Consumption of roofing screws per 1 m2 of corrugated sheet. Scheme for fastening corrugated sheets with self-tapping screws on the roof

Inexperienced people may have a number of questions: how to fasten, what is the consumption of self-tapping screws per 1 m2, how to choose them correctly. We will try to answer these questions.

The consumption of self-tapping screws depends on the tasks assigned to you, and as you know, profiled sheets are used to perform various tasks. For example, it is used for roofing, for finishing the facade of a building, as a barrier element and for other purposes. In all of the above options, the consumption of screws for corrugated sheeting will not be the same.

Climatic conditions also affect consumption. In areas with high winds, heavy precipitation, more reliable fastening material, therefore, the number of fasteners will increase. If you live in such areas, then you cannot avoid attaching screws to the bottom of each wave.

It is difficult for the average person to understand how many screws per corrugated sheet will be used for fastening roofing material. Let's try to cover this topic in more detail.

Contents

How many self-tapping screws for attaching corrugated sheets are needed for a roof?

Installation of profiled material begins from the side of the canopy, which is a continuation of the roof. We have already talked about fastening, read about it. The first sheet is installed in the outer row, the adjacent sheet is installed with an overlap of 20 cm. All sheets are laid perfectly evenly, and only after that they begin to use fasteners using a screwdriver, which are screwed into wooden sheathing in all waves. For more reliable fastening, rivets are used in overlapping areas.

After installing the first two sheets of the bottom row, begin to attach the first sheet of the second row on the left side. Upper and bottom sheets are attached to each wave (overlapping areas), the intermediate sheets are attached in a different pattern (checkerboard order), this will avoid overuse of fasteners. However, you need to remember that the screws should not be located more than 50 cm from each other, especially if the roof has a serious angle of inclination.

The above material will allow you to find out how many screws are required for corrugated sheeting.

Let's give an example: if we have sheets 8 meters long and 110 cm wide, with a lathing pitch of 50 cm, then 10 fasteners will be used in the lower and upper parts, and another 8 pieces will be used in the middle. It turns out that each sheet will require 18 screws. Now we multiply their number by the number of sheets and get the consumption of corrugated sheet screws for the roof.

Don't forget that sheets can be different sizes, and also that the angle of the roof may be different. The steeper the roof, the tighter the fasteners. In this case, the consumption of self-tapping screws per 1 m2 of corrugated sheet will be increased, but without this there is no way.

In addition to this, on pitched roofs, as well as on front overhangs, roofing material must be attached to each piece of wooden sheathing. This will undoubtedly affect the consumption of self-tapping screws for corrugated roofing sheets.

That is why the concept of “norm of self-tapping screws per 1 m2 of corrugated sheet” is not accurate, because it all depends on the specific cases given above. Yes, these concepts can be averaged, but in this case it will not be possible to make an exact calculation. Self-tapping screws are a consumable item, so order them 10% more.

Calculation of self-tapping screws for profiled sheets on a fence

The number of lags is the main indicator of the future consumption of screws for attaching corrugated sheets. If there are two logs on the fence, then the consumption will be 3 screws for each. With a large number of lags, the number of fastening elements will increase.

The contact areas of the sheets must be secured. If climatic conditions leave much to be desired, then the number of fastening points will need to be significantly increased.

Enough simple formula the calculation will allow you to quickly calculate the consumption: 3 (number of screws per joist) multiplied by the number of joists and the number of sheets. Let's give an example: you have 2 logs and 10 sheets - 3*2*10=60.

Calculation of self-tapping screws for profiled sheets for buildings

In places of overlap, the material is attached in each wave, in any other places - through the wave. The distance between fasteners can be up to 1 meter. It all depends on the specifics of the structure and, of course, climatic conditions. In areas with strong winds, we recommend attaching the material to each wave.

To count total number fasteners, just find out the required number of screws per sheet and multiply by the total amount of profiled material.

If we take the average statistical indicators, then it takes 6-9 pieces per 1 m 2

The roof of any house must be reliable. Firmly protect the building from snow, wind and rain.

Require less energy and funds for its construction. Meet the aesthetic needs of the owner.

That's why many they prefer corrugated sheets(profiled metal sheet), like best option when constructing a roof.

Its advantages:

polymer protection protects it from corrosion;
he is indifferent to climatic surprises;
non-toxic;
resistant to fire;
varied in color and types;
affordable.

Does it method of fastening corrugated sheets with self-tapping screws Another advantage? - Yes, there is nothing complicated about it. The main thing is to know what and how to do.

Technical characteristics of the profiled sheet here.

Requirements for fasteners

The corrugated sheet is fastened to the roof using roofing screws. The large sheet area, metal rigidity and low weight create a load on the fasteners. The stability of the roof during strong gusts of wind also depends on the reliability of the fastening. The type of frame is taken into account: It can be metal or wood.

Self-tapping screws that are attached to a metal surface are made with fine threads and a tip, like a drill. Possessing high strength
, they screw easily into a metal surface without requiring holes.

Self-tapping screws intended for wooden frames are very similar to simple screws, only with a larger head diameter.

Their durable steel can also penetrate corrugated roofing sheets without drilling. Mounting screws come in different heads: cylindrical, hexagonal, semicircular and spherical. The splines also differ. They can be in the form of an asterisk or a cross. Curly or straight. For installation of corrugated roofing, most

Suitable for self-tapping screws with a special sealing gasket made of artificial rubber (EPDM). The contact with the metal surface is so tight that there is no risk of water penetrating through the joint. This is also facilitated by a special protrusion along the edge of the hexagon. It enhances the strength of the head and adds reliability to the seal.

Self-tapping screws for corrugated roofing are easy to choose by color, since they are produced with different decorative coatings, which also have protective properties. The quality of fasteners is indicated by the presence of markings. It is worth choosing self-tapping screws with elastic thickness (2 mm) neoprene gasket You can check the quality yourself: use pliers to squeeze the washer with EPDM and check the integrity of the paint coating. The gasket should not move out of place on the metal washer.

How to correctly calculate the consumption of self-tapping screws per 1 m2 of corrugated sheet for roofing

Features of fastening corrugated sheets

Self-tapping screws are screwed into the part of the sheet that fits tightly to the frame boards. From below and from above in every wave. And from the sides - into the sheathing in increments of 50 cm. So that the sheets fit more tightly in places where they overlap, fastening is done in a checkerboard pattern, through the ridge. For strength, the pieces of corrugated sheets are connected to each other using self-tapping screws 20 mm long.

How to tighten a self-tapping screw correctly

How many self-tapping screws per 1 m2 of corrugated sheet for roofing?

The calculation is done before the start installation work. To secure a square meter of corrugated sheet, 7 - 9 screws are required. This number is multiplied by the number of metal sheets that are prepared to cover the entire roof surface. However, you need to buy with the expectation that the screws may break or be lost.

What kind of lathing is needed for a roofing sheet?

The lathing on which the corrugated sheet is mounted can be metal or wood. It all depends on the purpose of the building. For industrial or utility buildings it is made of metal. The roof slope here is minimal, the load is significant, so the frame must be more stable.

In residential buildings with a steep roof slope, wooden blanks are used under the sheathing. Dimensions for timber - 40 mm by 40. Allowed 50 mm by 50. The thickness and width of the board are 32 mm and 100 mm, respectively. These standards are used for covering with profiled roofing sheets.

Due to the expected load and the angle of the roof, the sheathing has different pitches.

When the roof slope is less than 15 degrees, the sheathing pitch depends on the type of corrugated sheet.

Corrugated sheeting marked C20 requires continuous sheathing. The overlap of adjacent sheets is 20 cm. This is approximately the length of one wave.
Corrugated sheet C35 lay on the frame in increments of 30 cm with the same overlap.
Profplast S44 mounted on the lathing in increments of 50 cm.

An angle of 15 degrees provides step of 30 – 40 cm with minor overlap of 10 - 15 cm.

Fastening the corrugated sheet using self-tapping screws requires that the fastening elements be twice as long as the sheathing board. If the beam is 75 mm wide, then the screw should be 150 mm.

For expected significant loads, the frame is mounted in two layers. The lower sheathing, parallel to the ridge, is done in increments of 50–70 cm.

How to properly attach corrugated roofing sheets to the sheathing

With the right choice of the type of material and fastening elements, installing corrugated sheeting on the roof is not a complicated process. It is important to follow the rules of fastening and installation roofing.

Fastening the corrugated sheet with self-tapping screws to the roof is carried out in the following order:

Before starting work, wooden base processed antiseptic . This will save you in the future wooden frame from destruction and will extend the life of the roof.
The reliability and strength of the roofing surface will depend on the tightness of the metal sheets to the frame. Protecting a building from the influence of moisture, wind, and temperature changes is one of the main functions of the roof.
So, how to attach corrugated sheets to the roof? The metal is attached to the sheathing at the bottom of the corrugation. The overlap of leaves on each other in one row is one or two waves. The rows are connected to each other with an overlap of 1 - 2 cm.
The upper and lower parts of the corrugated sheet are attached to the sheathing in each wave. Fastening the side parts - every other time.
The profiled sheets are joined together using rivets using hand guns. To prevent the self-tapping washer from becoming skewed, It should be screwed strictly vertically to the surface of the sheet. This will ensure a tight fit and seal. The longer the screw, the greater the risk of misalignment.
The connection of the elements of the ridge and the corrugated sheet through its protruding part will create high density fit. If the roof slope is not so gentle, install additional gaskets for compaction, directly below the ridge into the bottom of the wave bend. In case of heavy rain with wind, water will not flow under the ridge. Read also about the installation of additional elements.
To save time on installation and prevent uneven laying of sheets, they are installed in blocks of three or four pieces.
It is important to cut the profiled sheet correctly. It is better to do this with electric scissors. Manual ones will also work. If you need to make cuts along the bias, use a jigsaw.
To prevent the cut areas from corroding, they are treated with an anti-corrosion agent.
The technician must be careful while on the roof not to accidentally damage the surface of the decking. After 2 months, it is necessary to tighten the threads of the self-tapping screws. When installing the roof, the corrugated sheets could move and weaken the fastening.

Corrugated sheet fastening diagram

How to screw in a self-tapping screw correctly

Corrugated sheet consumption per 1 m2 of roofing: coefficient and calculation calculator

Calculation example for a roof of complex shape

Stingrays complex roofs, such as hip and attic, are made in the shape of trapezoids and triangles. Quantity calculation required material begins with a detailed layout of the coating sheets on the drawing. Having specified all overlaps and overhangs, the entire area is determined.

An accurate calculation will make it possible to minimize waste.

The length of the sheet is used as a basis. Depending on the type of corrugated plastic, it varies from 500 mm to 6500 mm. The number of fasteners is calculated as follows: If for one square meter

You need 9 self-tapping screws, then it is enough to multiply 9 by the coverage area.

More complex calculations are best left to specialists.

Useful video

We invite you to watch the video instructions for attaching the corrugated sheet to the sheathing:

Consumption rates for corrugated sheets per 1m2 - how to calculate

Calculation of the number of screws per 1m2 of profiled sheet + video lesson

Fastening corrugated sheets on the roof with self-tapping screws: features and types of fastening hardware

How to properly join corrugated sheeting to the roof

For more than ten years, corrugated sheeting has been used as a material for roofing, construction of fences, cladding of facades and walls. This is not surprising, because profiled sheets have a lot of advantages and disadvantages, including: ease of installation, durability, and aesthetics.

It doesn’t matter for what purpose the material is purchased, but it is important to know what the consumption of corrugated sheeting will be for 1 m2 of roofing, walls, fences, etc. On this moment

There is no uniform consumption rate for corrugated sheets, because the consumption of corrugated sheets per 1 m2 depends on many factors. Only by determining the features and technical characteristics can you accurately calculate the material.

Consumption rates for corrugated roofing

Reliability and tightness are the main indicators of a quality roof. A roof made of corrugated sheets should not allow a single drop of water to pass through. The roof not only protects the attic or attic, but also diverts water away from the facade of the building and the foundation to prevent their destruction. Naturally, in some cases you will need to purchase a little more roofing material, but you can’t do without it. By saving just once on material, by making a minimum overlap or by making a roof that is not long enough, you can incur serious financial losses. Therefore, you should not skimp on profiled sheets and know the rules for their installation.

Vertical installation It is important to know that profiled sheets must overlap one another, i.e. install overlapping. Of course, consumption will increase slightly, but without this you can’t count on quality roofing , serious rain will lead to trouble. that the material should overlap each other from all sides.

How much overlap should there be? You can answer this question by looking at the project of your future or existing roof. Slope is main parameter, on which the material consumption and overlap dimensions depend.

Important! To protect your roof from leaks as much as possible, use roofing sealant.

Eaves overhang

The façade and foundation must also be protected from precipitation; this point must be taken into account and a long enough canopy must be made to prevent rain from falling on the building. To do this, you need to install the profiled sheets a little further than the sheathing.

The size of the visor directly depends on the brand of material used, because they have different strength. If you hang the sheets at a great distance from the wooden sheathing, you may lose your roof. Therefore, it is important to know the brand of the profiled material and, accordingly, its strength.

Also remember that you need to consider whether gutters will be installed to drain water. If you plan to install a gutter, then there is no point in having a large eaves overhang.

Therefore, it is necessary to take into account not only the consumption of corrugated sheets, taking into account the overlap, but also the size of the canopy.

Horizontal installation

To ensure that the joints of the profiled sheets are as reliable as possible and not a drop of water gets into them, it is necessary to properly overlap the material. Therefore, before purchasing sheets, you need to calculate the corrugated sheet consumption per m2 and the number of screws per 1m2.

The size of the overlap of adjacent sheets depends on their brand. And don’t forget that, just like with vertical installation, you need to take into account the slope of the roof.

Gable overhang

The roofing material must extend beyond the sheathing not only in the area of the eaves overhang, but also in other parts. It turns out that the sheets should be longer than the sheathing along the entire perimeter, provided that gutters are not used to drain precipitation.

Front overhangs can be installed in two ways - using a wind board and a wind strip. In both cases, the consumption of corrugated sheeting per 1 m2 of roofing will vary slightly.

Conclusion

To summarize, it should be noted that the consumption rates for corrugated roofing depend on the following points: the type of material used, the method of installation - vertical, horizontal, overhang - eaves, frontal.

Layout of material, indicating key points, will significantly simplify life and save time and eliminate thoughtless expenses.

The consumption rate of profiled sheets can be obtained if the total size of the roof is divided by the size of one sheet. The sheet area can be found out at the time of purchase (sheets different brands have different sizes).

You also need to understand that the useful area of the material will be less than the total, since there will be a large number of overlaps with other sheets.

If we talk about calculating the material that will be used for formwork, installation of walls, cladding, then it will be determined in the above manner. Only in the calculations will only the distance from one sheet to another be taken into account.

Overlap of corrugated sheets on the roof

Metal roofs visually increase the status of the owner and you can’t argue with that. Of course, a lot depends on the material used and installation technology. For example, if there are sheets of tin on the roof, then there is little aesthetic here, but when using the same corrugated sheeting, the picture will change dramatically. Many developers are switching to metal roofs because they are much cheaper than other coatings. In this article, I will tell you what the overlap of corrugated sheets on the roof should be, how to lay it correctly, and I will consider the most suitable brands of corrugated sheets for laying on the roof.

Need for ventilation

As you know from school course metal coating cannot pass moisture through itself, but it can easily condense it.

Due to the lower temperature, the metal perfectly collects moisture on its surface, as a result of which the rafter system collapses much faster than usual. This problem can be solved with the help of ventilation ducts. First part natural ventilation should be located after the roofing pie, or more precisely between the insulation and the coating. Typically, to create air gap a counter lath is created. This roof design not only contributes quick elimination

humid air, but also strengthens the entire system. Since sheet metal is not a heavy coating, it is not worth creating a very sophisticated sheathing, otherwise it will affect the final cost of the object.

The second ventilation duct should be located in the roofing pie itself. This is justified by the fact that if water does get on the insulation boards, they will dry naturally. To create an air gap, small slats are laid on top of the thermal insulation; they raise the vapor barrier layer, thereby creating another passage for ventilation.

If you are wondering: “Where does condensation come from?”, then now I will explain everything to you. When working, the human body releases liquid into the air. As good example You could include playing sports or cooking. The air is humidified even during passive rest, when we simply breathe. The warmed moisture rises to the interfloor ceiling and, due to the condensation process, settles on the colder side, i.e. in the attic. The same thing happens there.

Marking of corrugated roofing sheets

If you didn’t know, corrugated sheeting is a universal building material. It can be used not only as a covering, but also to create formwork from it, interfloor ceilings, build fences and much more.

Let's look at the types of corrugated sheets often used in the roofing industry.

From 8. This sheet corrugated sheet differs in its configuration from all others. The height of its corrugation is only 8 millimeters. The waves are repeated in increments of 80 millimeters. Due to such a large distance, the width of the material flange is 10 times greater than the height of the corrugation. From this we can conclude that the material does not have very high rigidity and for its installation it will be necessary to construct the lathing in increments of a maximum of 60 centimeters. As a rule, such corrugated sheets are produced with a polymer coating. The colors of metal products are quite varied, so there is plenty to choose from. If we consider foreign materials, then an identical profiled sheet can be found under the marking T6 or T8.
From 10. As you understand from the numbers, this material is slightly different from the previous one. Despite its small corrugation height, it has an acceptable load-bearing capacity. The maximum lathing pitch can be 80 centimeters.
From 18. This brand of corrugated sheet is very similar to the Finnish product called RAN. Here you can see wide shelves reinforced with a stiffener. This eliminates the possibility of the material knocking during strong gusts of wind. It has a good aesthetic appearance, which makes it more popular.

From 21. The height of the corrugation is not high, however, the resistance to mechanical loads is at the proper level. The material achieved this through their frequent and symmetrical arrangement. The metal sheet has a convenient joining of the outer corrugations and due to this, the ease of installation increases.
N 57. This product has gained the greatest popularity and no wonder, because it contains the most optimal dimensions, load bearing capacity and price.
N 60. This material has a dual purpose and can be used both as a roofing covering and as a base for soft roofs. Such sheets come on sale in the form of rolled steel with a width of 1250 millimeters. As for the length, it can reach 12 meters.
NS 35. The galvanized base is reinforced with additional stiffening ribs. Due to this, the maximum lathing pitch can be 1.5 meters. Polymer paint is used as a protective coating.

N 114. To date, this variety is the most durable of all known. Such a sheet of metal has maximum height corrugations and reinforced stiffening ribs located in increments of 80 millimeters. The thickness of the profiled sheet reaches 1.1 millimeters. Available for sale from 2 to 12 meters in length. The product is coated with polymers on top and paint on the bottom.

Installation process

If you are asking the question “what pitch of sheets for a corrugated roof is optimal?”, then everything is simple here. The pitch of the sheets will primarily depend on their width; as a rule, it is the same for all roofing varieties and amounts to 1250 millimeters. Next, you need to deal with the slope of the slope itself. If the roof is flat, then the pitch will be smaller, if it is steep, then larger.

By reducing the distance between the axes of the sheets, you increase the overlap. The larger it is, the more difficult it will be for moisture to penetrate roofing pie. Of course, there are some nuances here. If you overlap more than 20 centimeters, it will not lead to anything good. After all, the useful area of the sheet will decrease many times, and the weight of the roofing sheet will increase.

The consumption of corrugated sheets per 1 m2 of roofing is determined individually and there is an explanation for this. Most developers try to cover the length of the roof slope with one sheet. This is correct, this way you will reduce the number of seams, which will make the surface more airtight.

Installation of profiled metal sheets takes place according to the following scenario:

All work begins with the preparation stage. If you are working with laying corrugated sheets in wet weather, then it is very important to choose good shoes with non-slip soles and wear a mounting belt. The fact is that it is very easy to slip on a wet metal surface.
Next comes the fastening of the corrugated sheeting to the sheathing. It is best to use special screws as fasteners. They are equipped with a special rubber lining, which makes the hole more airtight.
Since the sheet of metal will cover the entire length of the slope, the installation process can begin from any side of the roof.
First, the first sheet is mounted. It is positioned in such a way that satisfactory overhangs remain at the bottom and sides, and only then is it screwed to the base. The fastening elements should be located at the bottom of the wave so that the joining occurs as tightly as possible.
The second sheet lies on the first with the necessary overlap. To fasten the profiled sheets together, self-tapping screws are placed at the crest of the wave.
In this way, the entire surface of the roof is covered, and at the end additional elements are installed.

Although corrugated sheets have a protective coating, it deteriorates over time. In some regions of the country this process is much faster. To solve this problem, you can use ordinary paint.

During the operation of this roof, a situation may arise when sharp gusts of wind create some noise. The reason most likely will lie in the fasteners. During preventive inspections, pay attention to each self-tapping screw, because one loose rubber band can cause noise.

Additional elements

All kinds of parts can be installed on the roof as additional elements. For example, ventilated ridge, wind strips, overhang fillers.

Since on metal roof a lot of moisture will accumulate, then a ventilated ridge will not be out of place here. It differs from the ordinary one by the presence of perforation. By blocking access to birds and small rodents, it allows moist air to escape attic space on one's own.

Eaves fillers are very convenient thing, if you need to protect lumber from pests, but you want to leave passages for natural ventilation, then this The best decision for you.

Consumption rates for corrugated sheets - what needs to be taken into account when calculating?

Corrugated sheeting is traditionally used as roofing, as well as for cladding facades and making wall structures. Great popularity in last years I purchased profiled sheets as a material for the construction of various fences.

But no matter what purpose you plan to use a profiled sheet, you always need to know what the consumption of corrugated sheeting will be per 1 m2 of roof, facade or fence area.

In construction there is no generally accepted fixed rate of consumption of corrugated sheets. The consumption of corrugated sheets per 1 m2 depends on many different factors. Consumption rates for corrugated sheets are determined during design separately for each structure, taking into account its individual characteristics and technical characteristics.

Consumption rates for corrugated sheets when installing roofing

The most important characteristic of any roofing is its tightness. Water should not enter the under-roof space either during the heaviest rainfalls or snowfalls, or during the spring melting of snow.

But the roofing covering protects not only the attic or attic; the corrugated sheeting must be installed so that a minimum amount of rainwater falls on the façade of the building. Therefore, when installing corrugated sheets, several basic rules must be followed.

Vertical overlap

First of all, it should be taken into account that when laying on the roof, the profiled sheets must overlap each other. Moreover, the overlap is performed both between adjacent sheets and between the upper and lower rows of corrugated sheets. Depending on the amount of overlap, the rate of consumption of corrugated sheeting on the roof also changes.

The size of the overlap between the rows of profiled sheets depends on the slope of the roof. The smaller the angle of inclination, the more the profile of the top row should overlap the bottom sheet.

Eaves overhang

In addition, to protect outer wall building, the roofing should form a kind of canopy that prevents water flowing from the roof from reaching the facade of the house. To do this, the profiled sheet is extended beyond the roof sheathing by the amount of the eaves overhang.

In the area of the eaves, significant wind loads act on the corrugated roofing, tending to tear the roofing off the sheathing. Therefore, the size of the eaves overhang directly depends on the strength, and, consequently, the height of the wave or trapezoid of the profiled sheet.

The size of the eaves overhang depends on whether it is planned to install gutters along the edge of the roof to drain water flowing from the roof.

From the above it follows that the size of the eaves also significantly affects the consumption of corrugated sheets per 1 m2 of roofing.

Horizontal overlap

The next thing that needs to be taken into account when calculating the consumption of corrugated sheets when installing a roof is the amount of overlap between adjacent sheets of corrugated sheets in the same row.

It is necessary to ensure that drops of water cannot penetrate under the roof at the joints of the corrugated sheeting. The amount of overlap between adjacent sheets also depends on the height of the profile.

Gable overhang

The roof covering should protrude beyond the building's footprint not only in the eaves area, but also on the gables of the building. This protrusion is called a gable overhang. Most often, two device options are used gable overhang- with the installation of a wind board or a special wind strip. At the same time, the consumption of corrugated sheets on the roof is different in both cases.

From all that has been said above, we can conclude that when calculating the consumption rate of corrugated sheets for the roof, you need to take into account:

the amount of vertical overlap;
the amount of horizontal overlap;
gable overhang size;
eaves overhang size.

The easiest way to do this is by drawing a diagram of the layout of corrugated sheets, taking into account all the characteristics of a particular roof.

If we divide the coverage area calculated according to the diagram by the area of one sheet of corrugated sheeting, we will get the consumption rate of corrugated sheets per 1 m2 of roofing. The sheet area can be found out from the corrugated sheet seller, and it will vary depending on the brand and height of the corrugation or wave of the profiled sheet.

At the same time, it is necessary to pay attention to the fact that technical specifications profiles usually give the value of the total and usable area of the sheet. Effective area always somewhat less, since it takes into account the size of the overlap between adjacent sheets of corrugated sheets in the same row.

If you also plan to use corrugated sheeting when cladding a façade or constructing a fence, the consumption per m2 is determined according to the same principle. The only difference is that when calculating profile consumption for vertical surfaces, only the overlap between the sheets of corrugated sheets needs to be taken into account. At the same time, for vertical installation of corrugated sheeting, the overlap between the rows of the profile can be 2 times less.

When ordering materials for roofing, facade or fence, it is best to immediately purchase special fasteners for corrugated sheets, the consumption of which is approximately 6-8 pieces per 1 m2 of surface.

How to correctly calculate corrugated roofing

Corrugated sheeting is a cold-rolled galvanized corrugated sheet of steel. All those who have decided to build the roof of their house on their own need to know how to calculate corrugated sheeting for a roof.

The advantages of corrugated sheeting include low cost, light weight, ease of construction, and durability.

Consumers appreciated the positive qualities of this material.

Profiled sheeting enjoys undiminished popularity.

Its advantages include:

low cost;
light weight (due to this, installation requires little labor);
ease of construction;
high performance;
durability.

Modern corrugated sheeting is a material with several protective coatings. These layers are represented by polymer plastic compounds. Due to them, the service life of the profiled sheet is significantly increased. He is not afraid of adverse natural and atmospheric influences. Thermal, hydro, and sound insulation characteristics are improved. There is an increase in decorative properties.

A little about corrugated sheets

By studying the standard markings of metal slates, you can learn a lot about corrugated sheets. In particular, the marking data includes the area of application of the corrugated sheet, wave height, which determines the load capacity of the section.

There are three main types of material:

Wall (C). The wave size varies from 8 to 21 mm. This profiled sheet is used as a wall facing material for non-residential frame objects (warehouses, sheds, garages). Fences and fences are built from similar corrugated sheets.
Universal (NS). This type has additional stiffening ribs. Walls are lined with this material; they can be structural elements. The height of the corrugations is 20-60 mm.
Bearing (N). This type is distinguished by increased rigidity, due to which such segments can be used as components of building frames. It is also made from permanent formwork walls and ceilings during concrete works. The wave has a height of 57-115 mm.

About the size of waves on metal profile sections

As practice shows, roofing are carried out using profiled sheets in which the wave height starts from 3.5 cm (grade NS35 and higher). Large permanent roofs are made from N grade profiled sheets. In individual housing construction, grades NS35-44 are used. A high corrugation height is desirable where there is heavy snow and strong winds.

Options for sheet metal sheeting.

The width of profiled sheets can be general and useful. The second values are taken into account when the vertical overlap of sheets is calculated. This indicates the width of a single metallographic wave. On modern profile sections, the outer waves have a special shape, making it much more convenient to cover the roof of the house.

For example, if a corrugated sheet is marked NS44-1000, then the width of the corrugated sheet is 1000.

Metal profile sheets vary in thickness from 0.36 to 1.2 mm. Its value determines the strength and load-bearing characteristics of the material. Based on these data, the mass is calculated, as well as the cost of one section. Therefore, these values must be taken into account when choosing a material. Sheets that are thinner than 0.45 mm belong to the economy class. For roofing, the sheet thickness should vary between 0.45-0.5 mm.

What should be the angle of inclination of metal slate roofs?

This parameter is extremely important when calculating the force triangle. Sloping low roofs are mainly pressed by the snow on them. If the slope exceeds 60º, then the snow does not have any effect on the roof. When the angle is in the range of 25-60º, snow load calculated as 70% of the maximum values. For more steep roof There are significant wind loads. If the roof steepness increases from 15 to 60º, then the strength of the gusts increases 5 times. Metal slate roofs, the angle of which starts at 45º, have low retention properties for snow.

Single and gable roofs

Scheme of installation of corrugated sheeting on the roof.

If the house has a pitched roof on top, then the entire amount of loads falls exclusively on the rafter system (unlike gable options, where the loads are distributed over both rafter rows). The latter must reliably counteract them. Therefore, traditionally a lean-to rafter system is not very powerful. Similar types of roofs are erected with a slight angle of inclination to one side (usually no more than 30º).

The gable roof type is available in several configurations:

symmetrical/asymmetrical. Here the angles of inclination may differ, the skates may move along to different parties from the center;
multi-level or those with longitudinal lights;
half-hip;
broken attic.

Houses with gable roofs usually have attics or attic rooms. To obtain an acceptable height, their slopes can be tilted up to 60º. In this case, it is necessary to strengthen rafter system to compensate for wind loads. As evidenced by many years of construction experience, the effects of wind and load are not terrible if a simple gable roof has an angle of inclination, the value of which is in the range from 35 to 50º. This is the norm for roofs of this configuration.

Calculation of the required number of metal slate sheets for the roof

Corrugated sheeting consumption table for roofing.

L = W/cos (arctg (H/W)) + S1 + S2 + 4 cm,

where: H is the height of the ridge from the roofing;

S1 and S2 - the length of the overhangs on both sides. Typically this size varies from 20 to 50 cm.

The required value (L) is divided by the length of one corrugated sheet. The result is rounded up. In this way, you can obtain a preliminary number of horizontal rows of roofing.

The roofing material is laid with an overlap, the size of which depends on the angle of inclination. So, if its value is less than 15º, then the width of the overlap reaches 20 cm. When the angle of inclination approaches 30º, the total sector is reduced to 15 cm. At a larger angle, the width of the overlap becomes 10 cm.

Corrugated sheet fastening diagram.

When determining the total length of corrugated sheet used for a vertical row, horizontal overlaps must be taken into account:

Lo = (R ─ 1) * 2 * P + R * Wm,

where R is the total number of horizontal metal profile rows;

P - overlap width;

Wm is the width of one corrugated sheet.

When the result obtained is greater than the total length of the corrugated sections obtained in the preliminary calculation, then another shortened row is added. After this you will have to count everything again. Reducing the row height by increasing the overlap is undesirable, since total weight roofing material per 1m2 will increase significantly. Vertical rows are calculated in a similar way.

Calculation of material consumption for a gable symmetrical roof is carried out according to the same scheme for each half. Here the coefficient W is taken to be two times smaller. To calculate a more complex configuration, it is necessary to divide the roof into its component sections. Such fragments can be triangles or trapezoids. When using special computer programs the calculation is greatly simplified.

It is necessary to calculate additional elements ─ ridges, pediments, valleys (roof elements that have internal corner necessary to connect two adjacent slopes), snow retainers, plugs. The need for the presence of each node is determined by a specific project.

Instead of a conclusion

Summarizing everything said above, we can state the following: in order for the constructed housing to be cozy and warm, you need to correctly calculate the roof. Under such a roof, the inhabitants of the house can live comfortably and happily.

A competently and efficiently constructed roof made of metal slate sheets does not require special care and maintenance. Operational life This material is well over 50 years old.

Construction plasterboard structures begins with the design and calculation of the quantity of purchased material. It’s easy to find out the number of profiles and gypsum boards, but determining how many fasteners will be required is more difficult. Let's find out how to count the number of screws per sheet of drywall.

What kind of screws are used when installing gypsum boards?

To fasten drywall to the frame, screws of different lengths are used:

25 mm – when installing plasterboard in one layer;
35 mm – with two layers of sheathing.

The type of screws is selected based on the frame material:

the cladding is attached to the profile with metal screws;
to the beam - on wood.

It is easy to distinguish them: hardware intended for working with metal have more frequent threads.

You should not use one type of screws instead of another: this will certainly affect the strength of the fastening.

The design of the fastener ensures convenience and quality of work:

Hardware is protected from corrosion by a special coating that gives it a black color.
The pointed spiral of the thread ensures easy penetration of the self-tapping screw into the metal profile and reliably holds it there in the future.
The conical head is recessed into the material and does not interfere with subsequent finishing.
The deep cross-shaped slot on it allows you to screw in a self-tapping screw with a regular screwdriver or screwdriver.

When using a screwdriver, you need to act carefully: there is a high risk of sinking the screw too deep and damaging the material. Makes work easier: due to its design, it limits the depth of screwing in the hardware.

Professionals use . They make the process of installing drywall sheets much easier and faster. But the cost of such a tool is high, so there is no point in purchasing it for a single repair.

Before calculating how many self-tapping screws will be needed for a structure, it is logical to familiarize yourself with the norms and rules for their placement. The following nuances are taken into account:

The distance between adjacent screws must be more than 10 cm, otherwise the plaster of the sheet will begin to crumble when screwed in.
When leveling walls or installing partitions, a step of 25–35 cm is taken between the attachment points. It is reduced to 15–20 cm if in the future it is planned to cover the surface with heavy material, such as ceramic tiles.

HELPFUL INFORMATION: Is drywall harmful? Composition and environmental friendliness of the material

More hardware is used for the ceiling sheathing, since they are attached more often: the step is 15–20 cm. The rule works here: the thicker and heavier the drywall, the smaller the distance between the attachment points.
When installing in two layers, the first one is attached less frequently - every 45–60 cm. The screws that secure the second layer are 10 cm longer. When screwed in, they additionally secure the first one. This reduces the consumption of hardware and eliminates unnecessary costs.
The number of required attachment points increases when constructing curved structures. Here the pitch between the screws is chosen so as to fix the desired surface shape.

Calculation of the number of screws

It is produced according to the frame diagram drawn up. It is clear that the number and dimensions of the guides, as well as the jumpers between them, will be individual for each case. General recommendations the following:

For walls, the distance between the guides is 40 or 60 cm. This step allows you to place the joints of the sheets on the surface of the profile.

The number of horizontal jumpers depends on the dimensions of the room (one sheet of drywall is often not enough in height), as well as on the requirements for structural rigidity (mandatory when constructing partitions, but can be neglected when leveling walls).
For ceiling structures, frames are constructed in the form of cells with dimensions of 40 × 40, 40 × 60 or 60 × 60 cm. This structure ensures a minimum of trimmings and joining of elements on the profile.

11 self-tapping screws for each rack (the sheet is positioned vertically, its length is 2,500 mm, the fastening pitch is 25 mm).
For 4 racks – 44 screws.
Plus 6 - for fastening to the upper and lower horizontal jumpers (three for each - just place one self-tapping screw between adjacent vertical posts).
In total, 50 pieces will be needed per sheet.

Consumption of self-tapping screws per 1 m2

Table of fastener consumption for wall cladding in one layer according to the Knauf system (C 623.1):

For two-layer wall cladding (C 623.2):

For a partition with plasterboard fastening in one layer (C 111):

For a partition with two-layer cladding (C 112):

For suspended ceiling:

Online calculator for self-tapping screws on a sheet of drywall

In order not to do manual calculations or test yourself, it is convenient to use our calculator, which calculates using the Knauf formula.

Drywall - popular finishing material, characterized by versatility and environmental friendliness. In addition, it is absolutely non-toxic and does not conduct electricity. Its installation is not complicated and does not require serious financial costs, and the result is stunning.

As is known, any repair and subsequent Finishing work lead to significant financial costs, so it is especially disappointing if purchased materials remain unused and turn out to be superfluous. Therefore, when purchasing them, everyone tries to calculate the required quantity as accurately as possible, so as not to overpay. But while this can be done easily with large elements, determining the number of, for example, self-tapping screws for fastening drywall sheets will not be possible so quickly. There are many nuances here.

What kind of screws are used when installing gypsum boards?

Self-tapping screws are reliable and inexpensive fastening devices made from brass or stainless steel. These hardware differ in thread, coating, purpose and tip shape. Anyone who has decided to renovate a house using gypsum boards wonders how many self-tapping screws are needed per 1 m2 of drywall. There is no definite answer to this question, since their number is calculated depending on the step of attaching the gypsum board to the wooden or metal profile.

Most often, metal tiles are used as a finishing material in roof construction. But during installation, not only the features of its installation are taken into account, but also the location and number of screws for metal tiles.

This roofing material is very popular in Russia today. This is primarily due to the fact that metal tiles have such qualities as strength, low price and ease of installation.

The metal tiles are fastened to the sheathing using special self-tapping screws. They have a special structure.

At the end they look like a drill that can easily pierce metal. A special washer located near the head ensures a tight fit of the fastener. You need to know the order of the screws to use the required amount of material and more. And in order not to spend extra money on fasteners, you should know exactly in what order and quantity they are screwed into the profiled steel sheet. In addition, it is worth noting that in Don't make extra holes. So how many self-tapping screws should you use per sheet of metal tile? To answer this question, you first need to choose high-quality fastening materials.

In this article

Material

High-quality screws for metal tiles should not only quickly pierce the sheet, but also be securely fixed in the wood.

As you know, this fastener is made of metal, which is susceptible to the negative effects of corrosion. To avoid the development of these processes, the material is coated with additional protective coating. Most often zinc is used for this. This element promotes reliable metal adhesion.

Modern manufacturers produce fasteners in a huge range of colors, so you don’t have to worry about them standing out on the surface of the roofing material. Some manufacturers immediately supply complete finishing coating hardware of the corresponding shade. Often such a product is considered high quality.

For a tight connection, the screws are provided with a small polymer gasket. It is located under the hardware cap. The lifespan of the roof depends on this gasket, so it is better to give preference to a quality product. Gaskets are known to be of poor quality under negative impact environment are destroyed over time. Moisture penetrates into the resulting gaps, which triggers the process of metal corrosion and wood rotting.

If the purchased metal tile did not come with a set of fasteners, they must be purchased separately. In this case, you should pay attention to the presence of markings on the cap. If it is missing, then this indicates low quality of the material.

Such fasteners are made of high carbon steel. Manufacturers provide a guarantee of 50 years of service. You can check them for the quality of the protective layer. To do this, you need to deform the cap with pliers. The galvanized layer should not peel off.

Exist various sizes hardware.

4.8 x 35 mm or 4.8 x 20 mm are used for mounting on wooden sheathing. Roofing screws 4.8 x 20 mm are used for fastening sheets of metal to each other in places with complex geometric roof shapes. Together, where it is necessary to achieve particularly reliable fastening, self-tapping screws 5 and 7 cm long are used.

Calculation of self-tapping screws

When designing a future roof, you should pay attention to every little detail, including the consumption of screws. If fasteners are used frequently, there is a high probability of leakage in the future. If you use a minimum of hardware, then the metal tiles will vibrate when there are gusts of wind, and this will lead to rapid destruction of the roof.

For correct calculation the required number of screws you need to know 2 parameters:

Density of fasteners per 1m2;
Roof area.

Sheets of metal are attached to the sheathing. In this case, the hardware passes at the bottom of the wave, which rests on the wood. Experienced builders know that under no circumstances should the fasteners be passed along the top of the wave. Fastening of metal tiles in the area of the ridge and the outer part of the roof should occur in each wave.

At intermediate stages, hardware must be placed through the wave. In places of overlap, the interval between fastenings should be 1 meter along the sheathing. With an average sheathing pitch of 50 cm per 1m2, you need to use 7 screws.

Remember that this calculation is approximate and is only acceptable for a simple roof. Designs with complex configuration involves the use more fasteners.

Bottom line

Remember, properly secured finishing material can last for a long time. The required number of fasteners should be used. They will ensure reliable fixation of the metal tiles.