 100. Visually: we divide the width of 20 m and the height of 5 m and we get 0.5, we multiply by 100 and we get 50%.

The minimum angle of inclination is affected by climatic conditions terrain. A slope of 30 degrees is used in regions with abundant precipitation. In arid areas, roofs are built with a slope of 10-25 degrees.

Building material - metal tile - is used in the construction of buildings of various complexity. Exception - the minimum angle of inclination for a metal tile is from 14 degrees, no less. Such a slope is able to withstand strong gusts of wind, unlike snow, which cannot roll down such a small slope.

The minimum slope allows you to save on building materials. Reliability and a solid foundation of the roof will be created by a wooden crate, a small distance between its boards will make the fastening of the metal tile strong.

A few tips for setting and coordinating the minimum roof pitch

Layers of metal tiles should be laid on a perfectly flat surface, the height of the row cannot be more than one meter
Take layers should be in construction gloves that protect hands from damage
You need to hold the layer by the edges
Securely fasten the metal tile to the crate with construction screws
Walk on the roof of metal tiles in special soft shoes that do not damage the surface of the roof, do not step on the waves of tiles
Cutting of metal tiles should be carried out according to preliminary scheme by measuring the desired dimensions of the sheets

Preliminary Processes:

The truss system must be completely ready. We measure slopes
We eliminate the existing errors of the triangular shape with additional details
It is recommended to get rid of moisture between the metal tile and the insulation layer thanks to the crate (height 0.4 cm)
We leave gaps of 0.5 centimeters in the cornice sheathing
We lay waterproofing on the rafter boards. From the edge of the cornice board, the waterproofing should have a sag of 0.2 centimeters. We lay the waterproofing joints with an overlap of 15 cm.
We insulate the roofs with special plates. We lay them between the rafters
We apply the next layer - vapor barrier

Detailed introduction to the video in the next tab.

Additions for the installation of the roof and the arrangement of its minimum slope

Roof installation involves a complex process, and to avoid important nuances just not possible:

It is impossible to mount a metal tile in the upper bend of the wave
Self-tapping screws are not tight
Don't use a hammer
Screw in self-tapping screws with a special lining
When cutting metal tiles, you need to use electric scissors or other special tools (do not use a grinder)
Do not use construction foam

The slope of the roof is formed due to the structure of the rafters, it is they who create the angle. For details on installing the roof and setting its minimum angle, see the video in the next tab.

Tiles - roofing material made of fired clay, plastic or metal.

The metal tile is considered one of the most reliable and durable materials, due to its characteristics, such as wear resistance, practicality and decent appearance. Thanks to her, it is possible to update old roof. To do this, you do not need to remove the used materials - on the contrary, they will serve as additional waterproofing. For correct installation calculate the minimum slope of the roof of the metal.

Metal roofing is one of the most durable and strong materials.

Many people have a question, what is a bias. Slope - the angle of inclination of the slope to the horizon. The larger the angles, the steeper the roofs. To calculate the slope, you need to divide the height of the ridge by 1/2 of the width of the building, and to express this value as a percentage, multiply it by 100. For example, with a building width of 10 m and a ridge height of 4 m, the slope will be: 4: 5 \u003d 4 / 5 = 0.8. To express as a percentage, multiply by 100: 0.8*100=80%.

Installation instructions will be incomplete without some rules. It is strictly forbidden:

fasten the metal tile to the upper deflection of the wave;
excessively tighten the screws;
use hammer;
use nails and self-tapping screws without gaskets;
use mounting foam as ridge and valley seals;
use an angle grinder such as a grinder.

For cutting sheets, electric nibblers or metal shears are used. Steel shavings and other debris are removed only with a soft brush. To protect the sheet from corrosion, it is necessary to immediately paint over all the scratches found during installation with special paint. Three months after the start of operation, it is necessary to tighten all mounting screws.

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

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

the use of galvanizing the sheet and its coating with durable polymer paints in order to impart anti-corrosion properties;
wide choice of color architectural solutions;
manufacturability and ease of installation of the roof, which does not require the use of special tools and fixtures;
the lightness of the material, which allows it to be mounted at high altitudes and in conditions of complex truss structures;
no heavy load on the rafters due to the light weight of the sheet;
with a relatively thin sheet, it can withstand quite large loads, since it has stiffeners.

All of these properties make it possible to use this coating in difficult climatic conditions. To calculate the amount of material, you need to know the minimum angle of inclination of the metal roof.

How to determine the angle of the roof in your area

To calculate the strength of the roof structure and the number required material you need to know the optimal one. A number of factors must be taken into account, including:

projected number of slopes;
used roof space;
Economy indicators;
structure weight.

It would seem that the steeper the slope, the better, but this leads to an increase in material consumption and increased weight, as well as to a large wind load on the structure. Therefore, there is such a thing as the optimal angle of inclination of a roof made of metal.

A slight slope, about 10-12 degrees, has its drawbacks, which require an increase in the rows of the crate and reinforcement of the rafters, due to the increased snow load. In addition, you should take care of improved waterproofing and the need to increase the overlap of sheets. This is done to prevent leaks at the joints with gentle slopes. Roofs of this design are best suited for the southern regions, where the snow cover does not have much weight, and the average annual temperature is not too low. IN summer period sloping roofs warm up less, which creates in the dwelling 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. It is necessary to fasten the sheets, in the case of steep slopes, more often than usual, because they are prone to slipping under the influence of gravity. The greater the angle of inclination of the roof, the more time-consuming during installation and less economical it will turn out.

What is the optimal angle of inclination of the roof recommended by the manufacturers of this building material? After the tests, enterprises producing metal tiles recommend using it when the slope is from 11 to 45 degrees. In this case, the most acceptable is the angle of inclination from 12 to 22 degrees. building codes and the rules do not give clear recommendations on this matter, but the preferred, with a slope length of about 6 meters, is an angle of inclination equal to 14 degrees. We have come to the choice of the most economical way to cover 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 climatic zone, the architectural solution and the aesthetic preferences of the owners of the dwelling, the following types of roofs are erected:

a multi-gable roof with a complex and slender structure;
vaulted roof as an element national culture in architecture;
hip roof, complex four-pitched structure;
hipped roof, a combination of isosceles triangles;
gable roof, widespread and time-tested;
the roof is shed, 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 the choice of minimum tilt angles ranging from 22 to 45 degrees. Hip roof used as decorative element, and the angle of inclination of the isosceles triangles is in direct proportion to the area covered by the tent. This structural element very economical to manufacture, and the angle of inclination ranges from 35 to 45 degrees.

One of the most popular roofs, gable. The manufacturer recommends observing the minimum angles of inclination of the roof in the range of 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 such characteristics that the roof resists possible strong winds well, and also represents practically monolithic structure which prevents the penetration of moisture into the under-roof space of the building.

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

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

Why the roof should not be too flat
The minimum allowable and optimal slope for metal tiles
Design features of the truss system
- What materials and tools will be needed
- Assembling a warming cake
- Installation of metal tiles

The minimum angle of inclination of roofs made of metal tiles is one of the most important parameters, which must be taken into account when developing a project for a truss system at home. A reliable and durable roof will be obtained only if the standards recommended by the manufacturer are observed.

The minimum allowable and optimal slope for metal tiles

Since they are made roofing sheets of this variety of high-quality steel, they can withstand quite serious loads. However, their relief texture contributes to the retention in the winter time on the roof a large number snow. And therefore, it is still not recommended to do too gentle slopes for this material, as well as for any others, despite its strength.

The minimum slope of a metal tile roof is 12º. But most manufacturers still advise installing rafters under sheets of this variety at an angle of at least 14º. There are also special brands of metal tiles on the market, which can be mounted on very gentle slopes - only 11º. But this coverage option is rarely found on sale. In any case, when buying a metal tile of a particular brand, you should carefully study its technical passport. The allowable slope is indicated in it necessarily.

They make roofs with a slope of 12º quite rarely. Most often, the angle of inclination of the roof slopes of a country house sheathed with metal tiles is 34-35º. This is the best and actually very convenient option. With such a slope, the material does not take too much, and the roof itself looks harmonious and impressive. In addition, it is precisely such an angle that is easiest to make with a standard lumber length of 6 m. A roof steeper than 35 º should be assembled only if it is broken and it is planned to equip a residential attic under it. An angle of 40-45º is considered optimal for layered rafters of such roofs.

Installation of metal roofing

This material is installed on the roof frame with the obligatory observance of the following recommendations:

Sheets are cut with electric scissors, but by no means with a grinder.
Walking on already installed sheets should be in soft shoes, stepping between the waves.
Mount sheets using special self-tapping screws with rubber gaskets. These fasteners are not too tight.
Self-tapping screws are screwed when attaching sheets to the crate exclusively under the wave.

When sheathing rafters with a length of more than 6 m, the metal tile is installed in rows in height. The width of the horizontal overlap in this case is determined depending on the angle of inclination of the slope. The lower the roof, the more water lingers on it during rain and the more airtight the joints should be. Therefore, in the event that the angle of inclination of the roof rafters is 12-14º, the metal tile is laid with an overlap of at least two waves. If this indicator is equal to 14-35º, it is allowed to carry out installation with the overlay of the sheets of the upper row on one wave of the lower one.

What materials and tools will be needed

Since the material of the metal tile is cold, and during the rain it is also noisy, the roof sheathed with it is usually insulated. At the same time, not polystyrene foam is often used as an insulator, but mineral wool. The fact is that fibrous materials, among other things, are very good noise absorbers. In addition to mineral wool, for sheathing the roof with metal tiles you will need:

vapor barrier membrane;
waterproofing film;
roofing screws and galvanized nails;
thin steel wire;
bars with a thickness of at least 3 cm for the counter-lattice;
framing boards.

If the roof is not included, you will also need to purchase all the necessary additional materials: cornice strips, valleys, an apron for the pipe, ridge bar etc.

Of the tools you will need:

drill, screwdriver;
electric scissors for cutting metal tiles;
long rule and roulette;
construction stapler;
hammer;
folding ladder.

Assembling a warming cake

Installation of a roofing cake when used as a sheathing of a metal tile is carried out in the following order:

Attached to the rafters from the side of the attic vapor barrier material. You can fix it with a construction stapler.
The heat insulator is installed. It should be installed between the rafters by surprise. In order to arrange a support under mineral wool, from the side of the attic on top vapor barrier film boards are stuffed or steel wire is fastened in a zigzag pattern.
Mounted on top of the heater waterproofing material. It should be fixed in a horizontal direction with a sag of about 2 cm. Otherwise, when the roof frame moves, the film may break. Fix the membrane to the rafters with bars.

Principles of insulation There are two large class roof structures: flat and pitched (or attic). A…

Why the roof should not be too flat

There is a direct relationship between the final cost of the roof and its angle of inclination. The position of the slopes, the less material is spent on the installation of the truss system and the assembly of the roofing pie. However, the angle of inclination of the rafters cannot be made very small. Otherwise, too much snow will accumulate on the roof in winter. If the load exceeds the maximum allowable values, the roofing may simply not withstand. In addition, very sloping roofs made of metal tiles on private houses in most cases do not look very harmonious. It is impossible to arrange a comfortable attic or attic under them.

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The minimum allowable and optimal slope for metal tiles

Since roofing sheets of this variety are made of high-quality steel, they can withstand quite serious loads. However, their relief texture contributes to the retention of a large amount of snow on the roof in winter. And therefore, it is still not recommended to do too gentle slopes for this material, as well as for any others, despite its strength.

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Design features of the truss system

The roof frame for metal tiles is usually assembled using standard technology. However, the truss system for such roofing material still has some of its features.

When assembling it, consider the following:

The recommended step between the rafters under the metal tile is 60-90 cm.
For the rafters themselves, you should take a bar with a section of at least 50x150 mm.
The crate is arranged from a thick board 30x100 mm.
The step of the roof sheathing under the metal tile directly depends on the size of the sheet segments of the selected brand.

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Installation of metal roofing

This material is installed on the roof frame with the obligatory observance of the following recommendations:

Sheets are cut with electric scissors, but by no means with a grinder.
Walking on already installed sheets should be in soft shoes, stepping between the waves.
Sheets are mounted using special self-tapping screws with rubber gaskets. These fasteners are not too tight.
Self-tapping screws are screwed when attaching sheets to the crate exclusively under the wave.

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What materials and tools will be needed

Since the material of the metal tile is cold, and during the rain it is also noisy, the roof sheathed with it is usually insulated. At the same time, not expanded polystyrene, but mineral wool is more often used as an insulator. The fact is that fibrous materials, among other things, are very good noise absorbers. In addition to mineral wool, for sheathing the roof with metal tiles you will need:

vapor barrier membrane;
waterproofing film;
roofing screws and galvanized nails;
thin steel wire;
bars with a thickness of at least 3 cm for the counter-lattice;
framing boards.

If the roof is not included, you will also need to purchase all the necessary additional materials: cornice strips, valleys, a pipe apron, a ridge strip, etc.

Of the tools you will need:

drill, screwdriver;
electric scissors for cutting metal tiles;
long rule and roulette;
construction stapler;
hammer;
folding ladder.

Back to index

Assembling a warming cake

Installation of a roofing cake when used as a sheathing of a metal tile is carried out in the following order:

From the side of the attic, vapor barrier material is attached to the rafters. You can fix it with a construction stapler.
The heat insulator is installed. It should be installed between the rafters by surprise. In order to arrange a support under the mineral wool, boards are stuffed from the side of the attic over the vapor barrier film or steel wire is fastened in a zigzag manner.
A waterproofing material is mounted on top of the insulation. It should be fixed in a horizontal direction with a sag of about 2 cm. Otherwise, when the roof frame moves, the film may break. Fix the membrane to the rafters with bars.
The chimney is waterproofed. The film is wound on it and glued with mastic.
Install the crate. It should be stuffed into bars using galvanized nails. At the locations of the valleys and near the chimney, the crate must be made continuous.

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

Of the three types of metal roofing material, profiled sheet coating stands out favorably imitating natural tiles- metal tile.

Its basis is rolled steel coated with an aluminum-zinc compound for resistance harmful effects environment. For increased stability finishing layer additionally for metal inflicted polymer coating . In this article, you will learn how to calculate the roof angle for a metal tile and what factors affect the roofing.

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;
does not require special skills during installation;
wear resistance;
long service life;
elegant and festive look, suitable for any design developments.

Among the shortcomings, users and experts most often note:

increased noise during rain or hail;
the need for use due to snow avalanche;
a large number of fasteners that are under the direct influence of precipitation;
a grounding device is required to protect against the buildup of static electricity.

NOTE!

It should be noted that there is a type of metal tile with an additional protective layer as a topping of natural stone chips. Unlike classic spraying, this composite coating gives a solid appearance and well protects the house from noise penetration.

The composition of the roofing sheet

Qualitative indicators metal roofing in many ways depends on:

necessary 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 the snow load. Increasing the slope, to reduce this impact factor, increases the possibility of increased wind load, which also negatively affects the metal thinner than the specified value;
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 the use of a grinder, treat the cutting site with a protective compound ;
mandatory presence of an anti-condensation screen from. Need to know that a superdiffusion protective membrane cannot be used as such an anti-condensation material, since its use implies more frequent and prolonged exposure to moisture on the inner surface of the sheet.

What factors affect the roof?

Main factors that adversely affect the condition and durability metal tiles are divided into three types:

short-term

the weight of people and building materials, during the installation and maintenance of the roof;
normative snow loads;
temperature climatic effects;
wind loads.

Long

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

Special

seismic impacts;

All components in the construction of the truss system are guaranteed to ensure the resistance of the metal-tiled coating to the maximum allowable overloads.

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

The angle of the roof for metal tiles

Minimum Angle metal roof slope is 10 degrees.

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

In choosing the optimal slope, it must be taken into account that if the slope is too small, it will be difficult to use the attic space.

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

which of the models of the corrugated surface of the metal tile will be selected for use. The characteristics of some manufacturers initially included data on the minimum allowable slope;
what design is meant - single-sided or double-sided;
possibility of snow removal after .

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

This figure is not in the technical documents for the installation of roofs, it was obtained empirically as a result of observations of the exploited metal-tiled surface.

How to choose a roof angle for a metal tile?

How to calculate the optimal slope?

For an accurate calculation of the angle of inclination, it is necessary know two sizes:

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

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

In practice, there are options for roofing, the minimum slope for metal tiles is less than 10 degrees. These exceptions apply specific building instructions.

The step of the metal tile depending on the angle of the roof

In view of the increased snow load, a reinforced structure of the truss system is made with a device solid battens. A waterproofing carpet is laid on it, subject to all norms. When laying under the transverse and longitudinal joints of the sheets, special gaskets are installed.

Useful video

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

The process of selecting the right roof slope is one of the main activities. On the one hand, it has an aesthetic value, and on the other, a practical one. This characteristic affects the overall performance parameters, service life, the amount of materials used. The minimum angle of inclination of a metal roof has some features that impose their limitations. It is about them that we will talk further.

Features of roofing material

The fact that metal tiles are so popular among the population in private construction can be explained by its positive aspects:

Light weight. Ability to build complex geometric shapes. No need to further strengthen the truss system. Absent high load on the walls and foundation of the house.
The laying technology does not differ in complexity. Available even without special skills. No specialized equipment required.
Large selection of colors. Can be matched to any home decor.
The slope of the roof can withstand severe loads due to profiled waves.
Metal sheets are protected against corrosion by an external polymer coating.

Modern roof coverings must have high functional and decorative characteristics, as they must provide high level protection and look attractive.

The metal tile has gained its popularity due to its long service life, performance properties and low price. However, it has its own characteristics and limitations for use.

During design, it is necessary to clearly understand what is the minimum angle of inclination of the roof that is acceptable. The following will depend on it:

The possibility of coating with one or another material;
The design of the entire truss system;
Level of snow and wind loading;
Sediment removal efficiency.

Roofing from a metal tile can have a very small slope. This is ensured by the rigidity of the sheets. Another advantage will be the possibility of unhindered removal of deposits due to the minimum surface roughness.

What influences the choice?

The angle of inclination of a roof made of metal tiles does not have unified values. The minimum performance will be influenced by many parameters that need to be taken into account at the design stage of the project.

Wind loads. It is calculated on the basis of the total roof area, the average wind strength in the construction region. All information about the region can be found in directories or online.

Snow loads. In winter, snow collects on the surface, and then slides under its own weight. If the level is low, then the snow will have to be removed manually to exclude the possibility of damage to the truss system under its weight. With steeper slopes, snow is removed more quickly on its own. Average level Snowfall in the region can also be found from the Internet or relevant directories. It is necessary to develop a project with safety margins in order to avoid possible deformations in the event of heavy snowfall.

The angle of inclination of a shed roof made of corrugated board also depends on the type of heating, thermal insulation of the entire structure and the under-roof space. With an insufficient level of thermal insulation, significant heat loss is observed. This can cause the snow to melt and accumulate more slowly. The water will flow down. By performing thermal insulation measures, heat loss is reduced. As a result, snow will accumulate more actively. When calculating the slope without thermal insulation materials, there is a chance that the coating will not withstand the increased snow pressure.

The amount of rainfall should also be taken into account. The optimum level will be at least 22 °. With a smaller slope, it will be necessary to lay metal tiles using sealants. It will prevent the penetration of liquid through the joints.

In addition, it is necessary to take into account the shape of the structure. So, for single slopes, 20-30 ° will be ideal, for double slopes - 20-45 °.

Minimum slope values

In accordance with the requirements of SNiP, with a rafter length of more than 6 meters, the minimum roof angle from corrugated board is 14 °. It is based on calculations of average pavement strength and load resistance parameters. Despite this, during the development of the project, it is worth paying attention to the recommendations of manufacturers.

In most cases, manufacturers indicate that the roof angle for metal tiles should be designed at 12 °. Individual manufacturers have options suitable for slopes of 11°. The decrease in parameters is associated with the improvement of individual technical parameters of the material - increased rigidity and a smoother surface.

It should be noted that metal tiles can be built in certain areas where there is no heavy rainfall. A slight slope provides stability, but seriously increases the snow load, because. snow does not roll.

Roofs for a house made of metal tiles with minimal parameters can reduce the consumption of materials during the construction process. Such roofs are preferable in the southern regions, in which the amount of precipitation does not exceed the norm.

Optimal values

The surface area directly depends on the slope. Steeper structures are not able to hold precipitation on the surface, which is quickly removed downward. However, high ones have a large windage. Besides that, it takes more. From this it can be concluded that the higher the roof and the steeper the slope, the more expensive it will be.

It must be taken into account that the increased windage of the roof with high ridges does not allow the construction of such structures in regions with strong winds. They are not able to withstand such influences all the time.

The slope, including the angle of inclination of a shed roof made of corrugated board, affects the resistance to loads. To increase the strength of the structure with small slopes of the slopes, it will be necessary to create a more frequent crate. It will strengthen the entire truss system, as well as overall reliability.

Even taking into account the absence of restrictions on the use of metal tiles for cool designs it is still not very suitable for such structures. At more than 45 ° sheets are able to move down under their own weight. To exclude this allows the arrangement of additional fixation points.

Based on many years of construction experience and the recommendations of manufacturers, we can say that the most optimal slope of the roof covered with metal tiles will be 22 °. Rainfall does not linger on it. Economical to build. Strong and reliable, able to withstand severe wind loads.

How to calculate?

i = H / (1/2L)

i - slope, which is calculated

H - size from ceiling to ridge

L - width of the house

The result can be converted to a percentage by multiplying by 100.

The most common values are in degrees. They are calculated based on the trigonometric function arctg. There is nothing complicated, since there are tables for translation.

It is possible to use a similar calculation for two and single-pitched roofs. In the case of a single-slope option, the full span length will be taken into account. If there are unequal slopes, then the distance from the ridge to the ceiling is applied. The angle of inclination should be determined separately for the slopes.

On roofs with complex structures and drops, slope correction factors relating to horizontal projections are used.

Positive and negative sides

When deciding, you need to take into account other factors that can influence. They can be positive and negative.

First, let's look at the positive criteria that affect the construction.

The possibility of arranging residential premises (mansards) of large areas;
For structures with large values, the possibility of water penetration into joints and connecting elements is excluded. This helps to increase the service life;
In areas with significant snowfall at roofs from 45 °, they may not be taken into account. You can save on installing snow retainers.
By properly designing the slope, you can do without the use of special fasteners.

Let's take a look at the negatives:

An increase in slope leads to an increase in material consumption;
The mass of the roof also increases with an increase in the level of the slope. This is a direct increase in the load on the truss system. Requires reinforcement;
At sharp angles and a significant height, windage increases. It also needs reinforcement.
The process of water disposal becomes more difficult. Required drainage system, which has more throughput. Sometimes this is problematic.

The process of calculating the optimal slope is to find compromise solutions that will take into account all the features of the construction of the structure and appearance.