Determining the slope of a metal tile roof. Minimum slope of a hip roof. What is the minimum slope angle of a metal tile roof? The slope of a metal tile roof

The minimum angle of inclination of metal tile roofs is one of the most important parameters, which should be taken into account when developing a project rafter system It's a must at home. A reliable and durable roof will only be achieved if the standards recommended by the manufacturer are followed.

Why the roof should not be too flat

There is a direct relationship between the final cost of the roof and the angle of its inclination. The flatter the slopes, the less material is spent on the installation of the rafter system and assembly 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 permissible values, the roofing may simply not withstand it. In addition, very flat 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 underneath them.

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Minimum permissible and optimal slope for metal tiles

Since roofing sheets of this type are made from high-quality steel, they can withstand quite serious loads. However, their relief texture contributes to detention in winter period there is a lot of snow on the roof. And therefore, it is still not recommended to make slopes under this material, as well as under any other, too flat, despite its strength.

Minimum slope metal roofing – 12º. But most manufacturers still advise installing rafters under sheets of this type at an angle of at least 14º. There are also special brands of metal tiles on the market, which can be installed on very gentle slopes - only 11º. But this coating option is rarely found on sale. In any case, when purchasing metal tiles of one brand or another, you should carefully study its technical data sheet. The permissible slope must be indicated there.

Roofs with a slope of 12º are made quite rarely. Most often, the angle of inclination of the roof slopes country house, covered with metal tiles, is 34-35º. This is the best and actually very convenient option. With such a slope, not too much material is wasted, and the roof itself looks harmonious and impressive. In addition, this is the easiest angle to make with a standard length of lumber of 6 m. A roof steeper than 35º should be assembled only if it is broken and it is intended to be built underneath residential attic. The optimal angle for layered rafters of such roofs is 40-45º.

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Design features of the rafter system

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

When assembling it, consider the following:

The recommended spacing between rafters for metal tiles is 60-90 cm.
For the rafters themselves, you should take timber with a cross-section of at least 50x150 mm.
The lathing is made of thick boards 30x100 mm.
The pitch of the roof sheathing for metal tiles directly depends on the size of the segments of the sheets 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 using electric scissors, but in no case with a grinder.
You should walk on already installed sheets in soft shoes, stepping between the waves.
The sheets are mounted using special self-tapping screws with rubber gaskets. These fasteners do not tighten too tightly.
Screws are screwed in when attaching sheets to the sheathing exclusively under the wave.

When covering rafters longer than 6 m, metal tiles are installed in rows along the height. The width of the horizontal overlap is determined depending on the angle of inclination of the slope. The higher the roof, the more water is retained on it during rain and the more airtight the joints must be. Therefore, if the angle of inclination of the roof rafters is 12-14º, the metal tiles are laid with an overlap of at least two waves. If this indicator is 14-35º, it is allowed to carry out installation with overlapping sheets of the upper row on one wave of the lower one.

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What materials and tools will you need?

Since the metal tile material is cold and also noisy during rain, the roof sheathed with it is usually insulated. At the same time, polystyrene foam is more 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 covering 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 counter-lattice;
boards for sheathing.

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

Tools you will need:

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

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Assembling an insulating pie

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

From the attic side it is attached to the rafters vapor barrier material. You can fix it using a construction stapler.
A heat insulator is installed. It should be installed between the rafters. In order to place a support under the mineral wool, from the attic side on top vapor barrier film boards are stuffed or steel wire is fastened in a zigzag manner.
Mounted on top of the insulation waterproofing material. It must be secured in a horizontal direction with a sag of approximately 2 cm. Otherwise, when the roof frame moves, the film may tear. Fix the membrane to the rafters with bars.
The chimney is waterproofed. The film is placed on it and glued with mastic.
Install the sheathing. It should be nailed onto the bars using galvanized nails. In the areas where the valleys are located and near the chimney, the sheathing must be made continuous.

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

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

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

A fairly new coating, metal tiles, is not so strictly regulated by standards. Therefore, the manufacturer himself often recommends the minimum angle indicator, based on the technical characteristics of the product. The calculation is made based on the thickness of the sheet, the load-bearing capacity of the base and the method of laying out the roofing. However, there are optimal values that you should rely on:

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

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

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

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

Features of low-slope metal tile roofs

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

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

Advice! All measures taken are temporary, therefore visual inspection once a year won't hurt the roof.

Determining the roof slope by geometric dimensions or in degrees

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

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

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

degrees	%	degrees	%	degrees	%
1	1,7	16	28,7	31	60,0
2	3,5	17	30,5	32	62,4
3	5,2	18	32,5	33	64,9
4	7,0	19	34,4	34	67,4
5	8,7	20	36,4	35	70,0
6	10,5	21	38,4	36	72,6
7	12,3	22	40,4	37	75,4
8	14,1	23	42,4	38	78,9
9	15,8	24	44,5	39	80,9
10	17,6	25	46,6	40	83,9
11	19,3	26	48,7	41	86,0
12	21,1	27	50,9	42	90,0
13	23,0	28	53,1	43	93,0
14	24,9	29	55,4	44	96,5
15	26,8	30	57,7	45	100

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

The optimal angle for a roof with complex structural elements is taken into account by the correction factor for 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 roof angle for metal tiles, you need to know that low slope has its advantages:

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

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

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

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

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

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 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 - multiplied by 100. Visually: we divide the width of 20 m and the height of 5 m and get 0.5, multiply by 100 and get 50%.

On minimum angle the slope is influenced by the climatic conditions of the area. A slope of 30 degrees is used in regions with heavy precipitation. In arid areas, roofs are built with a slope of 10-25 degrees.

The building material – metal tiles – is used in the construction of buildings of various complexities. An exception is that the minimum angle of inclination for metal tiles is 14 degrees, no less. This slope is able to withstand strong gusts of wind, unlike snow, which does not have the ability to roll down such a small slope.

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

Some tips for setting and coordinating the minimum roof pitch

Layers of metal tiles should be laid on a perfectly flat surface; the row height cannot be more than one meter
When handling layers, you should wear construction gloves that protect your hands from damage.
You need to hold the layer by the edges
Securely fasten metal tiles to the sheathing with construction screws
Walk on a roof made of metal tiles in special soft shoes that do not damage the surface of the roof, do not step on the waves of the tiles
Cutting metal tiles should be carried out according to a preliminary scheme, measuring required sizes sheets

Preliminary processes:

The rafter system must be completely ready. We measure the slopes
Existing triangular errors are eliminated with additional parts
It is recommended to get rid of moisture between the metal tile and the insulating layer using lathing (height 0.4 centimeters)
Leave gaps of 0.5 centimeters in the sheathing of the eaves
We lay waterproofing on the rafter boards. From the edge cornice boards the waterproofing should have a sagging of 0.2 centimeters. We lay the waterproofing joints with an overlap of 15 cm.
We insulate roofs with special slabs. We lay them between the rafters
Apply the next layer - vapor barrier

Detailed information on the video in the next tab.

Installation of sheathing

Lathing is an important element of the roof. It is installed on the rafter system. Consists of identical boards. They are pre-treated with an antiseptic solution. The distance between the boards lying on the edge of the cornice is 30-35 centimeters, subsequent ones - 35-40 centimeters. The metal tiles are attached to the sheathing at the troughs of the waves.

A drainpipe is screwed to the eaves board to ensure uniform drainage of rainwater. The cornice is installed at the edge of the metal tile roof using flat head screws. The match is constructed with an average overlap of 7 centimeters. Solid sheathing is used near the chimney. The valley is installed in the internal joints of the roof (overlap - 10-15 centimeters).

Additions for installing the roof and arranging its minimum slope

Roof installation includes complex process, and it is simply impossible to avoid important nuances:

You cannot install metal tiles in the upper bend of the wave.
Self-tapping screws are not too tight to screw in
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; they create the angle. For details on installing the roof and setting its minimum angle, see the video in the next tab.

Tile is a roofing material made of baked clay, plastic or metal.

Metal tiles are 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 an old roof. To do this, you do not need to remove used materials - on the contrary, they will serve as additional waterproofing. For proper installation, calculate the minimum slope of a metal tile roof.

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

What is slope?

Many people wonder what a bias is. Slope is 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 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 it as a percentage, multiply by 100: 0.8*100=80%.

The installation instructions will be incomplete without some rules. It is strictly prohibited:

attach metal tiles to the upper deflection of the wave;
over-tighten the screws;
use a hammer;
use nails and screws without sealing 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 should only be removed with a soft brush. To protect the sheet from corrosion, it is necessary to immediately paint over all scratches found during installation with special paint. Three months after the start of operation, it is necessary to tighten all fastening screws.

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

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

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

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

How to determine the roof pitch in your area

To calculate the strength of the roof structure and the amount of material required, you need to know the optimal one. It is necessary to take into account a number of circumstances, including:

projected number of slopes;
used under-roof space;
Efficiency indicators;
weight of the structure.

It would seem that the steeper the slope, the better, but this leads to increased 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 metal tile roof.

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

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

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

What is the minimum slope and how to determine it

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

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

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

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

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

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

Why the roof should not be too flat
Minimum permissible and optimal slope for metal tiles
Design features of the rafter system
Installation of metal roofing
- What materials and tools will you need?
- Assembling an insulating pie
- Installation of metal tiles

The minimum angle of inclination of metal tile roofs is one of the most important parameters, which must be taken into account when developing a project for the rafter system of a house. A reliable and durable roof will only be achieved if the standards recommended by the manufacturer are followed.

Why the roof should not be too flat

There is a direct relationship between the final cost of the roof and the angle of its inclination. The flatter the slopes, the less material is spent on constructing the rafter system and assembling 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 permissible values, the roofing may simply not withstand it. In addition, very flat 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 underneath them.

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

Minimum angle of inclination of a metal roof

Parameter	Brief comparative characteristics
	The weight of metal sheets ranges from 5–7 kg/m2, the variation is associated with different thicknesses. The corrugated sheeting has the same mass; the differences between both roofs are only in the profile geometry. Only roll coverings weigh less, but they have limited areas of use. All other roofing materials weigh much more. Eg, square meter ordinary slate can weigh more than 30 kg. Coating weight – important technical parameter, the rafter system depends on it; sometimes the weight of the roof must be taken into account when calculating the foundation of a building.
Installation manufacturability	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 special hand tools. The disadvantage is a significant amount of metal tile waste when covering complex pitched roofs.
Operating time	If the material is manufactured by responsible manufacturers, the thickness and quality of the zinc layer is precisely maintained, and innovative materials are used to finish the outer layers. polymer coatings, 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 lot of unscrupulous people. 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 conditional. Color palette very wide, from natural to blue and other very original colors. This, on the one hand, increases design possibilities architects, and on the other hand, makes even more noticeable the already large difference in the appearance of metal and natural tiles. The presence of the word “tile” in the product name is a 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. In terms of average cost, metal tiles are cheaper only than piece roofing; other roofing materials have a lower price. In fact, you should take into account not only the cost of materials, but also the financial costs of their installation. With such a comprehensive comparison, metal tiles are second only to metal profiles.

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

Why is the angle of inclination of metal tiles important?

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

Rafter load calculator

How is the slope of a metal tile roof determined?

Previously, the slope was determined only in degrees; all builders understood this value and they could imagine the appearance of the roof without a drawing. Recently, another definition of the slope value has been introduced into building codes - as a percentage; there has become more confusion, and few people know what the changes are related to. If roofers easily understand how roof slopes are located at an angle of 30°, then few of them can draw a rough sketch of a roof with a slope of 57.7%. Although it's the same 30°.

Slope calculation algorithm

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

I% = H×0.5L×100, where

I – slope of the roof slope as a percentage. The lower the percentage, the smaller the slope; an angle of 1° equals a slope of 1.8%, and an angle of 45° equals a slope of 100%.
H – Height of the rafter system. The height of the ridge or ridge run is measured.
L – width of the rafter 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 a gable roof the slope is 1: 0.5 × 10 × 100 = 20%.

This formula is used for gable roofing systems. In our case, it requires adjustment. The fact is that there are no gable roofs with a minimum angle of inclination; these are only options for single-pitch rafter systems. This means that there is no need 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 example considered above, 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, you need to use special tables or geometric formulas. If one of the sides of a right triangle is known, then the percentage of slope allows you to calculate the second leg, then the angle is calculated using trigonometric formulas, and only after that the length of the hypotenuse of the right triangle is calculated. The length of the slope is the main parameter when designing a rafter system and determining the amount of materials for roof covering. Without this value it is impossible to buy the required amount of metal tiles, choose best option roofing covering, decide on architectural style building.

In degrees, the angle of inclination is determined much more simply; all existing construction tools in their work use the principle of an ordinary school protractor.

Calculator for calculating the length of rafter legs

What is the minimum tilt angle

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

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

How does the angle of inclination affect the performance of a roof?

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

Benefits of a large tilt angle

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 inclination? The simplest and most correct answer is that natural tiles are laid only on slopes with a slope of at least 30°; accordingly, their metal imitation will look flat roofs ah very strange.

How to determine the angle of inclination

In addition, a large angle provides the following advantages.

The likelihood of moisture getting between the sheets of coating is reduced. This problem has already been discussed in more detail above, and with increasing angle of inclination the situation improves much.
The load on all elements of the rafter system in winter is significantly reduced. The higher the slope, the thinner the snow on the roof. But as this parameter increases, the roof windage increases at the same time; this should be kept in mind when designing the rafter system. Moreover, the forces from the wind act not vertically, but horizontally, which requires special construction measures to increase stability load-bearing structures in the horizontal direction.
The high height of the roof ridge allows developers to significantly expand the use options attic spaces. In many cases, they can be converted into residential ones - the living space of the house increases with minimal financial expenses.

Example 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 rafter system becomes more complicated, the actual consumption of all building materials, including roofing, increases.
Problems arise during the operation of the roof. It is often necessary to install additional utilities on the roof, perform renovation work etc. The greater the slope, the more difficult it is for the craftsmen, the more complex the safety devices.
Wind load increases. It is necessary to change the design of the rafter system.
There is a need to install snow guards. Snow does not fall off flat roofs like an avalanche; there is no need to install special snow guards. Experienced builders know that every extra hole in roofing materials reduces the reliability of the coating.

Snow guards are required on roofs with a large inclination angle.

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

What factors should you keep in mind when choosing an incline?

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

Important. When choosing the parameters of a rafter system, you cannot only take into account 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 roof elements.

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

During design flat roofs with minimal tilting, the architects take all measures to increase the stability of the structure. From many existing options To solve the problem, those that require minimal financial investment are selected.

Reduce the pitch of the rafter legs

This allows the use of ordinary boards with a thickness of no 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 rafter system from thick lumber.

Rafters from edged boards

Use additional stops

Not all rafter systems allow the use of this method, but whenever possible, 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 lumber holds them perfectly. The boards have low resistance to bending and work very well against compression.

Rafters on supports

Reliably seal joints

Flat roofs are pitched and have no valleys; this greatly simplifies the construction process and reduces the likelihood of leaks. But such structures have their own problems - a high probability of sheets of metal tiles being undermined by gusts of wind. This is explained by the fact that the significant speed of movement air masses along the coating plane creates a vacuum above it. Accordingly, significant forces appear that tear the sheets off the sheathing. Self-tapping screws for fixing metal tiles have rubber gaskets to seal the holes. If they are often compressed/uncompressed, microcracks form due to material fatigue. In the future, they increase in size and can cause water leaks.

Self-tapping screws for metal tiles

Leaks are more dangerous for flat roofs than for pitched roofs for two reasons.

The first is small attic space flat roof makes periodic monitoring of its condition much more difficult; leaks are often discovered only after Negative consequences noticeable in interior spaces. Delayed elimination of problems significantly increases the cost of repair work.
Second - natural ventilation the under-roof space of flat roofs is much worse than that of pitched roofs. As a result, moisture evaporation takes longer wooden structures wet, which accelerates the development of putrefactive processes.

Flat roof house

Reduce the pitch between screws

Manufacturers recommend screwing screws in a staggered pattern through the wave. But this recommendation is justified pitched roofs with an inclination angle of at least 20°. For flat roofs, professional craftsmen advise reducing the distance between hardware. This is done in order to increase the reliability of fixing sheets of metal tiles and eliminate the possibility of them being blown away by the wind.

Conclusion

The more carefully you approach the choice of the slope of a metal roof, the fewer problems will arise during the operation of the building. We must remember 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 finishing of walls and ceilings interior spaces, then you will have to lose very large financial resources.

Errors during the construction of a rafter system are not only expensive, they have an extremely negative impact on the service life of buildings, you must 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 eliminating construction errors.

Video - How to measure the angle of a slope

The foundation and roof are the two most important and difficult to calculate architectural element any building. The load-bearing elements of the roof are the rafter system, and its performance largely depends on the angle of inclination of the slopes. Ordinary developers choose the optimal roof angle based on different criteria than designers. 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 improved 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 rafter system;
does not require special installation skills;
wear resistance;
long service life;
elegant and festive look, suitable for any design development.

Among the shortcomings, users and experts most often note:

increased noise during rain or hail;
the need to use snow retainers due to avalanche-like snowfall;
a large number of fastening elements those under direct influence of precipitation;
A grounding device is required to protect against the build-up of static electricity.

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

Roofing sheet composition

The quality indicators of metal tile roofs largely depend on:

required minimum thickness steel sheet– 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 metal thinner than the specified value;
emerging 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 using a grinder, treat the cutting area with a protective compound;
mandatory presence of an anti-condensation screen made of waterproofing film. You 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. inner surface leaf.

Roof angle for metal tiles

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

The permissible slope of a metal tile roof can range from 10° to 90°.

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

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

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

which model of corrugated metal tile surface will be chosen for use. The characteristics of some manufacturers initially contain data on the minimum permissible slope;
what kind of construction is meant - single-slope or double-slope;
Possibility of removing snow after installing the roof.

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

This figure is not found in technical documents on roof construction; it was obtained experimentally as a result of observations of the metal-tiled surface in use.

How to choose a roof angle for metal tiles?

How to correctly calculate the optimal slope?

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

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

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

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

In practice, there are options for installing roofs; the minimum slope for metal tiles is less than 10 degrees. Specific construction guidelines apply to such exceptions.

The pitch of metal tiles 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 the installation of a continuous sheathing. If all standards are observed, a waterproofing carpet is laid on it. When laying sheets under transverse and longitudinal joints, special gaskets are installed.

>Useful video

We invite you to watch a video tutorial on how to measure the roof angle yourself:

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. Durability and reliability finishing coating depend not only on quality, these characteristics are influenced by the roof design, 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 slope?

The roof slope is an important design parameter, which indicates the angle formed by the floor plane 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. It depends on:

Possibility of using one or another type of roofing covering.
Design, composition and cross-section of rafter frame elements.
The ability of a roof to effectively drain precipitation.
Cost of roofing work.
Weight of the roofing pie.

Note! If the slope of a metal tile roof is increased from 22 degrees to 45 degrees, the area of the slope will increase by 20%, which will affect the cost of materials (finish coating, 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.

Calculation of roof slope

Optimal values

Metal roofs are relatively new constructive solution, therefore, the technology of its installation and operation is not clearly regulated by SNiP. Information on 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 laying the roofing.

According to SNiP, the minimum angle of inclination of a metal tile roof, if the length of the slope is 6 meters, 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 effective removal of precipitation with less impact on the slopes, should be 22 degrees.

Optimal tilt angle for metal tiles

Choosing a roof design

Important! The minimum slope of a metal tile roof allowed by manufacturers is 11 degrees. Some brands of material can be laid even if the slope is 10 degrees steep. A reduction in this indicator was achieved by the use of new, smoother polymers and more durable steel for the production of roofing.

Slope selection

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

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

Features of roofs with a small slope

The minimum recommended pitch for a metal roof is 14 degrees, however experienced craftsmen can efficiently lay this type of roofing material, even if the slope of the slopes is within 10-14 degrees. To increase the reliability of such a design and reduce the risk of leaks, the following measures must be taken:

Increase the frequency of the sheathing slats 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 rafter frame of the structure and install frequent or continuous sheathing.
Increase overlaps. Manufacturers recommend when installing metal tiles to make a horizontal overlap of 8 cm, and a vertical overlap 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.
Insulate joints. To prevent the penetration of melt and rain water between the joints of the sheets, you can treat the seams silicone sealant, although this measure has a limited duration.

The pitch between the rafters depending on the slope

Experienced craftsmen claim that the easiest way to make a roof made of metal profiles reliable is to follow the manufacturers’ recommendations and strictly adhere to the recommended angle of inclination.

Minimum slope of a hip roof. What is the minimum pitch angle for a metal tile roof?

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

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

Some tips for setting and coordinating the minimum roof pitch

Layers of metal tiles should be laid on a perfectly flat surface; the row height cannot be more than one meter
When handling layers, you should wear construction gloves that protect your hands from damage.
You need to hold the layer by the edges
Securely fasten metal tiles to the sheathing with construction screws
Walk on a roof made of metal tiles in special soft shoes that do not damage the surface of the roof, do not step on the waves of the tiles
Cutting metal tiles should be carried out according to a preliminary scheme, measuring the required sheet sizes

Preliminary processes:

The rafter system must be completely ready. We measure the slopes
Existing triangular errors are eliminated with additional parts
It is recommended to get rid of moisture between the metal tile and the insulating layer using lathing (height 0.4 centimeters)
Leave gaps of 0.5 centimeters in the sheathing of the eaves
We lay waterproofing on the rafter boards. The waterproofing should sag 0.2 centimeters from the edge of the eaves board. We lay the waterproofing joints with an overlap of 15 cm.
We insulate roofs with special slabs. We lay them between the rafters
Apply the next layer - vapor barrier

Detailed information on the video in the next tab.

Additions for installing the roof and arranging its minimum slope

Roof installation involves a complex process, and avoid important nuances It's simply impossible:

You cannot install metal tiles in the upper bend of the wave.
Self-tapping screws are not too tight to screw in
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; they create the angle. For details on installing the roof and setting its minimum angle, see the video in the next tab.

Tile is a roofing material made of baked clay, plastic or metal.

Metal tiles are considered one of the most reliable and durable materials, due to their 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 used materials - on the contrary, they will serve as additional waterproofing. For correct installation calculate the minimum slope of a metal tile roof.

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

The installation instructions will be incomplete without some rules. It is strictly prohibited:

attach metal tiles to the upper deflection of the wave;
over-tighten the screws;
use a hammer;
use nails and screws without sealing gaskets;
use polyurethane foam as ridge and valley seals;
use an angle grinder such as a grinder.

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

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

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

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

How to determine the roof pitch in your area

To calculate the strength of the roof structure and the amount of material required, you need to know the optimal one. It is necessary to take into account a number of circumstances, including:

projected number of slopes;
used under-roof space;
Efficiency indicators;
weight of the structure.

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

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

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

What is the minimum slope and how to determine it

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

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

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

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

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

When choosing the type of roof, each person’s taste preferences play a decisive role. Everyone wants to build a house so that it is beautiful, comfortable and lasts for many years. The roof crowns the building and 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, it needs to be properly designed and built correctly. And to save money, you need to choose the correct slope of this roof for metal tiles, taking into account the climatic conditions of your region.

Why the roof should not be too flat
Minimum permissible and optimal slope for metal tiles
Design features of the rafter system
- What materials and tools will you need?
- Assembling an insulating pie
- Installation of metal tiles

The minimum angle of inclination of metal tile roofs is one of the most important parameters that must be taken into account when developing a project for the rafter system of a house. A reliable and durable roof will only be achieved if the standards recommended by the manufacturer are followed.

Minimum permissible and optimal slope for metal tiles

Since roofing sheets of this type are made from high-quality steel, they can withstand quite serious loads. However, their relief texture helps to retain a large amount of snow on the roof in winter. And therefore, it is still not recommended to make slopes under this material, as well as under any other, too flat, despite its strength.

The minimum slope of a metal tile roof is 12º. But most manufacturers still advise installing rafters under sheets of this type at an angle of at least 14º. There are also special brands of metal tiles on the market, which can be installed on very flat slopes - only 11º. But this coating option is rarely found on sale. In any case, when purchasing metal tiles of one brand or another, you should carefully study its technical data sheet. The permissible slope must be indicated there.

Roofs with a slope of 12º are made 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, not too much material is wasted, and the roof itself looks harmonious and impressive. In addition, this is the easiest angle to make with a standard lumber length of 6 m. A roof steeper than 35º should only be assembled if it is broken and a residential attic is intended to be built underneath it. The optimal angle for layered rafters of such roofs is 40-45º.

Installation of metal roofing

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

Sheets are cut using electric scissors, but in no case with a grinder.
You should walk on already installed sheets in soft shoes, stepping between the waves.
The sheets are mounted using special self-tapping screws with rubber gaskets. These fasteners do not tighten too tightly.
Screws are screwed in when attaching sheets to the sheathing exclusively under the wave.

What materials and tools will you need?

Since the metal tile material is cold and also noisy during rain, the roof sheathed with it is usually insulated. At the same time, mineral wool, rather than polystyrene foam, is 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 covering 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 counter-lattice;
boards for sheathing.

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

Tools you will need:

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

Assembling an insulating pie

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

On the attic side, a vapor barrier material is attached to the rafters. You can fix it using a construction stapler.
A heat insulator is installed. It should be installed between the rafters. In order to provide a support for the mineral wool, boards are placed on top of the vapor barrier film from the attic side or steel wire is fastened in a zigzag manner.
A waterproofing material is installed on top of the insulation. It must be secured in a horizontal direction with a sag of approximately 2 cm. Otherwise, when the roof frame moves, the film may tear. Fix the membrane to the rafters with bars.

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

How long a house will last and how long its roof will last depends directly on what kind of roofing material will be used. Naturally, it is also important how the building will look externally, as well as how environmentally friendly the roof will be. Nowadays, metal tiles have become the most popular material. It has high resistance to impact external environment, intensive loads, and also has good bearing capacity. Naturally, in addition to this, for long-term service, you need to correctly select the minimum angle of inclination of the metal roof. The article describes which optimal parameters to use for this characteristic.

Source dom.germanovich.com

What are the advantages of metal tiles

This material has a number of advantages:

Metal tiles light in weight. There are from five to seven kilograms per square meter. It is used to cover the roof, which has complex design. Thanks to its lightness, there is no need to reinforce the rafters. This roof does not load the walls and foundation.

Due to the ease of installation of roofing material and the absence of the need for special tools, cost of work installation is relatively low.

This roofing material has wide color palette, so you can choose any of them to suit the overall tone of the building.

The tiles are made from thin sheets of steel, the thickness of which is from 0.4 to 0.7 millimeters. Thanks to her profile, she is able withstand heavy loads.

Anti-corrosion sheet roofing material protected galvanized and a polymer protective layer applied to the surface.

The main advantages of the material are durability, low cost and aesthetic appearance.

What is slope

The roof slope is the angle formed between the roofing material and the ceiling.

Source stroim-dom.net

In documents it is indicated as a percentage or degrees. It is calculated by mathematically dividing the distance from the highest point at the intersection of the rafters, which is called the ridge, by one-half of the entire width of the building. The slope of the roof depends on:

what material the building will be covered;

design frame roof and its main parts;

as far as the roof can resist atmospheric phenomena;

price works of master roofers;

weight all layers used.

On a note! If the slope of a metal roof is changed from 22 to 45 degrees, the slope will increase by 20%. And this will significantly affect the cost of roofing materials, as well as the weight of the entire structure. In this case, the slope must be determined during the design of the entire building in order to have an idea of the load on the foundation.

What does the slope of the roof depend on?

For those people who do not understand construction at all, it is very difficult to determine exactly what the minimum roof slope should be. Here you need to take into account natural factors that constantly affect the roof. These include:

Snow layer, which will fall in winter. If the slope is greater, the snow will slide off on its own.

Source ko.decorexpro.com

On our website you can find contacts of construction companies that offer services roof design and repair. You can communicate directly with representatives by visiting the “Low-Rise Country” exhibition of houses.

Ability wind resistance. In regions where winds constantly blow, you need to keep the slope minimal so that gusts of wind glide over the roof and do not create a sail effect.

Since this material for covering a building is very light, sparse lathing is allowed, but when installing rafters, you must strictly adhere to the distance and angle at which they will be installed.

How many degrees should the minimum angle have?

The minimum slope of a metal tile roof is 10 degrees. A slope is allowed that ranges from 10 to 90 degrees. When choosing the optimal slope angle, you need to take into account that at a small degree the space between the roof and the ceiling cannot be used for any economic purposes.

If the largest roof angle is set for metal tiles, then go out onto the roof in order to carry out technical work, it will be very difficult. Moreover, the larger the angle, the higher the ridge is located and, accordingly, the area that needs to be covered increases.

Thus, more roofing materials will be needed, and this will affect the budget. In addition, payments for roofing work will also increase Source bankfs.ru

When correctly calculating the roof slope angle for metal tiles, the calculator must take into account the following aspects:

Roof tile model. It should be noted that most manufacturers indicate the minimum slope of a metal tile roof in the product description.

Which roof view Planned: single or double slope.

How will it be clear the snow from the roof.

Having carried out all the calculations and taking into account the above points, provided that the length of the slope surface is 6 m.p., the minimum slope is set at 22 degrees. Naturally, this result is not indicated in the technical documentation. It is calculated by experienced craftsmen in the process of observing roofs already in use.

Carrying out calculations

To determine more accurately what the minimum slope of a gable roof made of metal tiles should be, you need to know two numbers:

height from the top of the parapet to the ridge;

width building.

To make the calculation, the distance from the parapet to the ridge is divided by the value of half the wall and the result is the desired angle.

Source builld.ru

To determine the result as a percentage, the resulting number must be multiplied by 100.

Important! In order for the result to be accurate, you need to measure the distance to the ridge not from the surface of the ceiling, since this is a gross mistake, but from the top of the parapet.

Naturally, there are exceptions in construction when the slope is only 10 degrees. But this is done in the case of special construction recommendations. It should be taken into account that with such a slope an increased load is created on the surface when snow falls. This way the sheathing is made continuous. In addition, a waterproofing carpet must be laid on it. The same under the butt sides roofing sheets special gaskets are placed.

Video description

In the video you can see the low angle of the roof:

Conclusion

It is best, when working with metal tiles, to know the instructions from the manufacturers and follow them all unquestioningly. In addition, we must remember that experience cannot be replaced by anything, therefore, everything installation work It's better to trust the professionals. Turning to a reliable construction company, you get speed of work and a documented guarantee.