The minimum roof angle for metal tiles. The minimum slope of the metal tile in degrees. Positive aspects of a small angle of inclination

The slope of the roof made of metal tiles must correspond to the permissible values, otherwise the roof will not be able to successfully withstand the operational loads.

Technological features of metal tiles

The high popularity of metal tiles in private housing construction is explained by its unique characteristics.:

1. Low weight (5-7 kg / m2). This material allows you to equip roofs with complex geometric shapes, does not require additional strengthening of the rafter system when changing the roofing, does not exert a high load on building structures and the foundation of the structure.
2. Simple installation technology allows lay roofing for non-professionals; no special equipment is required for work.
3. A wide range of color solutions makes it possible to choose the shade of the roofing that is in harmony with the overall appearance of the house.
4. The metal tile, made of steel sheet with a thickness of 0.4 - 0.7 mm, is able to withstand significant loads due to the presence of a profile.
5. The metal is reliably protected from corrosion due to galvanizing and an additional outer layer made of polymers with different physical and technical properties.

High requirements are imposed on modern roofing materials with regard to their functional and decorative characteristics, since the roof must provide reliable protection of the building from external influences and look aesthetically pleasing.

Metal tile attracts consumers with a combination of durability, performance parameters and relatively affordable cost. However, the physical capabilities of this roof covering impose some restrictions on its use.

When choosing a metal tile when designing a roof, you should take into account such a parameter as the minimum permissible slope angle for installing this type of coating.

From such an indicator as the minimum angle of inclination of the roof depends:

• the possibility of using one or another roofing material;
• design features of the rafter system;
• the ability to withstand the snow load typical for the region;
• the ability to effectively (in full, in a short time) remove precipitation from the roof surface.

The minimum slope of the roof made of metal tiles is quite low due to the stiffness of the profiled steel sheets, as well as the low surface roughness, which is provided by a protective polymer coating. Such a roof is able to withstand precipitation quite successfully.

Factors affecting the choice of the angle of inclination of the slopes

In fact, there are no unified angles of inclination of the slopes of a metal-tile roof. The minimum slope of slopes with a given surface is influenced by a number of factors that should be taken into account in the design process.

The choice of the minimum slope of the projected roof is influenced by the presence of heating pipes, as well as the thermal insulation of the house itself and the roofing pie. If the roof is not sufficiently insulated, significant heat losses occur through the roof. This means that the snow falling on it melts and accumulates more slowly, as moisture flows down. By providing additional thermal insulation for the roof, made according to the project, it is possible to reduce heat loss, but at the same time, snow on the roof will begin to accumulate more actively. If the slope was calculated before thermal insulation, then there is a possibility that the roofing will not be able to withstand increased snow loads.

Factors influencing the choice of slope include the amount of rain moisture. It is best if the slopes are at an angle of at least 22 degrees. A roof made of metal with a lower slope is required to be installed using a sealant that will help prevent moisture from seeping into the roofing pie at the joints.

The shape of the roof should also be taken into account. The recommended slope angle for a single-pitched roof is 20-30 degrees, for a gable roof - 20-45 degrees.

The minimum angle of inclination of the slopes

According to the requirements of SNiP, if the length of the slope is 6 meters, the minimum permissible slope angle of the roof made of metal tiles is 14 degrees. This parameter is calculated based on the average strength of the material, its ability to withstand high loads. However, when designing a roofing system, you should pay attention to the recommendations of the manufacturer of the selected roofing material.

In most cases, manufacturers indicate that the minimum slope for metal tiles should be 12 degrees. Some companies produce material suitable for installation on roofs with a slope of 11 degrees. Changing this parameter downward became possible due to the improvement of the technical characteristics of a number of metal tile models: it has increased rigidity and is equipped with a smoother and more slippery coating.

It should be noted that a metal-tile roof with a minimum angle of inclination can be used only in certain climatic conditions, that is, in regions where there is no large amount of rain and snow. The small slope angle allows the roof to perfectly withstand wind loads, but significantly increases snow loads, since the snow does not roll under its own weight.

Metal roofing with a minimum angle of inclination is most relevant in an area characterized by a large number of sunny days per year. Such a roof has a smaller area, due to which it heats up much less, and this has a beneficial effect on the microclimate inside the house. The minimum angle of inclination makes it possible to save money on materials for the construction of the rafter system and laying the roofing pie, since they are required less than when building a steeper roof.

A metal roof with a minimum slope of slopes is a practical and economical option for arranging southern regions with a small amount of average annual rainfall.

If the slope for the metal tile is less than that specified by the manufacturer, this will lead to the fact that the roofing cannot provide reliable protection of the building from moisture. In addition, in regions with heavy snowfall, there is a risk of collapse of such a metal roof.

Choosing the optimal roof slope

The larger the slope angle, the larger the total roof surface area. A roof with steeper slopes does not keep snow and water on its surface, precipitation effectively rolls down. But at a high roof, the windage increases, in addition, during its construction, more material is required for the rafter system and roof.

The higher and steeper the roof, the more expensive it will be to build and the more difficult to install.

It should be borne in mind that due to the increased windage of high roofs, metal-tile roofs with a large angle of inclination are not recommended to be built in regions with strong winds, as they may not withstand mechanical stress.

The slope of a metal roofing roof affects its ability to withstand loads. To increase the strength of a roof with a slight slope, more frequent lathing may be needed, which will not only strengthen the rafter system, but also increase the reliability of the roofing.

Despite the fact that there are no specific restrictions on the use of metal tiles for gabled roofs, this material is not very suitable for covering such roofs. If the angle of the slope exceeds 45 degrees, the sheets of metal tiles can slide down under their own weight. To avoid this, when installing the sheets, it is necessary to provide additional points for attaching the material to the crate.

Roof tiles are a roofing material made of baked clay, plastic or metal.

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

Metal tiles are one of the most durable and durable materials.

What is bias?

Many people wonder what bias is. Slope - the angle of inclination of the slope to the horizon. The larger the corners, the steeper the roofs. To calculate the slope, 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 = 4 / 5 = 0.8. To express as a percentage, multiply by 100: 0.8 * 100 = 80%.

The minimum directly depends on the weather conditions in the region. A slope of 40 degrees and above is used in areas where precipitation prevails. In regions with a dry climate - within 5-25 degrees.

Minimum slope

Metal tiles can be installed on all types of building structures. But there is one limitation: the minimum slope angle of the ramp should not be less than 14 degrees. At this angle, the wind loads will be minimal, but the load from the fallen snow, on the contrary, is maximum, since it will not be able to roll down due to a slight slope. With a minimal slope, you can save on roofing material. In this case, the load-bearing strength of the roof can be increased by using more frequent lathing, which, with a decrease in the pitch between its elements, creates a cushion of strength for the metal tile.

Work instructions

When working, you must follow some rules. The sheets should be laid on a flat place, the height of the stack should not exceed 1 meter. You can take the sheets only with protective gloves. When moving material, grab it by the edge of the stamping line. It is imperative to ensure that the wind does not rip loose sheets either on the ground or on the roof. It is necessary to move on the metal tile in shoes with soft soles; you cannot step on the crest of the wave. Before installation, you need to make a drawing and lay out sheets on it in order to determine the required amount.

Preparatory work

After installing the rafters, you need to make a control measurement of the slopes so that there is no deviation from the project. With a small defect of rectangularity (up to 10 mm), they must be hidden from the ends with the help of additional elements. To eliminate moisture from the under-roof space between the metal tile and the waterproofing, a crate is installed to create a ventilation gap, the height of which is 40 mm. It is necessary to leave 50 mm wide gaps in the overhang filing, and open the holes in the ridge seal.

Rolls of waterproofing are rolled horizontally along the rafters, starting from the eaves, the sag should be 20 mm. An overlap of 150 mm is made between the panels. Then work is carried out on thermal and sound insulation, for this mats or slabs are installed between the rafters. On the inner surface of the rafters with a stapler, the sheets of the vapor barrier film are fixed, which are overlapped and tightly connected with adhesive tape.

Sheathing device

The lathing is installed from the same boards and bars, treated with an antiseptic, which are packed at a distance of a tile pitch. First of all, falling bars are attached to the rafters on top of the waterproofing from the ridge to the cornice. Then sheathing boards are horizontally attached to them. Depending on the type of metal tile, the distance between the first and the middle of the second board is 300 mm or 350 mm, and between the midpoints of all other boards - 350 mm or 400 mm. Self-tapping screws are twisted between the crests of adjacent waves, necessarily below the stamping line by 10-15 mm.

Before installing the eaves, install the gutter holder for the gutter. The cornice itself is attached to the metal tile along the lower edge of the ramp with self-drilling flat head screws. The joint of the eaves is carried out with an overlap of 50-100 mm. In valleys, around chimneys, etc. a solid crate is performed. On the sides of the ridge strip, two additional boards are nailed. The lower valley plank is attached to the inner junction of the slopes to the crate, while making an overlap of 100-150 mm.

Installation of metal tiles

When measuring the slope, take into account that the metal tile is laid on the crate so that its edge protrudes outward by no more than 40 mm. It is impossible to exceed the maximum size, so as not to deform the sheet. With a slope length of more than 6-7 m, the sheets are broken into two or more pieces with an overlap of 150-200 mm. There is a formula by which you can calculate the overlap. To do this, the length of the bottom sheet must be equal to 0.2 + the size of the tile step * the number of tile steps along the slope. For the calculation according to this formula, a metal tile with a length of 3 m to 5 m is suitable.

There is an installation manual that says that if you make the overhang very long, it will sag. And if you make it, on the contrary, short, then water, snow, etc. will fall under it. If you choose the wrong lathing pitch, the roof will fail.

You can start stacking sheets from the left and right sides. When mounted on the left, the next sheet is installed under the last wave of the previous sheet and attached to the crate with special 4.8x28 mm self-tapping screws with a rubber insulating gasket. It is recommended to first fix three to four sheets with a self-tapping screw on the ridge before aligning with the cornice. And only then finally attach to the crate. For each square meter, 6 screws are needed, along the edge of the sheet is attached only in every second wave.

Profile sheets are screwed into the deflection of the profile wave under the transverse wave perpendicular to the metal tile with self-tapping screws 4.5x19 and 4.8x25.35 mm in size with a painted octagonal head. Along the edge, the sheet is attached only in every second wave, 7 self-tapping screws are needed for each square meter.

Installation of the valley and the ridge

After that, the upper valley is installed, which is attached to the top of the sheet wave with roofing screws. The bar should be installed strictly along the cord at a distance of 200-300 mm. In this case, damage to the lower chute must not be allowed.

After installing all the sheets and fixing the sealing gasket with ridge elements with an overlap of 100 mm, it is closed with roofing screws 4.8x80 mm at every second profile wave. A special profile sealing gasket is installed between the ridge and the sheets, which is attached to the crate with thin galvanized nails. For ventilation, a ridge fan is used, which is attached to the ridge with self-tapping screws, and the joint is treated with a sealant. The ends of the shaped ridge are closed with a decorative plug.

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

• to fix the metal tile in the upper deflection of the wave;
• tighten the screws unnecessarily;
• use a hammer;
• use nails and self-tapping screws without gaskets;
• use polyurethane foam as ridge and valley seals;
• use an angle grinder such as a grinder.

Electric nibblers or metal shears are used to cut sheets. 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 scratches found during installation with a special paint. Three months after the start of operation, it is necessary to tighten all fastening screws.

Metal roofs are a practical and popular solution for the construction of private low-rise buildings. This roofing material is characterized by high load-bearing capacity, resistance to mechanical damage, external environmental factors and intense loads. The durability and reliability of the topcoat depend not only on quality, these characteristics are influenced by the roof design, including the correct minimum slope. In this article, we will tell you how to choose the right angle of inclination of the ramp and check it for compliance with SNiP.

Roof slope is an important design parameter that denotes the angle formed by the floor plane and the roof slope. This indicator is expressed in percentage or degrees. It is calculated by dividing the ridge height by half the building width. The angle of inclination of the ramp depends on the technical and operational properties of the material and is regulated by SNiP and the manufacturer's instructions. Depends on it:

1. The possibility of using one or another type of roofing.
2. Construction, composition and cross-section of the rafter frame elements.
3. The ability of the roof to effectively remove rainfall.
4. The cost of roofing works.
5. Roof cake weight.

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

Calculation of the roof slope

Optimal values

Metal roofs are a 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, load-bearing capacity and method of installation of the roof covering.

• According to SNiP, the minimum angle of inclination of the roof made of metal tiles, if the length of the slope is 6 meters, must be at least 14 degrees.
• The permissible slope for a roof made of metal tiles is in the range of 14-45 degrees.
• The optimal angle of inclination, which ensures effective drainage of precipitation with a smaller area of ​​the slopes, should be 22 degrees.

The optimal angle of inclination for metal tiles

Roof design selection

Important! The minimum slope of a roof made of metal tiles, which manufacturers allow, is 11 degrees. Some grades of material can be installed even if the slope is 10 degrees. The decrease in this indicator allowed 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 tile roof. In addition to the requirements of SNiP and the manufacturer's recommendations, this indicator is influenced by other factors that must also be taken into account. When choosing the steepness of the slope, it is taken into account:

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

Features of roofs with a small slope

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

1. Increase the frequency of the battens and decrease the pitch between the rafters. To minimize the risk of roof collapse due to intense snow load, it is necessary to strengthen the rafter frame of the structure and mount frequent or solid sheathing.
2. Increase overlaps. Manufacturers recommend when installing metal tiles to make a horizontal overlap of 8 cm, and vertical overlap 10-15. To eliminate the likelihood of leakage in structures with gentle slopes, you can increase the overlap at the joints of the sheets.
3. Isolate joints. To prevent the penetration of melt and rain water between the joints of the sheets, you can treat the joints with silicone sealant, although this measure has a limited duration.

Step between rafters depending on the slope

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

Video instruction

The angle of inclination of any roof significantly affects its reliability and tightness. The minimum slope of the roof made of metal tiles, according to the requirements of SNiP, must be within the range of permissible values. Failure to comply with this rule can lead to a number of irreparable consequences. Metal roofing has a number of characteristic features associated, first of all, with the specificity of this material.

Roofing material

Metal tiles as a roofing material are very popular. It can be used to equip roofs with different geometric shapes. It does not put a lot of stress on the structure. Installation of metal tiles is absolutely not complicated and can be done by any roofer. The varied spectrum of colors of this material is very convenient for creating any design. When choosing it, it is imperative to take into account the slope of the roof.

The concept of slope and its calculation

The slope is directly the angle of inclination of the roof in relation to the horizon level. When carrying out roofing work is a fairly significant factor. The angle of inclination of any roof is calculated as follows. The calculation can be considered using the example of a right-angled triangle. For example: the width of the building is 10 meters, the height of the pediment in the ridge is 3 meters.

Side with - ½ width. Hence a = 3, c = 4. From the secondary school curriculum tg A = a / s. Total tg A = 0.75. We look at the table of tangents on the Internet. The angle is 37 degrees. In SNiP, the values ​​of the minimum angle of inclination of the roof are directly prescribed, taking into account the type of material and climatic conditions.

Taking into account the requirements of SNiP, the minimum roof slope, with a slope length of 6 meters, is 14 degrees.

What affects the choice of the slope angle

The slope of any roof is designed to prevent snow or rainwater from accumulating on the roof. There are no unified slope angles. Many factors affect the minimum slope. They must be taken into account when designing a structure. This is primarily:

• type of rafter system;
• climatic features;
• roof configuration;
• the purpose of the attic space;
• the exterior of the building;
• financial possibilities for roofing works.

The type of rafter system is chosen depending on whether the roof is gable or hipped. If the construction of a dwelling is not planned in the attic, then you should not lift the ridge part and directly increase the angle of inclination of the slope. When the attic space is designed for housing, the slope should be maximum.

Climatic factors

The angle of inclination of the slope is chosen, as a rule, taking into account the climatic conditions of the area where the construction is being carried out. Namely, depending on the amount of precipitation and wind speed in the area.

• The wind load is calculated based on the surface area of ​​the roof. In this case, it will be useful to foresee the strength of the wind and the possibility of cataclysms associated with it. A roof that is too steep will generally increase windage and may not be able to withstand high wind loads. Experts calculated that with a roof slope of 45 degrees, the wind force on it is 5 times higher than the wind load acting on the roof with a slope of 11 degrees. For the installation of such a roof, more material will be needed, which will undoubtedly hit the owner's pocket. If the slope is too slight, a gust of wind can blow away the roofing material.

• In winter, snow accumulates directly on the roof slopes. At a certain slope, it slides down. If it is small, then the roof will have to be cleaned to avoid damage to the rafter system. Taking into account SNiP, the projection of the roof must be performed with a mandatory margin of safety, in order to avoid possible deformation of the metal tile. The steeper the angle of the roof, the less opportunity for the snow layers to stay on it. But at the same time, the weight of the roof will be greater due to the increase in the amount of roofing material. With a large angle, the problem of installing a multi-tiered drainage system also arises. The difficulty is that there is a rather large roof section per unit length of the drain pipe. Since the water comes off very quickly, it is more difficult to find a pipe with the desired section. The only way out is to mount the drainage system in several tiers. And these are additional financial costs.

• A significant factor influencing the choice of the minimum slope angle of the slope is the quality of the house heating and its thermal insulation. If the roof insulation is of poor quality, then the snow on the slopes does not accumulate, since it will melt and slide down. However, with good thermal insulation, snow accumulations cannot be avoided.

The minimum slope requires the installation of additional waterproofing to prevent moisture penetration. For this, a layer of silicone sealant is applied to the joints.

Even in advance, when purchasing metal tiles, you should pay special attention to the recommendations of its manufacturer. Typically, he recommends designing a tilt angle of 12 degrees or more. There is a more durable material with the ability to mount and at an angle of 11 degrees. Such a metal tile is made with a smoother surface, which contributes to good sliding. If you do not take into account the manufacturer's recommendations and perform the roof with a lower slope angle, then as a result of heavy snowfall, there may be a risk of roof collapse. The minimum tilt angle is typical for regions with a warmer climate, where the amount of precipitation in the form of snow and rain is minimal. At the same time, the roof perfectly resists high wind loads.

This design is especially relevant for areas in which the number of sunny days per year reaches a maximum. Since the roof area with such a slope is less, then heating it in the summer creates less discomfort for the residents of this house. Moreover, with a smaller roof area, less metal will be consumed. And this is a pretty good option for saving your budget. Since there are no strict requirements in SNiP as to what the minimum slope of a metal roof should actually be, then it must be chosen according to the recommendations of the manufacturer of this material. As a rule, its value varies between 11 and 15 degrees. Its increase entails additional consumption of metal tiles. Excessive reduction requires additional waterproofing and the installation of additional reinforcement structures. Therefore, the optimal solution to this problem is the choice of the average value. We recommend watching a video on the topic:

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

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

Its basis is coiled steel coated with an aluzinc composition to resist the harmful effects of the environment. For increased resistance with a finishing layer on the metal additionally polymer coating applied... In this article, you will learn how to calculate the roof angle for metal tiles and what factors affect the roofing.

Advantages and disadvantages of metal tiles

Affordable price and improved performance characteristics allow the metal tile to occupy a leading position in the market for the sale of roofing materials.

The positive aspects of its application are:

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

Of the shortcomings, users and specialists most often note:

• increased noisiness during rain or hail;
• the need to use snow holders due to avalanche snow;
• a large number of fasteners directly affected by atmospheric precipitation;
• Requires an earthing device to prevent static build-up.

NOTE!

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

Roofing sheet composition

Qualitative indicators metal roofing in many ways depends on:

• the required minimum steel sheet thickness - not less than 0.4 mm... At a low 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 adversely affects metal thinner than the specified value;
• arising 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 ;
• the obligatory presence of an anti-condensation screen made of a waterproofing film. Need to know that a superdiffusion protective membrane cannot be used as such an anti-condensation material, since its use implies a more frequent and prolonged exposure to moisture on the inner surface of the sheet.

What factors affect the roof?

The main factors that negatively affect the 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

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

Special

• seismic impacts;

The correct calculation of all components when installing a rafter system guarantees the resistance of the metal roofing to the maximum permissible overloads.

Profiled metal sheets have sufficient rigidity, therefore, during installation, a continuous crate is not required. But when installing a rafter system, it is necessary to correctly calculate the step and angle of inclination of the rafter leg.

Roof inclination angle for metal tiles

Minimum angle metal roof slope is 10 degrees.

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

In choosing the optimal slope, it must be borne in mind 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 surface area occurs, 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 of the models of the corrugated surface of the metal tile will be selected for use. The characteristics of some manufacturers are initially laid down data on the minimum allowable slope;
• which design is meant - single-slope or dual-slope;
• possibility of snow removal after installing the roof.

Taking these conditions into account, without 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. a value of 22 degrees.

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

How to choose a roof angle for metal tiles?

How to calculate the optimal slope correctly?

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

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

For a pitched roof, the slope will be the value obtained from dividing the height of the structure by the distance of 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 the slopes as a percentage, the resulting figure is multiplied by 100.

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

In practice, there are options for roofing, the minimum slope for metal tiles is less than 10 degrees. Such exceptions are subject to special building recommendations.

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

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

Useful video

We suggest you watch a video tutorial on self-measuring the corner of the roof:

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

What is the slope, the optimal values ​​of the slope angle

Roof slope is an important defining structure formed by the angle cut by the floor plane and the roof slope. The indicator is expressed in percentage or degrees, calculated by dividing the height of the ridge by 1/2 of the width of the structure. The angle of inclination of the roof made of metal tiles is regulated by SNiP and the supplier's instructions. The indicator depends on factors such as:

1. Roof covering application.
2. The ability of the roof to effectively remove natural precipitation, withstand winds and other climatic phenomena.
3. The price of roofing works.
4. Mass of roofing cake.

A fairly new coating, metal tile, is not so strictly regulated by standards. Therefore, the manufacturer himself often advises the indicator of the minimum angle, based on the technical characteristics of the product. The calculation is based on the thickness of the sheet, the bearing capacity of the base and the method of laying out the roofing. However, there are optimal values ​​to rely on:

• With a slope of 6 meters in length, the minimum slope according to SNiP should be at least 14 °.
• The permissible slope of the roof made of metal tiles should be in the range of 14-45 °.
• The optimal value of the angle is 22 °, this indicator is sufficient for the normal drainage of precipitation with an area of ​​\ u200b \ u200bthe slopes of less than 6 meters.

The choice of the roof slope is not always simple, therefore, based on the SNiP indicators, one should take into account the following recommendations for the equipped slope steepness:

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

Advice! The calculation also takes into account the number of hurricanes, tornadoes and other natural disasters. Information is taken from reference books.

Features of metal roofs with a low slope

The lowest slope angle is 14 °, but experienced roofers also 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 steps are taken:

• The frequency of the battens in the crate is increased by reducing the inter-rafter pitch.
• The rafter system is reinforced by means of frequent or solid sheathing.
• Significantly increase the number of overlaps! Despite the manufacturer's recommendations for a horizontal overlap of 8 cm, 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.
• Seal the joints carefully with a silicone-based sealant.

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

Determination of the roof slope by geometric dimensions or in degrees

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

• I - the desired angle for metal tiles;
• H is the distance from the border of the overlap to the ridge, that is, the indicator of the height of the rafter structure;
• L - dimensions of the width of the building.

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

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

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

• 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 angle of inclination of the roof for metal tiles, you need to know that low steepness has its advantages:

1. economical consumption of materials;
2. reducing the weight of the roofing carpet, the index of 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 attachment points;
2. snow blockages on the roof will have to be removed more often so that the metal tile is not subjected to increased stress;
3. the need to equip a powerful lathing will require a miscalculation of the bearing capacity of the base and will complicate the fastening of roofing elements;
4. under a flat roof, it is not always possible to arrange spacious residential / non-residential premises.

But if the slope of the roof is large, for example 45 °, then, despite the free fall of the snow cover, the mass of the cover is increased, which is why the sheets simply slide off. The way out is the strengthening of the fasteners and strict adherence to the technology of installing the roofing carpet. In addition, when the angle of inclination of a metal roof is too steep, the consumption of roofing material increases, as in the arrangement of curly slopes.

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

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

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

Its basis is coiled steel coated with an aluzinc composition to resist the harmful effects of the environment. For increased resistance with a finishing layer on the metal additionally polymer coating applied... In this article, you will learn how to calculate the roof angle for metal tiles and what factors affect the roofing.

Affordable price and improved performance characteristics allow the metal tile to occupy a leading position in the market for the sale of roofing materials.

The positive aspects of its application are:

• a light weight - about 5 kg / m 2, as a consequence, there is no need to build a complex one;
• does not require special skills during installation;
• wear resistance;
• long service life;
• elegant and festive look, suitable for any design development.

Of the shortcomings, users and specialists most often note:

• increased noisiness during rain or hail;
• the need for use due to avalanche snow;
• a large number of fasteners directly affected by atmospheric precipitation;
• Requires an earthing device to prevent static build-up.

NOTE!

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

Roofing sheet composition

Qualitative indicators metal roofing in many ways depends on:

• the required minimum steel sheet thickness - not less than 0.4 mm... At a low 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 adversely affects metal thinner than the specified value;
• arising 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 a more frequent and prolonged exposure to moisture on the inner surface of the sheet.

What factors affect the roof?

The main factors that negatively affect the 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

• 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 provide the resistance of the metal roofing to the maximum permissible overloads.

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

Roof inclination angle for metal tiles

Minimum angle metal roof slope is 10 degrees.

Permissible slope metal roof can be values in the range from 10 o to 90 o.

In choosing the optimal slope, it must be borne in mind 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 surface area occurs, 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 of the models of the corrugated surface of the metal tile will be selected for use. The characteristics of some manufacturers are initially laid down data on the minimum allowable slope;
• what design is meant - single-slope or dual-slope;
• possibility of snow removal after .

Taking these conditions into account, without 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. a value of 22 degrees.

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

How to choose a roof angle for metal tiles?

How to calculate the optimal slope correctly?

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

• the height of the 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 from dividing the height of the structure by the distance of 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 the slopes as a percentage, the resulting figure is multiplied by 100.

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

In practice, there are options for roofing, the minimum slope for metal tiles is less than 10 degrees. Such exceptions are subject to special building recommendations.

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

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

Useful video

We suggest you watch a video tutorial on self-measuring the corner of the roof:

Metal tiles are one of the most popular roofing materials due to their lightness and ease of installation. The only difficulty faced by developers is the question of what is the minimum slope of a metal roofing tile allowed during construction. The optimal angle of inclination is determined at the design stage, taking into account all the factors, which we will talk about below.

What determines the amount of slope

In order to correctly calculate the slope of the roof, it is necessary to take into account several factors that determine this value:

• snow masses;
• wind;
• roof insulation.

Snow load is the level of snow that will accumulate on your roof without sliding down under the weight of its weight.... It is very important at the design stage to find out what the level of snowfall in a given region is in order to make all the calculations correctly and to prevent possible deformation of the roof under the weight of snow.

Pitched roof construction types

In addition, the presence of heating pipes and thermal insulation of both the roof and the house itself affects the minimum angle of inclination of a metal-tile roof.... Very often you can find such a picture when two adjacent houses with the same roof slope have different levels of snow masses on the roof. If you look closely, then the house with the least amount of snow necessarily has heating or heating pipes, the heat of which heats it up.

Nevertheless, if the roof insulation is strengthened, the snow will melt much worse, because the roof will no longer give off heat that melts the snow masses. That is why calculations are made simultaneously with the choice of insulation.

Roof shape and rainfall

The angle of inclination of the roof is influenced by many factors, including the shape of the roof and the level of precipitation. The minimum slope of metal roofing is only 14 degrees.... However, this value is considered appropriate only for ideal operating conditions: in mild warm climates, without precipitation in the form of snow or rain.

If a single-pitched roof structure is planned, the optimal slope of the elements is 30 degrees. If the roof is built with two slopes, it is worth making a slope of 40-45 degrees.

As already mentioned, the amount of precipitation has a direct impact on the choice of the minimum angle of inclination of the metal-tile roof. For example, if it is less than 22-25 degrees, then sooner or later moisture will begin to get directly into the roof joints. In addition, a small slope will not allow the snow masses to freely roll off the roof slope, they will lie as a dead weight on the roof, ramming and gradually deforming it.

On the other hand, an angle of 25 degrees is ideal for windy, windy areas, as the level of blowing will be minimal.

A small angle of inclination in private construction is extremely rare.... The optimal operating conditions for a house with a small slope of the roof is a warm mild climate, where sunny days prevail, because the heating of such roofs comes mainly from solar energy. Thus, our area is not very suitable for such a construction.

The angle of inclination, practiced in domestic construction, is much larger than the minimum, i.e. 14 degrees. The main task is to find the optimal value for a particular roof, so to speak, the golden mean between a good level of resistance to both precipitation and winds.

How to choose the optimal size

The greater the angle of inclination of the structure, the larger and its entire area, i.e. the windage of the metal-tile roof increases, and the snow will roll straight down, without lingering on it.

Snow does not roll off the roof

Naturally, the larger the total area of ​​the tile covering, the greater the material consumption. Thus, a roof with a large slope is much more expensive.

That is why most developers do not immediately strive to make the greatest slope, but try to find the minimum acceptable slope angle, which will allow them to significantly save money.

In addition, the overall strength of a metal roofing structure can be increased not only by reducing the angle of inclination, but also through the use of frequent lathing.

The lathing with a minimum distance between the elements will create a kind of shock-absorbing cushion and increase the strength of the internal roof structure.

Thus, if your region has the most unfavorable conditions, implying a large amount of snowfall, then it is better to strengthen the crate and make the slope more. Well, if there is little precipitation in the region, however, there are very strong gusts of wind, it is pointless to make the maximum slope, because it will be subjected to a huge wind load and may not withstand. It is best to choose an average value.